iio: max1363: Use devm_regulator_get_optional for optional regulator

commit 55b40d37311807a6bb2acdae0df904f54a0da3ae upstream.

In kernel version 3.13, devm_regulator_get() may return no error
if a regulator is undeclared. regulator_get_voltage() will return
-EINVAL if this happens. This causes the driver to fail loading if
the vref regulator is not declared.

Since vref is optional, call devm_regulator_get_optional instead.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/max1363.c b/drivers/iio/adc/max1363.c
index 4fb35d1..cfb3d39 100644 (file)
--- a/drivers/iio/adc/max1363.c
+++ b/drivers/iio/adc/max1363.c
@@ -1527,7 +1527,7 @@ static int max1363_probe(struct i2c_client *client,
        st->client = client;
 
        st->vref_uv = st->chip_info->int_vref_mv * 1000;
-       vref = devm_regulator_get(&client->dev, "vref");
+       vref = devm_regulator_get_optional(&client->dev, "vref");
        if (!IS_ERR(vref)) {
                int vref_uv;