ASoC: add DT documentation for the sound-name-prefix property

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/name-prefix.txt b/Documentation/devicetree/bindings/sound/name-prefix.txt
new file mode 100644 (file)
index 0000000..6457759
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/name-prefix.txt
@@ -0,0 +1,24 @@
+Name prefix:
+
+Card implementing the routing property define the connection between
+audio components as list of string pair. Component using the same
+sink/source names may use the name prefix property to prepend the
+name of their sinks/sources with the provided string.
+
+Optional name prefix property:
+- sound-name-prefix : string using as prefix for the sink/source names of
+                     the component.
+
+Example: Two instances of the same component.
+
+amp0: analog-amplifier@0 {
+       compatible = "simple-audio-amplifier";
+       enable-gpios = <&gpio GPIOH_3 0>;
+       sound-name-prefix = "FRONT";
+};
+
+amp1: analog-amplifier@1 {
+       compatible = "simple-audio-amplifier";
+       enable-gpios = <&gpio GPIOH_4 0>;
+       sound-name-prefix = "BACK";
+};