linux/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
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   1* Marvell PXA GPIO controller
   2
   3Required properties:
   4- compatible : Should be "intel,pxa25x-gpio", "intel,pxa26x-gpio",
   5                "intel,pxa27x-gpio", "intel,pxa3xx-gpio",
   6                "marvell,pxa93x-gpio", "marvell,mmp-gpio" or
   7                "marvell,mmp2-gpio".
   8- reg : Address and length of the register set for the device
   9- interrupts : Should be the port interrupt shared by all gpio pins.
  10  There're three gpio interrupts in arch-pxa, and they're gpio0,
  11  gpio1 and gpio_mux. There're only one gpio interrupt in arch-mmp,
  12  gpio_mux.
  13- interrupt-name : Should be the name of irq resource. Each interrupt
  14  binds its interrupt-name.
  15- interrupt-controller : Identifies the node as an interrupt controller.
  16- #interrupt-cells: Specifies the number of cells needed to encode an
  17  interrupt source.
  18- gpio-controller : Marks the device node as a gpio controller.
  19- #gpio-cells : Should be one.  It is the pin number.
  20
  21Example:
  22
  23        gpio: gpio@d4019000 {
  24                compatible = "marvell,mmp-gpio";
  25                reg = <0xd4019000 0x1000>;
  26                interrupts = <49>;
  27                interrupt-name = "gpio_mux";
  28                gpio-controller;
  29                #gpio-cells = <1>;
  30                interrupt-controller;
  31                #interrupt-cells = <1>;
  32      };
  33
  34* Marvell Orion GPIO Controller
  35
  36Required properties:
  37- compatible         : Should be "marvell,orion-gpio"
  38- reg                : Address and length of the register set for controller.
  39- gpio-controller    : So we know this is a gpio controller.
  40- ngpio              : How many gpios this controller has.
  41- interrupts         : Up to 4 Interrupts for the controller.
  42
  43Optional properties:
  44- mask-offset        : For SMP Orions, offset for Nth CPU
  45
  46Example:
  47
  48                gpio0: gpio@10100 {
  49                        compatible = "marvell,orion-gpio";
  50                        #gpio-cells = <2>;
  51                        gpio-controller;
  52                        reg = <0x10100 0x40>;
  53                        ngpio = <32>;
  54                        interrupts = <35>, <36>, <37>, <38>;
  55                };
  56