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iio: max1363: Use devm_regulator_get_optional for optional regulator 

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>
Cc: Stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Guenter Roeck 2014-01-27 18:10:00 +00:00 committed by Jonathan Cameron
parent 5585215b6d
commit 55b40d3731
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/max1363.c
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@ -1560,7 +1560,7 @@ 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;