ASoC: add S/PDIF support to Armada 370 DB ASoC driver

The Armada 370 DB board not only has analog audio input/output, but
also S/PDIF input/output. This commit adds support for S/PDIF in the
ASoC machine driver of the Armada 370 DB platform, and adjusts the
Device Tree bindings documentation accordingly.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/sound/armada-370db-audio.txt b/Documentation/devicetree/bindings/sound/armada-370db-audio.txt
index 3893b4d15a20..bf984d238620 100644
--- a/Documentation/devicetree/bindings/sound/armada-370db-audio.txt
+++ b/Documentation/devicetree/bindings/sound/armada-370db-audio.txt
@@ -11,14 +11,17 @@ Mandatory properties:
  * marvell,audio-controller: a phandle that points to the audio
    controller of the Armada 370 SoC.
 
- * marvell,audio-codec: a phandle that points to the analog audio
-   codec connected to the Armada 370 SoC.
+ * marvell,audio-codec: a set of three phandles that points to:
+
+    1/ the analog audio codec connected to the Armada 370 SoC
+    2/ the S/PDIF transceiver
+    3/ the S/PDIF receiver
 
 Example:
 
 	sound {
 	      compatible = "marvell,a370db-audio";
 	      marvell,audio-controller = <&audio_controller>;
-	      marvell,audio-codec = <&audio_codec>;
+	      marvell,audio-codec = <&audio_codec &spdif_out &spdif_in>;
 	      status = "okay";
 	};