linux-kernel - Re: [PATCH RFC v2 5/6] gpio: aggregator: add possibility to attach data to the forwarder

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Message-ID: <CAMRc=Md9HsE9nOzFGqJ2mrKx--ZbFa0na6cnz_AiHG+5Qi5NTg@mail.gmail.com>
Date: Tue, 18 Mar 2025 14:18:20 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com, 
	DanieleCleri@...on.eu, GaryWang@...on.com.tw
Subject: Re: [PATCH RFC v2 5/6] gpio: aggregator: add possibility to attach
 data to the forwarder

On Mon, Mar 17, 2025 at 4:38 PM Thomas Richard
<thomas.richard@...tlin.com> wrote:
>
> Add a data pointer to store private data in the forwarder.
>
> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
> ---
>  drivers/gpio/gpio-aggregator.c | 6 ++++--
>  include/linux/gpio/gpio-fwd.h  | 3 ++-
>  2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
> index b9026ff2bfdc1..3c78c47ce40ae 100644
> --- a/drivers/gpio/gpio-aggregator.c
> +++ b/drivers/gpio/gpio-aggregator.c
> @@ -556,7 +556,7 @@ int gpiochip_fwd_add_gpio_desc(struct gpiochip_fwd *fwd, struct gpio_desc *desc,
>  }
>  EXPORT_SYMBOL_GPL(gpiochip_fwd_add_gpio_desc);
>
> -int gpiochip_fwd_register(struct gpiochip_fwd *fwd)
> +int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data)
>  {
>         struct gpio_chip *chip = &fwd->chip;
>         struct device *dev = fwd->dev;
> @@ -579,6 +579,8 @@ int gpiochip_fwd_register(struct gpiochip_fwd *fwd)

I see Andy already requested some renaming but can you also use a
gpio_fwd_ prefix for these exported interfaces?

Bart

>         else
>                 spin_lock_init(&fwd->slock);
>
> +       fwd->data = data;
> +
>         error = devm_gpiochip_add_data(dev, chip, fwd);
>
>         return error;
> @@ -625,7 +627,7 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
>                         return ERR_PTR(error);
>         }
>
> -       error = gpiochip_fwd_register(fwd);
> +       error = gpiochip_fwd_register(fwd, NULL);
>         if (error)
>                 return ERR_PTR(error);
>
> diff --git a/include/linux/gpio/gpio-fwd.h b/include/linux/gpio/gpio-fwd.h
> index 80ec34ee282fc..c242cc1888180 100644
> --- a/include/linux/gpio/gpio-fwd.h
> +++ b/include/linux/gpio/gpio-fwd.h
> @@ -10,6 +10,7 @@ struct gpiochip_fwd_timing {
>  struct gpiochip_fwd {
>         struct device *dev;
>         struct gpio_chip chip;
> +       void *data;
>         struct gpio_desc **descs;
>         union {
>                 struct mutex mlock;     /* protects tmp[] if can_sleep */
> @@ -50,6 +51,6 @@ int gpiochip_fwd_add_gpio_desc(struct gpiochip_fwd *fwd,
>                                struct gpio_desc *desc,
>                                unsigned int offset);
>
> -int gpiochip_fwd_register(struct gpiochip_fwd *fwd);
> +int gpiochip_fwd_register(struct gpiochip_fwd *fwd, void *data);
>
>  #endif
>
> --
> 2.39.5
>