bindings/sound/st%2Cstm32-adfsdm.txt

1 STMicroelectronics Audio Digital Filter Sigma Delta modulators(DFSDM)
3 The DFSDM allows PDM microphones capture through SPI interface. The Audio
4 interface is seems as a sub block of the DFSDM device.
5 For details on DFSDM bindings refer to ../iio/adc/st,stm32-dfsdm-adc.txt
8   - compatible: "st,stm32h7-dfsdm-dai".
10   - #sound-dai-cells : Must be equal to 0
12   - io-channels : phandle to iio dfsdm instance node.
14 Example of a sound card using audio DFSDM node.
17 		compatible = "audio-graph-card";
22 	dfsdm: dfsdm@40017000 {
23 		compatible = "st,stm32h7-dfsdm";
26 		clock-names = "dfsdm";
27 		#interrupt-cells = <1>;
28 		#address-cells = <1>;
29 		#size-cells = <0>;
32 			compatible = "st,stm32-dfsdm-dmic";
36 			dma-names = "rx";
37 			st,adc-channels = <1>;
38 			st,adc-channel-names = "dmic0";
39 			st,adc-channel-types = "SPI_R";
40 			st,adc-channel-clk-src = "CLKOUT";
41 			st,filter-order = <5>;
43 			dfsdm_dai0: dfsdm-dai {
44 				compatible = "st,stm32h7-dfsdm-dai";
45 				#sound-dai-cells = <0>;
46 				io-channels = <&dfsdm_adc0 0>;
49 					remote-endpoint = <&dmic0_endpoint>;
56 		compatible = "dmic-codec";
57 		#sound-dai-cells = <0>;
60 				remote-endpoint = <&dfsdm_endpoint>;