* SiS I2C Multiple Touch Controller

Required properties:
- compatible: must be "sis,9200-ts"
- reg: i2c slave address
- interrupts: touch controller interrupt (see interrupt
  binding [0])

Optional properties:
- pinctrl-names: should be "default" (see pinctrl binding [1]).
- pinctrl-0: a phandle pointing to the pin settings for the
  device (see pinctrl binding [1]).
- attn-gpios: the gpio pin used as attention line
- reset-gpios: the gpio pin used to reset the controller
- wakeup-source: touchscreen can be used as a wakeup source

[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

Example:

	sis9255@5c  {
		compatible = "sis,9200-ts";
		reg = <0x5c>;
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_sis>;
		interrupt-parent = <&gpio3>;
		interrupts = <19 IRQ_TYPE_EDGE_FALLING>;
		irq-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;
		reset-gpios = <&gpio2 30 GPIO_ACTIVE_LOW>;
	};
