linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: sdm845-db845c: correct SPI2 pins drive strength

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Message-ID: <92bd8960-7b50-46c2-3374-9d0e0237c985@linaro.org>
Date:   Tue, 4 Oct 2022 08:51:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Clark <robdclark@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        "# 4.0+" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/3] arm64: dts: qcom: sdm845-db845c: correct SPI2 pins
 drive strength

On 04/10/2022 01:03, Doug Anderson wrote:
>>> If this really has to be one-off then the subnode shouldn't be called
>>> "pinmux". A subnode called "pinmux" implies that it just has muxing
>>> information in it. After your patch this is called "pinmux" but has
>>> _configuration_ in it.
>>>
>>
>> It is a poor argument to keep some convention which is both
>> undocumented, not kept in this file and known only to some folks
>> (although that's effect of lack of documentation). Even the bindings do
>> not say it should be "pinconf" but they mention "config" in example. The
>> existing sdm845.dts uses config - so why now there should be "pinconf"?
>> By this "convention" we have both "pinmux" and "mux", perfect. Several
>> other pins do not have pinmux/mux/config at all.
>>
>> This convention was never implemented, so there is nothing to keep/match.
>>
>> Changing it to "config" (because this is the most used "convention" in
>> the file and bindings) would also mean to add useless "pins" which will
>> be in next patch removed.
> 
> I certainly won't make the argument that the old convention was great
> or even that consistently followed. That's why it changed. ...but to
> me it's more that a patch should stand on its own and not only make
> sense in the context of future patches. After applying ${SUBJECT}
> patch you end up with a node called "pinmux" that has more than just
> muxing information in it. That seems less than ideal.

OK, let me make it part of "config" then to match other nodes from DTSI.

Best regards,
Krzysztof