Add bindings that describes audio settings to support
Digital Filter for pulse density modulation(PDM) microphone.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxx>
---
V2->V3:
Fixes based on V2 comments
.../devicetree/bindings/sound/st,stm32-adfsdm.txt | 41 ++++++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt b/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
new file mode 100644
index 0000000..ab610bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
@@ -0,0 +1,40 @@
+STMicroelectronics audio DFSDM DT bindings
+
+This driver supports audio PDM microphone capture through Digital Filter format
+Sigma Delta modulators (DFSDM).
+
+Required properties:
+ - compatible: "st,stm32h7-adfsdm".
+
+ - #sound-dai-cells : Must be equal to 0
+
+ - io-channels : phandle to iio dfsdm instance node.
+
+
+Example of a simple sound card using audio DFSDM node.
+
+ dmic0: dmic_@0 {
+ compatible = "dmic-codec";
+ #sound-dai-cells = <0>;
+ };
+
+ asoc-pdm@0 {
+ compatible = "st,stm32h7-adfsdm";
+ #sound-dai-cells = <0>;
+ io-channels = <&dfsdm_adc0 0>;
+ };
+
+ sound_dfsdm_pdm {
+ compatible = "simple-audio-card";
+ simple-audio-card,name = "dfsdm_pdm";
+
+ dfsdm0_mic0: simple-audio-card,dai-link@0 {
+ format = "pdm";
+ cpu {
+ sound-dai = <&asoc_pdm1>;
+ };
+ dmic0_codec: codec {
+ sound-dai = <&dmic0>;
+ };
+ };
+ };
\ No newline at end of file
--
1.9.1
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