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Date: Mon, 25 Jul 2016 13:55:24 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Mark Brown <broonie@...nel.org>, Jonathan Cameron <jic23@...nel.org> Subject: [PATCH 3.14 42/53] iio:ad7266: Fix support for optional regulators 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mark Brown <broonie@...nel.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@...nel.org> Signed-off-by: Jonathan Cameron <jic23@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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)
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