linux-stable/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/pci/snps,dw-pcie.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Synopsys DesignWare PCIe interface

maintainers:
  - Jingoo Han <jingoohan1@gmail.com>
  - Gustavo Pimentel <gustavo.pimentel@synopsys.com>

description: |
  Synopsys DesignWare PCIe host controller

# Please create a separate DT-schema for your DWC PCIe Root Port controller
# and make sure it's assigned with the vendor-specific compatible string.
select:
  properties:
    compatible:
      const: snps,dw-pcie
  required:
    - compatible

allOf:
  - $ref: /schemas/pci/pci-bus.yaml#
  - $ref: /schemas/pci/snps,dw-pcie-common.yaml#
  - if:
      not:
        required:
          - msi-map
    then:
      properties:
        interrupt-names:
          contains:
            const: msi

properties:
  reg:
    description:
      At least DBI reg-space and peripheral devices CFG-space outbound window
      are required for the normal controller work. iATU memory IO region is
      also required if the space is unrolled (IP-core version >= 4.80a).
    minItems: 2
    maxItems: 7

  reg-names:
    minItems: 2
    maxItems: 7
    items:
      oneOf:
        - description:
            Basic DWC PCIe controller configuration-space accessible over
            the DBI interface. This memory space is either activated with
            CDM/ELBI = 0 and CS2 = 0 or is a contiguous memory region
            with all spaces. Note iATU/eDMA CSRs are indirectly accessible
            via the PL viewports on the DWC PCIe controllers older than
            v4.80a.
          const: dbi
        - description:
            Shadow DWC PCIe config-space registers. This space is selected
            by setting CDM/ELBI = 0 and CS2 = 1. This is an intermix of
            the PCI-SIG PCIe CFG-space with the shadow registers for some
            PCI Header space, PCI Standard and Extended Structures. It's
            mainly relevant for the end-point controller configuration,
            but still there are some shadow registers available for the
            Root Port mode too.
          const: dbi2
        - description:
            External Local Bus registers. It's an application-dependent
            registers normally defined by the platform engineers. The space
            can be selected by setting CDM/ELBI = 1 and CS2 = 0 wires or can
            be accessed over some platform-specific means (for instance
            as a part of a system controller).
          enum: [ elbi, app ]
        - description:
            iATU/eDMA registers common for all device functions. It's an
            unrolled memory space with the internal Address Translation
            Unit and Enhanced DMA, which is selected by setting CDM/ELBI = 1
            and CS2 = 1. For IP-core releases prior v4.80a, these registers
            have been programmed via an indirect addressing scheme using a
            set of viewport CSRs mapped into the PL space. Note iATU is
            normally mapped to the 0x0 address of this region, while eDMA
            is available at 0x80000 base address.
          const: atu
        - description:
            Platform-specific eDMA registers. Some platforms may have eDMA
            CSRs mapped in a non-standard base address. The registers offset
            can be changed or the MS/LS-bits of the address can be attached
            in an additional RTL block before the MEM-IO transactions reach
            the DW PCIe slave interface.
          const: dma
        - description:
            PHY/PCS configuration registers. Some platforms can have the
            PCS and PHY CSRs accessible over a dedicated memory mapped
            region, but mainly these registers are indirectly accessible
            either by means of the embedded PHY viewport schema or by some
            platform-specific method.
          const: phy
        - description:
            Outbound iATU-capable memory-region which will be used to access
            the peripheral PCIe devices configuration space.
          const: config
        - description:
            Vendor-specific CSR names. Consider using the generic names above
            for new bindings.
          oneOf:
            - description: See native 'elbi/app' CSR region for details.
              enum: [ apb, mgmt, link, ulreg, appl ]
            - description: See native 'atu' CSR region for details.
              enum: [ atu_dma ]
            - description: Syscon-related CSR regions.
              enum: [ smu, mpu ]
            - description: Tegra234 aperture
              enum: [ ecam ]
    allOf:
      - contains:
          const: dbi
      - contains:
          const: config

  interrupts:
    description:
      DWC PCIe Root Port/Complex specific IRQ signals. At least MSI interrupt
      signal is supposed to be specified for the host controller.
    minItems: 1
    maxItems: 26

  interrupt-names:
    minItems: 1
    maxItems: 26
    items:
      oneOf:
        - description:
            Controller request to read or write virtual product data
            from/to the VPD capability registers.
          const: vpd
        - description:
            Link Equalization Request flag is set in the Link Status 2
            register (applicable if the corresponding IRQ is enabled in
            the Link Control 3 register).
          const: l_eq
        - description:
            Indicates that the eDMA Tx/Rx transfer is complete or that an
            error has occurred on the corresponding channel. eDMA can have
            eight Tx (Write) and Rx (Read) eDMA channels thus supporting up
            to 16 IRQ signals all together. Write eDMA channels shall go
            first in the ordered row as per default edma_int[*] bus setup.
          pattern: '^dma([0-9]|1[0-5])?$'
        - description:
            PCIe protocol correctable error or a Data Path protection
            correctable error is detected by the automotive/safety
            feature.
          const: sft_ce
        - description:
            Indicates that the internal safety mechanism has detected an
            uncorrectable error.
          const: sft_ue
        - description:
            Application-specific IRQ raised depending on the vendor-specific
            events basis.
          const: app
        - description:
            DSP AXI MSI Interrupt detected. It gets de-asserted when there is
            no more MSI interrupt pending. The interrupt is relevant to the
            iMSI-RX - Integrated MSI Receiver (AXI bridge).
          const: msi
        - description:
            Legacy A/B/C/D interrupt signal. Basically it's triggered by
            receiving a Assert_INT{A,B,C,D}/Desassert_INT{A,B,C,D} message
            from the downstream device.
          pattern: "^int(a|b|c|d)$"
        - description:
            Error condition detected and a flag is set in the Root Error Status
            register of the AER capability. It's asserted when the RC
            internally generated an error or an error message is received by
            the RC.
          const: aer
        - description:
            PME message is received by the port. That means having the PME
            status bit set in the Root Status register (the event is
            supposed to be unmasked in the Root Control register).
          const: pme
        - description:
            Hot-plug event is detected. That is a bit has been set in the
            Slot Status register and the corresponding event is enabled in
            the Slot Control register.
          const: hp
        - description:
            Link Autonomous Bandwidth Status flag has been set in the Link
            Status register (the event is supposed to be unmasked in the
            Link Control register).
          const: bw_au
        - description:
            Bandwidth Management Status flag has been set in the Link
            Status register (the event is supposed to be unmasked in the
            Link Control register).
          const: bw_mg
        - description:
            Combined Legacy A/B/C/D interrupt signal. See "^int(a|b|c|d)$" for
            details.
          const: legacy
        - description:
            Vendor-specific IRQ names. Consider using the generic names above
            for new bindings.
          oneOf:
            - description: See native "app" IRQ for details
              enum: [ intr, sys, pmc, msg, err ]

additionalProperties: true

required:
  - compatible
  - reg
  - reg-names

examples:
  - |
    pcie@dfc00000 {
      compatible = "snps,dw-pcie";
      device_type = "pci";
      reg = <0xdfc00000 0x0001000>, /* IP registers */
            <0xd0000000 0x0002000>; /* Configuration space */
      reg-names = "dbi", "config";
      #address-cells = <3>;
      #size-cells = <2>;
      ranges = <0x81000000 0 0x00000000 0xde000000 0 0x00010000>,
               <0x82000000 0 0xd0400000 0xd0400000 0 0x0d000000>;
      bus-range = <0x0 0xff>;

      interrupts = <25>, <24>;
      interrupt-names = "msi", "hp";
      #interrupt-cells = <1>;

      reset-gpios = <&port0 0 1>;

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

      num-lanes = <1>;
      max-link-speed = <3>;
    };