On Thu, Nov 09, 2017 at 11:12:33AM +0100, Arnaud Pouliquen wrote:
> Add bindings that describes audio settings to support
> Digital Filter for pulse density modulation(PDM) microphone.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxx>
> ---
> V3 -> V4 changes:
> - Update to move on of_graph description.
> - Link to DFSDM IIO bindings.
>
> .../devicetree/bindings/sound/st,stm32-adfsdm.txt | 63 ++++++++++++++++++++++
> 1 file changed, 63 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
>
> diff --git a/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt b/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
> new file mode 100644
> index 0000000..75e298b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt
> @@ -0,0 +1,63 @@
> +STMicroelectronics audio DFSDM DT bindings
> +
> +This driver supports audio PDM microphone capture through Digital Filter format
Bindings aren't drivers.
> +Sigma Delta modulators (DFSDM).
> +
> +Required properties:
> + - compatible: "st,stm32h7-dfsdm-dai".
> +
> + - #sound-dai-cells : Must be equal to 0
> +
> + - io-channels : phandle to iio dfsdm instance node.
> + [See: ../iio/adc/st,stm32-dfsdm-adc.txt for DFSDM options]
> +
> +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";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + dfsdm_adc0: dfsdm-adc@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@0 {
Unit address without reg property is not valid. Building your dtb with
W=2 will tell you this.
Need a space after the ':'.
Should be a child of dfsdm?
> + compatible = "st,stm32h7-dfsdm-dai";
> + #sound-dai-cells = <0>;
> + io-channels = <&dfsdm_adc0 0>;
It doesn't seem like this is an actual h/w block. Why can't 'dais' point
directly to the ADC?
> + 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>;
> + };
> + };
> + };
> --
> 2.7.4
>
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