* Atmel GPIO controller (PIO) Required properties: - compatible: "atmel,-gpio", where is at91rm9200 or at91sam9x5. - reg: Should contain GPIO controller registers location and length - interrupts: Should be the port interrupt shared by all the pins. - #gpio-cells: Should be two. The first cell is the pin number and the second cell is used to specify optional parameters (currently unused). - gpio-controller: Marks the device node as a GPIO controller. optional properties: - #gpio-lines: Number of gpio if absent 32. Example: pioA: gpio@fffff200 { compatible = "atmel,at91rm9200-gpio"; reg = <0xfffff200 0x100>; interrupts = <2 4>; #gpio-cells = <2>; gpio-controller; #gpio-lines = <19>; };