1 * Samsung Exynos Interrupt Combiner Controller
3 Samsung's Exynos4 architecture includes a interrupt combiner controller which
4 can combine interrupt sources as a group and provide a single interrupt request
5 for the group. The interrupt request from each group are connected to a parent
6 interrupt controller, such as GIC in case of Exynos4210.
8 The interrupt combiner controller consists of multiple combiners. Upto eight
9 interrupt sources can be connected to a combiner. The combiner outputs one
10 combined interrupt for its eight interrupt sources. The combined interrupt
11 is usually connected to a parent interrupt controller.
13 A single node in the device tree is used to describe the interrupt combiner
14 controller module (which includes multiple combiners). A combiner in the
15 interrupt controller module shares config/control registers with other
16 combiners. For example, a 32-bit interrupt enable/disable config register
17 can accommodate upto 4 interrupt combiners (with each combiner supporting
18 upto 8 interrupt sources).
21 - compatible: should be "samsung,exynos4210-combiner".
22 - interrupt-controller: Identifies the node as an interrupt controller.
23 - #interrupt-cells: should be <2>. The meaning of the cells are
24 * First Cell: Combiner Group Number.
25 * Second Cell: Interrupt number within the group.
26 - reg: Base address and size of interrupt combiner registers.
27 - interrupts: The list of interrupts generated by the combiners which are then
28 connected to a parent interrupt controller. The format of the interrupt
29 specifier depends in the interrupt parent controller.
32 - samsung,combiner-nr: The number of interrupt combiners supported. If this
33 property is not specified, the default number of combiners is assumed
35 - interrupt-parent: pHandle of the parent interrupt controller, if not
36 inherited from the parent node.
41 The following is a an example from the Exynos4210 SoC dtsi file.
43 combiner:interrupt-controller@10440000 {
44 compatible = "samsung,exynos4210-combiner";
46 #interrupt-cells = <2>;
47 reg = <0x10440000 0x1000>;
48 interrupts = <0 0 0>, <0 1 0>, <0 2 0>, <0 3 0>,
49 <0 4 0>, <0 5 0>, <0 6 0>, <0 7 0>,
50 <0 8 0>, <0 9 0>, <0 10 0>, <0 11 0>,
51 <0 12 0>, <0 13 0>, <0 14 0>, <0 15 0>;