diff --git a/drivers/regulator/fan53555.c b/drivers/regulator/fan53555.c
index a3bc8037153e..77e9c2f20ac8 100644
--- a/drivers/regulator/fan53555.c
+++ b/drivers/regulator/fan53555.c
@@ -100,6 +100,12 @@ struct fan53555_device_info {
 	unsigned int sleep_vol_cache;
 };
 
+static unsigned int fan53555_map_mode(unsigned int mode)
+{
+	return mode == REGULATOR_MODE_FAST ?
+		REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 {
 	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
@@ -396,6 +402,8 @@ static int fan53555_regulator_probe(struct i2c_client *client,
 	if (!di)
 		return -ENOMEM;
 
+	di->desc.of_map_mode = fan53555_map_mode;
+
 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata)
 		pdata = fan53555_parse_dt(&client->dev, np, &di->desc);