linux/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 <marc.zyngier@arm.com>

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.
    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 functionnality 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
    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
        properties:
          affinity:
            $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:
          - affinity

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

required:
  - compatible
  - interrupts
  - 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>;

      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>;
    };

...