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- STMicroelectronics Audio Digital Filter Sigma Delta modulators(DFSDM)
- The DFSDM allows PDM microphones capture through SPI interface. The Audio
- interface is seems as a sub block of the DFSDM device.
- For details on DFSDM bindings refer to ../iio/adc/st,stm32-dfsdm-adc.txt
- Required properties:
- - compatible: "st,stm32h7-dfsdm-dai".
- - #sound-dai-cells : Must be equal to 0
- - io-channels : phandle to iio dfsdm instance node.
- Example of a sound card using audio DFSDM node.
- sound_card {
- compatible = "audio-graph-card";
- dais = <&cpu_port>;
- };
- dfsdm: dfsdm@40017000 {
- compatible = "st,stm32h7-dfsdm";
- reg = <0x40017000 0x400>;
- clocks = <&rcc DFSDM1_CK>;
- clock-names = "dfsdm";
- #interrupt-cells = <1>;
- #address-cells = <1>;
- #size-cells = <0>;
- dfsdm_adc0: filter@0 {
- compatible = "st,stm32-dfsdm-dmic";
- reg = <0>;
- interrupts = <110>;
- dmas = <&dmamux1 101 0x400 0x00>;
- dma-names = "rx";
- st,adc-channels = <1>;
- st,adc-channel-names = "dmic0";
- st,adc-channel-types = "SPI_R";
- st,adc-channel-clk-src = "CLKOUT";
- st,filter-order = <5>;
- dfsdm_dai0: dfsdm-dai {
- compatible = "st,stm32h7-dfsdm-dai";
- #sound-dai-cells = <0>;
- io-channels = <&dfsdm_adc0 0>;
- cpu_port: port {
- dfsdm_endpoint: endpoint {
- remote-endpoint = <&dmic0_endpoint>;
- };
- };
- };
- };
- dmic0: dmic@0 {
- compatible = "dmic-codec";
- #sound-dai-cells = <0>;
- port {
- dmic0_endpoint: endpoint {
- remote-endpoint = <&dfsdm_endpoint>;
- };
- };
- };
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