linux-kernel - Re: [PATCH v4] dt-bindings: riscv: deprecate riscv,isa

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Message-ID: <20230701-b348653e432924f090c513db@orel>
Date:   Sat, 1 Jul 2023 13:01:40 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     palmer@...belt.com, Conor Dooley <conor.dooley@...rochip.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alistair Francis <alistair.francis@....com>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...shpatra.org>,
        Jessica Clarke <jrtc27@...c27.com>,
        Rick Chen <rick@...estech.com>, Leo <ycliang@...estech.com>,
        Oleksii <oleksii.kurochko@...il.com>,
        linux-riscv@...ts.infradead.org, qemu-riscv@...gnu.org,
        u-boot@...ts.denx.de, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v4] dt-bindings: riscv: deprecate riscv,isa

On Fri, Jun 30, 2023 at 07:04:04PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
...
> +oneOf:
> +  - required:
> +      - riscv,isa
> +  - required:
> +      - riscv,isa-base
> +

I guess this means a DT must have either isa or isa-base, but not both.
What should QEMU and other platforms which want to provide DTs that work
for older kernels, but also start using the new schema do? I'd guess
they'd like to provide both, where they'd expect isa-base to be used by
newer kernels and isa by the old.

Thanks,
drew