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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /Documentation/devicetree/bindings/arm/versatile-fpga-irq.txt
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
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-* ARM Versatile FPGA interrupt controller
-
-One or more FPGA IRQ controllers can be synthesized in an ARM reference board
-such as the Integrator or Versatile family. The output of these different
-controllers are OR:ed together and fed to the CPU tile's IRQ input. Each
-instance can handle up to 32 interrupts.
-
-Required properties:
-- compatible: "arm,versatile-fpga-irq"
-- interrupt-controller: Identifies the node as an interrupt controller
-- #interrupt-cells: The number of cells to define the interrupts. Must be 1
- as the FPGA IRQ controller has no configuration options for interrupt
- sources. The cell is a u32 and defines the interrupt number.
-- reg: The register bank for the FPGA interrupt controller.
-- clear-mask: a u32 number representing the mask written to clear all IRQs
- on the controller at boot for example.
-- valid-mask: a u32 number representing a bit mask determining which of
- the interrupts are valid. Unconnected/unused lines are set to 0, and
- the system till not make it possible for devices to request these
- interrupts.
-
-Example:
-
-pic: pic@14000000 {
- compatible = "arm,versatile-fpga-irq";
- #interrupt-cells = <1>;
- interrupt-controller;
- reg = <0x14000000 0x100>;
- clear-mask = <0xffffffff>;
- valid-mask = <0x003fffff>;
-};
-
-Optional properties:
-- interrupts: if the FPGA IRQ controller is cascaded, i.e. if its IRQ
- output is simply connected to the input of another IRQ controller,
- then the parent IRQ shall be specified in this property.