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-Texas Instruments K3 Interrupt Router
-=====================================
-
-The Interrupt Router (INTR) module provides a mechanism to mux M
-interrupt inputs to N interrupt outputs, where all M inputs are selectable
-to be driven per N output. An Interrupt Router can either handle edge triggered
-or level triggered interrupts and that is fixed in hardware.
-
- Interrupt Router
- +----------------------+
- | Inputs Outputs |
- +-------+ | +------+ +-----+ |
- | GPIO |----------->| | irq0 | | 0 | | Host IRQ
- +-------+ | +------+ +-----+ | controller
- | . . | +-------+
- +-------+ | . . |----->| IRQ |
- | INTA |----------->| . . | +-------+
- +-------+ | . +-----+ |
- | +------+ | N | |
- | | irqM | +-----+ |
- | +------+ |
- | |
- +----------------------+
-
-There is one register per output (MUXCNTL_N) that controls the selection.
-Configuration of these MUXCNTL_N registers is done by a system controller
-(like the Device Memory and Security Controller on K3 AM654 SoC). System
-controller will keep track of the used and unused registers within the Router.
-Driver should request the system controller to get the range of GIC IRQs
-assigned to the requesting hosts. It is the drivers responsibility to keep
-track of Host IRQs.
-
-Communication between the host processor running an OS and the system
-controller happens through a protocol called TI System Control Interface
-(TISCI protocol). For more details refer:
-Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
-
-TISCI Interrupt Router Node:
-----------------------------
-Required Properties:
-- compatible: Must be "ti,sci-intr".
-- ti,intr-trigger-type: Should be one of the following:
- 1: If intr supports edge triggered interrupts.
- 4: If intr supports level triggered interrupts.
-- interrupt-controller: Identifies the node as an interrupt controller
-- #interrupt-cells: Specifies the number of cells needed to encode an
- interrupt source. The value should be 2.
- First cell should contain the TISCI device ID of source
- Second cell should contain the interrupt source offset
- within the device.
-- ti,sci: Phandle to TI-SCI compatible System controller node.
-- ti,sci-dst-id: TISCI device ID of the destination IRQ controller.
-- ti,sci-rm-range-girq: Array of TISCI subtype ids representing the host irqs
- assigned to this interrupt router. Each subtype id
- corresponds to a range of host irqs.
-
-For more details on TISCI IRQ resource management refer:
-https://downloads.ti.com/tisci/esd/latest/2_tisci_msgs/rm/rm_irq.html
-
-Example:
---------
-The following example demonstrates both interrupt router node and the consumer
-node(main gpio) on the AM654 SoC:
-
-main_intr: interrupt-controller0 {
- compatible = "ti,sci-intr";
- ti,intr-trigger-type = <1>;
- interrupt-controller;
- interrupt-parent = <&gic500>;
- #interrupt-cells = <2>;
- ti,sci = <&dmsc>;
- ti,sci-dst-id = <56>;
- ti,sci-rm-range-girq = <0x1>;
-};
-
-main_gpio0: gpio@600000 {
- ...
- interrupt-parent = <&main_intr>;
- interrupts = <57 256>, <57 257>, <57 258>,
- <57 259>, <57 260>, <57 261>;
- ...
-};