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:
19 - interrupt-controller : Identifies the node as an interrupt controller
20 - #interrupt-cells : Specifies the number of cells needed to encode an
21 interrupt source. The type shall be a <u32> and the value shall be 3.
23 The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
26 The 2nd cell contains the interrupt number for the interrupt type.
27 SPI interrupts are in the range [0-987]. PPI interrupts are in the
30 The 3rd cell is the flags, encoded as follows:
31 bits[3:0] trigger type and level flags.
32 1 = low-to-high edge triggered
33 2 = high-to-low edge triggered
34 4 = active high level-sensitive
35 8 = active low level-sensitive
36 bits[15:8] PPI interrupt cpu mask. Each bit corresponds to each of
37 the 8 possible cpus attached to the GIC. A bit set to '1' indicated
38 the interrupt is wired to that CPU. Only valid for PPI interrupts.
40 - reg : Specifies base physical address(s) and size of the GIC registers. The
41 first region is the GIC distributor register base and size. The 2nd region is
42 the GIC cpu interface register base and size.
45 - interrupts : Interrupt source of the parent interrupt controller on
46 secondary GICs, or VGIC maintenance interrupt on primary GIC (see
49 - cpu-offset : per-cpu offset within the distributor and cpu interface
50 regions, used when the GIC doesn't have banked registers. The offset is
55 intc: interrupt-controller@fff11000 {
56 compatible = "arm,cortex-a9-gic";
57 #interrupt-cells = <3>;
60 reg = <0xfff11000 0x1000>,
65 * GIC virtualization extensions (VGIC)
67 For ARM cores that support the virtualization extensions, additional
68 properties must be described (they only exist if the GIC is the
69 primary interrupt controller).
73 - reg : Additional regions specifying the base physical address and
74 size of the VGIC registers. The first additional region is the GIC
75 virtual interface control register base and size. The 2nd additional
76 region is the GIC virtual cpu interface register base and size.
78 - interrupts : VGIC maintenance interrupt.
82 interrupt-controller@2c001000 {
83 compatible = "arm,cortex-a15-gic";
84 #interrupt-cells = <3>;
86 reg = <0x2c001000 0x1000>,
90 interrupts = <1 9 0xf04>;