linux-kernel - Re: [PATCH RFC/RFT] pinctrl: qcom: make the pinmuxing strict

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Message-ID: <d92e7c52-eab5-4759-af3f-16b24254bff6@oss.qualcomm.com>
Date: Thu, 26 Jun 2025 21:05:56 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        Bjorn Andersson <andersson@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH RFC/RFT] pinctrl: qcom: make the pinmuxing strict

On 6/25/25 5:37 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> 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.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---

SC8280XP CRD breaks with this.. looks like there's a conflict between
regulator-fixed accessing the pin with gpiod APIs and setting a pinmux:

[    5.095688] sc8280xp-tlmm f100000.pinctrl: pin GPIO_25 already requested by regulator-edp-3p3; cannot claim for f100000.pinctrl:570
[    5.107822] sc8280xp-tlmm f100000.pinctrl: error -EINVAL: pin-25 (f100000.pinctrl:570)


Konrad