FROMLIST: dt-bindings: Add ANX6345 DP/eDP transmitter binding

The ANX6345 is an ultra-low power DisplayPort/eDP transmitter designed
for portable devices.

Add a binding document for it.

Change-Id: Ie4200b390c6c0b6f19abdcb3eb2aca8a8314e82b
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181018073327.64942-5-icenowy@aosc.io

Documentation/devicetree/bindings/display/bridge/anx6345.txt

@@ -0,0 +1,39 @@
+Analogix ANX6345 eDP Transmitter
+--------------------------------
+
+The ANX6345 is an ultra-low power Full-HD eDP transmitter designed for
+portable devices.
+
+Required properties:
+
+ - compatible		: "analogix,anx6345"
+ - reg			: I2C address of the device
+ - reset-gpios		: Which GPIO to use for reset
+
+Optional properties:
+
+ - dvdd12-supply	: Regulator for 1.2V digital core power.
+ - dvdd25-supply	: Regulator for 2.5V digital core power.
+ - panel-supply		: Regulator for the power of the panel.
+ - edid			: verbatim EDID data block describing attached
+			  panel, only used when the panel has no EDID info.
+ - Video port for RGB input, using the DT bindings defined in [1].
+
+[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+anx6345: anx6345@38 {
+	compatible = "analogix,anx6345";
+	reg = <0x38>;
+	reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* PD24 */
+	panel-supply = <&reg_dc1sw>;
+	dvdd25-supply = <&reg_dldo2>;
+	dvdd12-supply = <&reg_fldo1>;
+
+	port {
+		anx6345_in: endpoint {
+			remote-endpoint = <&tcon0_out_anx6345>;
+		};
+	};
+};