video: clps711x: Add bindings documentation for CLPS711X framebuffer

Add OF document for Cirrus Logic CLPS711X framebuffer driver.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/Documentation/devicetree/bindings/video/cirrus,clps711x-fb.txt b/Documentation/devicetree/bindings/video/cirrus,clps711x-fb.txt
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+* Currus Logic CLPS711X Framebuffer
+
+Required properties:
+- compatible: Shall contain "cirrus,clps711x-fb".
+- reg       : Physical base address and length of the controller's registers +
+              location and size of the framebuffer memory.
+- clocks    : phandle + clock specifier pair of the FB reference clock.
+- display   : phandle to a display node as described in
+              Documentation/devicetree/bindings/video/display-timing.txt.
+              Additionally, the display node has to define properties:
+  - bits-per-pixel: Bits per pixel.
+  - ac-prescale   : LCD AC bias frequency. This frequency is the required
+                    AC bias frequency for a given manufacturer's LCD plate.
+  - cmap-invert   : Invert the color levels (Optional).
+
+Optional properties:
+- lcd-supply: Regulator for LCD supply voltage.
+
+Example:
+       fb: fb@800002c0 {
+               compatible = "cirrus,ep7312-fb", "cirrus,clps711x-fb";
+               reg = <0x800002c0 0xd44>, <0x60000000 0xc000>;
+               clocks = <&clks 2>;
+               lcd-supply = <&reg5v0>;
+               display = <&display>;
+       };
+
+       display: display {
+               model = "320x240x4";
+               native-mode = <&timing0>;
+               bits-per-pixel = <4>;
+               ac-prescale = <17>;
+
+               display-timings {
+                       timing0: 320x240 {
+                               hactive = <320>;
+                               hback-porch = <0>;
+                               hfront-porch = <0>;
+                               hsync-len = <0>;
+                               vactive = <240>;
+                               vback-porch = <0>;
+                               vfront-porch = <0>;
+                               vsync-len = <0>;
+                               clock-frequency = <6500000>;
+                       };
+               };
+       };