linux-kernel - Re: [PATCH] gpio: gpio-tps68470: remove platform_set

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Message-ID: <CAMpxmJWmc-8cCZ5EQcnBKSAmXPbcVUnX7GdhKgKWFp5i=B6y1w@mail.gmail.com>
Date:   Fri, 21 May 2021 15:52:29 +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-tps68470: remove platform_set_drvdata() +
 cleanup probe

On Fri, May 14, 2021 at 11:41 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.
>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
> ---
>  drivers/gpio/gpio-tps68470.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/drivers/gpio/gpio-tps68470.c b/drivers/gpio/gpio-tps68470.c
> index f7f5f770e0fb..423b7bc30ae8 100644
> --- a/drivers/gpio/gpio-tps68470.c
> +++ b/drivers/gpio/gpio-tps68470.c
> @@ -125,7 +125,6 @@ static const char *tps68470_names[TPS68470_N_GPIO] = {
>  static int tps68470_gpio_probe(struct platform_device *pdev)
>  {
>         struct tps68470_gpio_data *tps68470_gpio;
> -       int ret;
>
>         tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
>                                      GFP_KERNEL);
> @@ -146,16 +145,7 @@ static int tps68470_gpio_probe(struct platform_device *pdev)
>         tps68470_gpio->gc.base = -1;
>         tps68470_gpio->gc.parent = &pdev->dev;
>
> -       ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
> -                                    tps68470_gpio);
> -       if (ret < 0) {
> -               dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
> -               return ret;
> -       }
> -
> -       platform_set_drvdata(pdev, tps68470_gpio);
> -
> -       return ret;
> +       return devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc, tps68470_gpio);
>  }
>
>  static struct platform_driver tps68470_gpio_driver = {
> --
> 2.31.1
>

Applied. I got confused by the dev_get_drvdata() call earlier in probe
but this one's for the parent.

Thanks,
Bart