Re: [RFC PATCH 1/3] dt-bindings: riscv: Add Sspesa and Ssplcofi extensions

[Mayuresh Chitale]

On Tue, Aug 18, 2026 at 3:05 PM Conor Dooley <conor@xxxxxxxxxx> wrote:
>
> On Mon, Aug 17, 2026 at 09:32:17PM +0530, Mayuresh Chitale wrote:
> > Document the RISC-V Performance Event Sampling extensions Sspesa
> > (Precise Event Sample Attribution) and Ssplcofi (Precise Local Counter
> > Overflow Interrupt) in the ISA extensions binding.
> >
> > Add a dependency rule requiring Sspesa to be present whenever Ssplcofi
> > is present.
> >
> > Signed-off-by: Mayuresh Chitale <mayuresh.chitale@xxxxxxxxxxxxxxxx>
>
> Why is this series RFC?
It's because the spec is still in draft stage and also the register
addresses have yet to be assigned.

Thanks,
Mayuresh.
>

> Cheers,
> Conor.
>
> > ---
> >  .../devicetree/bindings/riscv/extensions.yaml | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > index 5ffc40d599c0..f316b93754ff 100644
> > --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> > +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> > @@ -232,6 +232,18 @@ properties:
> >              ratified at commit d70011dde6c2 ("Update to ratified state")
> >              of riscv-j-extension.
> >
> > +        - const: sspesa
> > +          description: |
> > +            The standard Sspesa supervisor-level extension for precise event
> > +            sample attribution, as defined in the RISC-V Performance Event
> > +            Sampling specification.
> > +
> > +        - const: ssplcofi
> > +          description: |
> > +            The standard Ssplcofi supervisor-level extension for precise local
> > +            counter overflow interrupts, as defined in the RISC-V Performance
> > +            Event Sampling specification. Ssplcofi depends on Sspesa.
> > +
> >          - const: ssstateen
> >            description: |
> >              The standard Ssstateen extension for supervisor-mode view of the
> > @@ -934,6 +946,13 @@ properties:
> >                  const: smnpm
> >              - contains:
> >                  const: ssnpm
> > +      # Ssplcofi depends on Sspesa
> > +      - if:
> > +          contains:
> > +            const: ssplcofi
> > +        then:
> > +          contains:
> > +            const: sspesa
> >        # Za64rs and Ziccrse depend on Zalrsc or A
> >        - if:
> >            contains:
> > --
> > 2.43.0
> >