linux-kernel - Re: [PATCH v3 6/9] dt-bindings: cache: add QiLai compatible to ax45mp

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Message-ID: <20250513-duplex-collage-5a52f50b74bb@spud>
Date: Tue, 13 May 2025 16:53:09 +0100
From: Conor Dooley <conor@...nel.org>
To: Ben Zong-You Xie <ben717@...estech.com>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
	alex@...ti.fr, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, tglx@...utronix.de, daniel.lezcano@...aro.org,
	prabhakar.mahadev-lad.rj@...renesas.com, devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	tim609@...estech.com
Subject: Re: [PATCH v3 6/9] dt-bindings: cache: add QiLai compatible to ax45mp

On Tue, May 13, 2025 at 05:49:30PM +0800, Ben Zong-You Xie wrote:
> Add a new compatible string for ax45mp-cache on QiLai SoC.
> 
> Also, add allOf constraints to enforce specific cache-sets and cache-size
> values for each compatible string.

"Also" is a massive hint that this should be two patches. I think the
Renesas part (if it can only do 1024/262144, and is not configurable)
should be a patch of its own, since it is valid independent of this
being added.

> 
> Signed-off-by: Ben Zong-You Xie <ben717@...estech.com>
> ---
>  .../cache/andestech,ax45mp-cache.yaml         | 52 +++++++++++++++++--
>  1 file changed, 47 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml b/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> index df8bba14f758..dc03ffae6c9f 100644
> --- a/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> +++ b/Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml
> @@ -28,7 +28,9 @@ select:
>  properties:
>    compatible:
>      items:
> -      - const: renesas,r9a07g043f-ax45mp-cache
> +      - enum:
> +          - andestech,qilai-ax45mp-cache
> +          - renesas,r9a07g043f-ax45mp-cache
>        - const: andestech,ax45mp-cache
>        - const: cache
>  
> @@ -44,11 +46,9 @@ properties:
>    cache-level:
>      const: 2
>  
> -  cache-sets:
> -    enum: [1024, 2048]

^^ this and...

> +  cache-sets: true
>  
> -  cache-size:
> -    enum: [131072, 262144, 524288, 1048576, 2097152]

... ^^ this should remain at the top level...

> +  cache-size: true
>  
>    cache-unified: true
>  
> @@ -66,7 +66,49 @@ required:
>    - cache-size
>    - cache-unified
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: andestech,qilai-ax45mp-cache
> +
> +    then:
> +      properties:
> +        cache-sets:
> +          const: 2048
> +        cache-size:
> +          const: 2097152

...and you just constrain things here. Effectively this means just
restore the enum outside the if/then/else.

> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a07g043f-ax45mp-cache
> +
> +    then:
> +      properties:
> +        cache-sets:
> +          const: 1024
> +        cache-size:
> +          const: 262144
> +
>  examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>

Honestly, just delete this whole example, it doesn't do anything
meaningfully different from the existing one.

> +    l2_cache: cache-controller@...000 {

But if you don't delete the example, remove the "l2_cache" label cos it
is unused.


Cheers,
Conor.

> +        compatible = "andestech,qilai-ax45mp-cache", "andestech,ax45mp-cache",
> +                     "cache";
> +        reg = <0x00200000 0x100000>;
> +        interrupts = <16 IRQ_TYPE_LEVEL_HIGH>;
> +        cache-line-size = <64>;
> +        cache-level = <2>;
> +        cache-sets = <2048>;
> +        cache-size = <2097152>;
> +        cache-unified;
> +    };
> +
>    - |
>      #include <dt-bindings/interrupt-controller/irq.h>
>  
> -- 
> 2.34.1
> 

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