tests: drivers: dac: Add support test app DAC for RA4

Add support test app dac_api, dac_loopback for Renesas
ek_ra4l1, ek_ra4w1, ek_ra4m1

Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>

Author: khoa-nguyen-18

tests/drivers/dac/dac_api/Kconfig

@@ -0,0 +1,11 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "DAC API test"
+
+source "Kconfig.zephyr"
+
+config DAC_BUFFER_NOT_SUPPORT
+	bool "DAC on board/SoC does not support output buffer mode"
+	help
+	  If this config is turned on, the test will run with no output buffer enabled

tests/drivers/dac/dac_api/boards/ek_ra4l1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_api/boards/ek_ra4m1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_api/boards/ek_ra4w1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_api/src/test_dac.c

@@ -110,9 +110,13 @@
 #endif
 
 static const struct dac_channel_cfg dac_ch_cfg = {
-	.channel_id  = DAC_CHANNEL_ID,
-	.resolution  = DAC_RESOLUTION,
-	.buffered = true
+	.channel_id = DAC_CHANNEL_ID,
+	.resolution = DAC_RESOLUTION,
+#if defined(CONFIG_DAC_BUFFER_NOT_SUPPORT)
+	.buffered = false,
+#else
+	.buffered = true,
+#endif /* CONFIG_DAC_BUFFER_NOT_SUPPORT */
 };
 
 const struct device *get_dac_device(void)

tests/drivers/dac/dac_loopback/Kconfig

@@ -0,0 +1,11 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "DAC Loopback test"
+
+source "Kconfig.zephyr"
+
+config DAC_BUFFER_NOT_SUPPORT
+	bool "DAC on board/SoC does not support output buffer mode"
+	help
+	  If this config is turned on, the test will run with no output buffer enabled

tests/drivers/dac/dac_loopback/boards/ek_ra4l1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_loopback/boards/ek_ra4m1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_loopback/boards/ek_ra4w1.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_DAC_BUFFER_NOT_SUPPORT=y

tests/drivers/dac/dac_loopback/src/test_dac.c

@@ -176,7 +176,13 @@
 #define ADC_GAIN             ADC_GAIN_1
 #define ADC_REFERENCE        ADC_REF_INTERNAL
 #define ADC_ACQUISITION_TIME ADC_ACQ_TIME_DEFAULT
-#define ADC_CHANNEL_ID       0
+#if defined(CONFIG_BOARD_EK_RA4L1)
+#define ADC_CHANNEL_ID 1
+#elif defined(CONFIG_BOARD_EK_RA4W1)
+#define ADC_CHANNEL_ID 4
+#else
+#define ADC_CHANNEL_ID 0
+#endif
 
 #else
 #error "Unsupported board."
@@ -185,7 +191,11 @@
 static const struct dac_channel_cfg dac_ch_cfg = {
 	.channel_id = DAC_CHANNEL_ID,
 	.resolution = DAC_RESOLUTION,
-	.buffered = true
+#if defined(CONFIG_DAC_BUFFER_NOT_SUPPORT)
+	.buffered = false,
+#else
+	.buffered = true,
+#endif /* CONFIG_DAC_BUFFER_NOT_SUPPORT */
 };
 
 static const struct adc_channel_cfg adc_ch_cfg = {