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

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Message-ID: <713cd518-935f-4501-9753-d33c9ea6aef7@oss.qualcomm.com>
Date: Mon, 16 Jun 2025 18:20:48 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        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>
Cc: 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 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?

Konrad