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1Broadcom BCM7038-style Level 1 interrupt controller
2
3This block is a first level interrupt controller that is typically connected
4directly to one of the HW INT lines on each CPU. Every BCM7xxx set-top chip
5since BCM7038 has contained this hardware.
6
7Key elements of the hardware design include:
8
9- 64, 96, 128, or 160 incoming level IRQ lines
10
11- Most onchip peripherals are wired directly to an L1 input
12
13- A separate instance of the register set for each CPU, allowing individual
14 peripheral IRQs to be routed to any CPU
15
16- Atomic mask/unmask operations
17
18- No polarity/level/edge settings
19
20- No FIFO or priority encoder logic; software is expected to read all
21 2-5 status words to determine which IRQs are pending
22
23Required properties:
24
25- compatible: should be "brcm,bcm7038-l1-intc"
26- reg: specifies the base physical address and size of the registers;
27 the number of supported IRQs is inferred from the size argument
28- interrupt-controller: identifies the node as an interrupt controller
29- #interrupt-cells: specifies the number of cells needed to encode an interrupt
30 source, should be 1.
31- interrupts: specifies the interrupt line(s) in the interrupt-parent controller
32 node; valid values depend on the type of parent interrupt controller
33
34If multiple reg ranges and interrupt-parent entries are present on an SMP
35system, the driver will allow IRQ SMP affinity to be set up through the
36/proc/irq/ interface. In the simplest possible configuration, only one
37reg range and one interrupt-parent is needed.
38
39Example:
40
41periph_intc: periph_intc@1041a400 {
42 compatible = "brcm,bcm7038-l1-intc";
43 reg = <0x1041a400 0x30 0x1041a600 0x30>;
44
45 interrupt-controller;
46 #interrupt-cells = <1>;
47
48 interrupt-parent = <&cpu_intc>;
49 interrupts = <2>, <3>;
50};