linux/Documentation/devicetree/bindings/gpio/8xxx_gpio.txt
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   1GPIO controllers on MPC8xxx SoCs
   2
   3This is for the non-QE/CPM/GUTs GPIO controllers as found on
   48349, 8572, 8610 and compatible.
   5
   6Every GPIO controller node must have #gpio-cells property defined,
   7this information will be used to translate gpio-specifiers.
   8
   9Required properties:
  10- compatible : "fsl,<CHIP>-gpio" followed by "fsl,mpc8349-gpio" for
  11  83xx, "fsl,mpc8572-gpio" for 85xx and "fsl,mpc8610-gpio" for 86xx.
  12- #gpio-cells : Should be two. The first cell is the pin number and the
  13  second cell is used to specify optional parameters (currently unused).
  14 - interrupts : Interrupt mapping for GPIO IRQ.
  15 - interrupt-parent : Phandle for the interrupt controller that
  16   services interrupts for this device.
  17- gpio-controller : Marks the port as GPIO controller.
  18
  19Example of gpio-controller nodes for a MPC8347 SoC:
  20
  21        gpio1: gpio-controller@c00 {
  22                #gpio-cells = <2>;
  23                compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
  24                reg = <0xc00 0x100>;
  25                interrupts = <74 0x8>;
  26                interrupt-parent = <&ipic>;
  27                gpio-controller;
  28        };
  29
  30        gpio2: gpio-controller@d00 {
  31                #gpio-cells = <2>;
  32                compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
  33                reg = <0xd00 0x100>;
  34                interrupts = <75 0x8>;
  35                interrupt-parent = <&ipic>;
  36                gpio-controller;
  37        };
  38
  39See booting-without-of.txt for details of how to specify GPIO
  40information for devices.
  41
  42To use GPIO pins as interrupt sources for peripherals, specify the
  43GPIO controller as the interrupt parent and define GPIO number +
  44trigger mode using the interrupts property, which is defined like
  45this:
  46
  47interrupts = <number trigger>, where:
  48 - number: GPIO pin (0..31)
  49 - trigger: trigger mode:
  50        2 = trigger on falling edge
  51        3 = trigger on both edges
  52
  53Example of device using this is:
  54
  55        funkyfpga@0 {
  56                compatible = "funky-fpga";
  57                ...
  58                interrupts = <4 3>;
  59                interrupt-parent = <&gpio1>;
  60        };
  61