linux-kernel - Re: [PATCH v4 1/3] dt-bindings: arm: qcom: document qcom,msm-id and qcom,board-id

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Date:   Fri, 24 Jun 2022 11:26:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Clark <robdclark@...il.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] dt-bindings: arm: qcom: document qcom,msm-id and qcom,board-id

On Thu, 23 Jun 2022 12:53:59 +0200, Krzysztof Kozlowski wrote:
> The top level qcom,msm-id and qcom,board-id properties are utilized by
> bootloaders on Qualcomm MSM platforms to determine which device tree
> should be used and passed to the kernel.
> 
> The commit b32e592d3c28 ("devicetree: bindings: Document qcom board
> compatible format") from 2015 was a consensus during discussion about
> upstreaming qcom,msm-id and qcom,board-id fields.  There are however still
> problems with that consensus:
> 1. It was reached 7 years ago but it turned out its implementation did
>    not reach all possible products.
> 
> 2. Initially additional tool (dtbTool) was needed for parsing these
>    fields to create a QCDT image consisting of multiple DTBs, later the
>    bootloaders were improved and they use these qcom,msm-id and
>    qcom,board-id properties directly.
> 
> 3. Extracting relevant information from the board compatible requires
>    this additional tool (dtbTool), which makes the build process more
>    complicated and not easily reproducible (DTBs are modified after the
>    kernel build).
> 
> 4. Some versions of Qualcomm bootloaders expect these properties even
>    when booting with a single DTB.  The community is stuck with these
>    bootloaders thus they require properties in the DTBs.
> 
> Since several upstreamed Qualcomm SoC-based boards require these
> properties to properly boot and the properties are reportedly used by
> bootloaders, document them.
> 
> Link: https://lore.kernel.org/r/a3c932d1-a102-ce18-deea-18cbbd05ecab@linaro.org/
> Co-developed-by: Kumar Gala <galak@...eaurora.org>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  .../devicetree/bindings/arm/qcom.yaml         | 121 +++++++++++++++
>  include/dt-bindings/arm/qcom,ids.h            | 146 ++++++++++++++++++
>  2 files changed, 267 insertions(+)
>  create mode 100644 include/dt-bindings/arm/qcom,ids.h
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/arm/qcom.yaml: properties:qcom,board-id:items: 'oneOf' conditional failed, one must be fixed:
	{'oneOf': [{'maxItems': 2, 'items': [{'description': 'Board ID consisting of three bitfields::\n  - bits 31-24 - Unused\n  - bits 23-16 - Platform Version Major\n  - bits 15-8  - Platform Version Minor\n  - bits 7-0   - Platform Type\nPlatform Type field is an exact match value.  The\nPlatform Major/Minor field is a best match.  The bootloader will\nlook for the closest possible match.\n'}, {'description': 'Subtype ID unique to a Platform Type/Chipset ID.  For a given\nPlatform Type, there will typically only be a single board and the\nsubtype_id will be 0.  However in some cases board variants may\nneed to be distinguished by different subtype_id values.\n'}]}, {'minItems': 4, 'items': [{'const': 8}, {'const': 0}, {'description': 'OnePlus board ID'}, {'description': 'OnePlus subtype ID'}]}]} is not of type 'array'
	{'maxItems': 2, 'items': [{'description': 'Board ID consisting of three bitfields::\n  - bits 31-24 - Unused\n  - bits 23-16 - Platform Version Major\n  - bits 15-8  - Platform Version Minor\n  - bits 7-0   - Platform Type\nPlatform Type field is an exact match value.  The\nPlatform Major/Minor field is a best match.  The bootloader will\nlook for the closest possible match.\n'}, {'description': 'Subtype ID unique to a Platform Type/Chipset ID.  For a given\nPlatform Type, there will typically only be a single board and the\nsubtype_id will be 0.  However in some cases board variants may\nneed to be distinguished by different subtype_id values.\n'}]} should not be valid under {'required': ['maxItems']}
		hint: "maxItems" is not needed with an "items" list
	/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/arm/qcom.yaml: properties:qcom,board-id:items:oneOf:1: 'oneOf' conditional failed, one must be fixed:
		[{'const': 8}, {'const': 0}, {'description': 'OnePlus board ID'}, {'description': 'OnePlus subtype ID'}] is too long
		[{'const': 8}, {'const': 0}, {'description': 'OnePlus board ID'}, {'description': 'OnePlus subtype ID'}] is too short
		False schema does not allow 4
		1 was expected
		4 is greater than the maximum of 2
		4 is greater than the maximum of 3
		hint: "minItems" is only needed if less than the "items" list length
		from schema $id: http://devicetree.org/meta-schemas/items.yaml#
	/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/arm/qcom.yaml: properties:qcom,board-id:items:oneOf:1: 'oneOf' conditional failed, one must be fixed:
		[{'const': 8}, {'const': 0}, {'description': 'OnePlus board ID'}, {'description': 'OnePlus subtype ID'}] is too long
		[{'const': 8}, {'const': 0}, {'description': 'OnePlus board ID'}, {'description': 'OnePlus subtype ID'}] is too short
		False schema does not allow 4
		1 was expected
		4 is greater than the maximum of 2
		4 is greater than the maximum of 3
		hint: "minItems" is only needed if less than the "items" list length
		from schema $id: http://devicetree.org/meta-schemas/items.yaml#
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/arm/qcom.yaml: ignoring, error in schema: properties: qcom,board-id: items
Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.example.dtb:0:0: /: failed to match any schema with compatible: ['arrow,apq8096-db820c', 'qcom,apq8096-sbc', 'qcom,apq8096']
Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.example.dtb:0:0: /: failed to match any schema with compatible: ['arrow,apq8096-db820c', 'qcom,apq8096-sbc', 'qcom,apq8096']
Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.example.dtb:0:0: /: failed to match any schema with compatible: ['arrow,apq8096-db820c', 'qcom,apq8096-sbc', 'qcom,apq8096']

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.