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

[Samuel Holland]

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 at gmail.com>
> Acked-by: Conor Dooley <conor.dooley at microchip.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