Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.yaml

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/interrupt-controller/ti,sci-intr.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Texas Instruments K3 Interrupt Router

maintainers:
  - Lokesh Vutla <lokeshvutla@ti.com>

allOf:
  - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#

description: |
  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).

properties:
  compatible:
    const: ti,sci-intr

  ti,intr-trigger-type:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [1, 4]
    description: |
      Should be one of the following.
        1 = If intr supports edge triggered interrupts.
        4 = If intr supports level triggered interrupts.

  interrupt-controller: true

  '#interrupt-cells':
    const: 1
    description: |
      The 1st cell should contain interrupt router input hw number.

  ti,interrupt-ranges:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    description: |
      Interrupt ranges that converts the INTR output hw irq numbers
      to parents's input interrupt numbers.
    items:
      items:
        - description: |
            "output_irq" specifies the base for intr output irq
        - description: |
            "parent's input irq" specifies the base for parent irq
        - description: |
            "limit" specifies the limit for translation

required:
  - compatible
  - ti,intr-trigger-type
  - interrupt-controller
  - '#interrupt-cells'
  - ti,sci
  - ti,sci-dev-id
  - ti,interrupt-ranges

examples:
  - |
    main_gpio_intr: interrupt-controller0 {
        compatible = "ti,sci-intr";
        ti,intr-trigger-type = <1>;
        interrupt-controller;
        interrupt-parent = <&gic500>;
        #interrupt-cells = <1>;
        ti,sci = <&dmsc>;
        ti,sci-dev-id = <131>;
        ti,interrupt-ranges = <0 360 32>;
    };