Unverified Commit d5797ede authored by Stephan Gerhold's avatar Stephan Gerhold Committed by Mark Brown
Browse files

dt-bindings: sound: lpass-cpu: Document DAI subnodes 



The lpass-cpu driver now allows configuring the MI2S SD lines
by defining subnodes for one of the DAIs.

Document this in the device tree bindings.

Signed-off-by: default avatarStephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200425184657.121991-1-stephan@gerhold.net


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent dbab677f

Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt

+25 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ Required properties: 
- reg			: Must contain an address for each entry in reg-names.

- reg-names		: A list which must include the following entries:

				* "lpass-lpaif"

- #address-cells	: Must be 1

- #size-cells		: Must be 0
@@ -37,6 +39,20 @@ Optional properties: 


- qcom,adsp		: Phandle for the audio DSP node



By default, the driver uses up to 4 MI2S SD lines, for a total of 8 channels.

The SD lines to use can be configured by adding subnodes for each of the DAIs.



Required properties for each DAI (represented by a subnode):

- reg			: Must be one of the DAI IDs

			  (usually part of dt-bindings header)

- qcom,playback-sd-lines: List of serial data lines to use for playback

			  Each SD line should be represented by a number from 0-3.

- qcom,capture-sd-lines	: List of serial data lines to use for capture

			  Each SD line should be represented by a number from 0-3.



Note that adding a subnode changes the default to "no lines configured",

so both playback and capture lines should be configured when a subnode is added.



Example:



lpass@28100000 {
@@ -51,4 +67,13 @@ lpass@28100000 { 
	reg = <0x28100000 0x10000>;

	reg-names = "lpass-lpaif";

	qcom,adsp = <&adsp>;



	#address-cells = <1>;

	#size-cells = <0>;



	/* Optional to set different MI2S SD lines */

	dai@3 {

		reg = <MI2S_QUATERNARY>;

		qcom,playback-sd-lines = <0 1>;

	};

};