diff --git a/common_features.mk b/common_features.mk
index 1eece0242e76..d09d4f1eff62 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -20,6 +20,13 @@ QUANTUM_SRC += \
     $(QUANTUM_DIR)/send_string.c \
     $(QUANTUM_DIR)/bitwise.c \
     $(QUANTUM_DIR)/led.c \
+    $(QUANTUM_DIR)/action.c \
+    $(QUANTUM_DIR)/action_layer.c \
+    $(QUANTUM_DIR)/action_macro.c \
+    $(QUANTUM_DIR)/action_tapping.c \
+    $(QUANTUM_DIR)/action_util.c \
+    $(QUANTUM_DIR)/eeconfig.c \
+    $(QUANTUM_DIR)/keyboard.c \
     $(QUANTUM_DIR)/keymap_common.c \
     $(QUANTUM_DIR)/keycode_config.c \
     $(QUANTUM_DIR)/logging/debug.c \
diff --git a/tmk_core/common/action.c b/quantum/action.c
similarity index 100%
rename from tmk_core/common/action.c
rename to quantum/action.c
diff --git a/tmk_core/common/action.h b/quantum/action.h
similarity index 100%
rename from tmk_core/common/action.h
rename to quantum/action.h
diff --git a/tmk_core/common/action_code.h b/quantum/action_code.h
similarity index 100%
rename from tmk_core/common/action_code.h
rename to quantum/action_code.h
diff --git a/tmk_core/common/action_layer.c b/quantum/action_layer.c
similarity index 100%
rename from tmk_core/common/action_layer.c
rename to quantum/action_layer.c
diff --git a/tmk_core/common/action_layer.h b/quantum/action_layer.h
similarity index 100%
rename from tmk_core/common/action_layer.h
rename to quantum/action_layer.h
diff --git a/tmk_core/common/action_macro.c b/quantum/action_macro.c
similarity index 100%
rename from tmk_core/common/action_macro.c
rename to quantum/action_macro.c
diff --git a/tmk_core/common/action_macro.h b/quantum/action_macro.h
similarity index 100%
rename from tmk_core/common/action_macro.h
rename to quantum/action_macro.h
diff --git a/tmk_core/common/action_tapping.c b/quantum/action_tapping.c
similarity index 100%
rename from tmk_core/common/action_tapping.c
rename to quantum/action_tapping.c
diff --git a/tmk_core/common/action_tapping.h b/quantum/action_tapping.h
similarity index 100%
rename from tmk_core/common/action_tapping.h
rename to quantum/action_tapping.h
diff --git a/tmk_core/common/action_util.c b/quantum/action_util.c
similarity index 100%
rename from tmk_core/common/action_util.c
rename to quantum/action_util.c
diff --git a/tmk_core/common/action_util.h b/quantum/action_util.h
similarity index 100%
rename from tmk_core/common/action_util.h
rename to quantum/action_util.h
diff --git a/tmk_core/common/eeconfig.c b/quantum/eeconfig.c
similarity index 100%
rename from tmk_core/common/eeconfig.c
rename to quantum/eeconfig.c
diff --git a/tmk_core/common/eeconfig.h b/quantum/eeconfig.h
similarity index 100%
rename from tmk_core/common/eeconfig.h
rename to quantum/eeconfig.h
diff --git a/tmk_core/common/keyboard.c b/quantum/keyboard.c
similarity index 99%
rename from tmk_core/common/keyboard.c
rename to quantum/keyboard.c
index fcc51973fda3..0eb41e7d3098 100644
--- a/tmk_core/common/keyboard.c
+++ b/quantum/keyboard.c
@@ -256,6 +256,8 @@ void keyboard_setup(void) {
     keyboard_pre_init_kb();
 }
 
+#ifndef SPLIT_KEYBOARD
+
 /** \brief is_keyboard_master
  *
  * FIXME: needs doc
@@ -268,6 +270,8 @@ __attribute__((weak)) bool is_keyboard_master(void) { return true; }
  */
 __attribute__((weak)) bool is_keyboard_left(void) { return true; }
 
+#endif
+
 /** \brief should_process_keypress
  *
  * Override this function if you have a condition where keypresses processing should change:
diff --git a/tmk_core/common/keyboard.h b/quantum/keyboard.h
similarity index 100%
rename from tmk_core/common/keyboard.h
rename to quantum/keyboard.h
diff --git a/tmk_core/common/keycode.h b/quantum/keycode.h
similarity index 100%
rename from tmk_core/common/keycode.h
rename to quantum/keycode.h
diff --git a/quantum/via.h b/quantum/via.h
index d0510fcabd3b..de0a21da20cf 100644
--- a/quantum/via.h
+++ b/quantum/via.h
@@ -16,7 +16,7 @@
 
 #pragma once
 
-#include "tmk_core/common/eeconfig.h"  // for EECONFIG_SIZE
+#include "eeconfig.h"  // for EECONFIG_SIZE
 
 // Keyboard level code can change where VIA stores the magic.
 // The magic is the build date YYMMDD encoded as BCD in 3 bytes,
diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 57de8d95e87b..69d27e6c0be9 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -1,14 +1,8 @@
 COMMON_DIR = common
 PLATFORM_COMMON_DIR = $(COMMON_DIR)/$(PLATFORM_KEY)
 
-TMK_COMMON_SRC +=	$(COMMON_DIR)/host.c \
-	$(COMMON_DIR)/keyboard.c \
-	$(COMMON_DIR)/action.c \
-	$(COMMON_DIR)/action_tapping.c \
-	$(COMMON_DIR)/action_macro.c \
-	$(COMMON_DIR)/action_layer.c \
-	$(COMMON_DIR)/action_util.c \
-	$(COMMON_DIR)/eeconfig.c \
+TMK_COMMON_SRC +=	\
+	$(COMMON_DIR)/host.c \
 	$(COMMON_DIR)/report.c \
 	$(COMMON_DIR)/sync_timer.c \
 	$(COMMON_DIR)/usb_util.c \