Remove legacy USE_SERIAL define (#18292)

* Remove legacy USE_SERIAL define

* tidy up missed comments

9 files changed, 6 insertions, 41 deletions

diff --git a/layouts/community/ortho_4x12/buswerks/config.h b/layouts/community/ortho_4x12/buswerks/config.h
index 8d6e26287e..f96d099db5 100644
--- a/layouts/community/ortho_4x12/buswerks/config.h
+++ b/layouts/community/ortho_4x12/buswerks/config.h
@@ -1,24 +1,19 @@
 #pragma once
 
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
-
 /* Select hand configuration */
 
 #define MASTER_LEFT
 // #define _MASTER_RIGHT
 // #define EE_HANDS
 
-#ifdef AUDIO_ENABLE 
-    #define STARTUP_SONG SONG(PLANCK_SOUND) 
-    // #define STARTUP_SONG SONG(NO_SOUND) 
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(PLANCK_SOUND)
+    // #define STARTUP_SONG SONG(NO_SOUND)
     #define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
                                 	SONG(COLEMAK_SOUND), \
                                     SONG(DVORAK_SOUND) \
-                                } 
-#endif 
+                                }
+#endif
 
 // MIDI notes can be sent when in Music mode
 #define MIDI_BASIC
diff --git a/layouts/community/ortho_4x12/colemak_mod_dh_wide/config.h b/layouts/community/ortho_4x12/colemak_mod_dh_wide/config.h
index 33e9342039..2f0c23b7f1 100644
--- a/layouts/community/ortho_4x12/colemak_mod_dh_wide/config.h
+++ b/layouts/community/ortho_4x12/colemak_mod_dh_wide/config.h
@@ -20,11 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
-
 /* Select hand configuration */
 
 #define MASTER_LEFT
diff --git a/layouts/community/ortho_4x12/crs/config.h b/layouts/community/ortho_4x12/crs/config.h
index 33e9342039..9ba64c921b 100644
--- a/layouts/community/ortho_4x12/crs/config.h
+++ b/layouts/community/ortho_4x12/crs/config.h
@@ -20,10 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
 
 /* Select hand configuration */
 
diff --git a/layouts/community/ortho_4x12/drashna/config.h b/layouts/community/ortho_4x12/drashna/config.h
index 0b10a64eaa..1c88d66f3b 100644
--- a/layouts/community/ortho_4x12/drashna/config.h
+++ b/layouts/community/ortho_4x12/drashna/config.h
@@ -46,7 +46,6 @@
 #endif
 
 #if defined(KEYBOARD_lets_split_rev2)
-#    define USE_SERIAL
 #    undef USE_I2C
 #    define EE_HANDS
 #endif
diff --git a/layouts/community/ortho_4x12/ergodoxish/config.h b/layouts/community/ortho_4x12/ergodoxish/config.h
index 33e9342039..2f0c23b7f1 100644
--- a/layouts/community/ortho_4x12/ergodoxish/config.h
+++ b/layouts/community/ortho_4x12/ergodoxish/config.h
@@ -20,11 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
-
 /* Select hand configuration */
 
 #define MASTER_LEFT
diff --git a/layouts/community/ortho_4x12/grahampheath/config.h b/layouts/community/ortho_4x12/grahampheath/config.h
index 8bc3d7762d..342c55cdea 100644
--- a/layouts/community/ortho_4x12/grahampheath/config.h
+++ b/layouts/community/ortho_4x12/grahampheath/config.h
@@ -23,11 +23,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "keyboards/lets_split/config.h"
 
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
-
 /* Select hand configuration */
 
 #define MASTER_LEFT
diff --git a/layouts/community/ortho_4x12/symbolic/config.h b/layouts/community/ortho_4x12/symbolic/config.h
index 3f88b4cc17..db74d0fdfa 100644
--- a/layouts/community/ortho_4x12/symbolic/config.h
+++ b/layouts/community/ortho_4x12/symbolic/config.h
@@ -20,13 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-
-
-/* Use I2C or Serial, not both */
-
-#define USE_SERIAL
-// #define USE_I2C
-
 /* Select hand configuration */
 
 //#define MASTER_LEFT
diff --git a/layouts/community/ortho_4x12/wanleg/config.h b/layouts/community/ortho_4x12/wanleg/config.h
index bcf2756f6b..7ec47302bc 100644
--- a/layouts/community/ortho_4x12/wanleg/config.h
+++ b/layouts/community/ortho_4x12/wanleg/config.h
@@ -15,7 +15,6 @@
 #define QMK_LED B0
 #define QMK_ESC_OUTPUT F6 // usually COL
 #define QMK_ESC_INPUT D7 // usually ROW
-#define USE_SERIAL
 #undef USE_I2C
 #define EE_HANDS
 #endif
@@ -36,7 +35,7 @@
 
 // use alternate settings for 4x4 board using ProMicro instead of Micro
 // usage: make 4x4:wanleg PM=yes
-#if defined(KEYBOARD_40percentclub_4x4) && defined(PRO_MICRO) 
+#if defined(KEYBOARD_40percentclub_4x4) && defined(PRO_MICRO)
 #define QMK_ESC_OUTPUT F4 // usually COL
 #define QMK_ESC_INPUT D1 // usually ROW
 #define QMK_LED B0
diff --git a/layouts/community/ortho_4x12/xyverz/config.h b/layouts/community/ortho_4x12/xyverz/config.h
index 287f4cc2b7..6486e0831c 100644
--- a/layouts/community/ortho_4x12/xyverz/config.h
+++ b/layouts/community/ortho_4x12/xyverz/config.h
@@ -3,8 +3,6 @@
 
 #define MIDI_BASIC
 
-#define USE_SERIAL
-
 #define EE_HANDS
 
 #undef RGBLED_NUM