ubuntu-linux-kernel/Documentation/devicetree/bindings/input/touchscreen/egalax-ts.txt

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* EETI eGalax Multiple Touch Controller
Required properties:
- compatible: must be "eeti,egalax_ts"
- reg: i2c slave address
- interrupt-parent: the phandle for the interrupt controller
- interrupts: touch controller interrupt
- wakeup-gpios: the gpio pin to be used for waking up the controller
and also used as irq pin
Example:
touchscreen@4 {
compatible = "eeti,egalax_ts";
reg = <0x04>;
interrupt-parent = <&gpio1>;
interrupts = <9 2>;
wakeup-gpios = <&gpio1 9 0>;
};