linux-kernel - Re: [PATCHv3 RESEND 10/10] ASoC: dt-bindings: fsl-asoc-card: add compatible for generic codec

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Date: Wed, 20 Dec 2023 16:25:50 -0600
From: Rob Herring <robh@...nel.org>
To: Elinor Montmasson <elinor.montmasson@...oirfairelinux.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, Shengjiu Wang <shengjiu.wang@...il.com>, Xiubo Li <Xiubo.Lee@...il.com>, Fabio Estevam <festevam@...il.com>, Nicolin Chen <nicoleotsuka@...il.com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, linux-sound@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org, Philip-Dylan <philip-dylan.gleonec@...oirfairelinux.com>
Subject: Re: [PATCHv3 RESEND 10/10] ASoC: dt-bindings: fsl-asoc-card: add
 compatible for generic codec

On Mon, Dec 18, 2023 at 01:40:58PM +0100, Elinor Montmasson wrote:
> Add documentation about new dts bindings following new support
> for compatible "fsl,imx-audio-generic".
> 
> Some CPU DAI don't require a real audio codec. The new compatible
> "fsl,imx-audio-generic" allows using the driver with codec drivers
> SPDIF DIT and SPDIF DIR as dummy codecs.
> It also allows using not pre-configured audio codecs which
> don't require specific control through a codec driver.
> 
> The new dts properties give the possibility to set some parameters
> about the CPU DAI usually set through the codec configuration.
> 
> Signed-off-by: Elinor Montmasson <elinor.montmasson@...oirfairelinux.com>
> Co-authored-by: Philip-Dylan Gleonec <philip-dylan.gleonec@...oirfairelinux.com>
> ---
>  .../bindings/sound/fsl-asoc-card.txt          | 28 ++++++++++++++++++-
>  1 file changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> index 4e8dbc5abfd1..f137ef2154e3 100644
> --- a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> +++ b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt
> @@ -17,6 +17,9 @@ Note: The card is initially designed for those sound cards who use AC'97, I2S
>        and PCM DAI formats. However, it'll be also possible to support those non
>        AC'97/I2S/PCM type sound cards, such as S/PDIF audio and HDMI audio, as
>        long as the driver has been properly upgraded.
> +      To use CPU DAIs that do not require a codec such as an S/PDIF controller,
> +      or to use a DAI to output or capture raw I2S/TDM data, you can
> +      use the compatible "fsl,imx-audio-generic".
>  
>  
>  The compatible list for this generic sound card currently:
> @@ -48,6 +51,8 @@ The compatible list for this generic sound card currently:
>  
>   "fsl,imx-audio-nau8822"
>  
> + "fsl,imx-audio-generic"
> +
>  Required properties:
>  
>    - compatible		: Contains one of entries in the compatible list.
> @@ -56,7 +61,11 @@ Required properties:
>  
>    - audio-cpu		: The phandle of an CPU DAI controller
>  
> -  - audio-codec		: The phandle of an audio codec
> +  - audio-codec		: The phandle of an audio codec.
> +			  If using the "fsl,imx-audio-generic" compatible,
> +			  give instead a pair of phandles with the
> +			  spdif_transmitter first (driver SPDIF DIT) and the
> +			  spdif_receiver second (driver SPDIF DIR).
>  
>  Optional properties:
>  
> @@ -87,6 +96,23 @@ Optional properties:
>    - frame-inversion	: dai-link uses frame clock inversion, for details see simple-card.yaml.
>    - bitclock-inversion	: dai-link uses bit clock inversion, for details see simple-card.yaml.
>    - mclk-id		: main clock id, specific for each card configuration.
> +			  For multi-codec configurations, an array of ids can be
> +			  given, one for each codec.
> +
> +Optional, relevant only with the "fsl,imx-audio-generic" compatible:
> +
> +  - cpu-slot-width	: Indicates a specific TDM slot width in bits.
> +  - cpu-slot-num	: Indicates a specific number of TDM slots per frame.

Pretty sure I've seen other bindings with TDM slot properties. A sign we 
need something common if we don't already have something.

> +
> +  - cpu-sysclk-freq-rx	: Frequency of the CPU DAI sys clock for Rx.
> +  - cpu-sysclk-freq-tx	: Frequency of the CPU DAI sys clock for Tx.
> +
> +  - cpu-sysclk-dir-rx-out	: Boolean property. Specifies sys clock direction
> +				  as 'out' on initialization for Rx.
> +				  If not set, default direction is 'in'.
> +  - cpu-sysclk-dir-tx-out	: Boolean property. Specifies sys clock direction
> +				  as 'out' on initialization for Tx.
> +				  If not set, default direction is 'in'.

Looks like clock stuff. Use the clock binding.

Rob