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

From: Conor Dooley <conor@kernel.org>
To: Mayuresh Chitale <mayuresh.chitale@oss.qualcomm.com>
Cc: Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Guodong Xu <docular.xu@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Deepak Gupta <debug@rivosinc.com>,
	Xu Lu <luxu.kernel@bytedance.com>,
	Pincheng Wang <pincheng.plct@isrc.iscas.ac.cn>,
	devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 1/3] dt-bindings: riscv: Add Sspesa and Ssplcofi extensions
Date: Tue, 18 Aug 2026 10:35:51 +0100	[thread overview]
Message-ID: <20260818-hunger-module-a44d9716010d@spud> (raw)
In-Reply-To: <20260817160222.3313295-2-mayuresh.chitale@oss.qualcomm.com>

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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@oss.qualcomm.com>

Why is this series RFC?

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
> 

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