linux-zen-desktop/Documentation/devicetree/bindings/interrupt-controller/apple,aic2.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/interrupt-controller/apple,aic2.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Apple Interrupt Controller 2

maintainers:
  - Hector Martin <marcan@marcan.st>

description: |
  The Apple Interrupt Controller 2 is a simple interrupt controller present on
  Apple ARM SoC platforms starting with t600x (M1 Pro and Max).

  It provides the following features:

  - Level-triggered hardware IRQs wired to SoC blocks
    - Single mask bit per IRQ
    - Automatic masking on event delivery (auto-ack)
    - Software triggering (ORed with hw line)
  - Automatic prioritization (single event/ack register per CPU, lower IRQs =
    higher priority)
  - Automatic masking on ack
  - Support for multiple dies

  This device also represents the FIQ interrupt sources on platforms using AIC,
  which do not go through a discrete interrupt controller. It also handles
  FIQ-based Fast IPIs.

properties:
  compatible:
    items:
      - enum:
          - apple,t8112-aic
          - apple,t6000-aic
      - const: apple,aic2

  interrupt-controller: true

  '#interrupt-cells':
    minimum: 3
    maximum: 4
    description: |
      The 1st cell contains the interrupt type:
        - 0: Hardware IRQ
        - 1: FIQ

      The 2nd cell contains the die ID (only present on apple,t6000-aic).

      The next cell contains the interrupt number.
        - HW IRQs: interrupt number
        - FIQs:
          - 0: physical HV timer
          - 1: virtual HV timer
          - 2: physical guest timer
          - 3: virtual guest timer

      The last cell contains the interrupt flags. This is normally
      IRQ_TYPE_LEVEL_HIGH (4).

  reg:
    items:
      - description: Address and size of the main AIC2 registers.
      - description: Address and size of the AIC2 Event register.

  reg-names:
    items:
      - const: core
      - const: event

  power-domains:
    maxItems: 1

  affinities:
    type: object
    additionalProperties: false
    description:
      FIQ affinity can be expressed as a single "affinities" node,
      containing a set of sub-nodes, one per FIQ with a non-default
      affinity.
    patternProperties:
      "^.+-affinity$":
        type: object
        additionalProperties: false
        properties:
          apple,fiq-index:
            description:
              The interrupt number specified as a FIQ, and for which
              the affinity is not the default.
            $ref: /schemas/types.yaml#/definitions/uint32
            maximum: 5

          cpus:
            $ref: /schemas/types.yaml#/definitions/phandle-array
            description:
              Should be a list of phandles to CPU nodes (as described in
              Documentation/devicetree/bindings/arm/cpus.yaml).

        required:
          - apple,fiq-index
          - cpus

required:
  - compatible
  - '#interrupt-cells'
  - interrupt-controller
  - reg
  - reg-names

additionalProperties: false

allOf:
  - $ref: /schemas/interrupt-controller.yaml#
  - if:
      properties:
        compatible:
          contains:
            const: apple,t8112-aic
    then:
      properties:
        '#interrupt-cells':
          const: 3
    else:
      properties:
        '#interrupt-cells':
          const: 4

examples:
  - |
    soc {
        #address-cells = <2>;
        #size-cells = <2>;

        aic: interrupt-controller@28e100000 {
            compatible = "apple,t6000-aic", "apple,aic2";
            #interrupt-cells = <4>;
            interrupt-controller;
            reg = <0x2 0x8e100000 0x0 0xc000>,
                  <0x2 0x8e10c000 0x0 0x4>;
            reg-names = "core", "event";
        };
    };