linux-kernel - Re: [PATCH v9 1/1] gpio: add sloppy logic analyzer using polling

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Date: Tue, 18 Jun 2024 20:58:11 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Arnd Bergmann <arnd@...db.de>, Linus Walleij <linus.walleij@...aro.org>, 
	Linux-Renesas <linux-renesas-soc@...r.kernel.org>, Jonathan Corbet <corbet@....net>, 
	Kent Gibson <warthog618@...il.com>, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v9 1/1] gpio: add sloppy logic analyzer using polling

Hi Wolfram,

On Tue, Jun 18, 2024 at 12:54 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> > I could see it using configfs instead of DT for configuration and iio
> > for presenting the output but - from what Wolfram said - insisting on
> > this will simply result in this development being dropped entirely.
>
> How do you assign a GPIO via debugfs? I only found the out-of-tree
> pwm-gpio driver[1] which uses a GPIO number. But those are deprecated
> these days, or? Any other driver doing this you can point me to?

Do you really need debugfs (or configfs)?
I guess you can just write GPIO line names or GPIO chip
labels + offsets to the new_device file, like gpio-aggregator does?

Documentation/admin-guide/gpio/gpio-aggregator.rst

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