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iio: amplifiers: ad8366: Change devm_gpiod_get() to optional and add the missed check 

Since if there is no GPIO, nothing happens, replace devm_gpiod_get()
with devm_gpiod_get_optional().
Also add IS_ERR() to fix the missing-check warning.

Fixes: cee211f4e5 ("iio: amplifiers: ad8366: Add support for the ADA4961 DGA")
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Chuhong Yuan 2020-06-03 17:26:10 +08:00 committed by Jonathan Cameron
parent df16c33a40
commit 9ca39411f9
1 changed files with 5 additions and 2 deletions
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7
drivers/iio/amplifiers/ad8366.c
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@ -262,8 +262,11 @@ static int ad8366_probe(struct spi_device *spi)
case ID_ADA4961:
case ID_ADL5240:
case ID_HMC1119:
st->reset_gpio = devm_gpiod_get(&spi->dev, "reset",
GPIOD_OUT_HIGH);
st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(st->reset_gpio)) {
ret = PTR_ERR(st->reset_gpio);
goto error_disable_reg;
}
indio_dev->channels = ada4961_channels;
indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);
break;