* Technologic Systems I2C-FPGA's GPIO controller bindings

This bindings describes the GPIO controller for Technologic's FPGA core.
TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA
uses 2 bits: it doesn't use a dedicated input bit.

Required properties:
- compatible: Should be one of the following
		"technologic,ts4900-gpio"
		"technologic,ts7970-gpio"
- reg: Physical base address of the controller and length
       of memory mapped region.
- #gpio-cells: Should be two. The first cell is the pin number.
- gpio-controller: Marks the device node as a gpio controller.

Optional property:
- ngpios: Number of GPIOs this controller is instantiated with,
  the default is 32. See gpio.txt for more details.

Example:

&i2c2 {
	gpio8: gpio@28 {
		compatible = "technologic,ts4900-gpio";
		reg = <0x28>;
		#gpio-cells = <2>;
		gpio-controller;
		ngpios = <32>;
	};
};