4 - compatible: Should be "lsi,zevio-gpio"
5 - reg: Address and length of the register set for the device
6 - #gpio-cells: Should be two. The first cell is the pin number and the
7 second cell is used to specify optional parameters (currently unused).
8 - gpio-controller: Marks the device node as a GPIO controller.
12 compatible = "lsi,zevio-gpio";
13 reg = <0x90000000 0x1000>;