diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c
index c37ccbfd52f2..96c07fa1802a 100644
--- a/drivers/mfd/hi655x-pmic.c
+++ b/drivers/mfd/hi655x-pmic.c
@@ -49,7 +49,7 @@ static struct regmap_config hi655x_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = HI655X_STRIDE,
 	.val_bits = 8,
-	.max_register = HI655X_BUS_ADDR(0xFFF),
+	.max_register = HI655X_BUS_ADDR(0x400) - HI655X_STRIDE,
 };
 
 static struct resource pwrkey_resources[] = {