linuxdebug/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pci/mediatek-pcie-gen3.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Gen3 PCIe controller on MediaTek SoCs

maintainers:
  - Jianjun Wang <jianjun.wang@mediatek.com>

description: |+
  PCIe Gen3 MAC controller for MediaTek SoCs, it supports Gen3 speed
  and compatible with Gen2, Gen1 speed.

  This PCIe controller supports up to 256 MSI vectors, the MSI hardware
  block diagram is as follows:

                    +-----+
                    | GIC |
                    +-----+
                       ^
                       |
                   port->irq
                       |
               +-+-+-+-+-+-+-+-+
               |0|1|2|3|4|5|6|7| (PCIe intc)
               +-+-+-+-+-+-+-+-+
                ^ ^           ^
                | |    ...    |
        +-------+ +------+    +-----------+
        |                |                |
  +-+-+---+--+--+  +-+-+---+--+--+  +-+-+---+--+--+
  |0|1|...|30|31|  |0|1|...|30|31|  |0|1|...|30|31| (MSI sets)
  +-+-+---+--+--+  +-+-+---+--+--+  +-+-+---+--+--+
   ^ ^      ^  ^    ^ ^      ^  ^    ^ ^      ^  ^
   | |      |  |    | |      |  |    | |      |  |  (MSI vectors)
   | |      |  |    | |      |  |    | |      |  |

    (MSI SET0)       (MSI SET1)  ...   (MSI SET7)

  With 256 MSI vectors supported, the MSI vectors are composed of 8 sets,
  each set has its own address for MSI message, and supports 32 MSI vectors
  to generate interrupt.

allOf:
  - $ref: /schemas/pci/pci-bus.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - mediatek,mt8188-pcie
              - mediatek,mt8195-pcie
          - const: mediatek,mt8192-pcie
      - const: mediatek,mt8192-pcie

  reg:
    maxItems: 1

  reg-names:
    items:
      - const: pcie-mac

  interrupts:
    maxItems: 1

  ranges:
    minItems: 1
    maxItems: 8

  resets:
    minItems: 1
    maxItems: 2

  reset-names:
    minItems: 1
    items:
      - const: phy
      - const: mac

  clocks:
    maxItems: 6

  clock-names:
    items:
      - const: pl_250m
      - const: tl_26m
      - const: tl_96m
      - const: tl_32k
      - const: peri_26m
      - enum:
          - top_133m        # for MT8192
          - peri_mem        # for MT8188/MT8195

  assigned-clocks:
    maxItems: 1

  assigned-clock-parents:
    maxItems: 1

  phys:
    maxItems: 1

  phy-names:
    items:
      - const: pcie-phy

  '#interrupt-cells':
    const: 1

  interrupt-controller:
    description: Interrupt controller node for handling legacy PCI interrupts.
    type: object
    properties:
      '#address-cells':
        const: 0
      '#interrupt-cells':
        const: 1
      interrupt-controller: true

    required:
      - '#address-cells'
      - '#interrupt-cells'
      - interrupt-controller

    additionalProperties: false

required:
  - compatible
  - reg
  - reg-names
  - interrupts
  - ranges
  - clocks
  - clock-names
  - '#interrupt-cells'
  - interrupt-controller

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    bus {
        #address-cells = <2>;
        #size-cells = <2>;

        pcie: pcie@11230000 {
            compatible = "mediatek,mt8192-pcie";
            device_type = "pci";
            #address-cells = <3>;
            #size-cells = <2>;
            reg = <0x00 0x11230000 0x00 0x4000>;
            reg-names = "pcie-mac";
            interrupts = <GIC_SPI 251 IRQ_TYPE_LEVEL_HIGH 0>;
            bus-range = <0x00 0xff>;
            ranges = <0x82000000 0x00 0x12000000 0x00
                      0x12000000 0x00 0x1000000>;
            clocks = <&infracfg 44>,
                     <&infracfg 40>,
                     <&infracfg 43>,
                     <&infracfg 97>,
                     <&infracfg 99>,
                     <&infracfg 111>;
            clock-names = "pl_250m", "tl_26m", "tl_96m",
                          "tl_32k", "peri_26m", "top_133m";
            assigned-clocks = <&topckgen 50>;
            assigned-clock-parents = <&topckgen 91>;

            phys = <&pciephy>;
            phy-names = "pcie-phy";

            resets = <&infracfg_rst 2>,
                     <&infracfg_rst 3>;
            reset-names = "phy", "mac";

            #interrupt-cells = <1>;
            interrupt-map-mask = <0 0 0 0x7>;
            interrupt-map = <0 0 0 1 &pcie_intc 0>,
                            <0 0 0 2 &pcie_intc 1>,
                            <0 0 0 3 &pcie_intc 2>,
                            <0 0 0 4 &pcie_intc 3>;
            pcie_intc: interrupt-controller {
                      #address-cells = <0>;
                      #interrupt-cells = <1>;
                      interrupt-controller;
            };
        };
    };