linux-kernel - Re: [PATCH v3 1/3] dt-bindings: riscv: add bfloat16 ISA extension description

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Message-ID: <5e878b5b-b49d-4757-8f7e-4b323a4998b3@sifive.com>
Date: Mon, 16 Dec 2024 16:00:00 -0600
From: Samuel Holland <samuel.holland@...ive.com>
To: Inochi Amaoto <inochiama@...il.com>
Cc: linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 Yixun Lan <dlan@...too.org>, Longbin Li <looong.bin@...il.com>,
 Conor Dooley <conor.dooley@...rochip.com>,
 Chen Wang <unicorn_wang@...look.com>, Jonathan Corbet <corbet@....net>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Clément Léger
 <cleger@...osinc.com>, Evan Green <evan@...osinc.com>,
 Charlie Jenkins <charlie@...osinc.com>,
 Andrew Jones <ajones@...tanamicro.com>, Jesse Taube <jesse@...osinc.com>,
 Andy Chiu <andybnac@...il.com>, Alexandre Ghiti <alexghiti@...osinc.com>,
 Yong-Xuan Wang <yongxuan.wang@...ive.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: riscv: add bfloat16 ISA extension
 description

On 2024-12-05 11:58 PM, Inochi Amaoto wrote:
> Add description for the BFloat16 precision Floating-Point ISA extension,
> (Zfbfmin, Zvfbfmin, Zvfbfwma). which was ratified in commit 4dc23d62
> ("Added Chapter title to BF16") of the riscv-isa-manual.
> 
> Signed-off-by: Inochi Amaoto <inochiama@...il.com>
> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../devicetree/bindings/riscv/extensions.yaml | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> index 9c7dd7e75e0c..0a1f1a76d129 100644
> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> @@ -329,6 +329,12 @@ properties:
>              instructions, as ratified in commit 056b6ff ("Zfa is ratified") of
>              riscv-isa-manual.
>  
> +        - const: zfbfmin
> +          description:
> +            The standard Zfbfmin extension which provides minimal support for
> +            16-bit half-precision brain floating-point instructions, as ratified

I think you mean "binary" here and in the entries below, not "brain".

> +            in commit 4dc23d62 ("Added Chapter title to BF16") of riscv-isa-manual.
> +
>          - const: zfh
>            description:
>              The standard Zfh extension for 16-bit half-precision binary
> @@ -525,6 +531,18 @@ properties:
>              in commit 6f702a2 ("Vector extensions are now ratified") of
>              riscv-v-spec.
>  
> +        - const: zvfbfmin
> +          description:
> +            The standard Zvfbfmin extension for minimal support for vectored
> +            16-bit half-precision brain floating-point instructions, as ratified
> +            in commit 4dc23d62 ("Added Chapter title to BF16") of riscv-isa-manual.
> +
> +        - const: zvfbfwma
> +          description:
> +            The standard Zvfbfwma extension for vectored half-precision brain
> +            floating-point widening multiply-accumulate instructions, as ratified
> +            in commit 4dc23d62 ("Added Chapter title to BF16") of riscv-isa-manual.
> +
>          - const: zvfh
>            description:
>              The standard Zvfh extension for vectored half-precision
> @@ -663,6 +681,33 @@ properties:
>          then:
>            contains:
>              const: zca
> +      # Zfbfmin depends on F
> +      - if:
> +          contains:
> +            const: zfbfmin
> +        then:
> +          contains:
> +            const: f
> +      # Zvfbfmin depends on V or Zve32f
> +      - if:
> +          contains:
> +            const: zvfbfmin
> +        then:
> +          oneOf:
> +            - contains:
> +                const: v
> +            - contains:
> +                const: zve32f
> +      # Zvfbfwma depends on Zfbfmin and Zvfbfmin
> +      - if:
> +          contains:
> +            const: zvfbfwma
> +        then:
> +          allOf:
> +            - contains:
> +                const: zfbfmin
> +            - contains:
> +                const: zvfbfmin
>  
>  allOf:
>    # Zcf extension does not exist on rv64