diff --git a/drivers/regulator/lp8788-buck.c b/drivers/regulator/lp8788-buck.c
index 97891a7ea7b222b59c02420dcbecaadd61530b6c..eb1e1e88ae512b819307a37f4cf92a6e2a610daa 100644
--- a/drivers/regulator/lp8788-buck.c
+++ b/drivers/regulator/lp8788-buck.c
@@ -346,6 +346,7 @@ static unsigned int lp8788_buck_get_mode(struct regulator_dev *rdev)
 
 static struct regulator_ops lp8788_buck12_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = lp8788_buck12_set_voltage_sel,
 	.get_voltage_sel = lp8788_buck12_get_voltage_sel,
 	.enable = regulator_enable_regmap,
@@ -358,6 +359,7 @@ static struct regulator_ops lp8788_buck12_ops = {
 
 static struct regulator_ops lp8788_buck34_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.enable = regulator_enable_regmap,