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