Patch "iio:ad7266: Fix support for optional regulators" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

iio:ad7266: Fix support for optional regulators

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iio-ad7266-fix-support-for-optional-regulators.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mark Brown <[email protected]>
Date: Mon, 20 Jun 2016 13:53:33 +0100
Subject: iio:ad7266: Fix support for optional regulators

From: Mark Brown <[email protected]>

commit e5511c816e5ac4909bdd38e85ac344e2b9b8e984 upstream.

The ad7266 driver attempts to support deciding between the use of internal and external power supplies by checking to see if an error is returned when requesting the regulator. This doesn't work with the current code since the driver uses a normal regulator_get() which is for non-optional supplies and so assumes that if a regulator is not provided by the platform then this is a bug in the platform integration and so substitutes a dummy regulator. Use regulator_get_optional() instead which indicates to the framework that the regulator may be absent and provides a dummy regulator instead.

---
 drivers/iio/adc/ad7266.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -396,7 +396,7 @@ static int ad7266_probe(struct spi_devic
 
 	st = iio_priv(indio_dev);
 
-	st->reg = devm_regulator_get(&spi->dev, "vref");
+	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
 	if (!IS_ERR(st->reg)) {
 		ret = regulator_enable(st->reg);
 		if (ret)

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/iio-ad7266-fix-probe-deferral-for-vref.patch queue-4.4/iio-ad7266-fix-broken-regulator-error-handling.patch queue-4.4/iio-ad7266-fix-support-for-optional-regulators.patch