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: Stephan Gerhold <stephan@xxxxxxxxxxx>
---
.../bindings/sound/qcom,lpass-cpu.txt | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
index 21c648328be9..df53a10502f7 100644
--- a/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
+++ b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
@@ -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 +39,18 @@ 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 (0-3) to use for playback
+- qcom,capture-sd-lines : List of serial data lines (0-3) to use for capture
+
+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 +65,13 @@ 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 */
+ mi2s-quaternary@3 {
+ reg = <MI2S_QUATERNARY>;
+ qcom,playback-sd-lines = <0 1>;
+ };
};
--
2.26.0
