linux-kernel - Re: [PATCH v1 2/2] dt-bindings: riscv: Add DT binding for RISC-V ISA extensions

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Date:   Fri, 24 Dec 2021 23:25:01 +0000
From:   Jessica Clarke <jrtc27@...c27.com>
To:     Atish Patra <atishp@...shpatra.org>
Cc:     linux-kernel@...r.kernel.org, Atish Patra <atishp@...osinc.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Damien Le Moal <damien.lemoal@....com>,
        devicetree@...r.kernel.org, Jisheng Zhang <jszhang@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v1 2/2] dt-bindings: riscv: Add DT binding for RISC-V ISA
 extensions

On 24 Dec 2021, at 21:16, Atish Patra <atishp@...shpatra.org> wrote:
> 
> RISC-V ISA extensions can be single letter or multi-letter names.
> The single letter extensions are mostly base extensions and encoded in
> "riscv,isa" DT property. However, parsing the multi-letter extensions
> via the isa string is cumbersome and is not scalable.
> 
> Add a new DT node for multi-letter extensions.
> 
> Signed-off-by: Atish Patra <atishp@...osinc.com>
> ---
> Documentation/devicetree/bindings/riscv/cpus.yaml | 9 +++++++++
> 1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
> index aa5fb64d57eb..6c4eecf389a9 100644
> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
> @@ -78,6 +78,15 @@ properties:
>       - rv64imac
>       - rv64imafdc
> 
> +  riscv,isa-ext:
> +    description:
> +      Identifies the specific RISC-V instruction set architecture extensions
> +      supported by one or multiple harts. All the multi-letter extensions
> +      should be listed here as a boolean property. This subnode can be under
> +      /cpus or under individual cpu node. In case of former, it represent
> +      the common ISA extensions for all harts. The name of the boolean property
> +      must match the actual ISA extension name in all lowercase format.

I don’t see why this needs explicitly calling out, that’s true in
general of cpu node properties (3.8p4 of the Devicetree spec v0.4-rc1 /
v0.3-40-g7e1cc17), not that I like it.

Jess