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