st,stm32-adfsdm.txt

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    1 STMicroelectronics Audio Digital Filter Sigma Delta modulators(DFSDM)
    2 
    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
    6 
    7 Required properties:
    8   - compatible: "st,stm32h7-dfsdm-dai".
    9 
   10   - #sound-dai-cells : Must be equal to 0
   11 
   12   - io-channels : phandle to iio dfsdm instance node.
   13 
   14 Example of a sound card using audio DFSDM node.
   15 
   16         sound_card {
   17                 compatible = "audio-graph-card";
   18 
   19                 dais = <&cpu_port>;
   20         };
   21 
   22         dfsdm: dfsdm@40017000 {
   23                 compatible = "st,stm32h7-dfsdm";
   24                 reg = <0x40017000 0x400>;
   25                 clocks = <&rcc DFSDM1_CK>;
   26                 clock-names = "dfsdm";
   27                 #interrupt-cells = <1>;
   28                 #address-cells = <1>;
   29                 #size-cells = <0>;
   30 
   31                 dfsdm_adc0: filter@0 {
   32                         compatible = "st,stm32-dfsdm-dmic";
   33                         reg = <0>;
   34                         interrupts = <110>;
   35                         dmas = <&dmamux1 101 0x400 0x00>;
   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>;
   42 
   43                         dfsdm_dai0: dfsdm-dai {
   44                                 compatible = "st,stm32h7-dfsdm-dai";
   45                                 #sound-dai-cells = <0>;
   46                                 io-channels = <&dfsdm_adc0 0>;
   47                                 cpu_port: port {
   48                                 dfsdm_endpoint: endpoint {
   49                                         remote-endpoint = <&dmic0_endpoint>;
   50                                 };
   51                         };
   52                 };
   53         };
   54 
   55         dmic0: dmic@0 {
   56                 compatible = "dmic-codec";
   57                 #sound-dai-cells = <0>;
   58                 port {
   59                         dmic0_endpoint: endpoint {
   60                                 remote-endpoint = <&dfsdm_endpoint>;
   61                         };
   62                 };
   63         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/sound/st,stm32-adfsdm.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/sound/st,stm32-adfsdm.txt