ASoC: gtm601: Document GTM601 bindings

Add small documentation for GTM601 UMTS modem audio interface.

Signed-off-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/gtm601.txt b/Documentation/devicetree/bindings/sound/gtm601.txt
new file mode 100644
index 000000000000..5efc8c068de0
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/gtm601.txt
@@ -0,0 +1,13 @@
+GTM601 UMTS modem audio interface CODEC
+
+This device has no configuration interface. Sample rate is fixed - 8kHz.
+
+Required properties:
+
+  - compatible : "option,gtm601"
+
+Example:
+
+codec: gtm601_codec {
+        compatible = "option,gtm601";
+};