1 MIPS Global Interrupt Controller (GIC)
3 The MIPS GIC routes external interrupts to individual VPEs and IRQ pins.
4 It also supports local (per-processor) interrupts and software-generated
5 interrupts which can be used as IPIs. The GIC also includes a free-running
6 global timer, per-CPU count/compare timers, and a watchdog.
9 - compatible : Should be "mti,gic".
10 - interrupt-controller : Identifies the node as an interrupt controller
11 - #interrupt-cells : Specifies the number of cells needed to encode an
12 interrupt specifier. Should be 3.
13 - The first cell is the type of interrupt, local or shared.
14 See <include/dt-bindings/interrupt-controller/mips-gic.h>.
15 - The second cell is the GIC interrupt number.
16 - The third cell encodes the interrupt flags.
17 See <include/dt-bindings/interrupt-controller/irq.h> for a list of valid
21 - reg : Base address and length of the GIC registers. If not present,
22 the base address reported by the hardware GCR_GIC_BASE will be used.
23 - mti,reserved-cpu-vectors : Specifies the list of CPU interrupt vectors
24 to which the GIC may not route interrupts. Valid values are 2 - 7.
25 This property is ignored if the CPU is started in EIC mode.
26 - mti,reserved-ipi-vectors : Specifies the range of GIC interrupts that are
28 It accepts 2 values, the 1st is the starting interrupt and the 2nd is the size
29 of the reserved range.
30 If not specified, the driver will allocate the last 2 * number of VPEs in the
33 Required properties for timer sub-node:
34 - compatible : Should be "mti,gic-timer".
35 - interrupts : Interrupt for the GIC local timer.
37 Optional properties for timer sub-node:
38 - clocks : GIC timer operating clock.
39 - clock-frequency : Clock frequency at which the GIC timers operate.
41 Note that one of clocks or clock-frequency must be specified.
45 gic: interrupt-controller@1bdc0000 {
46 compatible = "mti,gic";
47 reg = <0x1bdc0000 0x20000>;
50 #interrupt-cells = <3>;
52 mti,reserved-cpu-vectors = <7>;
53 mti,reserved-ipi-vectors = <40 8>;
56 compatible = "mti,gic-timer";
57 interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
58 clock-frequency = <50000000>;
64 interrupt-parent = <&gic>;
65 interrupts = <GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>;