linux-kernel - Re: [PATCH 3/4] dt-bindings: cache: sifive,ccache0: Add sifive,cache-ops property

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Date:   Thu, 26 Oct 2023 14:16:40 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH 3/4] dt-bindings: cache: sifive,ccache0: Add
 sifive,cache-ops property

Hey Emil,

On Wed, Oct 25, 2023 at 11:56:41AM -0700, Emil Renner Berthing wrote:
> This cache controller also supports flushing cache lines by writing
> their address to a register. This can be used for cache management on
> SoCs with non-coherent DMAs that predate the RISC-V Zicbom extension
> such as the StarFive JH7100 SoC.

I'm not really sure why we need the flag, is it not sufficient to
register the cache ops on a per-compatible basis? At least for the
jh7110, you're always going to want them, otherwise your system is going
to be largely non-functional, right?

> 
> Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> ---
>  Documentation/devicetree/bindings/cache/sifive,ccache0.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
> b/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
> index 7e8cebe21584..36ae6f48ce0b 100644
> --- a/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
> +++ b/Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
> @@ -81,6 +81,11 @@ properties:
>        The reference to the reserved-memory for the L2 Loosely
> Integrated Memory region.
>        The reserved memory node should be defined as per the bindings
> in reserved-memory.txt.
> 
> +  sifive,cache-ops:
> +    type: boolean
> +    description: |

and this | is not required btw, since there's no formatting here that
would need to be preserved.

Cheers,
Conor.

> +      Use this cache controller for non-standard cache management operations.
> +
>  allOf:
>    - $ref: /schemas/cache-controller.yaml#
> 
> -- 
> 2.40.1

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