linux-kernel - Re: (subset) [PATCH RFC/RFT 00/15] gpio: sysfs: add a per-chip export/unexport attribute pair

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Message-ID: <175040464299.26030.15007866194948582213.b4-ty@linaro.org>
Date: Fri, 20 Jun 2025 09:30:49 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>,
	Kent Gibson <warthog618@...il.com>,
	Jan Lübbe <jlu@...gutronix.de>,
	Marek Vasut <marex@...x.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: (subset) [PATCH RFC/RFT 00/15] gpio: sysfs: add a per-chip export/unexport attribute pair

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>


On Tue, 10 Jun 2025 16:38:15 +0200, Bartosz Golaszewski wrote:
> Following our discussion[1], here's a proposal for extending the sysfs
> interface with attributes not referring to GPIO lines by their global
> numbers in a backward compatible way.
> 
> Long story short: there is now a new class device for each GPIO chip.
> It's called chipX where X is the ID of the device as per the driver
> model and it lives next to the old gpiochipABC where ABC is the GPIO
> base. Each new chip class device has a pair of export/unexport
> attributes which work similarly to the global ones under /sys/class/gpio
> but take hardware offsets within the chip as input, instead of the
> global numbers. Finally, each exported line appears at the same time as
> the global /sys/class/gpio/gpioABC as well as per-chip
> /sys/class/gpio/chipX/gpioY sysfs group.
> 
> [...]

Applied, thanks!

[01/15] Documentation: gpio: undocument removed behavior
        https://git.kernel.org/brgl/linux/c/5ed0d32805c19cfa5f03a25ec7e041dc845d3062
[02/15] Documentation: gpio: document the active_low field in the sysfs ABI
        https://git.kernel.org/brgl/linux/c/1ae86030745013d9d54fc287c1ce875f7ddd99e6
[03/15] gpio: sysfs: call mutex_destroy() in gpiod_unexport()
        https://git.kernel.org/brgl/linux/c/e1f02b40a741aac47016765c21b61e91d19aa1ec
[04/15] gpio: sysfs: refactor the coding style
        https://git.kernel.org/brgl/linux/c/dc665b5248f90aa2dc74ecc1f2ebb731a6f5afd6
[05/15] gpio: sysfs: remove unneeded headers
        https://git.kernel.org/brgl/linux/c/982ec96c3876349e65e60c7b4fd91d767099837e
[06/15] gpio: sysfs: remove the mockdev pointer from struct gpio_device
        https://git.kernel.org/brgl/linux/c/fd19792851db77e74cff4e2dc772d25a83cdc34d

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>