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

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Den-san,

On Mon, 3 Feb 2025 at 04:12, Koichiro Den <koichiro.den@xxxxxxxxxxxxx> 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@xxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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