linux-kernel - Re: [PATCH] dt-bindings: riscv: fix SiFive l2-cache's cache-sets

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Date:   Thu, 4 Aug 2022 12:26:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <mail@...chuod.ie>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Atul Khare <atulkhare@...osinc.com>,
        Sagar Kadam <sagar.kadam@...ive.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: riscv: fix SiFive l2-cache's cache-sets

On 03/08/2022 20:54, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> Fix device tree schema validation error messages for the SiFive
> Unmatched: ' cache-sets:0:0: 1024 was expected'.
> 
> The existing bindings allow for just 1024 cache-sets but the fu740 on
> Unmatched the has 2048 cache-sets. The ISA itself permits any arbitrary
> power of two, however this is not supported by dt-schema. The RTL for
> the IP, to which the number of cache-sets is a tunable parameter, has
> been released publicly so speculatively adding a small number of
> "reasonable" values seems unwise also.
> 
> Instead, as the binding only supports two distinct controllers: add 2048
> and explicitly lock it to the fu740's l2 cache while limiting 1024 to
> the l2 cache on the fu540.
> 
> Fixes: af951c3a113b ("dt-bindings: riscv: Update l2 cache DT documentation to add support for SiFive FU740")
> Reported-by: Atul Khare <atulkhare@...osinc.com>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> I split this off from the existing series as there is no dependancy
> between this cache change and the gpio patch. The prior series can
> be found at:
> https://lore.kernel.org/all/20220726170725.3245278-2-mail@conchuod.ie/
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


Best regards,
Krzysztof