linux/Documentation/devicetree/bindings/gpio/gpio-adnp.txt
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   1Avionic Design N-bit GPIO expander bindings
   2
   3Required properties:
   4- compatible: should be "ad,gpio-adnp"
   5- reg: The I2C slave address for this device.
   6- interrupt-parent: phandle of the parent interrupt controller.
   7- interrupts: Interrupt specifier for the controllers interrupt.
   8- #gpio-cells: Should be 2. The first cell is the GPIO number and the
   9  second cell is used to specify optional parameters:
  10  - bit 0: polarity (0: normal, 1: inverted)
  11- gpio-controller: Marks the device as a GPIO controller
  12- nr-gpios: The number of pins supported by the controller.
  13
  14The GPIO expander can optionally be used as an interrupt controller, in
  15which case it uses the default two cell specifier as described in
  16Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
  17
  18Example:
  19
  20        gpioext: gpio-controller@41 {
  21                compatible = "ad,gpio-adnp";
  22                reg = <0x41>;
  23
  24                interrupt-parent = <&gpio>;
  25                interrupts = <160 1>;
  26
  27                gpio-controller;
  28                #gpio-cells = <2>;
  29
  30                interrupt-controller;
  31                #interrupt-cells = <2>;
  32
  33                nr-gpios = <64>;
  34        };
  35