[PATCH 1/2] ASoC: dt-bindings: qcom: Document "aux-devs" property

[Rob Herring]

On Wed, Aug 19, 2020 at 11:15:32AM +0200, Stephan Gerhold wrote:
> In some cases we need to probe additional audio components that do
> not appear as part of the DAI links specified in the device tree.
> Examples for this are auxiliary devices such as analog amplifiers
> or codecs.
> 
> To make them work they need to be added as part of "aux-devs"
> and connected to some other audio component using the audio routes
> configurable using "(qcom,)audio-routing".
> 
> Cc: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
> Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
> ---
>  .../devicetree/bindings/sound/qcom,apq8016-sbc.txt        | 7 +++++++
>  Documentation/devicetree/bindings/sound/qcom,apq8096.txt  | 8 ++++++++
>  Documentation/devicetree/bindings/sound/qcom,sdm845.txt   | 8 ++++++++
>  3 files changed, 23 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/qcom,apq8016-sbc.txt b/Documentation/devicetree/bindings/sound/qcom,apq8016-sbc.txt
> index 84b28dbe9f15..23998262a0a7 100644
> --- a/Documentation/devicetree/bindings/sound/qcom,apq8016-sbc.txt
> +++ b/Documentation/devicetree/bindings/sound/qcom,apq8016-sbc.txt
> @@ -34,6 +34,13 @@ Required properties:
>  			  * DMIC
>  			  * Ext Spk
>  
> +Optional properties:
> +
> +- aux-devs		: A list of phandles for auxiliary devices (e.g. analog
> +			  amplifiers) that do not appear directly within the DAI
> +			  links. Should be connected to another audio component
> +			  using "qcom,audio-routing".
> +
>  Dai-link subnode properties and subnodes:
>  
>  Required dai-link subnodes:
> diff --git a/Documentation/devicetree/bindings/sound/qcom,apq8096.txt b/Documentation/devicetree/bindings/sound/qcom,apq8096.txt
> index c814e867850f..248df5056fec 100644
> --- a/Documentation/devicetree/bindings/sound/qcom,apq8096.txt
> +++ b/Documentation/devicetree/bindings/sound/qcom,apq8096.txt
> @@ -55,6 +55,14 @@ This binding describes the APQ8096 sound card, which uses qdsp for audio.
>  	Value type: <stringlist>
>  	Definition: The user-visible name of this sound card.
>  
> +- aux-devs
> +	Usage: optional
> +	Value type: <phandles with arguments>

How do you know how many arguments? It either has to be fixed or needs a 
#.*cells in the phandles. For the latter, you'd need to come up with a 
common binding.

> +	Definition: A list of phandles for auxiliary devices (e.g. analog
> +		    amplifiers) that do not appear directly within the DAI
> +		    links. Should be connected to another audio component
> +		    using "audio-routing".
> +
>  = dailinks
>  Each subnode of sndcard represents either a dailink, and subnodes of each
>  dailinks would be cpu/codec/platform dais.
> diff --git a/Documentation/devicetree/bindings/sound/qcom,sdm845.txt b/Documentation/devicetree/bindings/sound/qcom,sdm845.txt
> index ca8c89e88bfa..3d5cbe953cf7 100644
> --- a/Documentation/devicetree/bindings/sound/qcom,sdm845.txt
> +++ b/Documentation/devicetree/bindings/sound/qcom,sdm845.txt
> @@ -24,6 +24,14 @@ This binding describes the SDM845 sound card, which uses qdsp for audio.
>  	Value type: <stringlist>
>  	Definition: The user-visible name of this sound card.
>  
> +- aux-devs
> +	Usage: optional
> +	Value type: <phandles with arguments>
> +	Definition: A list of phandles for auxiliary devices (e.g. analog
> +		    amplifiers) that do not appear directly within the DAI
> +		    links. Should be connected to another audio component
> +		    using "audio-routing".
> +
>  = dailinks
>  Each subnode of sndcard represents either a dailink, and subnodes of each
>  dailinks would be cpu/codec/platform dais.
> -- 
> 2.28.0
>