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

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Date: Tue, 18 Jun 2024 21:46:38 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>, 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

On Tue, Jun 18, 2024 at 8:58 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> 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
>

IMO that adds a lot of custom string parsing in kernel for no reason.
TBH Today I'd NAK this interface and propose configfs instead as well.

Bart

> 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