linux-loongson/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pci/fsl,imx6q-pcie-common.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Freescale i.MX6 PCIe RC/EP controller

maintainers:
  - Lucas Stach <l.stach@pengutronix.de>
  - Richard Zhu <hongxing.zhu@nxp.com>

description:
  Generic Freescale i.MX PCIe Root Port and Endpoint controller
  properties.

properties:
  clocks:
    minItems: 3
    maxItems: 5

  clock-names:
    minItems: 3
    maxItems: 5

  num-lanes:
    const: 1

  fsl,imx7d-pcie-phy:
    $ref: /schemas/types.yaml#/definitions/phandle
    description: A phandle to an fsl,imx7d-pcie-phy node. Additional
      required properties for imx7d-pcie, imx7d-pcie-ep, imx8mq-pcie,
      and imx8mq-pcie-ep.

  power-domains:
    minItems: 1
    items:
      - description: The phandle pointing to the DISPLAY domain for
          imx6sx-pcie, imx6sx-pcie-ep, to PCIE_PHY power domain for
          imx7d-pcie, imx7d-pcie-ep, imx8mq-pcie and imx8mq-pcie-ep.
      - description: The phandle pointing to the PCIE_PHY power domains
          for imx6sx-pcie and imx6sx-pcie-ep.

  power-domain-names:
    minItems: 1
    items:
      - const: pcie
      - const: pcie_phy

  resets:
    minItems: 2
    maxItems: 3
    description: Phandles to PCIe-related reset lines exposed by SRC
      IP block. Additional required by imx7d-pcie, imx7d-pcie-ep,
      imx8mq-pcie, and imx8mq-pcie-ep.

  reset-names:
    minItems: 2
    maxItems: 3

  fsl,tx-deemph-gen1:
    description: Gen1 De-emphasis value (optional required).
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 0

  fsl,tx-deemph-gen2-3p5db:
    description: Gen2 (3.5db) De-emphasis value (optional required).
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 0

  fsl,tx-deemph-gen2-6db:
    description: Gen2 (6db) De-emphasis value (optional required).
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 20

  fsl,tx-swing-full:
    description: Gen2 TX SWING FULL value (optional required).
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 127

  fsl,tx-swing-low:
    description: TX launch amplitude swing_low value (optional required).
    $ref: /schemas/types.yaml#/definitions/uint32
    default: 127

  fsl,max-link-speed:
    description: Specify PCI Gen for link capability (optional required).
      Note that the IMX6 LVDS clock outputs do not meet gen2 jitter
      requirements and thus for gen2 capability a gen2 compliant clock
      generator should be used and configured.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [1, 2, 3, 4]
    default: 1

  phys:
    maxItems: 1

  phy-names:
    const: pcie-phy

  vpcie-supply:
    description: Should specify the regulator in charge of PCIe port power.
      The regulator will be enabled when initializing the PCIe host and
      disabled either as part of the init process or when shutting down
      the host (optional required).

  vph-supply:
    description: Should specify the regulator in charge of VPH one of
      the three PCIe PHY powers. This regulator can be supplied by both
      1.8v and 3.3v voltage supplies (optional required).

required:
  - clocks
  - clock-names
  - num-lanes

allOf:
  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx6sx-pcie
              - fsl,imx6sx-pcie-ep
    then:
      properties:
        clock-names:
          items:
            - {}
            - {}
            - const: pcie_phy
            - const: pcie_inbound_axi
        power-domains:
          minItems: 2
        power-domain-names:
          minItems: 2

  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx8mq-pcie
              - fsl,imx8mq-pcie-ep
    then:
      properties:
        clock-names:
          items:
            - {}
            - {}
            - const: pcie_phy
            - const: pcie_aux

  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx6q-pcie
              - fsl,imx6qp-pcie
              - fsl,imx7d-pcie
              - fsl,imx6q-pcie-ep
              - fsl,imx6qp-pcie-ep
              - fsl,imx7d-pcie-ep
    then:
      properties:
        clock-names:
          maxItems: 3
          contains:
            const: pcie_phy

  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx8mm-pcie
              - fsl,imx8mp-pcie
              - fsl,imx8mm-pcie-ep
              - fsl,imx8mp-pcie-ep
    then:
      properties:
        clock-names:
          maxItems: 3
          contains:
            const: pcie_aux
  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx6q-pcie
              - fsl,imx6qp-pcie
              - fsl,imx6q-pcie-ep
              - fsl,imx6qp-pcie-ep
    then:
      properties:
        power-domains: false
        power-domain-names: false

  - if:
      not:
        properties:
          compatible:
            contains:
              enum:
                - fsl,imx6sx-pcie
                - fsl,imx6q-pcie
                - fsl,imx6qp-pcie
                - fsl,imx95-pcie
                - fsl,imx6sx-pcie-ep
                - fsl,imx6q-pcie-ep
                - fsl,imx6qp-pcie-ep
    then:
      properties:
        power-domains:
          maxItems: 1
        power-domain-names: false

  - if:
      properties:
        compatible:
          contains:
            enum:
              - fsl,imx6q-pcie
              - fsl,imx6sx-pcie
              - fsl,imx6qp-pcie
              - fsl,imx7d-pcie
              - fsl,imx8mq-pcie
              - fsl,imx6q-pcie-ep
              - fsl,imx6sx-pcie-ep
              - fsl,imx6qp-pcie-ep
              - fsl,imx7d-pcie-ep
              - fsl,imx8mq-pcie-ep
    then:
      properties:
        resets:
          minItems: 3
        reset-names:
          items:
            - const: pciephy
            - const: apps
            - const: turnoff
    else:
      properties:
        resets:
          maxItems: 2
        reset-names:
          items:
            - const: apps
            - const: turnoff

additionalProperties: true

...