linux/Documentation/devicetree/bindings/arm/atmel-aic.txt
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   1* Advanced Interrupt Controller (AIC)
   2
   3Required properties:
   4- compatible: Should be "atmel,<chip>-aic"
   5- interrupt-controller: Identifies the node as an interrupt controller.
   6- interrupt-parent: For single AIC system, it is an empty property.
   7- #interrupt-cells: The number of cells to define the interrupts. It should be 3.
   8  The first cell is the IRQ number (aka "Peripheral IDentifier" on datasheet).
   9  The second cell is used to specify flags:
  10    bits[3:0] trigger type and level flags:
  11      1 = low-to-high edge triggered.
  12      2 = high-to-low edge triggered.
  13      4 = active high level-sensitive.
  14      8 = active low level-sensitive.
  15      Valid combinations are 1, 2, 3, 4, 8.
  16      Default flag for internal sources should be set to 4 (active high).
  17  The third cell is used to specify the irq priority from 0 (lowest) to 7
  18  (highest).
  19- reg: Should contain AIC registers location and length
  20- atmel,external-irqs: u32 array of external irqs.
  21
  22Examples:
  23        /*
  24         * AIC
  25         */
  26        aic: interrupt-controller@fffff000 {
  27                compatible = "atmel,at91rm9200-aic";
  28                interrupt-controller;
  29                interrupt-parent;
  30                #interrupt-cells = <3>;
  31                reg = <0xfffff000 0x200>;
  32        };
  33
  34        /*
  35         * An interrupt generating device that is wired to an AIC.
  36         */
  37        dma: dma-controller@ffffec00 {
  38                compatible = "atmel,at91sam9g45-dma";
  39                reg = <0xffffec00 0x200>;
  40                interrupts = <21 4 5>;
  41        };
  42