linux-kernel - Re: [PATCH v2 00/10] Introduce configfs-based interface for gpio-aggregator

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Message-ID: <CAMuHMdVoCf2VmgZOtNOPxhpTdYBWEWgCozLM+opaL7wOtF10_A@mail.gmail.com>
Date: Wed, 12 Feb 2025 14:14:23 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Koichiro Den <koichiro.den@...onical.com>
Cc: linux-gpio@...r.kernel.org, brgl@...ev.pl, linus.walleij@...aro.org, 
	maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/10] Introduce configfs-based interface for gpio-aggregator

Hi Den-san,

On Mon, 3 Feb 2025 at 04:12, Koichiro Den <koichiro.den@...onical.com> wrote:
> This patch series introduces a configfs-based interface to gpio-aggregator
> to address limitations in the existing 'new_device' interface.
>
> The existing 'new_device' interface has several limitations:
>
>   #1. No way to determine when GPIO aggregator creation is complete.
>   #2. No way to retrieve errors when creating a GPIO aggregator.
>   #3. No way to trace a GPIO line of an aggregator back to its
>       corresponding physical device.
>   #4. The 'new_device' echo does not indicate which virtual gpiochip<N>
>       was created.
>   #5. No way to assign names to GPIO lines exported through an aggregator.
>
> Although Issue#1 to #3 could technically be resolved easily without
> configfs, using configfs offers a streamlined, modern, and extensible
> approach, especially since gpio-sim and gpio-virtuser already utilize
> configfs.

Thanks for your series!

I gave it a try using all three ways of configuration (sysfs, configs,
DT), and it works fine!

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

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