diff --git a/platform/stm32f7xx/power.c b/platform/stm32/power.c
similarity index 100%
rename from platform/stm32f7xx/power.c
rename to platform/stm32/power.c
diff --git a/platform/stm32/rules.mk b/platform/stm32/rules.mk
new file mode 100644
index 00000000..cb3ccec9
--- /dev/null
+++ b/platform/stm32/rules.mk
@@ -0,0 +1,10 @@
+# Code shared across different stm32 platforms.
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS += \
+	$(LOCAL_DIR)/power.c
+
+include make/module.mk
diff --git a/platform/stm32f4xx/rules.mk b/platform/stm32f4xx/rules.mk
index 02e6d2af..33c0535e 100644
--- a/platform/stm32f4xx/rules.mk
+++ b/platform/stm32f4xx/rules.mk
@@ -47,6 +47,7 @@ LINKER_SCRIPT += \
 	$(BUILDDIR)/system-twosegment.ld
 
 MODULE_DEPS += \
+	platform/stm32 \
 	platform/stm32f4xx/STM32F4xx_StdPeriph_Driver \
 	arch/arm/arm-m/systick \
 	lib/cbuf \
diff --git a/platform/stm32f7xx/rules.mk b/platform/stm32f7xx/rules.mk
index 27c033cd..1c20f031 100644
--- a/platform/stm32f7xx/rules.mk
+++ b/platform/stm32f7xx/rules.mk
@@ -43,7 +43,6 @@ MODULE_SRCS += \
 	$(LOCAL_DIR)/flash.c \
 	$(LOCAL_DIR)/gpio.c \
 	$(LOCAL_DIR)/init.c \
-	$(LOCAL_DIR)/power.c \
 	$(LOCAL_DIR)/timer.c \
 	$(LOCAL_DIR)/uart.c \
 	$(LOCAL_DIR)/usbc.c \
@@ -60,6 +59,7 @@ LINKER_SCRIPT += \
 	$(BUILDDIR)/system-twosegment.ld
 
 MODULE_DEPS += \
+	platform/stm32 \
 	platform/stm32f7xx/STM32F7xx_HAL_Driver \
 	arch/arm/arm-m/systick \
 	dev/gpio \