linux/Documentation/devicetree/bindings/arm/samsung/interrupt-combiner.txt
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   1* Samsung Exynos Interrupt Combiner Controller
   2
   3Samsung's Exynos4 architecture includes a interrupt combiner controller which
   4can combine interrupt sources as a group and provide a single interrupt request
   5for the group. The interrupt request from each group are connected to a parent
   6interrupt controller, such as GIC in case of Exynos4210.
   7
   8The interrupt combiner controller consists of multiple combiners. Upto eight
   9interrupt sources can be connected to a combiner. The combiner outputs one
  10combined interrupt for its eight interrupt sources. The combined interrupt
  11is usually connected to a parent interrupt controller.
  12
  13A single node in the device tree is used to describe the interrupt combiner
  14controller module (which includes multiple combiners). A combiner in the
  15interrupt controller module shares config/control registers with other
  16combiners. For example, a 32-bit interrupt enable/disable config register
  17can accommodate upto 4 interrupt combiners (with each combiner supporting
  18upto 8 interrupt sources).
  19
  20Required properties:
  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.
  30
  31Optional properties:
  32- samsung,combiner-nr: The number of interrupt combiners supported. If this
  33  property is not specified, the default number of combiners is assumed
  34  to be 16.
  35- interrupt-parent: pHandle of the parent interrupt controller, if not
  36  inherited from the parent node.
  37
  38
  39Example:
  40
  41        The following is a an example from the Exynos4210 SoC dtsi file.
  42
  43        combiner:interrupt-controller@10440000 {
  44                compatible = "samsung,exynos4210-combiner";
  45                interrupt-controller;
  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>;
  52        };
  53