linux-kernel - Re: [PATCH v1 1/3] gpiolib: Split out for_each_gpio

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Date:   Tue, 5 Apr 2022 14:21:42 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v1 1/3] gpiolib: Split out for_each_gpio_desc() macro

On Wed, Mar 30, 2022 at 4:59 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> In some cases we want to traverse all GPIO descriptors for given
> chip, let's split out for_each_gpio_desc() macro for such cases.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/gpio/gpiolib.c | 10 +++-------
>  drivers/gpio/gpiolib.h |  7 +++++--
>  2 files changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index e59884cc12a7..723411c13f1c 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -310,15 +310,11 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name)
>         spin_lock_irqsave(&gpio_lock, flags);
>
>         list_for_each_entry(gdev, &gpio_devices, list) {
> +               struct gpio_desc *desc;
>                 int i;
>
> -               for (i = 0; i != gdev->ngpio; ++i) {
> -                       struct gpio_desc *desc = &gdev->descs[i];
> -
> -                       if (!desc->name)
> -                               continue;
> -
> -                       if (!strcmp(desc->name, name)) {
> +               for_each_gpio_desc(i, gdev->chip, desc) {
> +                       if (desc->name && !strcmp(desc->name, name)) {
>                                 spin_unlock_irqrestore(&gpio_lock, flags);
>                                 return desc;
>                         }
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index 06f3faa9fbef..450fb2fabe43 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -100,10 +100,13 @@ struct gpio_array {
>
>  struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
>
> -#define for_each_gpio_desc_with_flag(i, gc, desc, flag)                \
> +#define for_each_gpio_desc(i, gc, desc)                                \

While at it: how about declaring the i variable in the loop definition?

Bart

>         for (i = 0, desc = gpiochip_get_desc(gc, i);            \
>              i < gc->ngpio;                                     \
> -            i++, desc = gpiochip_get_desc(gc, i))              \
> +            i++, desc = gpiochip_get_desc(gc, i))
> +
> +#define for_each_gpio_desc_with_flag(i, gc, desc, flag)                \
> +       for_each_gpio_desc(i, gc, desc)                         \
>                 if (!test_bit(flag, &desc->flags)) {} else
>
>  int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> --
> 2.35.1
>