linux-net/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/interrupt-controller/arm,gic-v3.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ARM Generic Interrupt Controller, version 3

maintainers:
  - Marc Zyngier <maz@kernel.org>

description: |
  AArch64 SMP cores are often associated with a GICv3, providing Private
  Peripheral Interrupts (PPI), Shared Peripheral Interrupts (SPI),
  Software Generated Interrupts (SGI), and Locality-specific Peripheral
  Interrupts (LPI).

allOf:
  - $ref: /schemas/interrupt-controller.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - qcom,msm8996-gic-v3
          - const: arm,gic-v3
      - const: arm,gic-v3

  interrupt-controller: true

  "#address-cells":
    enum: [ 0, 1, 2 ]
  "#size-cells":
    enum: [ 1, 2 ]

  ranges: true

  "#interrupt-cells":
    description: |
      Specifies the number of cells needed to encode an interrupt source.
      Must be a single cell with a value of at least 3.
      If the system requires describing PPI affinity, then the value must
      be at least 4.

      The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
      interrupts, 2 for interrupts in the Extended SPI range, 3 for the
      Extended PPI range. Other values are reserved for future use.

      The 2nd cell contains the interrupt number for the interrupt type.
      SPI interrupts are in the range [0-987]. PPI interrupts are in the
      range [0-15]. Extented SPI interrupts are in the range [0-1023].
      Extended PPI interrupts are in the range [0-127].

      The 3rd cell is the flags, encoded as follows:
      bits[3:0] trigger type and level flags.
        1 = edge triggered
        4 = level triggered

      The 4th cell is a phandle to a node describing a set of CPUs this
      interrupt is affine to. The interrupt must be a PPI, and the node
      pointed must be a subnode of the "ppi-partitions" subnode. For
      interrupt types other than PPI or PPIs that are not partitionned,
      this cell must be zero. See the "ppi-partitions" node description
      below.

      Cells 5 and beyond are reserved for future use and must have a value
      of 0 if present.
    enum: [ 3, 4 ]

  reg:
    description: |
      Specifies base physical address(s) and size of the GIC
      registers, in the following order:
      - GIC Distributor interface (GICD)
      - GIC Redistributors (GICR), one range per redistributor region
      - GIC CPU interface (GICC)
      - GIC Hypervisor interface (GICH)
      - GIC Virtual CPU interface (GICV)

      GICC, GICH and GICV are optional, but must be described if the CPUs
      support them. Examples of such CPUs are ARM's implementations of the
      ARMv8.0 architecture such as Cortex-A32, A34, A35, A53, A57, A72 and
      A73 (this list is not exhaustive).

    minItems: 2
    maxItems: 4096   # Should be enough?

  interrupts:
    description:
      Interrupt source of the VGIC maintenance interrupt.
    maxItems: 1

  redistributor-stride:
    description:
      If using padding pages, specifies the stride of consecutive
      redistributors. Must be a multiple of 64kB.
    $ref: /schemas/types.yaml#/definitions/uint64
    multipleOf: 0x10000
    exclusiveMinimum: 0

  "#redistributor-regions":
    description:
      The number of independent contiguous regions occupied by the
      redistributors. Required if more than one such region is present.
    $ref: /schemas/types.yaml#/definitions/uint32
    maximum: 4096

  msi-controller:
    description:
      Only present if the Message Based Interrupt functionality is
      being exposed by the HW, and the mbi-ranges property present.

  mbi-ranges:
    description:
      A list of pairs <intid span>, where "intid" is the first SPI of a range
      that can be used an MBI, and "span" the size of that range. Multiple
      ranges can be provided.
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    items:
      minItems: 2
      maxItems: 2

  mbi-alias:
    description:
      Address property. Base address of an alias of the GICD region containing
      only the {SET,CLR}SPI registers to be used if isolation is required,
      and if supported by the HW.
    $ref: /schemas/types.yaml#/definitions/uint32-array
    items:
      minItems: 1
      maxItems: 2

  ppi-partitions:
    type: object
    additionalProperties: false
    description:
      PPI affinity can be expressed as a single "ppi-partitions" node,
      containing a set of sub-nodes.
    patternProperties:
      "^interrupt-partition-[0-9]+$":
        type: object
        additionalProperties: false
        properties:
          affinity:
            $ref: /schemas/types.yaml#/definitions/phandle-array
            items:
              maxItems: 1
            description:
              Should be a list of phandles to CPU nodes (as described in
              Documentation/devicetree/bindings/arm/cpus.yaml).

        required:
          - affinity

  clocks:
    maxItems: 1

  clock-names:
    items:
      - const: aclk

  power-domains:
    maxItems: 1

  resets:
    maxItems: 1

  mediatek,broken-save-restore-fw:
    type: boolean
    description:
      Asserts that the firmware on this device has issues saving and restoring
      GICR registers when the GIC redistributors are powered off.

dependencies:
  mbi-ranges: [ msi-controller ]
  msi-controller: [ mbi-ranges ]

required:
  - compatible
  - reg

patternProperties:
  "^gic-its@": false
  "^interrupt-controller@[0-9a-f]+$": false
  # msi-controller is preferred, but allow other names
  "^(msi-controller|gic-its|interrupt-controller)@[0-9a-f]+$":
    type: object
    description:
      GICv3 has one or more Interrupt Translation Services (ITS) that are
      used to route Message Signalled Interrupts (MSI) to the CPUs.
    properties:
      compatible:
        const: arm,gic-v3-its

      msi-controller: true

      "#msi-cells":
        description:
          The single msi-cell is the DeviceID of the device which will generate
          the MSI.
        const: 1

      reg:
        description:
          Specifies the base physical address and size of the ITS registers.
        maxItems: 1

      socionext,synquacer-pre-its:
        description:
          (u32, u32) tuple describing the untranslated
          address and size of the pre-ITS window.
        $ref: /schemas/types.yaml#/definitions/uint32-array
        items:
          minItems: 2
          maxItems: 2

    required:
      - compatible
      - msi-controller
      - "#msi-cells"
      - reg

    additionalProperties: false

additionalProperties: false

examples:
  - |
    gic: interrupt-controller@2cf00000 {
      compatible = "arm,gic-v3";
      #interrupt-cells = <3>;
      #address-cells = <1>;
      #size-cells = <1>;
      ranges;
      interrupt-controller;
      reg = <0x2f000000 0x10000>,  // GICD
            <0x2f100000 0x200000>,  // GICR
            <0x2c000000 0x2000>,  // GICC
            <0x2c010000 0x2000>,  // GICH
            <0x2c020000 0x2000>;  // GICV
      interrupts = <1 9 4>;

      msi-controller;
      mbi-ranges = <256 128>;

      msi-controller@2c200000 {
        compatible = "arm,gic-v3-its";
        msi-controller;
        #msi-cells = <1>;
        reg = <0x2c200000 0x20000>;
      };
    };

  - |
    interrupt-controller@2c010000 {
      compatible = "arm,gic-v3";
      #interrupt-cells = <4>;
      #address-cells = <1>;
      #size-cells = <1>;
      ranges;
      interrupt-controller;
      redistributor-stride = <0x0 0x40000>;  // 256kB stride
      #redistributor-regions = <2>;
      reg = <0x2c010000 0x10000>,  // GICD
            <0x2d000000 0x800000>,  // GICR 1: CPUs 0-31
            <0x2e000000 0x800000>,  // GICR 2: CPUs 32-63
            <0x2c040000 0x2000>,  // GICC
            <0x2c060000 0x2000>,  // GICH
            <0x2c080000 0x2000>;  // GICV
      interrupts = <1 9 4 0>;

      msi-controller@2c200000 {
        compatible = "arm,gic-v3-its";
        msi-controller;
        #msi-cells = <1>;
        reg = <0x2c200000 0x20000>;
      };

      msi-controller@2c400000 {
        compatible = "arm,gic-v3-its";
        msi-controller;
        #msi-cells = <1>;
        reg = <0x2c400000 0x20000>;
      };

      ppi-partitions {
        part0: interrupt-partition-0 {
          affinity = <&cpu0>, <&cpu2>;
        };

        part1: interrupt-partition-1 {
          affinity = <&cpu1>, <&cpu3>;
        };
      };
    };


    device@0 {
      reg = <0 4>;
      interrupts = <1 1 4 &part0>;
    };

...