linux-kernel - Re: [PATCH v2] dt-bindings: dma: xilinx: Add power-domains to xlnx,zynqmp-dpdma

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Date:   Wed, 3 May 2023 15:51:25 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Michal Simek <michal.simek@....com>
Cc:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, devicetree@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] dt-bindings: dma: xilinx: Add power-domains to
 xlnx,zynqmp-dpdma

Hi Michal,

Thank you for the patch.

On Wed, May 03, 2023 at 10:00:20AM +0200, Michal Simek wrote:
> DP DMA has own power domain that's why describe optional power-domain
> property.

As far as I understand, the property should always be specified, the
only reason why it's not mandatory is backward-compatibility (I would
make it mandatory, as I think proper validation of new DT is more
important than avoiding breaking validation - but not operation! - of
old DT, but that's a separate story). If my understanding is correct,
could you please update the example in the bindings to add the
power-domains property ?

> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
> Changes in v2:
> - rewrite commit message - requested by Krzysztof
> 
> The commit b06112cd5e08 ("arm64: dts: zynqmp: Add power domain for the
> DisplayPort DMA controller") added this property already in Linux that's
> why the patch is also fixing dts_check warnings.
> 
> ---
>  .../devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml      | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml b/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
> index 825294e3f0e8..f066f6983899 100644
> --- a/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
> +++ b/Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dpdma.yaml
> @@ -41,6 +41,9 @@ properties:
>    clock-names:
>      const: axi_clk
>  
> +  power-domains:
> +    maxItems: 1
> +
>  required:
>    - "#dma-cells"
>    - compatible

-- 
Regards,

Laurent Pinchart