linux-kernel - Re: [PATCH v1] dt-bindings: riscv: explicitly mention assumption of Zicsr & Zifencei support

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Message-ID: <168261716012.3209643.3723944369525088026.robh@kernel.org>
Date:   Thu, 27 Apr 2023 12:39:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     conor@...nel.org, devicetree@...r.kernel.org, palmer@...belt.com,
        linux-riscv@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v1] dt-bindings: riscv: explicitly mention assumption of
 Zicsr & Zifencei support


On Thu, 27 Apr 2023 11:43:42 +0100, Conor Dooley wrote:
> The dt-binding was defined before the extraction of csr access and
> fence.i into their own extensions, and thus the presence of the I
> base extension implies Zicsr and Zifencei.
> There's no harm in adding them obviously, but for backwards
> compatibility with DTs that existed prior to that extraction, software
> is unable to differentiate between "i" and "i_zicsr_zifencei" without
> any further information.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> CC: Conor Dooley <conor@...nel.org>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
> CC: Paul Walmsley <paul.walmsley@...ive.com>
> CC: Palmer Dabbelt <palmer@...belt.com>
> CC: linux-riscv@...ts.infradead.org
> CC: devicetree@...r.kernel.org
> CC: linux-kernel@...r.kernel.org
> ---
>  Documentation/devicetree/bindings/riscv/cpus.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 

Acked-by: Rob Herring <robh@...nel.org>