panel/s6e8aa0: add DT bindings

The patch adds bindings for s6e8aa0 panel.
Bindings describes panel resources, boot delays,
display timings, orientation and physical size.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/Documentation/devicetree/bindings/panel/samsung,s6e8aa0.txt b/Documentation/devicetree/bindings/panel/samsung,s6e8aa0.txt
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+Samsung S6E8AA0 AMOLED LCD 5.3 inch panel
+
+Required properties:
+  - compatible: "samsung,s6e8aa0"
+  - reg: the virtual channel number of a DSI peripheral
+  - vdd3-supply: core voltage supply
+  - vci-supply: voltage supply for analog circuits
+  - reset-gpios: a GPIO spec for the reset pin
+  - display-timings: timings for the connected panel as described by [1]
+
+Optional properties:
+  - power-on-delay: delay after turning regulators on [ms]
+  - reset-delay: delay after reset sequence [ms]
+  - init-delay: delay after initialization sequence [ms]
+  - panel-width-mm: physical panel width [mm]
+  - panel-height-mm: physical panel height [mm]
+  - flip-horizontal: boolean to flip image horizontally
+  - flip-vertical: boolean to flip image vertically
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in [2]. This
+node should describe panel's video bus.
+
+[1]: Documentation/devicetree/bindings/video/display-timing.txt
+[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+       panel {
+               compatible = "samsung,s6e8aa0";
+               reg = <0>;
+               vdd3-supply = <&vcclcd_reg>;
+               vci-supply = <&vlcd_reg>;
+               reset-gpios = <&gpy4 5 0>;
+               power-on-delay= <50>;
+               reset-delay = <100>;
+               init-delay = <100>;
+               panel-width-mm = <58>;
+               panel-height-mm = <103>;
+               flip-horizontal;
+               flip-vertical;
+
+               display-timings {
+                       timing0: timing-0 {
+                               clock-frequency = <57153600>;
+                               hactive = <720>;
+                               vactive = <1280>;
+                               hfront-porch = <5>;
+                               hback-porch = <5>;
+                               hsync-len = <5>;
+                               vfront-porch = <13>;
+                               vback-porch = <1>;
+                               vsync-len = <2>;
+                       };
+               };
+       };