linux-kernel - Re: [PATCH v3] iio: amplifiers: ad8366: Change devm_gpiod_get() to optional and add the missed check

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Date:   Wed, 3 Jun 2020 10:19:12 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "hslester96@...il.com" <hslester96@...il.com>
CC:     "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "paul.cercueil@...log.com" <paul.cercueil@...log.com>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "knaack.h@....de" <knaack.h@....de>,
        "jic23@...nel.org" <jic23@...nel.org>
Subject: Re: [PATCH v3] iio: amplifiers: ad8366: Change devm_gpiod_get() to
 optional and add the missed check

On Wed, 2020-06-03 at 17:26 +0800, Chuhong Yuan wrote:
> 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 bug.
> 

Acked-by: Alexandru Ardelean <alexandru.ardelean@...log.com>

> Fixes: cee211f4e5a0 ("iio: amplifiers: ad8366: Add support for the ADA4961
> DGA")
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> ---
> Changes in v3:
>   - Change devm_gpiod_get() to optional.
>   - Modify description.
> 
>  drivers/iio/amplifiers/ad8366.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
> index 62167b87caea..8819e8997f76 100644
> --- a/drivers/iio/amplifiers/ad8366.c
> +++ b/drivers/iio/amplifiers/ad8366.c
> @@ -262,8 +262,12 @@ 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",
> +		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;