Texas Instruments TPS65217 and TPS65218 power button

This module is part of the TPS65217/TPS65218. For more details about the whole
TPS65217 chip see Documentation/devicetree/bindings/regulator/tps65217.txt.

This driver provides a simple power button event via an Interrupt.

Required properties:
- compatible: should be "ti,tps65217-pwrbutton" or "ti,tps65218-pwrbutton"

Required properties:
- interrupts: should be one of the following
   - <2>: For controllers compatible with tps65217
   - <3 IRQ_TYPE_EDGE_BOTH>: For controllers compatible with tps65218

Examples:

&tps {
	tps65217-pwrbutton {
		compatible = "ti,tps65217-pwrbutton";
		interrupts = <2>;
	};
};

&tps {
	power-button {
		compatible = "ti,tps65218-pwrbutton";
		interrupts = <3 IRQ_TYPE_EDGE_BOTH>;
	};
};