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