Add documentation for Chrome EC codec driver.

Signed-off-by: Cheng-Yi Chiang <cychi...@chromium.org>
---
 Change in v2: Fixed name of driver in MAINTAINERS.

 .../bindings/sound/google,cros-ec-codec.txt   | 24 +++++++++++++++++++
 MAINTAINERS                                   |  5 ++++
 2 files changed, 29 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt

diff --git a/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt 
b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
new file mode 100644
index 0000000000000..57718382b3a36
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
@@ -0,0 +1,24 @@
+* Audio codec controlled by ChromeOS EC
+
+Google's ChromeOS EC codec is a digital mic codec provided by the
+Embedded Controller (EC) and is controlled via a host-command interface.
+
+An EC codec node should only be found as a sub-node of the EC node (see
+Documentation/devicetree/bindings/mfd/cros-ec.txt).
+
+Required properties:
+- compatible: Must contain "google,cros-ec-codec"
+- #sound-dai-cells: Should be 1. The cell specifies number of DAIs.
+
+Example:
+
+cros-ec@0 {
+       compatible = "google,cros-ec-spi";
+
+       ...
+
+       cros_ec_codec: ec-codec {
+               compatible = "google,cros-ec-codec";
+               #sound-dai-cells = <1>;
+       };
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 5b9c6af98283b..05e1922624e58 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3636,6 +3636,11 @@ S:       Maintained
 T:     git 
git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform.git
 F:     drivers/platform/chrome/
 
+CHROMEOS EC CODEC DRIVER
+M:     Cheng-Yi Chiang <cychi...@chromium.org>
+S:     Maintained
+F:     Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
+
 CIRRUS LOGIC AUDIO CODEC DRIVERS
 M:     Brian Austin <brian.aus...@cirrus.com>
 M:     Paul Handrigan <paul.handri...@cirrus.com>
-- 
2.20.1.415.g653613c723-goog

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