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

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

title: Freescale i.MX6 PCIe host controller

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

description: |+
  This PCIe host controller is based on the Synopsys DesignWare PCIe IP
  and thus inherits all the common properties defined in snps,dw-pcie.yaml.

allOf:
  - $ref: /schemas/pci/snps,dw-pcie.yaml#

properties:
  compatible:
    enum:
      - fsl,imx6q-pcie
      - fsl,imx6sx-pcie
      - fsl,imx6qp-pcie
      - fsl,imx7d-pcie
      - fsl,imx8mq-pcie

  reg:
    items:
      - description: Data Bus Interface (DBI) registers.
      - description: PCIe configuration space region.

  reg-names:
    items:
      - const: dbi
      - const: config

  interrupts:
    items:
      - description: builtin MSI controller.

  interrupt-names:
    items:
      - const: msi

  clocks:
    minItems: 3
    items:
      - description: PCIe bridge clock.
      - description: PCIe bus clock.
      - description: PCIe PHY clock.
      - description: Additional required clock entry for imx6sx-pcie,
          imx8mq-pcie.

  clock-names:
    minItems: 3
    items:
      - const: pcie
      - const: pcie_bus
      - const: pcie_phy
      - const: pcie_inbound_axi for imx6sx-pcie, pcie_aux for imx8mq-pcie

  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 and imx8mq-pcie.

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

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

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

  reset-names:
    items:
      - const: pciephy
      - const: apps
      - const: turnoff

  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

  reset-gpio:
    description: Should specify the GPIO for controlling the PCI bus device
      reset signal. It's not polarity aware and defaults to active-low reset
      sequence (L=reset state, H=operation state) (optional required).

  reset-gpio-active-high:
    description: If present then the reset sequence using the GPIO
      specified in the "reset-gpio" property is reversed (H=reset state,
      L=operation state) (optional required).

  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:
  - compatible
  - reg
  - reg-names
  - "#address-cells"
  - "#size-cells"
  - device_type
  - bus-range
  - ranges
  - num-lanes
  - interrupts
  - interrupt-names
  - "#interrupt-cells"
  - interrupt-map-mask
  - interrupt-map
  - clocks
  - clock-names

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/clock/imx6qdl-clock.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    pcie: pcie@1ffc000 {
        compatible = "fsl,imx6q-pcie";
        reg = <0x01ffc000 0x04000>,
              <0x01f00000 0x80000>;
        reg-names = "dbi", "config";
        #address-cells = <3>;
        #size-cells = <2>;
        device_type = "pci";
        bus-range = <0x00 0xff>;
        ranges = <0x81000000 0 0          0x01f80000 0 0x00010000>,
                 <0x82000000 0 0x01000000 0x01000000 0 0x00f00000>;
        num-lanes = <1>;
        interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
        interrupt-names = "msi";
        #interrupt-cells = <1>;
        interrupt-map-mask = <0 0 0 0x7>;
        interrupt-map = <0 0 0 1 &gpc GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>,
                        <0 0 0 2 &gpc GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>,
                        <0 0 0 3 &gpc GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>,
                        <0 0 0 4 &gpc GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clks IMX6QDL_CLK_PCIE_AXI>,
                <&clks IMX6QDL_CLK_LVDS1_GATE>,
                <&clks IMX6QDL_CLK_PCIE_REF_125M>;
        clock-names = "pcie", "pcie_bus", "pcie_phy";
    };
...