linux-kernel - [RFC] dt-bindings: riscv: enum for riscv,isa

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Message-ID: <5385012d-9f09-d7d9-7b6a-cef7de2d4056@gmx.de>
Date:   Tue, 6 Apr 2021 21:05:34 +0200
From:   Heinrich Schuchardt <xypron.glpk@....de>
To:     Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: [RFC] dt-bindings: riscv: enum for riscv,isa

In Documentation/devicetree/bindings/riscv/cpus.yaml I find for riscv,isa:

     enum:
       - rv64imac
       - rv64imafdc

This implies that 'rv64imafc' or 'rv64imafdqc' would be illegal values
while these combinations of extensions would be compliant with "The
RISC-V Instruction Set Manual".

To me it does not make much sense to try to enumerate all permissible
permutations of RISC-V extensions.

Shouldn't this enum be removed and replaced by examples?

Best regards

Heinrich