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

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

[gregkh]

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 <stable@vger.kernel.org> know about it.


>From e5511c816e5ac4909bdd38e85ac344e2b9b8e984 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@kernel.org>
Date: Mon, 20 Jun 2016 13:53:33 +0100
Subject: iio:ad7266: Fix support for optional regulators

From: Mark Brown <broonie@kernel.org>

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.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -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 broonie@kernel.org 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