linux-kernel - Re: [PATCH v2 2/2] dt-bindings: riscv: drop invalid comment about riscv,isa lower-case reasoning

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Date:   Fri, 28 Apr 2023 18:05:53 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Yangyu Chen <cyy@...self.name>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Jones <ajones@...tanamicro.com>,
        Wende Tan <twd2.me@...il.com>, Soha Jin <soha@...u.info>,
        Hongren Zheng <i@...ithal.me>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 2/2] dt-bindings: riscv: drop invalid comment about
 riscv,isa lower-case reasoning

On Fri, Apr 28, 2023 at 10:16:01PM +0800, Yangyu Chen wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> "Ease of parsing" may have been the initial argument for keeping this
> string in lower-case, but parsers may have been written that expect
> lower-case only.
> For example, the one in released kernels currently does not behave
> correctly for multi-letter extensions that begin with a capital letter.
> Allowing upper-case here brings about no benefit but would break
> compatibility between new devicetrees and older kernels.
> 
> Drop the comment to avoid confusing people.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

You missed an Acked-by from Rob here:
https://lore.kernel.org/all/168261158214.3107331.4410018416833510357.robh@kernel.org/

Also, when you are submitting a patch authored by another person, you
need to append your Signed-off-by to the patch ;)

Cheers,
Conor.


> ---
>  Documentation/devicetree/bindings/riscv/cpus.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
> index 001931d526ec..1ee97621d0c7 100644
> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
> @@ -81,7 +81,7 @@ properties:
>  
>        While the isa strings in ISA specification are case
>        insensitive, letters in the riscv,isa string must be all
> -      lowercase to simplify parsing.
> +      lowercase.
>      $ref: "/schemas/types.yaml#/definitions/string"
>      pattern: ^rv(?:64|32)imaf?d?q?c?b?k?j?p?v?h?(?:[hsxz](?:[a-z])+)?(?:_[hsxz](?:[a-z])+)*$
>  
> -- 
> 2.40.0
> 

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