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ptn3460 bridge bindings

Required properties:
	- compatible: "nxp,ptn3460"
	- reg: i2c address of the bridge
	- powerdown-gpio: OF device-tree gpio specification
	- reset-gpio: OF device-tree gpio specification
	- edid-emulation: The EDID emulation entry to use
		+-------+------------+------------------+
		| Value | Resolution | Description      |
		|   0   |  1024x768  | NXP Generic      |
		|   1   |  1920x1080 | NXP Generic      |
		|   2   |  1920x1080 | NXP Generic      |
		|   3   |  1600x900  | Samsung LTM200KT |
		|   4   |  1920x1080 | Samsung LTM230HT |
		|   5   |  1366x768  | NXP Generic      |
		|   6   |  1600x900  | ChiMei M215HGE   |
		+-------+------------+------------------+

Example:
	lvds-bridge@20 {
		compatible = "nxp,ptn3460";
		reg = <0x20>;
		powerdown-gpio = <&gpy2 5 1 0 0>;
		reset-gpio = <&gpx1 5 1 0 0>;
		edid-emulation = <5>;
	};