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