Re: [PATCH v2 00/10] Introduce configfs-based interface for gpio-aggregator
From: Geert Uytterhoeven
Date: Wed Feb 12 2025 - 08:15:09 EST
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