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

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Message-ID: <aLgW7J-j4nn0u8uo@smile.fi.intel.com>
Date: Wed, 3 Sep 2025 13:22:36 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
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	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>,
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	Mark Brown <broonie@...nel.org>, linux-gpio@...r.kernel.org,
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	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 03, 2025 at 09:33:34AM +0200, Bartosz Golaszewski wrote:
> On Tue, Sep 2, 2025 at 10:46 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Tue, Sep 2, 2025 at 8:42 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > > On Tue, Sep 2, 2025 at 4:38 PM Andy Shevchenko
> > > <andriy.shevchenko@...el.com> wrote:
> > > > On Tue, Sep 02, 2025 at 01:59:25PM +0200, Bartosz Golaszewski wrote:

...

> > > > > The strict flag in struct pinmux_ops disallows the usage of the same pin
> > > > > as a GPIO and for another function. Without it, a rouge user-space
> > > > > process with enough privileges (or even a buggy driver) can request a
> > > > > used pin as GPIO and drive it, potentially confusing devices or even
> > > > > crashing the system. Set it globally for all pinctrl-msm users.
> > > >
> > > > How does this keep (or allow) I²C generic recovery mechanism to work?
> 
> Anyway, what is your point? I don't think it has any impact on this.

If we have a group of pins that are marked as I²C, and we want to use recovery
via GPIOs, would it be still possible to request as GPIO when controller driver
is in the strict mode?

-- 
With Best Regards,
Andy Shevchenko