linux-kernel - Re: [PATCH] gpio: aggregator: restore the set

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Message-ID: <CAMuHMdX5HXx2HSAHP-H1EEKO-csBku_cMm-OaacE7GZLXwBxOg@mail.gmail.com>
Date: Mon, 29 Sep 2025 12:15:15 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH] gpio: aggregator: restore the set_config operation

Hi Thomas,

On Mon, 29 Sept 2025 at 12:03, Thomas Richard
<thomas.richard@...tlin.com> wrote:
> Restore the set_config operation, as it was lost during the refactoring of
> the gpio-aggregator driver while creating the gpio forwarder library.
>
> Fixes: b31c68fd851e7 ("gpio: aggregator: handle runtime registration of gpio_desc in gpiochip_fwd")
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202509281206.a7334ae8-lkp@intel.com
> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>

Thanks for your patch!

> --- a/drivers/gpio/gpio-aggregator.c
> +++ b/drivers/gpio/gpio-aggregator.c
> @@ -723,6 +723,7 @@ struct gpiochip_fwd *devm_gpiochip_fwd_alloc(struct device *dev,
>         chip->get_multiple = gpio_fwd_get_multiple_locked;
>         chip->set = gpio_fwd_set;
>         chip->set_multiple = gpio_fwd_set_multiple_locked;
> +       chip->set_config = gpio_fwd_set_config;
>         chip->to_irq = gpio_fwd_to_irq;
>         chip->base = -1;
>         chip->ngpio = ngpios;
>

Is there any specific reason why you are doing this unconditionally,
instead of only when any of its parents support .set_config(), like
was done before?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds