linux-kernel - Re: [PATCH v4 5/9] staging: iio: ad7780: move regulator to after GPIO init

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Date:   Fri, 1 Mar 2019 07:38:45 +0000
From:   "Ardelean, Alexandru" <Alex.Ardelean@...log.com>
To:     "lars@...afoo.de" <lars@...afoo.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>,
        "knaack.h@....de" <knaack.h@....de>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "renatogeh@...il.com" <renatogeh@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "giuliano.belinassi@....br" <giuliano.belinassi@....br>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "kernel-usp@...glegroups.com" <kernel-usp@...glegroups.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 5/9] staging: iio: ad7780: move regulator to after
 GPIO init

On Thu, 2019-02-28 at 11:25 -0300, Renato Lui Geh wrote:
> 
> 
> To maintain consistency between ad7780_probe and ad7780_remove orders,
> regulator initialization has been moved to after GPIO initializations.
> 
> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>
> ---
>  drivers/staging/iio/adc/ad7780.c | 26 +++++++++++++-------------
>  1 file changed, 13 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7780.c
> b/drivers/staging/iio/adc/ad7780.c
> index ad7617a3a141..12aef0f101bc 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -255,16 +255,6 @@ static int ad7780_probe(struct spi_device *spi)
> 
>         ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);
> 
> -       st->reg = devm_regulator_get(&spi->dev, "avdd");
> -       if (IS_ERR(st->reg))
> -               return PTR_ERR(st->reg);
> -
> -       ret = regulator_enable(st->reg);
> -       if (ret) {
> -               dev_err(&spi->dev, "Failed to enable specified AVdd
> supply\n");
> -               return ret;
> -       }
> -
>         st->chip_info =
>                 &ad7780_chip_info_tbl[spi_get_device_id(spi)-
> >driver_data];
> 
> @@ -284,7 +274,7 @@ static int ad7780_probe(struct spi_device *spi)
>                 ret = PTR_ERR(st->powerdown_gpio);
>                 dev_err(&spi->dev, "Failed to request powerdown GPIO:
> %d\n",
>                         ret);
> -               goto error_disable_reg;
> +               return ret;
>         }
> 
>         if (st->chip_info->is_ad778x) {
> @@ -295,7 +285,7 @@ static int ad7780_probe(struct spi_device *spi)
>                         ret = PTR_ERR(st->gain_gpio);
>                         dev_err(&spi->dev, "Failed to request gain GPIO:
> %d\n",
>                                 ret);
> -                       goto error_disable_reg;
> +                       return ret;
>                 }
> 
>                 st->filter_gpio = devm_gpiod_get_optional(&spi->dev,
> @@ -306,10 +296,20 @@ static int ad7780_probe(struct spi_device *spi)
>                         dev_err(&spi->dev,
>                                 "Failed to request filter GPIO: %d\n",
>                                 ret);
> -                       goto error_disable_reg;
> +                       return ret;
>                 }
>         }
> 
> +       st->reg = devm_regulator_get(&spi->dev, "avdd");
> +       if (IS_ERR(st->reg))
> +               return PTR_ERR(st->reg);
> +
> +       ret = regulator_enable(st->reg);
> +       if (ret) {
> +               dev_err(&spi->dev, "Failed to enable specified AVdd
> supply\n");
> +               return ret;
> +       }
> +

I'm probably missing something, but other than the fact that this moves the
regulator init after the GPIOs init, it doesn't change much.
The order of the probe & remove is more-or-less the same.
The GPIOs will be free'd via devm_ API/stuff.


>         ret = ad_sd_setup_buffer_and_trigger(indio_dev);
>         if (ret)
>                 goto error_disable_reg;
> --
> 2.21.0
>