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

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Message-ID: <tencent_85F69423082E524C478844E31D5F8920A506@qq.com>
Date:   Fri, 28 Apr 2023 22:16:01 +0800
From:   Yangyu Chen <cyy@...self.name>
To:     Conor Dooley <conor@...nel.org>,
        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>
Cc:     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: [PATCH v2 2/2] dt-bindings: riscv: drop invalid comment about riscv,isa lower-case reasoning

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>
---
 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