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Onkey driver for MAX77650 PMIC from Maxim Integrated.

This module is part of the MAX77650 MFD device. For more details
see Documentation/devicetree/bindings/mfd/max77650.txt.

The onkey controller is represented as a sub-node of the PMIC node on
the device tree.

Required properties:
--------------------
- compatible:		Must be "maxim,max77650-onkey".

Optional properties:
- linux,code:		The key-code to be reported when the key is pressed.
			Defaults to KEY_POWER.
- maxim,onkey-slide:	The system's button is a slide switch, not the default
			push button.

Example:
--------

	onkey {
		compatible = "maxim,max77650-onkey";
		linux,code = <KEY_END>;
		maxim,onkey-slide;
	};