diff --git a/keyboards/chew/config.h b/keyboards/chew/config.h
index 22b43cf799..df672bc4e1 100644
--- a/keyboards/chew/config.h
+++ b/keyboards/chew/config.h
@@ -8,4 +8,3 @@
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 200U // In ms in which the double tap can occur
 
 #define EE_HANDS
-#define SERIAL_USART_TX_PIN GP11
diff --git a/keyboards/chew/keyboard.json b/keyboards/chew/keyboard.json
index 94617257e8..01175e6341 100644
--- a/keyboards/chew/keyboard.json
+++ b/keyboards/chew/keyboard.json
@@ -33,7 +33,8 @@
             }
         },
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP11"
         },
         "transport": {
             "watchdog": true
diff --git a/keyboards/keychron/q11/config.h b/keyboards/keychron/q11/config.h
index b1b40c98ab..1fda4b18d7 100755
--- a/keyboards/keychron/q11/config.h
+++ b/keyboards/keychron/q11/config.h
@@ -29,9 +29,6 @@
 #define SNLED27351_CURRENT_TUNE \
     { 0x80, 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0x80, 0xFF, 0xFF } // 300mA
 
-/* Split Keyboard specific options. */
-#define SERIAL_USART_TX_PIN A9 // USART TX pin
-
 /* Encoder Configuration */
 #define ENCODER_DEFAULT_POS 0x3
 
diff --git a/keyboards/keychron/q11/info.json b/keyboards/keychron/q11/info.json
index 62d1119ebd..73c4233876 100755
--- a/keyboards/keychron/q11/info.json
+++ b/keyboards/keychron/q11/info.json
@@ -54,7 +54,8 @@
             }
         },
         "serial": {
-            "driver": "usart"
+            "driver": "usart",
+            "pin": "A9"
         },
         "transport": {
             "sync" :{
diff --git a/keyboards/mlego/m60_split/rev1/config.h b/keyboards/mlego/m60_split/rev1/config.h
index 9f991d0fcc..406ff66e5a 100644
--- a/keyboards/mlego/m60_split/rev1/config.h
+++ b/keyboards/mlego/m60_split/rev1/config.h
@@ -15,5 +15,4 @@
  */
 #pragma once
 
-#define SERIAL_USART_TX_PIN B6
 #define SERIAL_USART_SPEED 921600
diff --git a/keyboards/mlego/m60_split/rev1/keyboard.json b/keyboards/mlego/m60_split/rev1/keyboard.json
index cbd951dac9..fd98df8bf9 100644
--- a/keyboards/mlego/m60_split/rev1/keyboard.json
+++ b/keyboards/mlego/m60_split/rev1/keyboard.json
@@ -73,7 +73,8 @@
             }
         },
         "serial": {
-            "driver": "usart"
+            "driver": "usart",
+            "pin": "B6"
         },
         "transport": {
             "sync": {
diff --git a/keyboards/mlego/m60_split/rev2/config.h b/keyboards/mlego/m60_split/rev2/config.h
index 49218935d7..7d22252451 100644
--- a/keyboards/mlego/m60_split/rev2/config.h
+++ b/keyboards/mlego/m60_split/rev2/config.h
@@ -15,8 +15,6 @@
  */
 #pragma once
 
-#define SERIAL_USART_TX_PIN B6
-
 #define SERIAL_USART_SPEED 921600
 
 #define RGBLIGHT_LAYERS
diff --git a/keyboards/mlego/m60_split/rev2/keyboard.json b/keyboards/mlego/m60_split/rev2/keyboard.json
index d8029696a8..269373033f 100644
--- a/keyboards/mlego/m60_split/rev2/keyboard.json
+++ b/keyboards/mlego/m60_split/rev2/keyboard.json
@@ -66,7 +66,8 @@
             }
         },
         "serial": {
-            "driver": "usart"
+            "driver": "usart",
+            "pin": "B6"
         },
         "transport": {
             "sync": {
diff --git a/keyboards/pica40/rev2/config.h b/keyboards/pica40/rev2/config.h
index 1a59bee3dd..dad718ad0f 100644
--- a/keyboards/pica40/rev2/config.h
+++ b/keyboards/pica40/rev2/config.h
@@ -3,8 +3,6 @@
 
 #pragma once
 
-#define SERIAL_USART_TX_PIN GP0
-
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP17
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 500U
diff --git a/keyboards/pica40/rev2/keyboard.json b/keyboards/pica40/rev2/keyboard.json
index f4cc4c2697..64b043f274 100644
--- a/keyboards/pica40/rev2/keyboard.json
+++ b/keyboards/pica40/rev2/keyboard.json
@@ -42,7 +42,8 @@
             }
         },
         "serial": {
-            "driver": "vendor"
+            "driver": "vendor",
+            "pin": "GP0"
         }
     },
     "encoder": {