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

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Message-ID: <3ec07506-cfd6-e0af-f8fc-8a8a58ef0c79@linaro.org>
Date:   Fri, 24 Jun 2022 19:56:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rob Herring <robh@...nel.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 24/06/2022 19:26, Rob Herring wrote:
> 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#

Eh, I did not see it on dtschema v2022.05-2-g4af6db61ac2b

This one I can remove.

> 	/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

However this one I need.

Without the minItems:4, the
arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi matches both
conditions of oneOf.

The DTS looks like:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi?id=92f20ff72066d8d7e2ffb655c2236259ac9d1c5d#n24

But I think I can code it differently:
oneOf
  - items
      - items
        - foo
        - bar
  - items
      - items
        - foo
        - bar
        - baz
        - faz


> 		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.
> 


Best regards,
Krzysztof