diff --git a/keyboards/25keys/zinc/rev1/keyboard.json b/keyboards/25keys/zinc/rev1/keyboard.json
index c1bead2d8ab5..fd11273c181d 100644
--- a/keyboards/25keys/zinc/rev1/keyboard.json
+++ b/keyboards/25keys/zinc/rev1/keyboard.json
@@ -22,7 +22,9 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "tapping": {
     "term": 100
diff --git a/keyboards/25keys/zinc/reva/keyboard.json b/keyboards/25keys/zinc/reva/keyboard.json
index 01d2291c4915..dedc8f22f858 100644
--- a/keyboards/25keys/zinc/reva/keyboard.json
+++ b/keyboards/25keys/zinc/reva/keyboard.json
@@ -22,7 +22,9 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "tapping": {
     "term": 100
diff --git a/keyboards/40percentclub/25/keyboard.json b/keyboards/40percentclub/25/keyboard.json
index aede80ef1727..e23d0578c3fc 100644
--- a/keyboards/40percentclub/25/keyboard.json
+++ b/keyboards/40percentclub/25/keyboard.json
@@ -28,7 +28,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/40percentclub/6lit/keyboard.json b/keyboards/40percentclub/6lit/keyboard.json
index 06ffc890d2b0..52a8914d7d75 100644
--- a/keyboards/40percentclub/6lit/keyboard.json
+++ b/keyboards/40percentclub/6lit/keyboard.json
@@ -28,7 +28,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/40percentclub/foobar/keyboard.json b/keyboards/40percentclub/foobar/keyboard.json
index 0a2769e04a68..ec568b238274 100644
--- a/keyboards/40percentclub/foobar/keyboard.json
+++ b/keyboards/40percentclub/foobar/keyboard.json
@@ -28,7 +28,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/40percentclub/half_n_half/keyboard.json b/keyboards/40percentclub/half_n_half/keyboard.json
index 3e0c646a500c..4f18d235b22f 100644
--- a/keyboards/40percentclub/half_n_half/keyboard.json
+++ b/keyboards/40percentclub/half_n_half/keyboard.json
@@ -28,7 +28,9 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D0"
+    "serial": {
+      "pin": "D0"
+    }
   },
   "processor": "atmega32u4",
   "bootloader": "caterina",
diff --git a/keyboards/a_dux/keyboard.json b/keyboards/a_dux/keyboard.json
index c4089fb035c8..97c8610155d4 100644
--- a/keyboards/a_dux/keyboard.json
+++ b/keyboards/a_dux/keyboard.json
@@ -25,7 +25,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D1",
         "bootmagic": {
             "matrix": [4, 4]
         },
@@ -38,6 +37,9 @@
                     ["B5", "B4", null, null, null]
                 ]
             }
+        },
+        "serial": {
+            "pin": "D1"
         }
     },
     "community_layouts": ["split_3x5_2"],
diff --git a/keyboards/adkb96/rev1/keyboard.json b/keyboards/adkb96/rev1/keyboard.json
index 77f9177555a3..7cf92f151631 100644
--- a/keyboards/adkb96/rev1/keyboard.json
+++ b/keyboards/adkb96/rev1/keyboard.json
@@ -28,7 +28,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "tapping": {
         "term": 100
diff --git a/keyboards/afternoonlabs/breeze/rev0/keyboard.json b/keyboards/afternoonlabs/breeze/rev0/keyboard.json
index e4288d3eda7d..6ff73b1c1582 100644
--- a/keyboards/afternoonlabs/breeze/rev0/keyboard.json
+++ b/keyboards/afternoonlabs/breeze/rev0/keyboard.json
@@ -24,7 +24,9 @@
         "handedness": {
             "pin": "B3"
         },
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "bootmagic": {
         "matrix": [0, 5]
diff --git a/keyboards/afternoonlabs/breeze/rev1/keyboard.json b/keyboards/afternoonlabs/breeze/rev1/keyboard.json
index 22a7edb6c09c..a0a0395add0f 100644
--- a/keyboards/afternoonlabs/breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/breeze/rev1/keyboard.json
@@ -24,7 +24,9 @@
         "handedness": {
             "pin": "B3"
         },
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "bootmagic": {
         "matrix": [0, 5]
diff --git a/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json b/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
index f614b93ca11f..e70eb1169ed2 100644
--- a/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/oceanbreeze/rev1/keyboard.json
@@ -24,7 +24,9 @@
         "handedness": {
             "pin": "B3"
         },
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "bootmagic": {
         "matrix": [0, 5]
diff --git a/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json b/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
index 2ec7b411e1c6..8de6b42470c5 100644
--- a/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/southern_breeze/rev1/keyboard.json
@@ -24,7 +24,9 @@
         "handedness": {
             "pin": "B3"
         },
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "bootmagic": {
         "matrix": [0, 5]
diff --git a/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json b/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
index 9377f10732cd..f2285fb17b46 100644
--- a/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
+++ b/keyboards/afternoonlabs/summer_breeze/rev1/keyboard.json
@@ -24,7 +24,9 @@
         "handedness": {
             "pin": "B3"
         },
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "bootmagic": {
         "matrix": [0, 5]
diff --git a/keyboards/ai03/altair/keyboard.json b/keyboards/ai03/altair/keyboard.json
index cf551ab79e38..a8cd8b02a765 100644
--- a/keyboards/ai03/altair/keyboard.json
+++ b/keyboards/ai03/altair/keyboard.json
@@ -38,9 +38,9 @@
             }
         },
         "serial": {
-            "driver": "vendor"
-        },
-        "soft_serial_pin": "GP29"
+            "driver": "vendor",
+            "pin": "GP29"
+        }
     },
     "url": "https://ai03.com/",
     "usb": {
diff --git a/keyboards/ai03/altair_x/keyboard.json b/keyboards/ai03/altair_x/keyboard.json
index 1568f15a5aff..27f36af97bbc 100644
--- a/keyboards/ai03/altair_x/keyboard.json
+++ b/keyboards/ai03/altair_x/keyboard.json
@@ -38,9 +38,9 @@
             }
         },
         "serial": {
-            "driver": "vendor"
-        },
-        "soft_serial_pin": "GP29"
+            "driver": "vendor",
+            "pin": "GP29"
+        }
     },
     "url": "https://ai03.com/",
     "usb": {
diff --git a/keyboards/ai03/orbit/keyboard.json b/keyboards/ai03/orbit/keyboard.json
index a5a60c12b6cf..f13c95291d3a 100644
--- a/keyboards/ai03/orbit/keyboard.json
+++ b/keyboards/ai03/orbit/keyboard.json
@@ -34,13 +34,15 @@
         "handedness": {
             "pin": "D5"
         },
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["D4", "D6", "F1", "F0", "F4", "F5", "C6"],
                 "rows": ["B6", "B5", "B4", "D7", "E6"]
             }
         },
+        "serial" :{
+            "pin": "D0"
+        },
         "transport":{
             "sync" :{
                 "indicators": true,
diff --git a/keyboards/ai03/orbit_x/keyboard.json b/keyboards/ai03/orbit_x/keyboard.json
index 732384121932..d039969b37c4 100644
--- a/keyboards/ai03/orbit_x/keyboard.json
+++ b/keyboards/ai03/orbit_x/keyboard.json
@@ -31,12 +31,14 @@
         "handedness": {
             "pin": "D5"
         },
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["D6", "B6", "B1", "B0", "B3", "B2"],
                 "rows": ["B5", "D7", "B4", "D4"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/aidansmithdotdev/sango/keyboard.json b/keyboards/aidansmithdotdev/sango/keyboard.json
index c3d34ce6d7b2..9d3fd9f50d4a 100644
--- a/keyboards/aidansmithdotdev/sango/keyboard.json
+++ b/keyboards/aidansmithdotdev/sango/keyboard.json
@@ -128,9 +128,9 @@
             }
         },
         "serial": {
-            "driver": "vendor"
-        },
-        "soft_serial_pin": "GP1"
+            "driver": "vendor",
+            "pin": "GP1"
+        }
     },
     "url": "https://aidansmith.dev",
     "usb": {
diff --git a/keyboards/aleblazer/zodiark/keyboard.json b/keyboards/aleblazer/zodiark/keyboard.json
index 9f77049dee10..fba239866ed0 100644
--- a/keyboards/aleblazer/zodiark/keyboard.json
+++ b/keyboards/aleblazer/zodiark/keyboard.json
@@ -60,13 +60,15 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3",
         "encoder": {
             "right": {
                 "rotary": [
                     {"pin_a": "D4", "pin_b": "D2", "resolution": 3}
                 ]
             }
+        },
+        "serial": {
+            "pin": "D3"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/arabica37/rev1/keyboard.json b/keyboards/arabica37/rev1/keyboard.json
index 710a377ab9a2..63c4fe2940e0 100644
--- a/keyboards/arabica37/rev1/keyboard.json
+++ b/keyboards/arabica37/rev1/keyboard.json
@@ -21,7 +21,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "rgblight": {
         "led_count": 50,
diff --git a/keyboards/avalanche/v1/keyboard.json b/keyboards/avalanche/v1/keyboard.json
index 97acaf0d9f92..0e539bdefc54 100644
--- a/keyboards/avalanche/v1/keyboard.json
+++ b/keyboards/avalanche/v1/keyboard.json
@@ -21,7 +21,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/avalanche/v2/keyboard.json b/keyboards/avalanche/v2/keyboard.json
index 219e5bb6c6ea..2c38fd1056aa 100644
--- a/keyboards/avalanche/v2/keyboard.json
+++ b/keyboards/avalanche/v2/keyboard.json
@@ -35,7 +35,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/avalanche/v3/keyboard.json b/keyboards/avalanche/v3/keyboard.json
index 6104dbd79398..84191a103fb5 100644
--- a/keyboards/avalanche/v3/keyboard.json
+++ b/keyboards/avalanche/v3/keyboard.json
@@ -27,7 +27,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "rgblight": {
         "led_count": 12,
diff --git a/keyboards/avalanche/v4/keyboard.json b/keyboards/avalanche/v4/keyboard.json
index 2a4909ba3689..2a548c5665e6 100644
--- a/keyboards/avalanche/v4/keyboard.json
+++ b/keyboards/avalanche/v4/keyboard.json
@@ -28,7 +28,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "ws2812": {
         "pin": "D3"
diff --git a/keyboards/bandominedoni/keyboard.json b/keyboards/bandominedoni/keyboard.json
index c253da0c8390..41212aedefc6 100644
--- a/keyboards/bandominedoni/keyboard.json
+++ b/keyboards/bandominedoni/keyboard.json
@@ -30,13 +30,15 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
         "encoder": {
             "right": {
                 "rotary": [
                     {"pin_a": "F5", "pin_b": "F4"}
                 ]
             }
+        },
+        "serial": {
+            "pin": "D2"
         }
     },
     "qmk": {
diff --git a/keyboards/basekeys/slice/rev1/keyboard.json b/keyboards/basekeys/slice/rev1/keyboard.json
index c341597ee669..a6097e560a77 100644
--- a/keyboards/basekeys/slice/rev1/keyboard.json
+++ b/keyboards/basekeys/slice/rev1/keyboard.json
@@ -26,7 +26,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/basekeys/slice/rev1_rgb/keyboard.json b/keyboards/basekeys/slice/rev1_rgb/keyboard.json
index a666f2666174..d6d7b8ad451e 100644
--- a/keyboards/basekeys/slice/rev1_rgb/keyboard.json
+++ b/keyboards/basekeys/slice/rev1_rgb/keyboard.json
@@ -31,7 +31,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "ws2812": {
         "pin": "D3"
diff --git a/keyboards/biacco42/ergo42/rev1/keyboard.json b/keyboards/biacco42/ergo42/rev1/keyboard.json
index b3a53bb3a4ca..c75e9d1c511c 100644
--- a/keyboards/biacco42/ergo42/rev1/keyboard.json
+++ b/keyboards/biacco42/ergo42/rev1/keyboard.json
@@ -33,7 +33,9 @@
   "diode_direction": "COL2ROW",
   "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+          "pin": "D0"
+        }
     },
   "processor": "atmega32u4",
   "bootloader": "caterina",
diff --git a/keyboards/blank_tehnologii/manibus/keyboard.json b/keyboards/blank_tehnologii/manibus/keyboard.json
index f6cd41758db5..eeabe64f36ee 100644
--- a/keyboards/blank_tehnologii/manibus/keyboard.json
+++ b/keyboards/blank_tehnologii/manibus/keyboard.json
@@ -24,12 +24,14 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["B6", "B5", "D6", "D5", "D3", "D7", "B4"],
                 "rows": ["F5", "F1", "B2", "B1", "C6"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/bluebell/swoop/keyboard.json b/keyboards/bluebell/swoop/keyboard.json
index 5cc29818b868..08f61ac20dd0 100644
--- a/keyboards/bluebell/swoop/keyboard.json
+++ b/keyboards/bluebell/swoop/keyboard.json
@@ -42,13 +42,15 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2",
     "encoder": {
       "right": {
         "rotary": [
           {"pin_a": "B5", "pin_b": "B4"}
         ]
       }
+    },
+    "serial": {
+      "pin": "D2"
     }
   },
   "processor": "atmega32u4",
diff --git a/keyboards/boardsource/lulu/avr/keyboard.json b/keyboards/boardsource/lulu/avr/keyboard.json
index 73f86a435f8f..ce9fa7c0a675 100644
--- a/keyboards/boardsource/lulu/avr/keyboard.json
+++ b/keyboards/boardsource/lulu/avr/keyboard.json
@@ -8,7 +8,9 @@
     "rows": ["C6", "D7", "E6", "B4", "B5"]
   },
   "split": {
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "ws2812": {
      "pin": "D3"
diff --git a/keyboards/boardsource/microdox/v1/keyboard.json b/keyboards/boardsource/microdox/v1/keyboard.json
index d35a58777eb0..f13f9435720c 100644
--- a/keyboards/boardsource/microdox/v1/keyboard.json
+++ b/keyboards/boardsource/microdox/v1/keyboard.json
@@ -10,7 +10,9 @@
     "device_version": "1.0.0"
   },
   "split": {
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "rgblight": {
     "sleep": true,
diff --git a/keyboards/boardsource/microdox/v2/keyboard.json b/keyboards/boardsource/microdox/v2/keyboard.json
index 94577059c523..d733af7a03fa 100644
--- a/keyboards/boardsource/microdox/v2/keyboard.json
+++ b/keyboards/boardsource/microdox/v2/keyboard.json
@@ -19,7 +19,6 @@
     ]
   },
   "split": {
-    "soft_serial_pin": "D3",
     "matrix_pins": {
       "right": {
         "cols": ["F4", "B1", "D7", "C6", "B3"],
@@ -32,6 +31,9 @@
           {"pin_a": "B6", "pin_b": "B2"}
         ]
       }
+    },
+    "serial": {
+      "pin": "D3"
     }
   },
   "rgb_matrix": {
diff --git a/keyboards/boardsource/unicorne/keyboard.json b/keyboards/boardsource/unicorne/keyboard.json
index f9d1a5e6662d..da1c3a787ee1 100644
--- a/keyboards/boardsource/unicorne/keyboard.json
+++ b/keyboards/boardsource/unicorne/keyboard.json
@@ -20,9 +20,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "GP0",
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP0"
         },
         "transport": {
             "sync": {
diff --git a/keyboards/buzzard/rev1/keyboard.json b/keyboards/buzzard/rev1/keyboard.json
index dd17a82754ba..41c85de0fc31 100644
--- a/keyboards/buzzard/rev1/keyboard.json
+++ b/keyboards/buzzard/rev1/keyboard.json
@@ -30,7 +30,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "transport": {
             "sync": {
                 "oled": true
diff --git a/keyboards/clickety_split/leeloo/info.json b/keyboards/clickety_split/leeloo/info.json
index c83fedeb2803..2c17a28c8d89 100644
--- a/keyboards/clickety_split/leeloo/info.json
+++ b/keyboards/clickety_split/leeloo/info.json
@@ -26,13 +26,15 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2",
     "encoder": {
       "right": {
         "rotary": [
           {"pin_a": "F4", "pin_b": "F5"}
         ]
       }
+    },
+    "serial": {
+      "pin": "D2"
     }
   },
   "development_board": "promicro",
diff --git a/keyboards/controllerworks/mini36/keyboard.json b/keyboards/controllerworks/mini36/keyboard.json
index dc0f63638f77..9f5e0815a560 100644
--- a/keyboards/controllerworks/mini36/keyboard.json
+++ b/keyboards/controllerworks/mini36/keyboard.json
@@ -39,9 +39,9 @@
                 ]
             }
         },
-        "soft_serial_pin": "GP1",
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP1"
         },
         "transport": {
             "protocol": "serial",
diff --git a/keyboards/controllerworks/mini42/keyboard.json b/keyboards/controllerworks/mini42/keyboard.json
index a1dc0df34c2e..3c7d89e4683f 100644
--- a/keyboards/controllerworks/mini42/keyboard.json
+++ b/keyboards/controllerworks/mini42/keyboard.json
@@ -39,9 +39,9 @@
                 ]
             }
         },
-        "soft_serial_pin": "GP1",
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP1"
         },
         "transport": {
             "protocol": "serial",
diff --git a/keyboards/cradio/keyboard.json b/keyboards/cradio/keyboard.json
index 6241995c04df..421bafaf39c1 100644
--- a/keyboards/cradio/keyboard.json
+++ b/keyboards/cradio/keyboard.json
@@ -43,7 +43,9 @@
                 ]
             }
         },
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "transport": {
             "protocol": "serial"
         }
diff --git a/keyboards/crkbd/r2g/keyboard.json b/keyboards/crkbd/r2g/keyboard.json
index 991a5301f494..e6c49d5fc862 100644
--- a/keyboards/crkbd/r2g/keyboard.json
+++ b/keyboards/crkbd/r2g/keyboard.json
@@ -3,7 +3,9 @@
         "rgb_matrix": true
     },
     "split": {
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/crkbd/rev1/keyboard.json b/keyboards/crkbd/rev1/keyboard.json
index 108bfb7370a3..c9b5c27884cc 100644
--- a/keyboards/crkbd/rev1/keyboard.json
+++ b/keyboards/crkbd/rev1/keyboard.json
@@ -3,7 +3,9 @@
         "rgblight": true
     },
     "split": {
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/dailycraft/claw44/rev1/keyboard.json b/keyboards/dailycraft/claw44/rev1/keyboard.json
index 724cf5979fb4..62b069a49036 100644
--- a/keyboards/dailycraft/claw44/rev1/keyboard.json
+++ b/keyboards/dailycraft/claw44/rev1/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/dailycraft/sandbox/rev2/keyboard.json b/keyboards/dailycraft/sandbox/rev2/keyboard.json
index c9f2b8f567fa..1eb61ee12c7f 100644
--- a/keyboards/dailycraft/sandbox/rev2/keyboard.json
+++ b/keyboards/dailycraft/sandbox/rev2/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/dailycraft/wings42/rev1/keyboard.json b/keyboards/dailycraft/wings42/rev1/keyboard.json
index 6b19954d881e..f4a3949c61ec 100644
--- a/keyboards/dailycraft/wings42/rev1/keyboard.json
+++ b/keyboards/dailycraft/wings42/rev1/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/dailycraft/wings42/rev1_extkeys/keyboard.json b/keyboards/dailycraft/wings42/rev1_extkeys/keyboard.json
index 1d77f044fbb4..bebe264cc071 100644
--- a/keyboards/dailycraft/wings42/rev1_extkeys/keyboard.json
+++ b/keyboards/dailycraft/wings42/rev1_extkeys/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/dailycraft/wings42/rev2/keyboard.json b/keyboards/dailycraft/wings42/rev2/keyboard.json
index c3b686cec449..3f2cb1b766d6 100644
--- a/keyboards/dailycraft/wings42/rev2/keyboard.json
+++ b/keyboards/dailycraft/wings42/rev2/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "encoder": {
         "rotary": [
diff --git a/keyboards/deltasplit75/v2/keyboard.json b/keyboards/deltasplit75/v2/keyboard.json
index 4d3d42ad0463..031d2b9185dc 100644
--- a/keyboards/deltasplit75/v2/keyboard.json
+++ b/keyboards/deltasplit75/v2/keyboard.json
@@ -14,7 +14,9 @@
     "diode_direction": "COL2ROW",
     "split": {
       "enabled": true,
-      "soft_serial_pin": "D0"
+      "serial": {
+        "pin": "D0"
+      }
     },
     "rgblight": {
       "led_count": 12
diff --git a/keyboards/dm9records/ergoinu/keyboard.json b/keyboards/dm9records/ergoinu/keyboard.json
index c132f18268ba..1f91a06600cf 100644
--- a/keyboards/dm9records/ergoinu/keyboard.json
+++ b/keyboards/dm9records/ergoinu/keyboard.json
@@ -15,7 +15,9 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "rgblight": {
     "hue_steps": 10,
diff --git a/keyboards/doppelganger/keyboard.json b/keyboards/doppelganger/keyboard.json
index f77597c9903a..88569270123e 100644
--- a/keyboards/doppelganger/keyboard.json
+++ b/keyboards/doppelganger/keyboard.json
@@ -22,7 +22,9 @@
         "handedness": {
             "pin": "D4"
         },
-        "soft_serial_pin": "D1",
+        "serial": {
+            "pin": "D1"
+        },
         "matrix_pins": {
             "right": {
                 "cols": ["F1", "F0", "F4", "F5", "F6", "F7", "C7", "C6", "B6"],
diff --git a/keyboards/draculad/keyboard.json b/keyboards/draculad/keyboard.json
index bfaa8a4979df..3ba2f0efae52 100644
--- a/keyboards/draculad/keyboard.json
+++ b/keyboards/draculad/keyboard.json
@@ -37,7 +37,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
         "encoder": {
             "right": {
                 "rotary": [
@@ -45,6 +44,9 @@
                     {"pin_a": "B4", "pin_b": "B5", "resolution": 1}
                 ]
             }
+        },
+        "serial": {
+            "pin": "D2"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/dumbo/keyboard.json b/keyboards/dumbo/keyboard.json
index df0f1100128a..b833915d80e7 100644
--- a/keyboards/dumbo/keyboard.json
+++ b/keyboards/dumbo/keyboard.json
@@ -21,7 +21,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
         "encoder": {
             "right": {
                 "rotary": [
@@ -29,6 +28,9 @@
                     {"pin_a": "B5", "pin_b": "C6"}
                 ]
             }
+        },
+        "serial": {
+            "pin": "D2"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/elephant42/keyboard.json b/keyboards/elephant42/keyboard.json
index e71f1438130a..d1d321623e43 100644
--- a/keyboards/elephant42/keyboard.json
+++ b/keyboards/elephant42/keyboard.json
@@ -42,7 +42,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/ergoslab/rev1/keyboard.json b/keyboards/ergoslab/rev1/keyboard.json
index ef40c1d960d8..0d017d7a977d 100644
--- a/keyboards/ergoslab/rev1/keyboard.json
+++ b/keyboards/ergoslab/rev1/keyboard.json
@@ -15,7 +15,9 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "rgblight": {
     "led_count": 2
diff --git a/keyboards/ergotravel/rev1/keyboard.json b/keyboards/ergotravel/rev1/keyboard.json
index 7a6710c7bd8f..0c34bf04bd5c 100644
--- a/keyboards/ergotravel/rev1/keyboard.json
+++ b/keyboards/ergotravel/rev1/keyboard.json
@@ -15,7 +15,9 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D0"
+    "serial": {
+      "pin": "D0"
+    }
   },
   "rgblight": {
     "led_count": 12
diff --git a/keyboards/etiennecollin/wave/keyboard.json b/keyboards/etiennecollin/wave/keyboard.json
index 5e31a1ca2afd..272cbdd002d9 100644
--- a/keyboards/etiennecollin/wave/keyboard.json
+++ b/keyboards/etiennecollin/wave/keyboard.json
@@ -37,7 +37,9 @@
     "community_layouts": ["split_3x5_3"],
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "usb_detect": {
             "enabled": true
         },
diff --git a/keyboards/fatotesa/keyboard.json b/keyboards/fatotesa/keyboard.json
index bdd5e40478d8..ba6fc08d0c2d 100644
--- a/keyboards/fatotesa/keyboard.json
+++ b/keyboards/fatotesa/keyboard.json
@@ -21,7 +21,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
+        "serial": {
+            "pin": "D2"
+        },
         "usb_detect": {
             "enabled": true,
             "timeout": 2500
diff --git a/keyboards/ferris/sweep/keyboard.json b/keyboards/ferris/sweep/keyboard.json
index 567ef16a8640..0bb407cb7902 100644
--- a/keyboards/ferris/sweep/keyboard.json
+++ b/keyboards/ferris/sweep/keyboard.json
@@ -23,7 +23,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
         "bootmagic": {
             "matrix": [4, 4]
         },
@@ -36,6 +35,9 @@
                     ["B5", "B4", null, null, null]
                 ]
             }
+        },
+        "serial": {
+            "pin": "D2"
         }
     },
     "community_layouts": ["split_3x5_2"],
diff --git a/keyboards/fluorite/keyboard.json b/keyboards/fluorite/keyboard.json
index 2338c7267123..37e74c387cfb 100644
--- a/keyboards/fluorite/keyboard.json
+++ b/keyboards/fluorite/keyboard.json
@@ -15,7 +15,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu",
diff --git a/keyboards/flxlb/zplit/keyboard.json b/keyboards/flxlb/zplit/keyboard.json
index 2fcbd81742c4..cd16ef7a1505 100644
--- a/keyboards/flxlb/zplit/keyboard.json
+++ b/keyboards/flxlb/zplit/keyboard.json
@@ -56,7 +56,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu",
diff --git a/keyboards/for_science/keyboard.json b/keyboards/for_science/keyboard.json
index da36bf9188f2..5ae7808d424a 100644
--- a/keyboards/for_science/keyboard.json
+++ b/keyboards/for_science/keyboard.json
@@ -10,7 +10,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "features": {
         "bootmagic": true,
diff --git a/keyboards/fortitude60/rev1/keyboard.json b/keyboards/fortitude60/rev1/keyboard.json
index cf3af329a871..4ad8a723b736 100644
--- a/keyboards/fortitude60/rev1/keyboard.json
+++ b/keyboards/fortitude60/rev1/keyboard.json
@@ -25,7 +25,9 @@
   },
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D2"
+    "serial": {
+      "pin": "D2"
+    }
   },
   "processor": "atmega32u4",
   "bootloader": "caterina",
diff --git a/keyboards/fungo/rev1/keyboard.json b/keyboards/fungo/rev1/keyboard.json
index 06ebf87f05e4..0970a027c876 100644
--- a/keyboards/fungo/rev1/keyboard.json
+++ b/keyboards/fungo/rev1/keyboard.json
@@ -25,12 +25,14 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D3",
     "matrix_pins": {
       "right": {
         "cols": ["F7", "F6", "F5", "F4", "B5", "B4", "E6"],
         "rows": ["D1", "D0", "D4", "C6", "D7", "D3"]
       }
+    },
+    "serial": {
+      "pin": "D3"
     }
   },
   "qmk": {
diff --git a/keyboards/giabalanai/keyboard.json b/keyboards/giabalanai/keyboard.json
index 6cadf0232815..ae43139dad7b 100644
--- a/keyboards/giabalanai/keyboard.json
+++ b/keyboards/giabalanai/keyboard.json
@@ -51,7 +51,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2",
         "encoder": {
             "right": {
                 "rotary": [
@@ -64,6 +63,9 @@
                 "cols": ["F4", "F5", "F6", "F7", "B1", "B3", "B2", "C7", "B7", "F1"],
                 "rows": ["D1", "D0", "D4", "C6", "D7", "E6"]
             }
+        },
+        "serial": {
+            "pin": "D2"
         }
     },
     "qmk": {
diff --git a/keyboards/gregandcin/teaqueen/keyboard.json b/keyboards/gregandcin/teaqueen/keyboard.json
index e4903ea6c05f..871c34587dd5 100644
--- a/keyboards/gregandcin/teaqueen/keyboard.json
+++ b/keyboards/gregandcin/teaqueen/keyboard.json
@@ -25,9 +25,9 @@
                 "rows": ["GP5", "GP6", "GP7", "GP8", "GP9"]
             }
         },
-        "soft_serial_pin": "GP3",
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP3"
         }
     },
     "url": "https://github.com/gregandcin/teaqueen",
diff --git a/keyboards/halfcliff/keyboard.json b/keyboards/halfcliff/keyboard.json
index a864c4ce332d..7d780c016a5a 100644
--- a/keyboards/halfcliff/keyboard.json
+++ b/keyboards/halfcliff/keyboard.json
@@ -15,7 +15,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D2"
+        "serial": {
+            "pin": "D2"
+        }
     },
     "rgblight": {
         "saturation_steps": 8,
diff --git a/keyboards/handwired/brain/keyboard.json b/keyboards/handwired/brain/keyboard.json
index 95c09ecfc905..c5f8c3682ceb 100644
--- a/keyboards/handwired/brain/keyboard.json
+++ b/keyboards/handwired/brain/keyboard.json
@@ -40,7 +40,6 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0",
         "bootmagic": {
             "matrix": [5, 0]
         },
@@ -48,6 +47,9 @@
             "right": {
                 "cols": ["B5", "B4", "E6", "D7", "C6", "D4", "D1"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/handwired/chiron/keyboard.json b/keyboards/handwired/chiron/keyboard.json
index efbf66335b31..1685a9d47766 100644
--- a/keyboards/handwired/chiron/keyboard.json
+++ b/keyboards/handwired/chiron/keyboard.json
@@ -44,7 +44,9 @@
         "handedness": {
             "pin": "D2"
         },
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu",
diff --git a/keyboards/handwired/dmote/keyboard.json b/keyboards/handwired/dmote/keyboard.json
index fc52fee11e91..e6514b17ba5d 100644
--- a/keyboards/handwired/dmote/keyboard.json
+++ b/keyboards/handwired/dmote/keyboard.json
@@ -36,7 +36,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "layouts": {
         "LAYOUT": {
diff --git a/keyboards/handwired/elrgo_s/keyboard.json b/keyboards/handwired/elrgo_s/keyboard.json
index 0da809d2ac52..c0ae4beadb64 100644
--- a/keyboards/handwired/elrgo_s/keyboard.json
+++ b/keyboards/handwired/elrgo_s/keyboard.json
@@ -23,7 +23,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/handwired/freoduo/keyboard.json b/keyboards/handwired/freoduo/keyboard.json
index 0d23776f4a64..d9f4ad480888 100644
--- a/keyboards/handwired/freoduo/keyboard.json
+++ b/keyboards/handwired/freoduo/keyboard.json
@@ -25,7 +25,9 @@
 "diode_direction": "COL2ROW",
 "split": {
     "enabled": true,
-    "soft_serial_pin": "D0"
+    "serial": {
+        "pin": "D0"
+    }
 },
 "rgblight": {
     "hue_steps": 16,
diff --git a/keyboards/handwired/jotlily60/keyboard.json b/keyboards/handwired/jotlily60/keyboard.json
index 65faa354a513..7a8a2a50d91f 100644
--- a/keyboards/handwired/jotlily60/keyboard.json
+++ b/keyboards/handwired/jotlily60/keyboard.json
@@ -24,7 +24,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3"
+        "serial": {
+            "pin": "D3"
+        }
     },
     "layouts": {
         "LAYOUT": {
diff --git a/keyboards/handwired/jtallbean/split_65/keyboard.json b/keyboards/handwired/jtallbean/split_65/keyboard.json
index 7ce6d9f09544..b10e6c6cc079 100644
--- a/keyboards/handwired/jtallbean/split_65/keyboard.json
+++ b/keyboards/handwired/jtallbean/split_65/keyboard.json
@@ -35,12 +35,14 @@
         "handedness": {
             "pin": "D5"
         },
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["B4", "B5", "B6", "C6", "C7", "D4", "D6", "D3", "D2"],
                 "rows": ["E6", "F0", "F1", "F7", "D7"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/handwired/ks63/keyboard.json b/keyboards/handwired/ks63/keyboard.json
index 6040074f071b..09e59975e8eb 100644
--- a/keyboards/handwired/ks63/keyboard.json
+++ b/keyboards/handwired/ks63/keyboard.json
@@ -29,7 +29,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0"
+        "serial": {
+            "pin": "D0"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/handwired/myskeeb/keyboard.json b/keyboards/handwired/myskeeb/keyboard.json
index f2da286f194a..c75f40cf462c 100644
--- a/keyboards/handwired/myskeeb/keyboard.json
+++ b/keyboards/handwired/myskeeb/keyboard.json
@@ -16,11 +16,13 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3",
         "matrix_pins": {
             "right": {
                 "cols": ["F5", "B3", "F7", "B1", "F6", "B2", "B6"]
             }
+        },
+        "serial": {
+            "pin": "D3"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/handwired/not_so_minidox/keyboard.json b/keyboards/handwired/not_so_minidox/keyboard.json
index c3cc59884077..fa68a823afd5 100644
--- a/keyboards/handwired/not_so_minidox/keyboard.json
+++ b/keyboards/handwired/not_so_minidox/keyboard.json
@@ -29,7 +29,9 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D0"
+    "serial": {
+      "pin": "D0"
+    }
   },
   "processor": "atmega32u4",
   "bootloader": "caterina",
diff --git a/keyboards/handwired/qc60/proto/keyboard.json b/keyboards/handwired/qc60/proto/keyboard.json
index 0015ac5f669c..810df8b7aed0 100644
--- a/keyboards/handwired/qc60/proto/keyboard.json
+++ b/keyboards/handwired/qc60/proto/keyboard.json
@@ -30,7 +30,9 @@
   "diode_direction": "ROW2COL",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D0"
+    "serial": {
+      "pin": "D0"
+    }
   },
   "processor": "atmega32u4",
   "bootloader": "caterina",
diff --git a/keyboards/handwired/split65/promicro/keyboard.json b/keyboards/handwired/split65/promicro/keyboard.json
index 5efdd93629fa..8b50ea84297b 100644
--- a/keyboards/handwired/split65/promicro/keyboard.json
+++ b/keyboards/handwired/split65/promicro/keyboard.json
@@ -16,7 +16,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3"
+        "serial": {
+            "pin": "D3"
+        }
     },
     "processor": "atmega32u4",
     "bootloader": "caterina",
diff --git a/keyboards/handwired/split65/stm32/keyboard.json b/keyboards/handwired/split65/stm32/keyboard.json
index 4f2d069aedbc..5d838de5f707 100644
--- a/keyboards/handwired/split65/stm32/keyboard.json
+++ b/keyboards/handwired/split65/stm32/keyboard.json
@@ -7,9 +7,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "A9",
         "serial": {
-            "driver": "usart"
+            "driver": "usart",
+            "pin": "A9"
         }
     },
     "development_board": "proton_c",
diff --git a/keyboards/handwired/split89/keyboard.json b/keyboards/handwired/split89/keyboard.json
index 029988b0baca..fdd092745f00 100644
--- a/keyboards/handwired/split89/keyboard.json
+++ b/keyboards/handwired/split89/keyboard.json
@@ -32,12 +32,14 @@
         "handedness": {
             "pin": "D1"
         },
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["F5", "F4", "B5", "B4", "E6", "D7", "C6", "D4", "D2", "D3"],
                 "rows": ["F6", "F7", "B1", "B3", "B2", "B6"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",
diff --git a/keyboards/handwired/split_cloud/keyboard.json b/keyboards/handwired/split_cloud/keyboard.json
index 8d242cc6e602..fc1d2498df37 100644
--- a/keyboards/handwired/split_cloud/keyboard.json
+++ b/keyboards/handwired/split_cloud/keyboard.json
@@ -29,7 +29,9 @@
     },
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3",
+        "serial": {
+            "pin": "D3"
+        },
         "matrix_pins": {
             "right": {
                 "cols": ["D4", "C6", "D7", "E6", "B4", "B5"],
diff --git a/keyboards/handwired/stef9998/split_5x7/rev1/keyboard.json b/keyboards/handwired/stef9998/split_5x7/rev1/keyboard.json
index fe277ebde00b..5f524ea44528 100644
--- a/keyboards/handwired/stef9998/split_5x7/rev1/keyboard.json
+++ b/keyboards/handwired/stef9998/split_5x7/rev1/keyboard.json
@@ -23,12 +23,14 @@
   "diode_direction": "COL2ROW",
   "split": {
     "enabled": true,
-    "soft_serial_pin": "D0",
     "matrix_pins": {
       "right": {
         "cols": ["F5", "F6", "F7", "B1", "B3", "B2", "B6"],
         "rows": ["B5", "B4", "E6", "D7", "C6"]
       }
+    },
+    "serial": {
+      "pin": "D0"
     }
   },
   "processor": "atmega32u4",
diff --git a/keyboards/handwired/tsubasa/keyboard.json b/keyboards/handwired/tsubasa/keyboard.json
index 05fd05968a4a..31e6bb72ccfe 100644
--- a/keyboards/handwired/tsubasa/keyboard.json
+++ b/keyboards/handwired/tsubasa/keyboard.json
@@ -46,7 +46,6 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D3",
         "encoder": {
             "right": {
                 "rotary": [
@@ -54,6 +53,9 @@
                 ]
             }
         },
+        "serial": {
+            "pin": "D3"
+        },
         "transport": {
             "sync": {
                 "layer_state": true,
diff --git a/keyboards/handwired/unk/rev1/keyboard.json b/keyboards/handwired/unk/rev1/keyboard.json
index bfc4ee3c7977..0de8b29f41c7 100644
--- a/keyboards/handwired/unk/rev1/keyboard.json
+++ b/keyboards/handwired/unk/rev1/keyboard.json
@@ -21,12 +21,14 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
-        "soft_serial_pin": "D0",
         "matrix_pins": {
             "right": {
                 "cols": ["B1", "B3", "B2", "B6", "F7", "B5", "F6", "F5"],
                 "rows": ["C6", "D7", "B4", "E6", "D4"]
             }
+        },
+        "serial": {
+            "pin": "D0"
         }
     },
     "processor": "atmega32u4",