1*4882a593SmuzhiyunSTMicroelectronics Audio Digital Filter Sigma Delta modulators(DFSDM) 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunThe DFSDM allows PDM microphones capture through SPI interface. The Audio 4*4882a593Smuzhiyuninterface is seems as a sub block of the DFSDM device. 5*4882a593SmuzhiyunFor details on DFSDM bindings refer to ../iio/adc/st,stm32-dfsdm-adc.txt 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunRequired properties: 8*4882a593Smuzhiyun - compatible: "st,stm32h7-dfsdm-dai". 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun - #sound-dai-cells : Must be equal to 0 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun - io-channels : phandle to iio dfsdm instance node. 13*4882a593Smuzhiyun 14*4882a593SmuzhiyunExample of a sound card using audio DFSDM node. 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun sound_card { 17*4882a593Smuzhiyun compatible = "audio-graph-card"; 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun dais = <&cpu_port>; 20*4882a593Smuzhiyun }; 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun dfsdm: dfsdm@40017000 { 23*4882a593Smuzhiyun compatible = "st,stm32h7-dfsdm"; 24*4882a593Smuzhiyun reg = <0x40017000 0x400>; 25*4882a593Smuzhiyun clocks = <&rcc DFSDM1_CK>; 26*4882a593Smuzhiyun clock-names = "dfsdm"; 27*4882a593Smuzhiyun #interrupt-cells = <1>; 28*4882a593Smuzhiyun #address-cells = <1>; 29*4882a593Smuzhiyun #size-cells = <0>; 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun dfsdm_adc0: filter@0 { 32*4882a593Smuzhiyun compatible = "st,stm32-dfsdm-dmic"; 33*4882a593Smuzhiyun reg = <0>; 34*4882a593Smuzhiyun interrupts = <110>; 35*4882a593Smuzhiyun dmas = <&dmamux1 101 0x400 0x00>; 36*4882a593Smuzhiyun dma-names = "rx"; 37*4882a593Smuzhiyun st,adc-channels = <1>; 38*4882a593Smuzhiyun st,adc-channel-names = "dmic0"; 39*4882a593Smuzhiyun st,adc-channel-types = "SPI_R"; 40*4882a593Smuzhiyun st,adc-channel-clk-src = "CLKOUT"; 41*4882a593Smuzhiyun st,filter-order = <5>; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun dfsdm_dai0: dfsdm-dai { 44*4882a593Smuzhiyun compatible = "st,stm32h7-dfsdm-dai"; 45*4882a593Smuzhiyun #sound-dai-cells = <0>; 46*4882a593Smuzhiyun io-channels = <&dfsdm_adc0 0>; 47*4882a593Smuzhiyun cpu_port: port { 48*4882a593Smuzhiyun dfsdm_endpoint: endpoint { 49*4882a593Smuzhiyun remote-endpoint = <&dmic0_endpoint>; 50*4882a593Smuzhiyun }; 51*4882a593Smuzhiyun }; 52*4882a593Smuzhiyun }; 53*4882a593Smuzhiyun }; 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun dmic0: dmic@0 { 56*4882a593Smuzhiyun compatible = "dmic-codec"; 57*4882a593Smuzhiyun #sound-dai-cells = <0>; 58*4882a593Smuzhiyun port { 59*4882a593Smuzhiyun dmic0_endpoint: endpoint { 60*4882a593Smuzhiyun remote-endpoint = <&dfsdm_endpoint>; 61*4882a593Smuzhiyun }; 62*4882a593Smuzhiyun }; 63*4882a593Smuzhiyun }; 64