On Thu, 15 Jun 2023 17:26:20 +0200 Herve Codina herve.codina@bootlin.com wrote:
The additional-devs subnode allows to declared some virtual devices as sound card children. These virtual devices can then be used by the sound card and so be present in the audio path.
The first virtual device supported is the audio IIO auxiliary device in order to support an IIO device as an audio auxiliary device.
Signed-off-by: Herve Codina herve.codina@bootlin.com
Looks fine to me, but given it's not an area I know that much about (other than the iio consumer bits) take that with a pinch of salt.
Reviewed-by: Jonathan Cameron Jonathan.Cameron@huawei.com
.../bindings/sound/simple-card.yaml | 53 +++++++++++++++++++ 1 file changed, 53 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/simple-card.yaml b/Documentation/devicetree/bindings/sound/simple-card.yaml index b05e05c81cc4..59ac2d1d1ccf 100644 --- a/Documentation/devicetree/bindings/sound/simple-card.yaml +++ b/Documentation/devicetree/bindings/sound/simple-card.yaml @@ -148,6 +148,15 @@ definitions: required: - sound-dai
- additional-devs:
- type: object
- description:
Additional devices used by the simple audio card.- patternProperties:
'^iio-aux(-.+)?$':type: object$ref: audio-iio-aux.yaml#properties: compatible: contains: @@ -187,6 +196,8 @@ properties: $ref: "#/definitions/mclk-fs" simple-audio-card,aux-devs: $ref: "#/definitions/aux-devs"
- simple-audio-card,additional-devs:
- $ref: "#/definitions/additional-devs" simple-audio-card,convert-rate: $ref: "#/definitions/convert-rate" simple-audio-card,convert-channels:
@@ -359,6 +370,48 @@ examples: }; };
+# -------------------- +# route audio to/from a codec through an amplifier +# designed with a potentiometer driven by IIO: +# --------------------
- |
- sound {
compatible = "simple-audio-card";simple-audio-card,aux-devs = <&_in>, <&_out>;simple-audio-card,routing ="CODEC LEFTIN", "AMP_IN LEFT OUT","CODEC RIGHTIN", "AMP_IN RIGHT OUT","AMP_OUT LEFT IN", "CODEC LEFTOUT","AMP_OUT RIGHT IN", "CODEC RIGHTOUT";simple-audio-card,additional-devs {amp_out: iio-aux-out {compatible = "audio-iio-aux";io-channels = <&pot_out 0>, <&pot_out 1>;io-channel-names = "LEFT", "RIGHT";snd-control-invert-range = <1 1>;sound-name-prefix = "AMP_OUT";};amp_in: iio_aux-in {compatible = "audio-iio-aux";io-channels = <&pot_in 0>, <&pot_in 1>;io-channel-names = "LEFT", "RIGHT";sound-name-prefix = "AMP_IN";};};simple-audio-card,cpu {sound-dai = <&cpu>;};simple-audio-card,codec {sound-dai = <&codec>;clocks = <&clocks>;};- };
# -------------------- # Sampling Rate Conversion # --------------------