| 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>; |
| }; |
| }; |
| }; |
