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

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Message-ID: <0bd2f438-6151-442a-9ce3-77624e74682d@sirena.org.uk>
Date: Tue, 21 Oct 2025 16:02:46 +0100
From: Mark Brown <broonie@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: 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>,
	Srinivas Kandagatla <srini@...nel.org>, Kees Cook <kees@...nel.org>,
	Mika Westerberg <westeri@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Catalin Marinas <catalin.marinas@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Takashi Iwai <tiwai@...e.com>, Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andy@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Will Deacon <will@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH RFC 0/9] gpio: improve support for shared GPIOs

On Tue, Oct 21, 2025 at 04:42:11PM +0200, Bartosz Golaszewski wrote:
> On Tue, Oct 21, 2025 at 4:08 PM Mark Brown <broonie@...nel.org> wrote:

> > I'm not sure I see the need for deferred notifications?  We'd need to go
> > round all the users whenever a physical change to the GPIO happens but
> > it's not clear what we'd need to store beyond the list of users?

> In my mind I was thinking that we only need to send the notifications
> to users who already enabled/disabled the regulator too but you're
> right, it seems like a loop over the relevant pins should be enough.

Ah, great - yeah, I'd expect notifications either way just to be on the
safe side.

> In any case: this is outside the scope of this series but I'll see if
> it's easy enough to add separately.

Yes, definitely outside the scope of the series.  If you do something
that'd be great but no pressure.

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