1* Atmel GPIO controller (PIO) 2 3Required properties: 4- compatible: "atmel,<chip>-gpio", where <chip> is at91rm9200 or at91sam9x5. 5- reg: Should contain GPIO controller registers location and length 6- interrupts: Should be the port interrupt shared by all the pins. 7- #gpio-cells: Should be two. The first cell is the pin number and 8 the second cell is used to specify optional parameters to declare if the GPIO 9 is active high or low. See gpio.txt. 10- gpio-controller: Marks the device node as a GPIO controller. 11- interrupt-controller: Marks the device node as an interrupt controller. 12- #interrupt-cells: Should be two. The first cell is the pin number and the 13 second cell is used to specify irq type flags, see the two cell description 14 in interrupt-controller/interrupts.txt for details. 15 16optional properties: 17- #gpio-lines: Number of gpio if absent 32. 18 19 20Example: 21 pioA: gpio@fffff200 { 22 compatible = "atmel,at91rm9200-gpio"; 23 reg = <0xfffff200 0x100>; 24 interrupts = <2 4>; 25 #gpio-cells = <2>; 26 gpio-controller; 27 #gpio-lines = <19>; 28 interrupt-controller; 29 #interrupt-cells = <2>; 30 }; 31 32