diff --git a/cpu/esp32/Kconfig b/cpu/esp32/Kconfig
index 3ba9e075a928..0fbbc4e863d0 100644
--- a/cpu/esp32/Kconfig
+++ b/cpu/esp32/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU
     default "esp32" if HAS_CPU_ESP32
diff --git a/cpu/esp32/Kconfig.common b/cpu/esp32/Kconfig.common
index db0e159f5546..cf177789a36a 100644
--- a/cpu/esp32/Kconfig.common
+++ b/cpu/esp32/Kconfig.common
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 if HAS_ARCH_ESP32
 
diff --git a/cpu/esp32/Kconfig.esp32 b/cpu/esp32/Kconfig.esp32
index 9be5e3b88211..21d8217d40f6 100644
--- a/cpu/esp32/Kconfig.esp32
+++ b/cpu/esp32/Kconfig.esp32
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32
     bool
diff --git a/cpu/esp32/Kconfig.esp32c3 b/cpu/esp32/Kconfig.esp32c3
index 89f1bdbb108f..0c180865b081 100644
--- a/cpu/esp32/Kconfig.esp32c3
+++ b/cpu/esp32/Kconfig.esp32c3
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32C3
     bool
diff --git a/cpu/esp32/Kconfig.esp32c6 b/cpu/esp32/Kconfig.esp32c6
index 4a8d2b3cf1d2..ce922398a5b0 100644
--- a/cpu/esp32/Kconfig.esp32c6
+++ b/cpu/esp32/Kconfig.esp32c6
@@ -1,8 +1,5 @@
-# Copyright (c) 2025 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2025 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32C6
     bool
diff --git a/cpu/esp32/Kconfig.esp32h2 b/cpu/esp32/Kconfig.esp32h2
index 68ebf779bf9d..8c0448c95e2c 100644
--- a/cpu/esp32/Kconfig.esp32h2
+++ b/cpu/esp32/Kconfig.esp32h2
@@ -1,8 +1,5 @@
-# Copyright (c) 2025 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2025 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32H2
     bool
diff --git a/cpu/esp32/Kconfig.esp32s2 b/cpu/esp32/Kconfig.esp32s2
index a91ef7bb3965..ee12deef6e27 100644
--- a/cpu/esp32/Kconfig.esp32s2
+++ b/cpu/esp32/Kconfig.esp32s2
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32S2
     bool
diff --git a/cpu/esp32/Kconfig.esp32s3 b/cpu/esp32/Kconfig.esp32s3
index 149953c7fd3d..6ce6973e389e 100644
--- a/cpu/esp32/Kconfig.esp32s3
+++ b/cpu/esp32/Kconfig.esp32s3
@@ -1,9 +1,6 @@
-# Copyright (c) 2020 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_FAM_ESP32S3
     bool
diff --git a/cpu/esp32/Kconfig.esp32x b/cpu/esp32/Kconfig.esp32x
index f336d9c5467c..d56d63bcaf9a 100644
--- a/cpu/esp32/Kconfig.esp32x
+++ b/cpu/esp32/Kconfig.esp32x
@@ -1,8 +1,5 @@
-# Copyright (c) 2023 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2023 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 # define a CPU configurationthat common is common for all ESP32x SoC variants
 
diff --git a/cpu/esp32/bootloader/sdkconfig.h b/cpu/esp32/bootloader/sdkconfig.h
index 31674cea9463..a22d3cbc6b63 100644
--- a/cpu/esp32/bootloader/sdkconfig.h
+++ b/cpu/esp32/bootloader/sdkconfig.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2021 iosabi
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 iosabi
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_common.h b/cpu/esp32/bootloader/sdkconfig_default_common.h
index 7abc18945ee6..dd7c9149e3d8 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_common.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32.h b/cpu/esp32/bootloader/sdkconfig_default_esp32.h
index cfda5ff06fad..798591e7d94d 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h b/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
index 4224be7bc628..9fc68ff20c2f 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h b/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
index ca6dd99e2908..6ae8f8ff969d 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h b/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
index 96d369011bef..f129f24cd405 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h b/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
index baabd7185a94..5f13dc150653 100644
--- a/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
+++ b/cpu/esp32/bootloader/sdkconfig_default_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/bootloader/stub.c b/cpu/esp32/bootloader/stub.c
index f7d6b2c6cbf5..987a72eda4c4 100644
--- a/cpu/esp32/bootloader/stub.c
+++ b/cpu/esp32/bootloader/stub.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #define PTHREAD_CANCEL_DISABLE 1
diff --git a/cpu/esp32/doc.md b/cpu/esp32/doc.md
index 0d76de1e1180..86d2323885e1 100644
--- a/cpu/esp32/doc.md
+++ b/cpu/esp32/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup     stdio_usb_serial_jtag  STDIO over ESP32 Debug Serial/JTAG
diff --git a/cpu/esp32/doc_esp32.doc.md b/cpu/esp32/doc_esp32.doc.md
index 898c2f3de412..a85aaba08eb2 100644
--- a/cpu/esp32/doc_esp32.doc.md
+++ b/cpu/esp32/doc_esp32.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32 ESP32 family
diff --git a/cpu/esp32/doc_esp32c3.doc.md b/cpu/esp32/doc_esp32c3.doc.md
index 134f74ea3dbe..88586de82776 100644
--- a/cpu/esp32/doc_esp32c3.doc.md
+++ b/cpu/esp32/doc_esp32c3.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32c3 ESP32-C3 family
diff --git a/cpu/esp32/doc_esp32c6.doc.md b/cpu/esp32/doc_esp32c6.doc.md
index 97f899c5073c..f16bee89e2ab 100644
--- a/cpu/esp32/doc_esp32c6.doc.md
+++ b/cpu/esp32/doc_esp32c6.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32c6 ESP32-C6 family
diff --git a/cpu/esp32/doc_esp32h2.doc.md b/cpu/esp32/doc_esp32h2.doc.md
index d163c11d4252..376025514adf 100644
--- a/cpu/esp32/doc_esp32h2.doc.md
+++ b/cpu/esp32/doc_esp32h2.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32h2 ESP32-H2 family
diff --git a/cpu/esp32/doc_esp32s2.doc.md b/cpu/esp32/doc_esp32s2.doc.md
index f2b381ddcb2f..2583ee8a8471 100644
--- a/cpu/esp32/doc_esp32s2.doc.md
+++ b/cpu/esp32/doc_esp32s2.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32s2 ESP32-S2 family
diff --git a/cpu/esp32/doc_esp32s3.doc.md b/cpu/esp32/doc_esp32s3.doc.md
index 341910559348..ea78085fa524 100644
--- a/cpu/esp32/doc_esp32s3.doc.md
+++ b/cpu/esp32/doc_esp32s3.doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp32_esp32s3 ESP32-S3 family
diff --git a/cpu/esp32/esp-ble-nimble/doc.md b/cpu/esp32/esp-ble-nimble/doc.md
index e53dc1316bcd..137e684168a4 100644
--- a/cpu/esp32/esp-ble-nimble/doc.md
+++ b/cpu/esp32/esp-ble-nimble/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2022 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2022 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup       cpu_esp32_esp_ble_nimble ESP32 Bluetooth LE HCI for NimBLE host
diff --git a/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c b/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
index 510b816b540b..8da4bf4cee40 100644
--- a/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
+++ b/cpu/esp32/esp-ble-nimble/esp_ble_nimble.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-eth/doc.md b/cpu/esp32/esp-eth/doc.md
index 33cbf24ea5f4..65020acf6b27 100644
--- a/cpu/esp32/esp-eth/doc.md
+++ b/cpu/esp32/esp-eth/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup       cpu_esp32_esp_eth ESP32 Ethernet netdev interface
diff --git a/cpu/esp32/esp-eth/esp_eth_netdev.c b/cpu/esp32/esp-eth/esp_eth_netdev.c
index 85d3e82d4ef7..946693324afc 100644
--- a/cpu/esp32/esp-eth/esp_eth_netdev.c
+++ b/cpu/esp32/esp-eth/esp_eth_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-eth/esp_eth_netdev.h b/cpu/esp32/esp-eth/esp_eth_netdev.h
index ea7ae0dde6f1..eceb1bbdbaa2 100644
--- a/cpu/esp32/esp-eth/esp_eth_netdev.h
+++ b/cpu/esp32/esp-eth/esp_eth_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-eth/esp_eth_params.h b/cpu/esp32/esp-eth/esp_eth_params.h
index df2c0ac87e9b..8d55437019e5 100644
--- a/cpu/esp32/esp-eth/esp_eth_params.h
+++ b/cpu/esp32/esp-eth/esp_eth_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-idf/esp_idf_support.c b/cpu/esp32/esp-idf/esp_idf_support.c
index 289c9c53ee28..83c0a3651d17 100644
--- a/cpu/esp32/esp-idf/esp_idf_support.c
+++ b/cpu/esp32/esp-idf/esp_idf_support.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-idf/include/log/esp_log.h b/cpu/esp32/esp-idf/include/log/esp_log.h
index dd00ca354362..e0135b527cdd 100644
--- a/cpu/esp32/esp-idf/include/log/esp_log.h
+++ b/cpu/esp32/esp-idf/include/log/esp_log.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-idf/wpa_supplicant/Kconfig b/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
index 365ff86cecad..3be4a62dfab9 100644
--- a/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
+++ b/cpu/esp32/esp-idf/wpa_supplicant/Kconfig
@@ -1,10 +1,6 @@
-# Copyright (c) 2021 HAW Hamburg
-#               2022 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2021 HAW Hamburg
+# SPDX-FileCopyrightText: 2022 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 rsource "esp_supplicant/Kconfig"
 rsource "port/Kconfig"
diff --git a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
index 8754fa62b5fd..18ab82c01f49 100644
--- a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
+++ b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include "esp_ieee802154.h"
diff --git a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
index 23c6d1a9e115..9e4368fa443e 100644
--- a/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
+++ b/cpu/esp32/esp-ieee802154/esp_ieee802154_hal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/esp-lcd/Kconfig b/cpu/esp32/esp-lcd/Kconfig
index a767fcc66544..aedba950398a 100644
--- a/cpu/esp32/esp-lcd/Kconfig
+++ b/cpu/esp32/esp-lcd/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2023 Gunar Schorcht
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2023 Gunar Schorcht
+# SPDX-License-Identifier: LGPL-2.1-only
 
 if USEMODULE_ESP_LCD
 
diff --git a/cpu/esp32/esp-lcd/esp_lcd_gpio.c b/cpu/esp32/esp-lcd/esp_lcd_gpio.c
index 12f2dcd51bd1..5b71147061af 100644
--- a/cpu/esp32/esp-lcd/esp_lcd_gpio.c
+++ b/cpu/esp32/esp-lcd/esp_lcd_gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp-lcd/esp_lcd_mcu.c b/cpu/esp32/esp-lcd/esp_lcd_mcu.c
index ee0a53d7fbbd..86a8f4e56e2d 100644
--- a/cpu/esp32/esp-lcd/esp_lcd_mcu.c
+++ b/cpu/esp32/esp-lcd/esp_lcd_mcu.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/esp_ztimer.c b/cpu/esp32/esp_ztimer.c
index 5187fc3d8ea7..da0c5b5e64ce 100644
--- a/cpu/esp32/esp_ztimer.c
+++ b/cpu/esp32/esp_ztimer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/include/adc_arch.h b/cpu/esp32/include/adc_arch.h
index 20da6acecf6f..6073cc066741 100644
--- a/cpu/esp32/include/adc_arch.h
+++ b/cpu/esp32/include/adc_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/adc_arch_private.h b/cpu/esp32/include/adc_arch_private.h
index d20f1c7417fe..4dc01bd80a0e 100644
--- a/cpu/esp32/include/adc_arch_private.h
+++ b/cpu/esp32/include/adc_arch_private.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/can_esp.h b/cpu/esp32/include/can_esp.h
index f4941bdae2ca..72dbb0a438bb 100644
--- a/cpu/esp32/include/can_esp.h
+++ b/cpu/esp32/include/can_esp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/can_params.h b/cpu/esp32/include/can_params.h
index e2ede246c79c..e19469def409 100644
--- a/cpu/esp32/include/can_params.h
+++ b/cpu/esp32/include/can_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf.h b/cpu/esp32/include/cpu_conf.h
index 1e92c776dc62..4dd1ceefa418 100644
--- a/cpu/esp32/include/cpu_conf.h
+++ b/cpu/esp32/include/cpu_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32.h b/cpu/esp32/include/cpu_conf_esp32.h
index d34bcd35b0ee..7a72b8cc8b2a 100644
--- a/cpu/esp32/include/cpu_conf_esp32.h
+++ b/cpu/esp32/include/cpu_conf_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32c3.h b/cpu/esp32/include/cpu_conf_esp32c3.h
index 65b8b3933f14..b6a6ce9b398a 100644
--- a/cpu/esp32/include/cpu_conf_esp32c3.h
+++ b/cpu/esp32/include/cpu_conf_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32h2.h b/cpu/esp32/include/cpu_conf_esp32h2.h
index e32a72f55132..78c356a4e8fa 100644
--- a/cpu/esp32/include/cpu_conf_esp32h2.h
+++ b/cpu/esp32/include/cpu_conf_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32s2.h b/cpu/esp32/include/cpu_conf_esp32s2.h
index 158a061c61c9..46d499ee7bbb 100644
--- a/cpu/esp32/include/cpu_conf_esp32s2.h
+++ b/cpu/esp32/include/cpu_conf_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/cpu_conf_esp32s3.h b/cpu/esp32/include/cpu_conf_esp32s3.h
index 6bef175c8cf4..c5a5381447a8 100644
--- a/cpu/esp32/include/cpu_conf_esp32s3.h
+++ b/cpu/esp32/include/cpu_conf_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h b/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
index c42c1287cb32..1ce2fb7736c7 100644
--- a/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
+++ b/cpu/esp32/include/esp_ble_nimble/syscfg/syscfg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/freertos/FreeRTOSConfig.h b/cpu/esp32/include/freertos/FreeRTOSConfig.h
index d822f993175a..610e1c8e9ec9 100644
--- a/cpu/esp32/include/freertos/FreeRTOSConfig.h
+++ b/cpu/esp32/include/freertos/FreeRTOSConfig.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/gpio_arch.h b/cpu/esp32/include/gpio_arch.h
index 61e5c7566074..1e203994c90f 100644
--- a/cpu/esp32/include/gpio_arch.h
+++ b/cpu/esp32/include/gpio_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/gpio_ll_arch.h b/cpu/esp32/include/gpio_ll_arch.h
index 11e6fa210430..355102f50155 100644
--- a/cpu/esp32/include/gpio_ll_arch.h
+++ b/cpu/esp32/include/gpio_ll_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/irq_arch.h b/cpu/esp32/include/irq_arch.h
index 481adceaa40e..8c6fcc2cf263 100644
--- a/cpu/esp32/include/irq_arch.h
+++ b/cpu/esp32/include/irq_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/newlib.h b/cpu/esp32/include/newlib.h
index 6a2b798fcc78..4c7d93b1ff06 100644
--- a/cpu/esp32/include/newlib.h
+++ b/cpu/esp32/include/newlib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu.h b/cpu/esp32/include/periph_cpu.h
index 94d2f49bee3f..e07d8b16e602 100644
--- a/cpu/esp32/include/periph_cpu.h
+++ b/cpu/esp32/include/periph_cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32.h b/cpu/esp32/include/periph_cpu_esp32.h
index edbf1c8b488c..a291977e8ff9 100644
--- a/cpu/esp32/include/periph_cpu_esp32.h
+++ b/cpu/esp32/include/periph_cpu_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32c3.h b/cpu/esp32/include/periph_cpu_esp32c3.h
index d3d3542de9ae..c41545cfb9af 100644
--- a/cpu/esp32/include/periph_cpu_esp32c3.h
+++ b/cpu/esp32/include/periph_cpu_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32h2.h b/cpu/esp32/include/periph_cpu_esp32h2.h
index 52fd2c0ed758..2ac8e1da6263 100644
--- a/cpu/esp32/include/periph_cpu_esp32h2.h
+++ b/cpu/esp32/include/periph_cpu_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32s2.h b/cpu/esp32/include/periph_cpu_esp32s2.h
index 3890489cd1b9..9b63e2ac7ea6 100644
--- a/cpu/esp32/include/periph_cpu_esp32s2.h
+++ b/cpu/esp32/include/periph_cpu_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/periph_cpu_esp32s3.h b/cpu/esp32/include/periph_cpu_esp32s3.h
index 42bcca221bb2..1af4220399aa 100644
--- a/cpu/esp32/include/periph_cpu_esp32s3.h
+++ b/cpu/esp32/include/periph_cpu_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/rtt_arch.h b/cpu/esp32/include/rtt_arch.h
index 60132d3482ba..8b0ea3318fa3 100644
--- a/cpu/esp32/include/rtt_arch.h
+++ b/cpu/esp32/include/rtt_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig.h b/cpu/esp32/include/sdkconfig.h
index 25c6b7a3c16e..2ae15b54b6a3 100644
--- a/cpu/esp32/include/sdkconfig.h
+++ b/cpu/esp32/include/sdkconfig.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32.h b/cpu/esp32/include/sdkconfig_esp32.h
index ea7af01f7228..581de04299ca 100644
--- a/cpu/esp32/include/sdkconfig_esp32.h
+++ b/cpu/esp32/include/sdkconfig_esp32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32c3.h b/cpu/esp32/include/sdkconfig_esp32c3.h
index 6d78cec43b8d..9568afe7d013 100644
--- a/cpu/esp32/include/sdkconfig_esp32c3.h
+++ b/cpu/esp32/include/sdkconfig_esp32c3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32h2.h b/cpu/esp32/include/sdkconfig_esp32h2.h
index 4a54c81fcc9c..1c6d5f99b69d 100644
--- a/cpu/esp32/include/sdkconfig_esp32h2.h
+++ b/cpu/esp32/include/sdkconfig_esp32h2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32s2.h b/cpu/esp32/include/sdkconfig_esp32s2.h
index e416be8d8fc0..c2ecc75341fa 100644
--- a/cpu/esp32/include/sdkconfig_esp32s2.h
+++ b/cpu/esp32/include/sdkconfig_esp32s2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sdkconfig_esp32s3.h b/cpu/esp32/include/sdkconfig_esp32s3.h
index edc3b84bc9ea..b9a78ca1a7d7 100644
--- a/cpu/esp32/include/sdkconfig_esp32s3.h
+++ b/cpu/esp32/include/sdkconfig_esp32s3.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sys/features.h b/cpu/esp32/include/sys/features.h
index fd40d4c8f45d..94021a586af7 100644
--- a/cpu/esp32/include/sys/features.h
+++ b/cpu/esp32/include/sys/features.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/sys/lock.h b/cpu/esp32/include/sys/lock.h
index 0597196409dc..a1b6333924e2 100644
--- a/cpu/esp32/include/sys/lock.h
+++ b/cpu/esp32/include/sys/lock.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/include/syscalls.h b/cpu/esp32/include/syscalls.h
index 436bcece0506..19212cec83f1 100644
--- a/cpu/esp32/include/syscalls.h
+++ b/cpu/esp32/include/syscalls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp32/irq_arch.c b/cpu/esp32/irq_arch.c
index c22ad1c9289f..ca2d23cd3392 100644
--- a/cpu/esp32/irq_arch.c
+++ b/cpu/esp32/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/Kconfig b/cpu/esp32/periph/Kconfig
index 778dca8bf568..96aee71475bf 100644
--- a/cpu/esp32/periph/Kconfig
+++ b/cpu/esp32/periph/Kconfig
@@ -1,9 +1,5 @@
-# Copyright (c) 2021 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
-#
+# SPDX-FileCopyrightText: 2021 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 choice ESP_FLASHPAGE_CAPACITY
     bool "Flashpage capacity"
diff --git a/cpu/esp32/periph/adc.c b/cpu/esp32/periph/adc.c
index b82a415e249a..0d4182ede7ea 100644
--- a/cpu/esp32/periph/adc.c
+++ b/cpu/esp32/periph/adc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32.c b/cpu/esp32/periph/adc_arch_esp32.c
index f3860dd96d40..f5d12a4990a2 100644
--- a/cpu/esp32/periph/adc_arch_esp32.c
+++ b/cpu/esp32/periph/adc_arch_esp32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32c3.c b/cpu/esp32/periph/adc_arch_esp32c3.c
index 0db3a1afb25e..147a47f1bf59 100644
--- a/cpu/esp32/periph/adc_arch_esp32c3.c
+++ b/cpu/esp32/periph/adc_arch_esp32c3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32h2.c b/cpu/esp32/periph/adc_arch_esp32h2.c
index 8cd97384fc3c..4d27f1e2faf1 100644
--- a/cpu/esp32/periph/adc_arch_esp32h2.c
+++ b/cpu/esp32/periph/adc_arch_esp32h2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32s2.c b/cpu/esp32/periph/adc_arch_esp32s2.c
index 3f11f33260e4..e4edab68cc19 100644
--- a/cpu/esp32/periph/adc_arch_esp32s2.c
+++ b/cpu/esp32/periph/adc_arch_esp32s2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/adc_arch_esp32s3.c b/cpu/esp32/periph/adc_arch_esp32s3.c
index cc9ce27d0ed7..3e79bd4772eb 100644
--- a/cpu/esp32/periph/adc_arch_esp32s3.c
+++ b/cpu/esp32/periph/adc_arch_esp32s3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/can.c b/cpu/esp32/periph/can.c
index 074924117643..37cede72e1fe 100644
--- a/cpu/esp32/periph/can.c
+++ b/cpu/esp32/periph/can.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/cpuid.c b/cpu/esp32/periph/cpuid.c
index 5799af54c9b4..fd0730c1b95a 100644
--- a/cpu/esp32/periph/cpuid.c
+++ b/cpu/esp32/periph/cpuid.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/dac.c b/cpu/esp32/periph/dac.c
index 85bd84ffb8bc..3f1552ebb5d6 100644
--- a/cpu/esp32/periph/dac.c
+++ b/cpu/esp32/periph/dac.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/flashpage.c b/cpu/esp32/periph/flashpage.c
index bff983d0976d..a0c73e3a8b21 100644
--- a/cpu/esp32/periph/flashpage.c
+++ b/cpu/esp32/periph/flashpage.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio.c b/cpu/esp32/periph/gpio.c
index 2874915f08c6..02b4ff35ea33 100644
--- a/cpu/esp32/periph/gpio.c
+++ b/cpu/esp32/periph/gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32.c b/cpu/esp32/periph/gpio_arch_esp32.c
index ba7a2c06adcd..968e260f1aa6 100644
--- a/cpu/esp32/periph/gpio_arch_esp32.c
+++ b/cpu/esp32/periph/gpio_arch_esp32.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32c3.c b/cpu/esp32/periph/gpio_arch_esp32c3.c
index 7e1e2ca6c83f..6057b6c18922 100644
--- a/cpu/esp32/periph/gpio_arch_esp32c3.c
+++ b/cpu/esp32/periph/gpio_arch_esp32c3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32h2.c b/cpu/esp32/periph/gpio_arch_esp32h2.c
index aba1f9797153..bf09f43f9507 100644
--- a/cpu/esp32/periph/gpio_arch_esp32h2.c
+++ b/cpu/esp32/periph/gpio_arch_esp32h2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32s2.c b/cpu/esp32/periph/gpio_arch_esp32s2.c
index fcf24f053217..2e8bbb6b9bf7 100644
--- a/cpu/esp32/periph/gpio_arch_esp32s2.c
+++ b/cpu/esp32/periph/gpio_arch_esp32s2.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_arch_esp32s3.c b/cpu/esp32/periph/gpio_arch_esp32s3.c
index bf554f8289b8..5d1e54c7466d 100644
--- a/cpu/esp32/periph/gpio_arch_esp32s3.c
+++ b/cpu/esp32/periph/gpio_arch_esp32s3.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_ll.c b/cpu/esp32/periph/gpio_ll.c
index 0592b8b1080b..35adcba5202b 100644
--- a/cpu/esp32/periph/gpio_ll.c
+++ b/cpu/esp32/periph/gpio_ll.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/gpio_ll_irq.c b/cpu/esp32/periph/gpio_ll_irq.c
index a3ca97e6385a..d0a6f7af3071 100644
--- a/cpu/esp32/periph/gpio_ll_irq.c
+++ b/cpu/esp32/periph/gpio_ll_irq.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/hwrng.c b/cpu/esp32/periph/hwrng.c
index c1eae7fb471f..bb54af0fc784 100644
--- a/cpu/esp32/periph/hwrng.c
+++ b/cpu/esp32/periph/hwrng.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/i2c_hw.c b/cpu/esp32/periph/i2c_hw.c
index 4a39e4aab06d..b0775026ec1d 100644
--- a/cpu/esp32/periph/i2c_hw.c
+++ b/cpu/esp32/periph/i2c_hw.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/pm.c b/cpu/esp32/periph/pm.c
index b5476b26051c..e8948422b5d0 100644
--- a/cpu/esp32/periph/pm.c
+++ b/cpu/esp32/periph/pm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/pwm.c b/cpu/esp32/periph/pwm.c
index 6d16c9c6badc..827848ce9cb1 100644
--- a/cpu/esp32/periph/pwm.c
+++ b/cpu/esp32/periph/pwm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt.c b/cpu/esp32/periph/rtt.c
index 55f0c0ee28fd..5d23595b8425 100644
--- a/cpu/esp32/periph/rtt.c
+++ b/cpu/esp32/periph/rtt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt_hw_rtc.c b/cpu/esp32/periph/rtt_hw_rtc.c
index fa60d04a96df..42aa7e14b12d 100644
--- a/cpu/esp32/periph/rtt_hw_rtc.c
+++ b/cpu/esp32/periph/rtt_hw_rtc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/rtt_hw_sys.c b/cpu/esp32/periph/rtt_hw_sys.c
index 6d841c3e5fb2..323ad4cc5b80 100644
--- a/cpu/esp32/periph/rtt_hw_sys.c
+++ b/cpu/esp32/periph/rtt_hw_sys.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/sdmmc.c b/cpu/esp32/periph/sdmmc.c
index 79759dd4fa4b..41fe4f57394d 100644
--- a/cpu/esp32/periph/sdmmc.c
+++ b/cpu/esp32/periph/sdmmc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/spi.c b/cpu/esp32/periph/spi.c
index 0ba89e6ec9c9..a08ccdb2983a 100644
--- a/cpu/esp32/periph/spi.c
+++ b/cpu/esp32/periph/spi.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/timer.c b/cpu/esp32/periph/timer.c
index f7d00cad3e31..b8b1fc341e3b 100644
--- a/cpu/esp32/periph/timer.c
+++ b/cpu/esp32/periph/timer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/periph/uart.c b/cpu/esp32/periph/uart.c
index 2c9761fe268f..29bb87039236 100644
--- a/cpu/esp32/periph/uart.c
+++ b/cpu/esp32/periph/uart.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/startup.c b/cpu/esp32/startup.c
index 8a9e3938046f..ed8949f10b35 100644
--- a/cpu/esp32/startup.c
+++ b/cpu/esp32/startup.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/stdatomic.c b/cpu/esp32/stdatomic.c
index a66d17f1b535..f7ac4953da06 100644
--- a/cpu/esp32/stdatomic.c
+++ b/cpu/esp32/stdatomic.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c b/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
index fd54f2dc2739..96c417cab0e9 100644
--- a/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
+++ b/cpu/esp32/stdio_usb_serial_jtag/usb_serial_jtag.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/syscalls.c b/cpu/esp32/syscalls.c
index 110ca1ca98e7..070b0390dcaf 100644
--- a/cpu/esp32/syscalls.c
+++ b/cpu/esp32/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp32/usb_reset.c b/cpu/esp32/usb_reset.c
index 15aec846b803..c95d517a116e 100644
--- a/cpu/esp32/usb_reset.c
+++ b/cpu/esp32/usb_reset.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2023 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/Kconfig b/cpu/esp8266/Kconfig
index 15954de294a2..2b82fcf77135 100644
--- a/cpu/esp8266/Kconfig
+++ b/cpu/esp8266/Kconfig
@@ -1,8 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_CORE_XTENSA_L106
     bool
diff --git a/cpu/esp8266/doc.md b/cpu/esp8266/doc.md
index 1613b694bd9e..074a69ebe5e1 100644
--- a/cpu/esp8266/doc.md
+++ b/cpu/esp8266/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup        cpu_esp8266 ESP8266 / ESP8285
diff --git a/cpu/esp8266/freertos/portable.c b/cpu/esp8266/freertos/portable.c
index 7bd85c597e0d..09b0e7a89d3b 100644
--- a/cpu/esp8266/freertos/portable.c
+++ b/cpu/esp8266/freertos/portable.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp8266/include/cpu_conf.h b/cpu/esp8266/include/cpu_conf.h
index a54b39e81c30..03ee026f33f8 100644
--- a/cpu/esp8266/include/cpu_conf.h
+++ b/cpu/esp8266/include/cpu_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/gpio_arch.h b/cpu/esp8266/include/gpio_arch.h
index e584dbb3ca2f..2f478559c489 100644
--- a/cpu/esp8266/include/gpio_arch.h
+++ b/cpu/esp8266/include/gpio_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/irq_arch.h b/cpu/esp8266/include/irq_arch.h
index 4cd85b2e3d81..ad656d805d6a 100644
--- a/cpu/esp8266/include/irq_arch.h
+++ b/cpu/esp8266/include/irq_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/periph_cpu.h b/cpu/esp8266/include/periph_cpu.h
index b595bb3c44a5..f0722a9e9872 100644
--- a/cpu/esp8266/include/periph_cpu.h
+++ b/cpu/esp8266/include/periph_cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/sdk_conf.h b/cpu/esp8266/include/sdk_conf.h
index 0cbc9c2f8db6..3a59385c3fb2 100644
--- a/cpu/esp8266/include/sdk_conf.h
+++ b/cpu/esp8266/include/sdk_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/sys/types.h b/cpu/esp8266/include/sys/types.h
index 14f61e1af6a5..6c1a577cf047 100644
--- a/cpu/esp8266/include/sys/types.h
+++ b/cpu/esp8266/include/sys/types.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/syscalls.h b/cpu/esp8266/include/syscalls.h
index 8dbbfda1b5fe..2bc3dff5c07e 100644
--- a/cpu/esp8266/include/syscalls.h
+++ b/cpu/esp8266/include/syscalls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/include/uart_ll.h b/cpu/esp8266/include/uart_ll.h
index 4afd1695f37a..9f60794db420 100644
--- a/cpu/esp8266/include/uart_ll.h
+++ b/cpu/esp8266/include/uart_ll.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/periph/adc.c b/cpu/esp8266/periph/adc.c
index 8c086f013a76..e3e7854cc2b1 100644
--- a/cpu/esp8266/periph/adc.c
+++ b/cpu/esp8266/periph/adc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/cpuid.c b/cpu/esp8266/periph/cpuid.c
index 2f2d68fbf644..e9189f1a2725 100644
--- a/cpu/esp8266/periph/cpuid.c
+++ b/cpu/esp8266/periph/cpuid.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/gpio.c b/cpu/esp8266/periph/gpio.c
index 414516e6932f..7c7113eedf52 100644
--- a/cpu/esp8266/periph/gpio.c
+++ b/cpu/esp8266/periph/gpio.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/hwrng.c b/cpu/esp8266/periph/hwrng.c
index 877e9d6d278d..88fd4d149082 100644
--- a/cpu/esp8266/periph/hwrng.c
+++ b/cpu/esp8266/periph/hwrng.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/pm.c b/cpu/esp8266/periph/pm.c
index 1885d21c5e8a..ed6684ea5b94 100644
--- a/cpu/esp8266/periph/pm.c
+++ b/cpu/esp8266/periph/pm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/pwm.c b/cpu/esp8266/periph/pwm.c
index 4e4495cfdd1b..76d9cf7a8f74 100644
--- a/cpu/esp8266/periph/pwm.c
+++ b/cpu/esp8266/periph/pwm.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/rtt.c b/cpu/esp8266/periph/rtt.c
index 017d9d265ad6..4616ec90f7ce 100644
--- a/cpu/esp8266/periph/rtt.c
+++ b/cpu/esp8266/periph/rtt.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/spi.c b/cpu/esp8266/periph/spi.c
index 337778311151..cd0523daf681 100644
--- a/cpu/esp8266/periph/spi.c
+++ b/cpu/esp8266/periph/spi.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/periph/timer.c b/cpu/esp8266/periph/timer.c
index 250d32046a61..30e0d29bc416 100644
--- a/cpu/esp8266/periph/timer.c
+++ b/cpu/esp8266/periph/timer.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/doc.md b/cpu/esp8266/sdk/doc.md
index 1347fc527796..ea76cc9bee2c 100644
--- a/cpu/esp8266/sdk/doc.md
+++ b/cpu/esp8266/sdk/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp8266_sdk ESP8266 SDK interface
diff --git a/cpu/esp8266/sdk/ets.c b/cpu/esp8266/sdk/ets.c
index 80c17bde95ae..4c9a30d52ff7 100644
--- a/cpu/esp8266/sdk/ets.c
+++ b/cpu/esp8266/sdk/ets.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/ets.h b/cpu/esp8266/sdk/ets.h
index d30b9e589bf5..8ffd09ab600c 100644
--- a/cpu/esp8266/sdk/ets.h
+++ b/cpu/esp8266/sdk/ets.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/phy.h b/cpu/esp8266/sdk/phy.h
index 2ffb60294ac0..2079234fa206 100644
--- a/cpu/esp8266/sdk/phy.h
+++ b/cpu/esp8266/sdk/phy.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/sdk.h b/cpu/esp8266/sdk/sdk.h
index f8b2e39f3e3b..863d6888c34e 100644
--- a/cpu/esp8266/sdk/sdk.h
+++ b/cpu/esp8266/sdk/sdk.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/sdk/system.c b/cpu/esp8266/sdk/system.c
index c280c2297e2d..9eeebd00638c 100644
--- a/cpu/esp8266/sdk/system.c
+++ b/cpu/esp8266/sdk/system.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/sdk/system.h b/cpu/esp8266/sdk/system.h
index beb4d847f766..3507fafbc7b4 100644
--- a/cpu/esp8266/sdk/system.h
+++ b/cpu/esp8266/sdk/system.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp8266/startup.c b/cpu/esp8266/startup.c
index ef809cf104d9..f3034c0db763 100644
--- a/cpu/esp8266/startup.c
+++ b/cpu/esp8266/startup.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp8266/syscalls.c b/cpu/esp8266/syscalls.c
index 81b0074b0f5d..0c9763eed379 100644
--- a/cpu/esp8266/syscalls.c
+++ b/cpu/esp8266/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/Kconfig b/cpu/esp_common/Kconfig
index be9aa6e4c5e4..47f1d7ba3d90 100644
--- a/cpu/esp_common/Kconfig
+++ b/cpu/esp_common/Kconfig
@@ -1,8 +1,5 @@
-# Copyright (c) 2020 HAW Hamburg
-#
-# This file is subject to the terms and conditions of the GNU Lesser
-# General Public License v2.1. See the file LICENSE in the top level
-# directory for more details.
+# SPDX-FileCopyrightText: 2020 HAW Hamburg
+# SPDX-License-Identifier: LGPL-2.1-only
 
 config CPU_ARCH_XTENSA
     bool
diff --git a/cpu/esp_common/doc.md b/cpu/esp_common/doc.md
index 25d27391e2e0..459cdf36ffd1 100644
--- a/cpu/esp_common/doc.md
+++ b/cpu/esp_common/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2025 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2025 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup    cpu_esp_common ESP Common
diff --git a/cpu/esp_common/esp-now/doc.md b/cpu/esp_common/esp-now/doc.md
index 0b60d0afeebf..9b82f7b54cab 100644
--- a/cpu/esp_common/esp-now/doc.md
+++ b/cpu/esp_common/esp-now/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2018 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2018 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp_common_esp_now ESP-NOW netdev interface
diff --git a/cpu/esp_common/esp-now/esp_now_gnrc.c b/cpu/esp_common/esp-now/esp_now_gnrc.c
index ba97ddffd95e..06166e91e590 100644
--- a/cpu/esp_common/esp-now/esp_now_gnrc.c
+++ b/cpu/esp_common/esp-now/esp_now_gnrc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Timo Rothenpieler
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Timo Rothenpieler
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-now/esp_now_gnrc.h b/cpu/esp_common/esp-now/esp_now_gnrc.h
index f1301b6994f0..112ade4e02b3 100644
--- a/cpu/esp_common/esp-now/esp_now_gnrc.h
+++ b/cpu/esp_common/esp-now/esp_now_gnrc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Timo Rothenpieler
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Timo Rothenpieler
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-now/esp_now_netdev.c b/cpu/esp_common/esp-now/esp_now_netdev.c
index c074846ad70a..f3cf4ae78f46 100644
--- a/cpu/esp_common/esp-now/esp_now_netdev.c
+++ b/cpu/esp_common/esp-now/esp_now_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-now/esp_now_netdev.h b/cpu/esp_common/esp-now/esp_now_netdev.h
index 7509ddf148d9..1b82c835cfbc 100644
--- a/cpu/esp_common/esp-now/esp_now_netdev.h
+++ b/cpu/esp_common/esp-now/esp_now_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-now/esp_now_params.h b/cpu/esp_common/esp-now/esp_now_params.h
index 18604925e223..694c19a55270 100644
--- a/cpu/esp_common/esp-now/esp_now_params.h
+++ b/cpu/esp_common/esp-now/esp_now_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-riscv/exceptions.c b/cpu/esp_common/esp-riscv/exceptions.c
index 5099dec321bb..77d3e69224ba 100644
--- a/cpu/esp_common/esp-riscv/exceptions.c
+++ b/cpu/esp_common/esp-riscv/exceptions.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-riscv/irq_arch.c b/cpu/esp_common/esp-riscv/irq_arch.c
index 4a04cc025d71..c60270e92a53 100644
--- a/cpu/esp_common/esp-riscv/irq_arch.c
+++ b/cpu/esp_common/esp-riscv/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-riscv/thread_arch.c b/cpu/esp_common/esp-riscv/thread_arch.c
index b5d56f64d19a..839f77b5ca15 100644
--- a/cpu/esp_common/esp-riscv/thread_arch.c
+++ b/cpu/esp_common/esp-riscv/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/doc.md b/cpu/esp_common/esp-wifi/doc.md
index d961cdd0df6d..20f74f2ca3a8 100644
--- a/cpu/esp_common/esp-wifi/doc.md
+++ b/cpu/esp_common/esp-wifi/doc.md
@@ -1,9 +1,6 @@
 <!--
-Copyright (C) 2019 Gunar Schorcht
-
-This file is subject to the terms and conditions of the GNU Lesser
-General Public License v2.1. See the file LICENSE in the top level
-directory for more details.
+SPDX-FileCopyrightText: 2019 Gunar Schorcht
+SPDX-License-Identifier: LGPL-2.1-only
 -->
 
 @defgroup   cpu_esp_common_esp_wifi ESP-WiFi netdev interface
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c b/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
index 54e47fd06fa2..2ef41990f803 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
+++ b/cpu/esp_common/esp-wifi/esp_wifi_gnrc.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_netdev.c b/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
index ec98c8f0a2f9..66a2ccb02b03 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
+++ b/cpu/esp_common/esp-wifi/esp_wifi_netdev.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_netdev.h b/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
index 940f75f3bcaf..ac1ce71581ed 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
+++ b/cpu/esp_common/esp-wifi/esp_wifi_netdev.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-wifi/esp_wifi_params.h b/cpu/esp_common/esp-wifi/esp_wifi_params.h
index 4d70bb538c4e..5ea24add8792 100644
--- a/cpu/esp_common/esp-wifi/esp_wifi_params.h
+++ b/cpu/esp_common/esp-wifi/esp_wifi_params.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/esp-xtensa/exceptions.c b/cpu/esp_common/esp-xtensa/exceptions.c
index beca13b9fb46..06c23608b998 100644
--- a/cpu/esp_common/esp-xtensa/exceptions.c
+++ b/cpu/esp_common/esp-xtensa/exceptions.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-xtensa/irq_arch.c b/cpu/esp_common/esp-xtensa/irq_arch.c
index f2b326a174a2..43ca0db43397 100644
--- a/cpu/esp_common/esp-xtensa/irq_arch.c
+++ b/cpu/esp_common/esp-xtensa/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp-xtensa/thread_arch.c b/cpu/esp_common/esp-xtensa/thread_arch.c
index c37ea4685c13..f245d977a99c 100644
--- a/cpu/esp_common/esp-xtensa/thread_arch.c
+++ b/cpu/esp_common/esp-xtensa/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/esp_events.c b/cpu/esp_common/esp_events.c
index 831fd20dc294..8f27d13b2336 100644
--- a/cpu/esp_common/esp_events.c
+++ b/cpu/esp_common/esp_events.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/freertos/event_groups.c b/cpu/esp_common/freertos/event_groups.c
index 789757624e83..f3d10f7d4c66 100644
--- a/cpu/esp_common/freertos/event_groups.c
+++ b/cpu/esp_common/freertos/event_groups.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/portable.c b/cpu/esp_common/freertos/portable.c
index a4f110783933..86a155f4488f 100644
--- a/cpu/esp_common/freertos/portable.c
+++ b/cpu/esp_common/freertos/portable.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2021 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2021 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/queue.c b/cpu/esp_common/freertos/queue.c
index 14c4149f0b61..6eb350ef2a5e 100644
--- a/cpu/esp_common/freertos/queue.c
+++ b/cpu/esp_common/freertos/queue.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/ringbuf.c b/cpu/esp_common/freertos/ringbuf.c
index bcb485f7b03d..d0a0201b0288 100644
--- a/cpu/esp_common/freertos/ringbuf.c
+++ b/cpu/esp_common/freertos/ringbuf.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #include <assert.h>
diff --git a/cpu/esp_common/freertos/semphr.c b/cpu/esp_common/freertos/semphr.c
index c87470d89294..d07b2e5dbc02 100644
--- a/cpu/esp_common/freertos/semphr.c
+++ b/cpu/esp_common/freertos/semphr.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/task.c b/cpu/esp_common/freertos/task.c
index 9af2143f97ad..be472619a847 100644
--- a/cpu/esp_common/freertos/task.c
+++ b/cpu/esp_common/freertos/task.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/freertos/timers.c b/cpu/esp_common/freertos/timers.c
index aea3e9c464d6..7c84c356ba12 100644
--- a/cpu/esp_common/freertos/timers.c
+++ b/cpu/esp_common/freertos/timers.c
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
- * FreeRTOS to RIOT-OS adaption module for source code compatibility
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #ifndef DOXYGEN
diff --git a/cpu/esp_common/include/architecture_arch.h b/cpu/esp_common/include/architecture_arch.h
index 3acd5ef69a61..3aaed0f04c1c 100644
--- a/cpu/esp_common/include/architecture_arch.h
+++ b/cpu/esp_common/include/architecture_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/atomic_utils_arch.h b/cpu/esp_common/include/atomic_utils_arch.h
index d415516fd11a..0983e903bc11 100644
--- a/cpu/esp_common/include/atomic_utils_arch.h
+++ b/cpu/esp_common/include/atomic_utils_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/cpu.h b/cpu/esp_common/include/cpu.h
index 27c80bbbed21..be05510d936e 100644
--- a/cpu/esp_common/include/cpu.h
+++ b/cpu/esp_common/include/cpu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/cpu_conf_common.h b/cpu/esp_common/include/cpu_conf_common.h
index a3e209ceaf05..0d85796bd147 100644
--- a/cpu/esp_common/include/cpu_conf_common.h
+++ b/cpu/esp_common/include/cpu_conf_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/esp_common.h b/cpu/esp_common/include/esp_common.h
index 5fb1ba764d2b..d8f3b4ea7c81 100644
--- a/cpu/esp_common/include/esp_common.h
+++ b/cpu/esp_common/include/esp_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/esp_common_log.h b/cpu/esp_common/include/esp_common_log.h
index 6f3818a33f09..8704b1a63927 100644
--- a/cpu/esp_common/include/esp_common_log.h
+++ b/cpu/esp_common/include/esp_common_log.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/exceptions.h b/cpu/esp_common/include/exceptions.h
index 7d89a10fb449..34610b824d32 100644
--- a/cpu/esp_common/include/exceptions.h
+++ b/cpu/esp_common/include/exceptions.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/freertos/FreeRTOS.h b/cpu/esp_common/include/freertos/FreeRTOS.h
index 897924338f8f..891e3ce6fc55 100644
--- a/cpu/esp_common/include/freertos/FreeRTOS.h
+++ b/cpu/esp_common/include/freertos/FreeRTOS.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/event_groups.h b/cpu/esp_common/include/freertos/event_groups.h
index 404f899111b0..fc718a88b0b9 100644
--- a/cpu/esp_common/include/freertos/event_groups.h
+++ b/cpu/esp_common/include/freertos/event_groups.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/idf_additions.h b/cpu/esp_common/include/freertos/idf_additions.h
index f10cb9152bac..9e6dd7ba9d19 100644
--- a/cpu/esp_common/include/freertos/idf_additions.h
+++ b/cpu/esp_common/include/freertos/idf_additions.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2024 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2024 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/portable.h b/cpu/esp_common/include/freertos/portable.h
index 4860d3297714..4a9b283d39f3 100644
--- a/cpu/esp_common/include/freertos/portable.h
+++ b/cpu/esp_common/include/freertos/portable.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/portmacro.h b/cpu/esp_common/include/freertos/portmacro.h
index 40e02a86474c..e90d63c47d4b 100644
--- a/cpu/esp_common/include/freertos/portmacro.h
+++ b/cpu/esp_common/include/freertos/portmacro.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/queue.h b/cpu/esp_common/include/freertos/queue.h
index 216cbb7d4b3b..2d8ae98c82eb 100644
--- a/cpu/esp_common/include/freertos/queue.h
+++ b/cpu/esp_common/include/freertos/queue.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/ringbuf.h b/cpu/esp_common/include/freertos/ringbuf.h
index 4a3b08a26d4b..3e23dea26c7d 100644
--- a/cpu/esp_common/include/freertos/ringbuf.h
+++ b/cpu/esp_common/include/freertos/ringbuf.h
@@ -1,15 +1,10 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
- *
- * At the moment this header file is empty and exists only to avoid
- * compilation errors for files of the ESP-IDF that include `ringbuf.h`,
- * such as `uart.h` even if they do not need definitions from `ringbuf.h`.
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/freertos/semphr.h b/cpu/esp_common/include/freertos/semphr.h
index b88419bed369..ab54b66be847 100644
--- a/cpu/esp_common/include/freertos/semphr.h
+++ b/cpu/esp_common/include/freertos/semphr.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/task.h b/cpu/esp_common/include/freertos/task.h
index f7ff629d293a..3ea90c728a76 100644
--- a/cpu/esp_common/include/freertos/task.h
+++ b/cpu/esp_common/include/freertos/task.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/timers.h b/cpu/esp_common/include/freertos/timers.h
index 096bda1dc36b..83ed304e49b8 100644
--- a/cpu/esp_common/include/freertos/timers.h
+++ b/cpu/esp_common/include/freertos/timers.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/freertos/xtensa_api.h b/cpu/esp_common/include/freertos/xtensa_api.h
index 20d0f26ae27c..bd6adcc6feb4 100644
--- a/cpu/esp_common/include/freertos/xtensa_api.h
+++ b/cpu/esp_common/include/freertos/xtensa_api.h
@@ -1,10 +1,9 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
- *
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+/*
  * FreeRTOS to RIOT-OS adaption module for source code compatibility
  */
 
diff --git a/cpu/esp_common/include/gpio_arch_common.h b/cpu/esp_common/include/gpio_arch_common.h
index b3bf61841775..fef60cbb7e0e 100644
--- a/cpu/esp_common/include/gpio_arch_common.h
+++ b/cpu/esp_common/include/gpio_arch_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/irq_arch_common.h b/cpu/esp_common/include/irq_arch_common.h
index 6dc8abe95e0b..8c9d0f094c46 100644
--- a/cpu/esp_common/include/irq_arch_common.h
+++ b/cpu/esp_common/include/irq_arch_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/log_module.h b/cpu/esp_common/include/log_module.h
index 93757fee3781..922a40f195be 100644
--- a/cpu/esp_common/include/log_module.h
+++ b/cpu/esp_common/include/log_module.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/syscalls_common.h b/cpu/esp_common/include/syscalls_common.h
index f73009a95876..84454ae0cd25 100644
--- a/cpu/esp_common/include/syscalls_common.h
+++ b/cpu/esp_common/include/syscalls_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/thread_arch.h b/cpu/esp_common/include/thread_arch.h
index 3730c49af2b6..d811a454339b 100644
--- a/cpu/esp_common/include/thread_arch.h
+++ b/cpu/esp_common/include/thread_arch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/tools.h b/cpu/esp_common/include/tools.h
index bd2c954ad10e..ac8674774632 100644
--- a/cpu/esp_common/include/tools.h
+++ b/cpu/esp_common/include/tools.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/include/xtensa_conf.h b/cpu/esp_common/include/xtensa_conf.h
index 417bbc374278..ad4cdd287f72 100644
--- a/cpu/esp_common/include/xtensa_conf.h
+++ b/cpu/esp_common/include/xtensa_conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/cpu/esp_common/irq_arch.c b/cpu/esp_common/irq_arch.c
index 2d8da46c45a8..e3072bca6e99 100644
--- a/cpu/esp_common/irq_arch.c
+++ b/cpu/esp_common/irq_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/lib_printf.c b/cpu/esp_common/lib_printf.c
index 78bfa6805090..b234a7e73c0a 100644
--- a/cpu/esp_common/lib_printf.c
+++ b/cpu/esp_common/lib_printf.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/flash.c b/cpu/esp_common/periph/flash.c
index ed86512f45e5..d01d0404ad11 100644
--- a/cpu/esp_common/periph/flash.c
+++ b/cpu/esp_common/periph/flash.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/i2c_sw.c b/cpu/esp_common/periph/i2c_sw.c
index ea8f333cc946..0540a2f3a332 100644
--- a/cpu/esp_common/periph/i2c_sw.c
+++ b/cpu/esp_common/periph/i2c_sw.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/periph/uart.c b/cpu/esp_common/periph/uart.c
index fd5fd21a2e7d..99c4dd6d09aa 100644
--- a/cpu/esp_common/periph/uart.c
+++ b/cpu/esp_common/periph/uart.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/syscalls.c b/cpu/esp_common/syscalls.c
index 13e2ae441f6b..d50a045eb8fc 100644
--- a/cpu/esp_common/syscalls.c
+++ b/cpu/esp_common/syscalls.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/thread_arch.c b/cpu/esp_common/thread_arch.c
index 4dcff88eee2c..ffa096ac252f 100644
--- a/cpu/esp_common/thread_arch.c
+++ b/cpu/esp_common/thread_arch.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/cpu/esp_common/tools.c b/cpu/esp_common/tools.c
index 2ee52963bacc..fda1069a97ed 100644
--- a/cpu/esp_common/tools.c
+++ b/cpu/esp_common/tools.c
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**