linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sdm845: align TLMM pin configuration with DT schema

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Date:   Fri, 30 Sep 2022 22:19:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: sdm845: align TLMM pin
 configuration with DT schema

On 30/09/2022 22:13, Konrad Dybcio wrote:
> 
> 
> On 30.09.2022 22:05, Krzysztof Kozlowski wrote:
>> DT schema expects TLMM pin configuration nodes to be named with
>> '-state' suffix and their optional children with '-pins' suffix.
>>
>> The sdm854.dtsi file defined several pin configuration nodes which are
> 845
> 
>> customized by the boards.  Therefore keep a additional "default-pins"
>> node inside so the boards can add more of configuration nodes.  Such
>> additional configuration nodes always need 'function' property now
>> (required by DT schema).
> Would it not make more sense to drop this and keep the properties in the
> root node while at it?
> 
> Konrad

Not possible, because the boards set different bias/config for the pins:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/sdm845.dtsi?h=v6.0-rc7#n2988

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/sdm845-mtp.dts?h=v6.0-rc7#n729

Best regards,
Krzysztof