linux/Documentation/devicetree/bindings/x86/interrupt.txt
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   1Interrupt chips
   2---------------
   3
   4* Intel I/O Advanced Programmable Interrupt Controller (IO APIC)
   5
   6  Required properties:
   7  --------------------
   8     compatible = "intel,ce4100-ioapic";
   9     #interrupt-cells = <2>;
  10
  11  Device's interrupt property:
  12
  13     interrupts = <P S>;
  14
  15  The first number (P) represents the interrupt pin which is wired to the
  16  IO APIC. The second number (S) represents the sense of interrupt which
  17  should be configured and can be one of:
  18    0 - Edge Rising
  19    1 - Level Low
  20    2 - Level High
  21    3 - Edge Falling
  22
  23* Local APIC
  24  Required property:
  25
  26     compatible = "intel,ce4100-lapic";
  27