Re: [PATCH v2 03/10] gpio: raspberrypi-exp: Release firmware handle on unbind

[Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>]

On Thu, Oct 22, 2020 at 5:59 PM Nicolas Saenz Julienne
<nsaenzjulienne@xxxxxxx> wrote:
>
> Upon unbinding the device make sure we release RPi's firmware interface.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
> ---
>  drivers/gpio/gpio-raspberrypi-exp.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-raspberrypi-exp.c b/drivers/gpio/gpio-raspberrypi-exp.c
> index bb100e0124e6..c008336e1131 100644
> --- a/drivers/gpio/gpio-raspberrypi-exp.c
> +++ b/drivers/gpio/gpio-raspberrypi-exp.c
> @@ -231,8 +231,19 @@ static int rpi_exp_gpio_probe(struct platform_device *pdev)
>         rpi_gpio->gc.get = rpi_exp_gpio_get;
>         rpi_gpio->gc.set = rpi_exp_gpio_set;
>         rpi_gpio->gc.can_sleep = true;
> +       platform_set_drvdata(pdev, rpi_gpio);
>
> -       return devm_gpiochip_add_data(dev, &rpi_gpio->gc, rpi_gpio);
> +       return gpiochip_add_data(&rpi_gpio->gc, rpi_gpio);
> +}
> +
> +static int rpi_exp_gpio_remove(struct platform_device *pdev)
> +{
> +       struct rpi_exp_gpio *rpi_gpio = platform_get_drvdata(pdev);
> +
> +       gpiochip_remove(&rpi_gpio->gc);
> +       rpi_firmware_put(rpi_gpio->fw);
> +
> +       return 0;
>  }
>
>  static const struct of_device_id rpi_exp_gpio_ids[] = {
> @@ -247,6 +258,7 @@ static struct platform_driver rpi_exp_gpio_driver = {
>                 .of_match_table = of_match_ptr(rpi_exp_gpio_ids),
>         },
>         .probe  = rpi_exp_gpio_probe,
> +       .remove = rpi_exp_gpio_remove,
>  };
>  module_platform_driver(rpi_exp_gpio_driver);
>
> --
> 2.28.0
>

Why not introduce devm_rpi_firmware_get()? That would allow you to
keep the driver elegant without re-adding remove().

Bartosz