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Unverified Commit a7161579 authored by Arnaud Pouliquen's avatar Arnaud Pouliquen Committed by Mark Brown
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ASoC: add bindings for stm32 DFSDM filter 



Add bindings that describes audio settings to support
Digital Filter for pulse density modulation(PDM) microphone.

Signed-off-by: default avatarArnaud Pouliquen <arnaud.pouliquen@st.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 4fbd8d19

Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt

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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>;

			};

		};

	};