hwmon: ina2xx: add optional regulator support

TI ina2xx sensors according to datasheets have dedicated
vs supplies. Add it for proper work.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Link: https://lore.kernel.org/r/20230407160508.20479-3-clamor95@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: clamor-s

drivers/hwmon/ina2xx.c

@@ -656,6 +656,10 @@ static int ina2xx_probe(struct i2c_client *client)
 		return PTR_ERR(data->regmap);
 	}
 
+	ret = devm_regulator_get_enable(dev, "vs");
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable vs regulator\n");
+
 	ret = ina2xx_init(data);
 	if (ret < 0) {
 		dev_err(dev, "error configuring the device: %d\n", ret);