linux-kernel - Re: [PATCH v4 2/2] ASoC: dt-bindings: audio-graph-port: Document new DAI link flags playback-only/capture-only

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Message-ID: <20231129145400.GA2447249-robh@kernel.org>
Date:   Wed, 29 Nov 2023 08:54:00 -0600
From:   Rob Herring <robh@...nel.org>
To:     Daniel Baluta <daniel.baluta@....nxp.com>
Cc:     broonie@...nel.org, kuninori.morimoto.gx@...esas.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        lgirdwood@...il.com, daniel.baluta@...il.com,
        alsa-devel@...a-project.org, iuliana.prodan@....com,
        shengjiu.wang@....com
Subject: Re: [PATCH v4 2/2] ASoC: dt-bindings: audio-graph-port: Document new
 DAI link flags playback-only/capture-only

On Tue, Nov 28, 2023 at 10:11:19AM +0200, Daniel Baluta wrote:
> From: Daniel Baluta <daniel.baluta@....com>
> 
> Document new playback-only and capture-only flags which can be used
> when dai link can only support just one direction: playback or capture
> but not both.
> 
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
>  .../devicetree/bindings/sound/audio-graph-port.yaml         | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> index 60b5e3fd1115..b13c08de505e 100644
> --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml
> @@ -19,6 +19,12 @@ definitions:
>      properties:
>        mclk-fs:
>          $ref: simple-card.yaml#/definitions/mclk-fs
> +      playback-only:
> +        description: port connection used only for playback
> +        $ref: /schemas/types.yaml#/definitions/flag
> +      capture-only:
> +        description: port connection used only for capture
> +        $ref: /schemas/types.yaml#/definitions/flag

It seems like we have a random mix of port and endpoint properties here 
and I can't tell what's the logic for deciding the right place. 
Everything in port is also in endpoint, so maybe using port is 
deprecated. In most cases for graph bindings, we put properties in 
endpoint nodes.

Rob