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diff --git a/kernel/Documentation/devicetree/bindings/sound/gtm601.txt b/kernel/Documentation/devicetree/bindings/sound/gtm601.txt
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+++ b/kernel/Documentation/devicetree/bindings/sound/gtm601.txt
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+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";
+};