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     1 * Atmel GPIO controller (PIO)
    2 
    3 Required 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 
   16 optional properties:
   17 - #gpio-lines: Number of gpio if absent 32.
   18 
   19 
   20 Example:
   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 
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