linux-kernel - Re: [PATCH v3 00/10] gpio: sysfs: add a per-chip export/unexport attribute pair

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Message-ID: <CACRpkdYD5nT=f-uCARniUvBScu2gA+oY7ALgjYrdX-T_XRxEVg@mail.gmail.com>
Date: Fri, 4 Jul 2025 10:21:45 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>, Kent Gibson <warthog618@...il.com>, 
	Ahmad Fatoum <a.fatoum@...gutronix.de>, Jan Lübbe <jlu@...gutronix.de>, 
	Marek Vasut <marex@...x.de>, Geert Uytterhoeven <geert+renesas@...der.be>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 00/10] gpio: sysfs: add a per-chip export/unexport
 attribute pair

On Wed, Jul 2, 2025 at 3:19 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> Whatever your opinion on this is - if user-space wants to keep the
> interface, then we need to support it. We can only propose
> alternatives and hope the users will switch. Please read the
> discussion, it explains why people want to keep using the simple sysfs
> ABI and why those specific users will most likely never switch to the
> character device. At this point a bigger concern to me is the global
> GPIO numberspace, not the existence of the sysfs class as such.

I agree with Bart here, the global GPIO numberspace is the big
problem we need to get rid of, if we move users over to the new
sysfs ABI and disable and finally delete the old one, we can get
rid of the global GPIO numberspace.

This will be needed to conclude the work inside the kernel do
move everyone and their dog over to using GPIO descriptors
instead of numbers.

We would maybe be able to delete <linux/gpio.h> but without
also getting rid of the global numberspace it will feel very
incomplete.

Yours,
Linus Walleij