linux-kernel - Re: [PATCH] arm64: dts: qcom: add debug UART pins to reserved GPIO ranges on RB2

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Message-ID: <e211630b-09ff-4267-9507-4d67d58a9257@oss.qualcomm.com>
Date: Mon, 16 Jun 2025 18:46:08 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] arm64: dts: qcom: add debug UART pins to reserved GPIO
 ranges on RB2

On 6/16/25 6:43 PM, Bartosz Golaszewski wrote:
> On Mon, Jun 16, 2025 at 6:20 PM Konrad Dybcio
> <konrad.dybcio@....qualcomm.com> wrote:
>>
>> On 6/16/25 4:33 PM, Bartosz Golaszewski wrote:
>>> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>>
>>> GPIO12 and GPIO13 are used for the debug UART and must not be available
>>> to drivers or user-space. Add them to the gpio-reserved-ranges.
>>>
>>> Fixes: 8d58a8c0d930c ("arm64: dts: qcom: Add base qrb4210-rb2 board dts")
>>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>> ---
>>
>> That also makes them unavailable to the kernel though, no?
>>
> 
> Yes. They could only be used by QUP - I2C or SPI #4 - on sm6115 but
> none of these are used on RB2. I just noticed that my console froze
> when I accidentally requested GPIO12 and figured that it makes sense
> to make them unavailable. Let me know if this should be dropped.

We usually carry an active/sleep pair of pinctrl configs - would they
be affected by these changes?

Konrad