Nest Labs GPIO Exporter
=========================

This is a psuedo-device that captures the set of GPIOs used by a device
that is managed using a userspace driver.  All GPIOs identified within
this node will be exported to userspace via sysfs using the names given.

Required Properties:
-------------------
- compatible: "nestlabs,gpio-exporter"
- reg: This must be zero to ensure a consistent sysfs path

Optional Properties:
-------------------
- output-names: a list of strings to be used for the output-gpios.
- output-gpios: a list of gpios that will be exported using the matching
		output-names strings.  They will get their direction set
		as output.
- input-names: a list of strings to be used for the input-gpios.
- input-gpios: a list of gpios that will be exported using the matching
	       input-names strings.  They will get their direction set
	       as input.

Example:

em35x-gpios {
	reg = <0x0 0>;
	compatible = "nestlabs,gpio-exporter";
	output-names = "reset", "wake";
	output-gpios = <&gpio2 0 GPIO_ACTIVE_HIGH
		 &gpio2 5 GPIO_ACTIVE_HIGH>;
	input-names = "irq";
	input-gpios = <&gpio2 4 GPIO_ACTIVE_HIGH>;
};