diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 471eb90..51f0574 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -75,6 +75,7 @@
 	const struct regmap_access_table *precious_table;
 
 	int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
+	int (*reg_write)(void *context, unsigned int reg, unsigned int val);
 
 	u8 read_flag_mask;
 	u8 write_flag_mask;