linux-kernel - Re: [PATCH v2 3/4] ASoC: dt-bindings: fsl-sai: allow only one dma-names

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Message-ID: <20240229-husband-penalty-8c1ab0f57f55@spud>
Date: Thu, 29 Feb 2024 18:55:58 +0000
From: Conor Dooley <conor@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Shengjiu Wang <shengjiu.wang@....com>, linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] ASoC: dt-bindings: fsl-sai: allow only one
 dma-names

On Tue, Feb 27, 2024 at 03:54:11PM -0500, Frank Li wrote:
> Some sai only connect one direction. So allow only "rx" or "tx" for
> dma-names.

Which sai? Can you restrict this per compatible please, so that someone
cannot add 2 dmas for ones where only the tx is supported.

|  dmas:
|    minItems: 1
|    items:
|      - description: DMA controller phandle and request line for RX
|      - description: DMA controller phandle and request line for TX

The binding already allows only one, but it documents that the first dma
is always the RX dma, and that doesn't change with this patch..

Cheers,
Conor.

> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  Documentation/devicetree/bindings/sound/fsl,sai.yaml | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,sai.yaml b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> index 2456d958adeef..0302752d58a2b 100644
> --- a/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> +++ b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> @@ -86,10 +86,14 @@ properties:
>        - description: DMA controller phandle and request line for TX
>  
>    dma-names:
> -    minItems: 1
> -    items:
> -      - const: rx
> -      - const: tx
> +    oneOf:
> +      - items:
> +          - const: rx
> +          - const: tx
> +      - items:
> +          - enum:
> +              - rx
> +              - tx
>  
>    interrupts:
>      items:
> 
> -- 
> 2.34.1
> 

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