linux-kernel - Re: [PATCH v2] dt-bindings: qcom: document preferred compatible naming

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Date:   Mon, 4 Jul 2022 12:32:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
Subject: Re: [PATCH v2] dt-bindings: qcom: document preferred compatible
 naming

On 04/07/2022 12:18, Krzysztof Kozlowski wrote:
> Compatibles can come in two formats.  Either "vendor,ip-soc" or
> "vendor,soc-ip".  Qualcomm bindings were mixing both of usages, so add a
> DT schema file documenting preferred policy and enforcing it for all new
> compatibles, except few existing patterns.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
> Changes since v1:
> 1. Add schema instead of readme (Rob).
> 
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: Alex Elder <elder@...aro.org>
> Cc: Robert Foss <robert.foss@...aro.org>
> Cc: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  .../devicetree/bindings/arm/qcom-soc.yaml     | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/qcom-soc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/qcom-soc.yaml b/Documentation/devicetree/bindings/arm/qcom-soc.yaml
> new file mode 100644
> index 000000000000..1af1f16c13ab
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/qcom-soc.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/qcom-soc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm SoC compatibles naming convention
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> +
> +description: |
> +  Guidelines for new compatibles for SoC blocks/components.
> +  When adding new compatibles in new bindings, use the format::
> +    qcom,SoC-IP
> +
> +  For example::
> +   qcom,sdm845-llcc-bwmon
> +
> +  When adding new compatibles to existing bindings, use the format in the
> +  existing binding, even if it contradicts the above.
> +
> +select:
> +  properties:
> +    compatible:
> +      pattern: "^qcom,.*(apq|ipq|mdm|msm|qcs|sa|sc|sdm|sdx|sm)[0-9]+.*$"
> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - description: Preferred naming style for compatibles of SoC components
> +        pattern: "^qcom,(apq|ipq|mdm|msm|qcs|sa|sc|sdm|sdx|sm)[0-9]+.*$"

This pattern should be stricter - followed by '-':
"^qcom,(apq|ipq|mdm|msm|qcs|sa|sc|sdm|sdx|sm)[0-9]+-.*$"

and additional pattern added for a variant (or maybe few):
"^qcom,msm[0-9]+pro-.*$"

This way also compatibles like "qcom,sdm630whatever" will be caught.

Best regards,
Krzysztof