1 Axis ETRAX FS General I/O controller bindings
7 - reg: Physical base address and length of the controller's registers.
8 - #gpio-cells: Should be 3
9 - The first cell is the gpio offset number.
10 - The second cell is reserved and is currently unused.
11 - The third cell is the port number (hex).
12 - gpio-controller: Marks the device node as a GPIO controller.
17 compatible = "axis,etraxfs-gio";
18 reg = <0xb001a000 0x1000>;