| Arnaud Pouliquen | a716157 | 2018-01-10 11:13:14 +0100 | [diff] [blame] | 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 | }; |