hwmon: (tmp102) add vcc regulator support

Make it optional for backwards compatibility.

Signed-off-by: Peter Korsgaard <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: jacmet

drivers/hwmon/tmp102.c

@@ -16,6 +16,7 @@
 #include <linux/device.h>
 #include <linux/jiffies.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/of.h>
 
 #define	DRIVER_NAME "tmp102"
@@ -204,6 +205,10 @@ static int tmp102_probe(struct i2c_client *client)
 		return -ENODEV;
 	}
 
+	err = devm_regulator_get_enable_optional(dev, "vcc");
+	if (err < 0 && err != -ENODEV)
+		return dev_err_probe(dev, err, "Failed to enable regulator\n");
+
 	tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
 	if (!tmp102)
 		return -ENOMEM;