[PATCH 3.12 40/82] iio: max1363: Use devm_regulator_get_optional for optional regulator

[Greg Kroah-Hartman]

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/iio/adc/max1363.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/adc/max1363.c
+++ b/drivers/iio/adc/max1363.c
@@ -1527,7 +1527,7 @@ static int max1363_probe(struct i2c_clie
 	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;
 


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