linux-kernel - Re: [PATCH RFC 0/9] gpio: improve support for shared GPIOs

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Message-ID: <a9a4f33f-b6c5-4c25-8321-7b08a2afb8a0@sirena.org.uk>
Date: Tue, 7 Oct 2025 14:18:01 +0100
From: Mark Brown <broonie@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Srinivas Kandagatla <srini@...nel.org>, Kees Cook <kees@...nel.org>,
	Mika Westerberg <westeri@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andy@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH RFC 0/9] gpio: improve support for shared GPIOs

On Tue, Oct 07, 2025 at 03:13:29PM +0200, Bartosz Golaszewski wrote:
> On Mon, Oct 6, 2025 at 11:55 PM Srinivas Kandagatla <srini@...nel.org> wrote:

> > Yes, these codec drivers are due to be moved to use reset-gpios.

...

> anything. And what about shared pins other than reset? 'dc-gpios' for
> display, other 'powerdown' instances, 'enable-gpios', all kinds of
> uncommon names like: `dlg,cs`, `wlf,ldo2ena`, `speaker-enable`,
> `maxim,enable`? It's not likely we will create a separate abstraction

Many of which, crucially, don't actually reset the device.

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