Document the bindings used for the Cadence MHDP DPI/DP bridge.

Signed-off-by: Damian Kos <d...@cadence.com>
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 .../bindings/display/bridge/cdns,mhdp.txt          |   39 ++++++++++++++++++++
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Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt

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+Cadence MHDP bridge
+==========================
+
+The Cadence MHDP bridge is a DPI to DP bridge.
+
+Required properties:
+ - compatible: should be "cdns,mhdp",
+ - reg: physical base address and length of the controller's registers,
+ - clocks: DP bridge clock, it's used by the IP to know how to translate
+          a number of clock cycles into a time (which is used to comply
+          with DP standard timings and delays),
+ - clock-names: must be "clk",
+
+Required subnodes:
+ - ports: Ports as described in Documentation/devictree/bindings/graph.txt
+   Currently contains a single input port at address 0 representing the DPI
+   input.
+   Port 0 should be connected to a DPI encoder output.
+
+Example:
+
+       mhdp: mhdp@0xf0fb000000 {
+               compatible = "cdns,mhdp";
+               reg = <0xf0 0xfb000000 0x0 0x1000000>;
+               clocks = <&mhdp_clock>;
+               clock-names = "clk";
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@0 {
+                               reg = <0>;
+                               mhdp0_dpi_input: endpoint {
+                                       remote-endpoint = <&xxx_dpi_output>;
+                               };
+                       };
+               };
+       };
-- 
1.7.1

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