1* ARM Versatile FPGA interrupt controller
   3One or more FPGA IRQ controllers can be synthesized in an ARM reference board
   4such as the Integrator or Versatile family. The output of these different
   5controllers are OR:ed together and fed to the CPU tile's IRQ input. Each
   6instance can handle up to 32 interrupts.
   8Required properties:
   9- compatible: "arm,versatile-fpga-irq"
  10- interrupt-controller: Identifies the node as an interrupt controller
  11- #interrupt-cells: The number of cells to define the interrupts.  Must be 1
  12  as the FPGA IRQ controller has no configuration options for interrupt
  13  sources.  The cell is a u32 and defines the interrupt number.
  14- reg: The register bank for the FPGA interrupt controller.
  15- clear-mask: a u32 number representing the mask written to clear all IRQs
  16  on the controller at boot for example.
  17- valid-mask: a u32 number representing a bit mask determining which of
  18  the interrupts are valid. Unconnected/unused lines are set to 0, and
  19  the system till not make it possible for devices to request these
  20  interrupts.
  24pic: pic@14000000 {
  25        compatible = "arm,versatile-fpga-irq";
  26        #interrupt-cells = <1>;
  27        interrupt-controller;
  28        reg = <0x14000000 0x100>;
  29        clear-mask = <0xffffffff>;
  30        valid-mask = <0x003fffff>;