linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: msm8996-xiaomi-natrium: Add support for Xiaomi Mi 5s Plus

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Date:   Thu, 19 May 2022 12:01:40 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yassine Oudjana <y.oudjana@...tonmail.com>,
        Andy Gross <agross@...nel.org>
Cc:     Alec Su <ae40515@...oo.com.tw>, bjorn.andersson@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        sboyd@...eaurora.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: msm8996-xiaomi-natrium: Add support
 for Xiaomi Mi 5s Plus

On 19/05/2022 11:57, Yassine Oudjana wrote:
>>
>> There is no such property documented. Either add bindings, or drop.
>>
>>> + qcom,board-id = <47 0>;
>>
>>
>> The same.
> 
> These properties are already used in many device trees; they are
> needed to let the bootloader pick a DTB, but yes they aren't
> documented currently. devicetree/bindings/arm/qcom.yaml would
> probably be a good place to put them.

Which means each person is using them and not caring about
documenting... they need to be documented. I am not even sure if they
should be accepted.

The DTS describes hardware, not bootloader specific details. The
hardware - board - is defined by compatible and bootloader should use
it. Adding new properties because someone decided "I don't like
compatibles" is not appropriate.


Best regards,
Krzysztof