linux-kernel - Re: [PATCH RFC 0/5] pinctrl: introduce the concept of a GPIO pin function category

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Message-ID: <5a58fb6d-8ddb-4835-9da9-4c449825367f@oss.qualcomm.com>
Date: Wed, 2 Jul 2025 13:03:11 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Alexey Klimov <alexey.klimov@...aro.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH RFC 0/5] pinctrl: introduce the concept of a GPIO pin
 function category

On 7/2/25 10:45 AM, Bartosz Golaszewski wrote:
> Note: this really is an RFC. Please don't spend too much time revieweing
> the code in detail. I'd like to figure out if that's a good approach at
> all first. Also: while I tested it on sm8650-qrd and sc8280xp-crd, the
> last patch cannot be applied until all Qualcomm platforms are converted.
> 
> Problem: when pinctrl core binds pins to a consumer device and the
> pinmux ops of the underlying driver are marked as strict, the pin in
> question can no longer be requested as a GPIO using the GPIO descriptor
> API. It will result in the following error:
> 
> [    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)

I can confirm the above no longer appears on the same SC8280XP CRD with
this series applied

Konrad