1 * ARM Generic Interrupt Controller
3 ARM SMP cores are often associated with a GIC, providing per processor
4 interrupts (PPI), shared processor interrupts (SPI) and software
5 generated interrupts (SGI).
7 Primary GIC is attached directly to the CPU and typically has PPIs and SGIs.
8 Secondary GICs are cascaded into the upward interrupt controller and do not
11 Main node required properties:
13 - compatible : should be one of:
16 - interrupt-controller : Identifies the node as an interrupt controller
17 - #interrupt-cells : Specifies the number of cells needed to encode an
18 interrupt source. The type shall be a <u32> and the value shall be 3.
20 The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
23 The 2nd cell contains the interrupt number for the interrupt type.
24 SPI interrupts are in the range [0-987]. PPI interrupts are in the
27 The 3rd cell is the flags, encoded as follows:
28 bits[3:0] trigger type and level flags.
29 1 = low-to-high edge triggered
30 2 = high-to-low edge triggered
31 4 = active high level-sensitive
32 8 = active low level-sensitive
33 bits[15:8] PPI interrupt cpu mask. Each bit corresponds to each of
34 the 8 possible cpus attached to the GIC. A bit set to '1' indicated
35 the interrupt is wired to that CPU. Only valid for PPI interrupts.
37 - reg : Specifies base physical address(s) and size of the GIC registers. The
38 first region is the GIC distributor register base and size. The 2nd region is
39 the GIC cpu interface register base and size.
42 - interrupts : Interrupt source of the parent interrupt controller. Only
43 present on secondary GICs.
45 - cpu-offset : per-cpu offset within the distributor and cpu interface
46 regions, used when the GIC doesn't have banked registers. The offset is
51 intc: interrupt-controller@fff11000 {
52 compatible = "arm,cortex-a9-gic";
53 #interrupt-cells = <3>;
56 reg = <0xfff11000 0x1000>,