Add bindings documentation for the i.MX media driver.

Signed-off-by: Steve Longerbeam <redacted>
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 Documentation/devicetree/bindings/media/imx.txt | 66 +++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/imx.txt

diff --git a/Documentation/devicetree/bindings/media/imx.txt b/Documentation/devicetree/bindings/media/imx.txt
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+Freescale i.MX Media Video Device
+=================================
+
+Video Media Controller node
+---------------------------
+
+This is the media controller node for video capture support. It is a
+virtual device that lists the camera serial interface nodes that the
+media device will control.
+
+Required properties:
+- compatible : "fsl,imx-capture-subsystem";
+- ports      : Should contain a list of phandles pointing to camera
+		sensor interface ports of IPU devices
+
+example:
+
+capture-subsystem {
+	compatible = "fsl,capture-subsystem";