linux-kernel - Re: [PATCH 1/3] dt-bindings: arm: qcom: Add sc7180 Chromebook board bindings

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Date:   Fri, 13 May 2022 11:00:56 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        "Joseph S . Barrera III" <joebar@...omium.org>,
        Julius Werner <jwerner@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: arm: qcom: Add sc7180 Chromebook board
 bindings

On 13/05/2022 09:57, Krzysztof Kozlowski wrote:
> On 12/05/2022 18:04, Douglas Anderson wrote:
>> This copy-pastes compatibles from sc7180-based boards from the device
>> trees to the yaml file so that `make dtbs_check` will be happy.
>>
>> NOTES:
>> - I make no attempt to try to share an "item" for all sc7180 based
>>   Chromebooks. Because of the revision matching scheme used by the
>>   Chromebook bootloader, at times we need a different number of
>>   revisions listed.
>> - Some of the odd entries in here (like google,homestar-rev23 or the
>>   fact that "Google Lazor Limozeen without Touchscreen" changed from
>>   sku5 to sku6) are not typos but simply reflect reality.
>> - Many revisions of boards here never actually went to consumers, but
>>   they are still in use within various companies that were involved in
>>   Chromebook development. Since Chromebooks are developed with an
>>   "upstream first" methodology, having these revisions supported with
>>   upstream Linux is important. Making it easy for Chromebooks to be
>>   developed with an "upstream first" methodology is valuable to the
>>   upstream community because it improves the quality of upstream and
>>   gets Chromebooks supported with vanilla upstream faster.
>>
>> Signed-off-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>
>>  .../devicetree/bindings/arm/qcom.yaml         | 180 ++++++++++++++++++
>>  1 file changed, 180 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/qcom.yaml b/Documentation/devicetree/bindings/arm/qcom.yaml
>> index 5c06d1bfc046..399be67eb5d2 100644
>> --- a/Documentation/devicetree/bindings/arm/qcom.yaml
>> +++ b/Documentation/devicetree/bindings/arm/qcom.yaml
>> @@ -214,11 +214,191 @@ properties:
>>                - qcom,ipq8074-hk10-c2
>>            - const: qcom,ipq8074
>>  
>> +      # Qualcomm Technologies, Inc. SC7180 IDP
>>        - items:
>>            - enum:
>>                - qcom,sc7180-idp
>>            - const: qcom,sc7180
>>  
>> +      # Google CoachZ (rev1 - 2)
>> +      - items:
>> +          - const: google,coachz-rev1
>> +          - const: google,coachz-rev2
> 
> The inverted pattern of old revision being compatible with the new one,
> is done on purpose? You claim here every rev1 is always compatible with
> rev2 ...
> 
> I don't think we discussed such patterns in previous talk. I quickly
> went through it and there were only skuX moving around, not rev1 being
> newer then rev2.

BTW, your other Chromebooks use logical order:

https://lore.kernel.org/all/20220512205602.158273-2-nfraprado@collabora.com/




Best regards,
Krzysztof