On Fri, Mar 17, 2017 at 03:08:23PM +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@st.com
V2->V3: Fixes based on V2 comments
.../devicetree/bindings/sound/st,stm32-adfsdm.txt | 41 ++++++++++++++++++++++ 1 file changed, 41 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..ab610bc --- /dev/null +++ b/Documentation/devicetree/bindings/sound/st,stm32-adfsdm.txt @@ -0,0 +1,40 @@ +STMicroelectronics audio DFSDM DT bindings
+This driver supports audio PDM microphone capture through Digital Filter format +Sigma Delta modulators (DFSDM).
+Required properties:
- compatible: "st,stm32h7-adfsdm".
- #sound-dai-cells : Must be equal to 0
- io-channels : phandle to iio dfsdm instance node.
+Example of a simple sound card using audio DFSDM node.
- dmic0: dmic_@0 {
Drop the '_' and unit address.
compatible = "dmic-codec";#sound-dai-cells = <0>;- };
- asoc-pdm@0 {
asoc is a Linux term. Drop the unit address.
compatible = "st,stm32h7-adfsdm";
Is this a separate block from the ADC? A drawing of the h/w blocks and connections would help.
#sound-dai-cells = <0>;io-channels = <&dfsdm_adc0 0>;- };
- sound_dfsdm_pdm {
sound-card {
compatible = "simple-audio-card";simple-audio-card,name = "dfsdm_pdm";dfsdm0_mic0: simple-audio-card,dai-link@0 {
I'd suggest moving to the graph card.
format = "pdm";cpu {sound-dai = <&asoc_pdm1>;
This phandle doesn't point to anything.
};dmic0_codec: codec {sound-dai = <&dmic0>;};};- };
\ No newline at end of file
^^^
-- 1.9.1