Add bindings documentation for i.MX7 media drivers.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
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 .../devicetree/bindings/media/imx7.txt        | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/imx7.txt

diff --git a/Documentation/devicetree/bindings/media/imx7.txt b/Documentation/devicetree/bindings/media/imx7.txt
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+Freescale i.MX7 Media Video Device
+==================================
+
+mipi_csi2 node
+--------------
+
+This is the device node for the MIPI CSI-2 receiver core in i.MX7 SoC. It is
+compatible with previous version of Samsung D-phy.
+
+Required properties:
+
+- compatible    : "fsl,imx7-mipi-csi2";
+- reg           : base address and length of the register set for the device;
+- interrupts    : should contain MIPI CSIS interrupt;
+- clocks        : list of clock specifiers, see
+        Documentation/devicetree/bindings/clock/clock-bindings.txt for details;
+- clock-names   : must contain "pclk", "wrap" and "phy" entries, matching
+                  entries in the clock property;
+- power-domains : a phandle to the power domain, see
+          Documentation/devicetree/bindings/power/power_domain.txt for details.
+- reset-names   : should include following entry "mrst";
+- resets        : a list of phandle, should contain reset entry of
+                  reset-names;
+- phy-supply    : from the generic phy bindings, a phandle to a regulator that
+	          provides power to MIPI CSIS core;
+- bus-width     : maximum number of data lanes supported (SoC specific);
+
+Optional properties:
+
+- clock-frequency : The IP's main (system bus) clock frequency in Hz, default
+		    value when this property is not specified is 166 MHz;