Re: [PATCH v3] dt-bindings: renesas: Document preferred compatible naming

[Rob Herring <robh@kernel.org>]

On Tue, Feb 13, 2024 at 08:23:40PM +0100, Niklas Söderlund wrote:
> Compatibles can come in two formats. Either "vendor,ip-soc" or
> "vendor,soc-ip". Add a DT schema file documenting Renesas preferred
> policy and enforcing it for all new compatibles, except few existing
> patterns.
> 
> Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
> * Changes since v2
> - Improve the select so it matches on any compatible containing a
>   component specific Renesas value.
> - Make the regexps more compact.
> - Define MaxItems to allow the increased selection to work.
> - Add rmobile and shmobile prefixes.
> - I did not take Rob's ack from v2 as the schema changed a lot after
>   Geerts review.
> 
> * Changes since v1
> - Split the "SoC agnostic compatibles" section into two to make it's
>   intent clearer.
> - Improved the documentation for each group of compatibles.
> - Reduced the number of regexp to create a larger target area. As
>   suggested by Krzysztof the goal is not to validate each SoC name but
>   check for the correct order of SoC-IP.
> 
> * Changes since RFC
> - Moved to Documentation/devicetree/bindings/soc/renesas.
> - Changed the pattern in the initial select to match on .*-.*.
> - Added a lot of missing compatible values.
> ---
>  .../bindings/soc/renesas/renesas-soc.yaml     | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml b/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml
> new file mode 100644
> index 000000000000..57c11022d793
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/renesas/renesas-soc.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/renesas/renesas-soc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas SoC compatibles naming convention
> +
> +maintainers:
> +  - Geert Uytterhoeven <geert+renesas@glider.be>
> +  - Niklas Söderlund <niklas.soderlund@ragnatech.se>
> +
> +description: |
> +  Guidelines for new compatibles for SoC blocks/components.
> +  When adding new compatibles in new bindings, use the format::
> +    renesas,SoC-IP
> +
> +  For example::
> +   renesas,r8a77965-csi2
> +
> +  When adding new compatibles to existing bindings, use the format in the
> +  existing binding, even if it contradicts the above.
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        pattern: "^renesas,.+-.+$"
> +  required:
> +    - compatible
> +
> +properties:
> +  compatible:
> +    maxItems: 4

'minItems: 1' should fix the error reported.


> +    items:
> +      anyOf:
> +        # Preferred naming style for compatibles of SoC components
> +        - pattern: "^renesas,(emev2|r(7s|8a|9a)[a-z0-9]+|rcar|rmobile|rz[a-z0-9]*|sh(7[a-z0-9]+)?|mobile)-[a-z0-9-]+$"
> +        - pattern: "^renesas,(condor|falcon|gr-peach|salvator|sk-rz|smar(c(2)?)?|spider|white-hawk)(.*)?$"
> +
> +        # Legacy compatibles
> +        #
> +        # New compatibles are not allowed.
> +        - pattern: "^renesas,(can|cpg|dmac|du|(g)?ether(avb)?|gpio|hscif|(r)?i[i2]c|imr|intc|ipmmu|irqc|jpu|mmcif|msiof|mtu2|pci(e)?|pfc|pwm|[rq]spi|rcar_sound|sata|scif[ab]*|sdhi|thermal|tmu|tpu|usb(2|hs)?|vin|xhci)-[a-z0-9-]+$"
> +        - pattern: "^renesas,(d|s)?bsc(3)?-(r8a73a4|r8a7740|sh73a0)$"
> +        - pattern: "^renesas,em-(gio|sti|uart)$"
> +        - pattern: "^renesas,fsi2-(r8a7740|sh73a0)$"
> +        - pattern: "^renesas,hspi-r8a777[89]$"
> +        - pattern: "^renesas,sysc-(r8a73a4|r8a7740|rmobile|sh73a0)$"
> +        - enum:
> +            - renesas,imr-lx4
> +            - renesas,mtu2-r7s72100
> +
> +        # None SoC component compatibles
> +        #
> +        # Compatibles with the Renesas vendor prefix that do not relate to any SoC
> +        # component are OK. New compatibles are allowed.
> +        - enum:
> +            - renesas,smp-sram
> +
> +        # Do not fail compatibles not matching the select pattern
> +        #
> +        # Some SoC components in addition to a Renesas compatible list
> +        # compatibles not related to Renesas. The select pattern for this
> +        # schema hits all compatibles that have at lest one Renesas compatible
> +        # and try to validate all values in that compatible array, allow all
> +        # that don't match the schema select pattern. For example,
> +        #
> +        #   compatible = "renesas,r9a07g044-mali", "arm,mali-bifrost";
> +        - pattern: "^(?!renesas,.+-.+).+$"
> +
> +additionalProperties: true
> -- 
> 2.43.0
>