linux-kernel - Re: [PATCH] gpio: gpio-spear-spics: remove platform_set

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Message-ID: <CAMpxmJXDAmX=Rp26A-N6SRx4WXjaf+v+XfKvZjWLSaY=WHAqzQ@mail.gmail.com>
Date:   Tue, 25 May 2021 16:35:37 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Alexandru Ardelean <aardelean@...iqon.com>
Cc:     linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] gpio: gpio-spear-spics: remove platform_set_drvdata() +
 cleanup probe

On Sun, May 16, 2021 at 9:43 AM Alexandru Ardelean
<aardelean@...iqon.com> wrote:
>
> The platform_set_drvdata() call is only useful if we need to retrieve back
> the private information.
> Since the driver doesn't do that, it's not useful to have it.
>
> If this is removed, we can also just do a direct return on
> devm_gpiochip_add_data(). We don't need to print that this call failed as
> there are other ways to log/see this during probe.
>
> This change isn't removing the 'DT probe failed' message, as some may find
> it useful as a reason for the failed probe. But that can be part of another
> change if needed.
>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
> ---
>  drivers/gpio/gpio-spear-spics.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/drivers/gpio/gpio-spear-spics.c b/drivers/gpio/gpio-spear-spics.c
> index 6eca531b7d96..49aac2bb8d2c 100644
> --- a/drivers/gpio/gpio-spear-spics.c
> +++ b/drivers/gpio/gpio-spear-spics.c
> @@ -122,7 +122,6 @@ static int spics_gpio_probe(struct platform_device *pdev)
>  {
>         struct device_node *np = pdev->dev.of_node;
>         struct spear_spics *spics;
> -       int ret;
>
>         spics = devm_kzalloc(&pdev->dev, sizeof(*spics), GFP_KERNEL);
>         if (!spics)
> @@ -148,8 +147,6 @@ static int spics_gpio_probe(struct platform_device *pdev)
>                                 &spics->cs_enable_shift))
>                 goto err_dt_data;
>
> -       platform_set_drvdata(pdev, spics);
> -
>         spics->chip.ngpio = NUM_OF_GPIO;
>         spics->chip.base = -1;
>         spics->chip.request = spics_request;
> @@ -163,14 +160,7 @@ static int spics_gpio_probe(struct platform_device *pdev)
>         spics->chip.owner = THIS_MODULE;
>         spics->last_off = -1;
>
> -       ret = devm_gpiochip_add_data(&pdev->dev, &spics->chip, spics);
> -       if (ret) {
> -               dev_err(&pdev->dev, "unable to add gpio chip\n");
> -               return ret;
> -       }
> -
> -       dev_info(&pdev->dev, "spear spics registered\n");
> -       return 0;
> +       return devm_gpiochip_add_data(&pdev->dev, &spics->chip, spics);
>
>  err_dt_data:
>         dev_err(&pdev->dev, "DT probe failed\n");
> --
> 2.31.1
>

Applied, thanks!

Bart