On Wed, Jul 01, 2026 at 08:52:21AM -0400, Guodong Xu wrote:
> Zicbom, Zicbop, and Zicboz have no default cache block size, so a
> devicetree that declares one must also provide the matching
> riscv,cbom/cbop/cboz-block-size property. Make it required so a
> missing block-size property can be caught by dtbs_check.
> 
> Suggested-by: Conor Dooley <conor.dooley@microchip.com>
> Signed-off-by: Guodong Xu <docular.xu@gmail.com>
> ---
> v5: New patch.
> ---
>  .../devicetree/bindings/riscv/extensions.yaml      | 26 ++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> index 5ffc40d599c02..f4dd34d446c02 100644
> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> @@ -1142,6 +1142,32 @@ allOf:
>            not:
>              contains:
>                const: zilsd
> +  # All three Zicbo* extensions require their block size property as there's no
> +  # default.
> +  - if:
> +      properties:
> +        riscv,isa-extensions:
> +          contains:
> +            const: zicbom

I think the way to fix this is to add
  required:
    - riscv,isa-extensions
to each of these if conditions
(not got time to test it right now, sorry)

> +    then:
> +      required:
> +        - riscv,cbom-block-size
> +  - if:
> +      properties:
> +        riscv,isa-extensions:
> +          contains:
> +            const: zicbop
> +    then:
> +      required:
> +        - riscv,cbop-block-size
> +  - if:
> +      properties:
> +        riscv,isa-extensions:
> +          contains:
> +            const: zicboz
> +    then:
> +      required:
> +        - riscv,cboz-block-size
>  
>  additionalProperties: true
>  ...
> 
> -- 
> 2.43.0
>