[PATCH v9 10/20] dt-bindings: riscv: add Counter delegation ISA extensions description

[Anup Patel]

On Fri, Aug 7, 2026 at 1:39 PM Atish Patra <atish.patra at linux.dev> wrote:
>
> From: Atish Patra <atishp at rivosinc.com>
>
> Add description for the Smcdeleg/Ssccfg extension.
>
> Signed-off-by: Atish Patra <atishp at rivosinc.com>
> Acked-by: Conor Dooley <conor.dooley at microchip.com>
> Link: https://patch.msgid.link/20260701-counter_delegation-v8-10-7909f863a645@meta.com
> Signed-off-by: Paul Walmsley <pjw at kernel.org>

LGTM.

Reviewed-by: Anup Patel <anup at brainfault.org>

Regards,
Anup


> ---
>  .../devicetree/bindings/riscv/extensions.yaml      | 41 ++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> index eee65cf73d6c..24efd3e1cf8e 100644
> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> @@ -181,6 +181,13 @@ properties:
>              changes to interrupts as frozen at commit ccbddab ("Merge pull
>              request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
>
> +        - const: smcdeleg
> +          description: |
> +            The standard Smcdeleg machine-level extension for the machine mode
> +            to delegate the hpmcounters to supervisor mode so that they are
> +            directly accessible in the supervisor mode as ratified in the
> +            20240213 version of the privileged ISA specification.
> +
>          - const: smcntrpmf
>            description: |
>              The standard Smcntrpmf machine-level extension for the machine mode
> @@ -220,6 +227,14 @@ properties:
>              behavioural changes to interrupts as frozen at commit ccbddab
>              ("Merge pull request #42 from riscv/jhauser-2023-RC4") of riscv-aia.
>
> +        - const: ssccfg
> +          description: |
> +            The standard Ssccfg supervisor-level extension for configuring
> +            the delegated hpmcounters to be accessible directly in supervisor
> +            mode as ratified in the 20240213 version of the privileged ISA
> +            specification. This extension depends on Sscsrind, Smcdeleg, Zihpm,
> +            Zicntr extensions.
> +
>          - const: ssccptr
>            description: |
>              The standard Ssccptr extension for main memory (cacheability and
> @@ -1135,6 +1150,32 @@ properties:
>              allOf:
>                - const: zilsd
>                - const: zca
> +      # Smcdeleg depends on Sscsrind, Zihpm, Zicntr
> +      - if:
> +          contains:
> +            const: smcdeleg
> +        then:
> +          allOf:
> +            - contains:
> +                const: sscsrind
> +            - contains:
> +                const: zihpm
> +            - contains:
> +                const: zicntr
> +      # Ssccfg depends on Smcdeleg, Sscsrind, Zihpm, Zicntr
> +      - if:
> +          contains:
> +            const: ssccfg
> +        then:
> +          allOf:
> +            - contains:
> +                const: smcdeleg
> +            - contains:
> +                const: sscsrind
> +            - contains:
> +                const: zihpm
> +            - contains:
> +                const: zicntr
>
>  allOf:
>    # Zcf extension does not exist on rv64
>
> --
> 2.53.0-Meta
>