linux-kernel - Re: [PATCH v2 02/11] gpiolib: have a single place of calling set

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Message-ID: <CAHp75Vc2E4iXDvq4wV7nkoizPaz_vRxfYztzwStt9ux9oYWExg@mail.gmail.com>
Date:   Thu, 5 Dec 2019 00:18:40 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 02/11] gpiolib: have a single place of calling set_config()

On Wed, Dec 4, 2019 at 6:04 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> Instead of calling the gpiochip's set_config() callback directly and
> checking its existence every time - just add a new routine that performs
> this check internally. Call it in gpio_set_config() and
> gpiod_set_transitory(). Also call it in gpiod_set_debounce() and drop
> the check for chip->set() as it's irrelevant to this config option.
>

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/gpio/gpiolib.c | 21 ++++++++++++---------
>  1 file changed, 12 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a31797fe78fa..72211407469f 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -3042,6 +3042,15 @@ EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
>   * rely on gpio_request() having been called beforehand.
>   */
>
> +static int gpio_do_set_config(struct gpio_chip *gc, unsigned int offset,
> +                             enum pin_config_param mode)
> +{
> +       if (!gc->set_config)
> +               return -ENOTSUPP;
> +
> +       return gc->set_config(gc, offset, mode);
> +}
> +
>  static int gpio_set_config(struct gpio_chip *gc, unsigned int offset,
>                            enum pin_config_param mode)
>  {
> @@ -3060,7 +3069,7 @@ static int gpio_set_config(struct gpio_chip *gc, unsigned int offset,
>         }
>
>         config = PIN_CONF_PACKED(mode, arg);
> -       return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP;
> +       return gpio_do_set_config(gc, offset, mode);
>  }
>
>  static int gpio_set_bias(struct gpio_chip *chip, struct gpio_desc *desc)
> @@ -3294,15 +3303,9 @@ int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
>
>         VALIDATE_DESC(desc);
>         chip = desc->gdev->chip;
> -       if (!chip->set || !chip->set_config) {
> -               gpiod_dbg(desc,
> -                         "%s: missing set() or set_config() operations\n",
> -                         __func__);
> -               return -ENOTSUPP;
> -       }
>
>         config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce);
> -       return chip->set_config(chip, gpio_chip_hwgpio(desc), config);
> +       return gpio_do_set_config(chip, gpio_chip_hwgpio(desc), config);
>  }
>  EXPORT_SYMBOL_GPL(gpiod_set_debounce);
>
> @@ -3339,7 +3342,7 @@ int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
>         packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE,
>                                           !transitory);
>         gpio = gpio_chip_hwgpio(desc);
> -       rc = chip->set_config(chip, gpio, packed);
> +       rc = gpio_do_set_config(chip, gpio, packed);
>         if (rc == -ENOTSUPP) {
>                 dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n",
>                                 gpio);
> --
> 2.23.0
>


-- 
With Best Regards,
Andy Shevchenko