linux-kernel - Re: [PATCH v4] gpio: pisosr: Use devm_gpiochip_add

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Date:   Thu, 13 Jul 2023 23:49:43 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Andrew Davis <afd@...com>
Cc:     Peter Tyser <ptyser@...-inc.com>,
        Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] gpio: pisosr: Use devm_gpiochip_add_data() to simplify
 remove path

On Thu, Jul 13, 2023 at 11:20 PM Andrew Davis <afd@...com> wrote:
>
> Use devm version of gpiochip add function to handle removal for us.
>
> While here update copyright and module author.

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

> Signed-off-by: Andrew Davis <afd@...com>
> ---
>
> Changes from v3:
>  - Do not cast void * lock explicitly
>  - Rebase on v6.5-rc1
>
> Changes from v2:
>  - Rebase on v6.4-rc2
>
> Changes from v1:
>  - Use devm to cleanup mutex
>
>  drivers/gpio/gpio-pisosr.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpio/gpio-pisosr.c b/drivers/gpio/gpio-pisosr.c
> index 67071bea08c26..e3013e778e151 100644
> --- a/drivers/gpio/gpio-pisosr.c
> +++ b/drivers/gpio/gpio-pisosr.c
> @@ -1,7 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0-only
>  /*
> - * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> - *     Andrew F. Davis <afd@...com>
> + * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
> + *     Andrew Davis <afd@...com>
>   */
>
>  #include <linux/bitmap.h>
> @@ -116,6 +116,11 @@ static const struct gpio_chip template_chip = {
>         .can_sleep              = true,
>  };
>
> +static void pisosr_mutex_destroy(void *lock)
> +{
> +       mutex_destroy(lock);
> +}
> +
>  static int pisosr_gpio_probe(struct spi_device *spi)
>  {
>         struct device *dev = &spi->dev;
> @@ -126,8 +131,6 @@ static int pisosr_gpio_probe(struct spi_device *spi)
>         if (!gpio)
>                 return -ENOMEM;
>
> -       spi_set_drvdata(spi, gpio);
> -
>         gpio->chip = template_chip;
>         gpio->chip.parent = dev;
>         of_property_read_u16(dev->of_node, "ngpios", &gpio->chip.ngpio);
> @@ -145,8 +148,11 @@ static int pisosr_gpio_probe(struct spi_device *spi)
>                                      "Unable to allocate load GPIO\n");
>
>         mutex_init(&gpio->lock);
> +       ret = devm_add_action_or_reset(dev, pisosr_mutex_destroy, &gpio->lock);
> +       if (ret)
> +               return ret;
>
> -       ret = gpiochip_add_data(&gpio->chip, gpio);
> +       ret = devm_gpiochip_add_data(dev, &gpio->chip, gpio);
>         if (ret < 0) {
>                 dev_err(dev, "Unable to register gpiochip\n");
>                 return ret;
> @@ -155,15 +161,6 @@ static int pisosr_gpio_probe(struct spi_device *spi)
>         return 0;
>  }
>
> -static void pisosr_gpio_remove(struct spi_device *spi)
> -{
> -       struct pisosr_gpio *gpio = spi_get_drvdata(spi);
> -
> -       gpiochip_remove(&gpio->chip);
> -
> -       mutex_destroy(&gpio->lock);
> -}
> -
>  static const struct spi_device_id pisosr_gpio_id_table[] = {
>         { "pisosr-gpio", },
>         { /* sentinel */ }
> @@ -182,11 +179,10 @@ static struct spi_driver pisosr_gpio_driver = {
>                 .of_match_table = pisosr_gpio_of_match_table,
>         },
>         .probe = pisosr_gpio_probe,
> -       .remove = pisosr_gpio_remove,
>         .id_table = pisosr_gpio_id_table,
>  };
>  module_spi_driver(pisosr_gpio_driver);
>
> -MODULE_AUTHOR("Andrew F. Davis <afd@...com>");
> +MODULE_AUTHOR("Andrew Davis <afd@...com>");
>  MODULE_DESCRIPTION("SPI Compatible PISO Shift Register GPIO Driver");
>  MODULE_LICENSE("GPL v2");
> --
> 2.39.2
>


-- 
With Best Regards,
Andy Shevchenko