diff --git a/include/drivers/allwinner/axp.h b/include/drivers/allwinner/axp.h
index 9c0035f..222820b 100644
--- a/include/drivers/allwinner/axp.h
+++ b/include/drivers/allwinner/axp.h
@@ -9,6 +9,10 @@
 
 #include <stdint.h>
 
+#define AXP20X_MODE_REG 0x3e
+#define AXP20X_MODE_I2C 0x00
+#define AXP20X_MODE_RSB 0x7c
+
 #define NA 0xff
 
 enum {