hwmon: (adm1177) simplify using devm_regulator_get_enable()

Drop open-coded pattern: 'devm_regulator_get(), regulator_enable(),
add_action_or_reset(regulator_disable)' and use the
devm_regulator_get_enable() and drop the pointer to the regulator.
This simplifies code and makes it less tempting to add manual control
for the regulator which is also controlled by devm.
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/7773541795f280db31dd981ffc21df8a630b794a.1666357434.git.mazziesaccount@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/adm1177.c

@@ -26,14 +26,12 @@
 /**
  * struct adm1177_state - driver instance specific data
  * @client:		pointer to i2c client
- * @reg:		regulator info for the power supply of the device
  * @r_sense_uohm:	current sense resistor value
  * @alert_threshold_ua:	current limit for shutdown
  * @vrange_high:	internal voltage divider
  */
 struct adm1177_state {
 	struct i2c_client	*client;
-	struct regulator	*reg;
 	u32			r_sense_uohm;
 	u32			alert_threshold_ua;
 	bool			vrange_high;
@@ -189,13 +187,6 @@ static const struct hwmon_chip_info adm1177_chip_info = {
 	.info = adm1177_info,
 };
 
-static void adm1177_remove(void *data)
-{
-	struct adm1177_state *st = data;
-
-	regulator_disable(st->reg);
-}
-
 static int adm1177_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -210,21 +201,9 @@ static int adm1177_probe(struct i2c_client *client)
 
 	st->client = client;
 
-	st->reg = devm_regulator_get_optional(&client->dev, "vref");
-	if (IS_ERR(st->reg)) {
-		if (PTR_ERR(st->reg) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-
-		st->reg = NULL;
-	} else {
-		ret = regulator_enable(st->reg);
-		if (ret)
-			return ret;
-		ret = devm_add_action_or_reset(&client->dev, adm1177_remove,
-					       st);
-		if (ret)
-			return ret;
-	}
+	ret = devm_regulator_get_enable_optional(&client->dev, "vref");
+	if (ret == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
 
 	if (device_property_read_u32(dev, "shunt-resistor-micro-ohms",
 				     &st->r_sense_uohm))