Add bindings that describes audio settings to support Digital Filter for pulse density modulation(PDM) microphone.
Signed-off-by: Arnaud Pouliquen arnaud.pouliquen@st.com --- 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