linux-kernel - Re: [PATCH 1/4] dt-bindings: gpu: mali-bifrost: Allow up to two clocks

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Date:   Wed, 1 Dec 2021 17:31:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alex Bee <knaerzche@...il.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: gpu: mali-bifrost: Allow up to two
 clocks

On Fri, Nov 26, 2021 at 04:17:26PM +0100, Alex Bee wrote:
> Commit b681af0bc1cc ("drm: panfrost: add optional bus_clock")
> added an optional bus_clock to support Allwinner H6 T-720 GPU.

That's midgard and this is bifrost... Driver changes are somewhat 
irrelevant.

> Increase the max clock items in the dt-binding to reflect this.
> 
> Bifrost GPU in Rockchip RK3568 SoCs also has a core and a bus clock
> and it gets added here in a (very) similar way it was done for
> allwinner,sun50i-h6-mali compatible in arm,mali-midgard binding.

I guess that one is insufficient.

> 
> Signed-off-by: Alex Bee <knaerzche@...il.com>
> ---
>  .../bindings/gpu/arm,mali-bifrost.yaml        | 20 ++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> index 6f98dd55fb4c..2849a7a97d73 100644
> --- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> @@ -39,7 +39,14 @@ properties:
>        - const: gpu
>  
>    clocks:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: core
> +      - const: bus
>  
>    mali-supply: true
>  
> @@ -118,6 +125,17 @@ allOf:
>          power-domains:
>            maxItems: 1
>          sram-supply: false
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: rockchip,rk3568-mali
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2

           clock-names:
             minItems: 2

> +      required:
> +        - clock-names

       else:
         properties:
           clocks: 
             maxItems: 1

           clock-names: 
             maxItems: 1

>  
>  examples:
>    - |
> -- 
> 2.30.2
> 
>