linux-kernel - Re: [PATCH 4/7] dt-bindings: dma: allwinner,sun50i-a64-dma: Add compatible for H616

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Date: Mon, 22 Jan 2024 18:18:12 +0000
From: Conor Dooley <conor@...nel.org>
To: Chen-Yu Tsai <wens@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Vinod Koul <vkoul@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-sound@...r.kernel.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] dt-bindings: dma: allwinner,sun50i-a64-dma: Add
 compatible for H616

On Tue, Jan 23, 2024 at 01:05:15AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
> 
> The DMA controllers found on the H616 and H618 are the same as the one
> found on the H6. The only difference is the DMA endpoint (DRQ) layout.
> 
> Since the number of channels and endpoints are described with additional
> generic properties, just add a new H616-specific compatible string and
> fallback to the H6 one.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  .../bindings/dma/allwinner,sun50i-a64-dma.yaml    | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/allwinner,sun50i-a64-dma.yaml b/Documentation/devicetree/bindings/dma/allwinner,sun50i-a64-dma.yaml
> index ec2d7a789ffe..e5693be378bd 100644
> --- a/Documentation/devicetree/bindings/dma/allwinner,sun50i-a64-dma.yaml
> +++ b/Documentation/devicetree/bindings/dma/allwinner,sun50i-a64-dma.yaml
> @@ -28,6 +28,9 @@ properties:
>        - items:
>            - const: allwinner,sun8i-r40-dma
>            - const: allwinner,sun50i-a64-dma
> +      - items:
> +          - const: allwinner,sun50i-h616-dma
> +          - const: allwinner,sun50i-h6-dma
>  
>    reg:
>      maxItems: 1
> @@ -59,10 +62,14 @@ required:
>  if:
>    properties:
>      compatible:
> -      enum:
> -        - allwinner,sun20i-d1-dma
> -        - allwinner,sun50i-a100-dma
> -        - allwinner,sun50i-h6-dma
> +      oneOf:
> +        - enum:
> +            - allwinner,sun20i-d1-dma
> +            - allwinner,sun50i-a100-dma
> +            - allwinner,sun50i-h6-dma
> +        - items:
> +            - const: allwinner,sun50i-h616-dma
> +            - const: allwinner,sun50i-h6-dma

Instead of introducing this complexity, could you instead use "contains"
here? Unless I am missing soemthing, you can achieve the same thing here
with:
|if:
|  properties:
|    compatible:
|      constains:
|        enum:
|          - allwinner,sun20i-d1-dma
|          - allwinner,sun50i-a100-dma
|          - allwinner,sun50i-h6-dma

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