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* Samsung S6SY761 touchscreen controller

Required properties:
- compatible		: must be "samsung,s6sy761"
- reg			: I2C slave address, (e.g. 0x48)
- interrupts		: interrupt specification
- avdd-supply		: analogic power supply
- vdd-supply		: power supply

Optional properties:
- touchscreen-size-x	: see touchscreen.txt. This property is embedded in the
			  device. If defined it forces a different x resolution.
- touchscreen-size-y	: see touchscreen.txt. This property is embedded in the
			  device. If defined it forces a different y resolution.

Example:

i2c@00000000 {

	/* ... */

	touchscreen@48 {
		compatible = "samsung,s6sy761";
		reg = <0x48>;
		interrupt-parent = <&gpa1>;
		interrupts = <1 IRQ_TYPE_NONE>;
		avdd-supply = <&ldo30_reg>;
		vdd-supply = <&ldo31_reg>;
		touchscreen-size-x = <4096>;
		touchscreen-size-y = <4096>;
	};
};