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