linux-kernel - Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict

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Message-ID: <CAMRc=MeX58XKmxaY1jYCMdy6fQJf7HWMR8f=DQpeovE8APw=og@mail.gmail.com>
Date: Wed, 3 Sep 2025 14:06:54 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>, Linus Walleij <linus.walleij@...aro.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Alexey Klimov <alexey.klimov@...aro.org>, Lorenzo Bianconi <lorenzo@...nel.org>, 
	Sean Wang <sean.wang@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Paul Cercueil <paul@...pouillou.net>, Kees Cook <kees@...nel.org>, 
	Andy Shevchenko <andy@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...hat.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	Dong Aisheng <aisheng.dong@....com>, Fabio Estevam <festevam@...il.com>, 
	Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, NXP S32 Linux Team <s32@....com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Tony Lindgren <tony@...mide.com>, 
	Haojian Zhuang <haojian.zhuang@...aro.org>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Danilo Krummrich <dakr@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Mark Brown <broonie@...nel.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mips@...r.kernel.org, linux-hardening@...r.kernel.org, 
	linux-mm@...ck.org, imx@...ts.linux.dev, linux-omap@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict

On Wed, Sep 3, 2025 at 1:51 PM Andy Shevchenko
<andriy.shevchenko@...el.com> wrote:
>
> >
> > I don't see why this would stop these patches though, as they don't
> > break anything unless you decide to make your pin controller strict in
> > which situation you'd need to verify which functions can GPIOs anyway.
>
> It can't anyway, Linus already applied :-)
>

This would be the third time he did it so it's not like it's carved in stone.

I see your point but I think we should cross that bridge when we get
there. Shouldn't be too hard, we already have an entry point:
gpiod_request_user() where we could set an additional flag marking the
descriptor as requested by user-space in which case, when we get to
the relevant pinctrl code, it could check this and refuse based on
whether the descriptor was requested from within the kernel or from
outside.

Bart