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

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Date:   Fri, 13 May 2022 09:57:30 +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 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.

Best regards,
Krzysztof