xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml

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

title: Synopsys DWC PCIe RP/EP controller

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

description:
  Generic Synopsys DesignWare PCIe Root Port and Endpoint controller
  properties.

select: false

properties:
  reg:
    description:
      DWC PCIe CSR space is normally accessed over the dedicated Data Bus
      Interface - DBI. In accordance with the reference manual the register
      configuration space belongs to the Configuration-Dependent Module (CDM)
      and is split up into several sub-parts Standard PCIe configuration
      space, Port Logic Registers (PL), Shadow Config-space Registers,
      iATU/eDMA registers. The particular sub-space is selected by the
      CDM/ELBI (dbi_cs) and CS2 (dbi_cs2) signals (selector bits). Such
      configuration provides a flexible interface for the system engineers to
      either map the particular space at a desired MMIO address or just leave
      them in a contiguous memory space if pure Native or AXI Bridge DBI access
      is selected. Note the PCIe CFG-space, PL and Shadow registers are
      specific for each activated function, while the rest of the sub-spaces
      are common for all of them (if there are more than one).
    minItems: 2
    maxItems: 6

  reg-names:
    minItems: 2
    maxItems: 6

  interrupts:
    description:
      There are two main sub-blocks which are normally capable of
      generating interrupts. It's System Information Interface and MSI
      interface. While the former one has some common for the Host and
      Endpoint controllers IRQ-signals, the later interface is obviously
      Root Complex specific since it's responsible for the incoming MSI
      messages signalling. The System Information IRQ signals are mainly
      responsible for reporting the generic PCIe hierarchy and Root
      Complex events like VPD IO request, general AER, PME, Hot-plug, link
      bandwidth change, link equalization request, INTx asserted/deasserted
      Message detection, embedded DMA Tx/Rx/Error.
    minItems: 1
    maxItems: 26

  interrupt-names:
    minItems: 1
    maxItems: 26

  clocks:
    description:
      DWC PCIe reference manual explicitly defines a set of the clocks required
      to get the controller working correctly. In general all of them can
      be divided into two groups':' application and core clocks. Note the
      platforms may have some of the clock sources unspecified in case if the
      corresponding domains are fed up from a common clock source.
    minItems: 1
    maxItems: 7

  clock-names:
    minItems: 1
    maxItems: 7
    items:
      oneOf:
        - description:
            Data Bus Interface (DBI) clock. Clock signal for the AXI-bus
            interface of the Configuration-Dependent Module, which is
            basically the set of the controller CSRs.
          const: dbi
        - description:
            Application AXI-bus Master interface clock. Basically this is
            a clock for the controller DMA interface (PCI-to-CPU).
          const: mstr
        - description:
            Application AXI-bus Slave interface clock. This is a clock for
            the CPU-to-PCI memory IO interface.
          const: slv
        - description:
            Controller Core-PCS PIPE interface clock. It's normally
            supplied by an external PCS-PHY.
          const: pipe
        - description:
            Controller Primary clock. It's assumed that all controller input
            signals (except resets) are synchronous to this clock.
          const: core
        - description:
            Auxiliary clock for the controller PMC domain. The controller
            partitioning implies having some parts to operate with this
            clock in some power management states.
          const: aux
        - description:
            Generic reference clock. In case if there are several
            interfaces fed up with a common clock source it's advisable to
            define it with this name (for instance pipe, core and aux can
            be connected to a single source of the periodic signal).
          const: ref
        - description:
            Clock for the PHY registers interface. Originally this is
            a PHY-viewport-based interface, but some platform may have
            specifically designed one.
          const: phy_reg
        - description:
            Vendor-specific clock names. Consider using the generic names
            above for new bindings.
          oneOf:
            - description: See native 'dbi' clock for details
              enum: [ pcie, pcie_apb_sys, aclk_dbi ]
            - description: See native 'mstr/slv' clock for details
              enum: [ pcie_bus, pcie_inbound_axi, pcie_aclk, aclk_mst, aclk_slv ]
            - description: See native 'pipe' clock for details
              enum: [ pcie_phy, pcie_phy_ref, link ]
            - description: See native 'aux' clock for details
              enum: [ pcie_aux ]
            - description: See native 'ref' clock for details.
              enum: [ gio ]
            - description: See nativs 'phy_reg' clock for details
              enum: [ pcie_apb_phy, pclk ]

  resets:
    description:
      DWC PCIe reference manual explicitly defines a set of the reset
      signals required to be de-asserted to properly activate the controller
      sub-parts. All of these signals can be divided into two sub-groups':'
      application and core resets with respect to the main sub-domains they
      are supposed to reset. Note the platforms may have some of these signals
      unspecified in case if they are automatically handled or aggregated into
      a comprehensive control module.
    minItems: 1
    maxItems: 10

  reset-names:
    minItems: 1
    maxItems: 10
    items:
      oneOf:
        - description: Data Bus Interface (DBI) domain reset
          const: dbi
        - description: AXI-bus Master interface reset
          const: mstr
        - description: AXI-bus Slave interface reset
          const: slv
        - description: Application-dependent interface reset
          const: app
        - description: Controller Non-sticky CSR flags reset
          const: non-sticky
        - description: Controller sticky CSR flags reset
          const: sticky
        - description: PIPE-interface (Core-PCS) logic reset
          const: pipe
        - description:
            Controller primary reset (resets everything except PMC module)
          const: core
        - description: PCS/PHY block reset
          const: phy
        - description: PMC hot reset signal
          const: hot
        - description: Cold reset signal
          const: pwr
        - description:
            Vendor-specific reset names. Consider using the generic names
            above for new bindings.
          oneOf:
            - description: See native 'app' reset for details
              enum: [ apps, gio, apb ]
            - description: See native 'phy' reset for details
              enum: [ pciephy, link ]
            - description: See native 'pwr' reset for details
              enum: [ turnoff ]

  phys:
    description:
      There can be up to the number of possible lanes PHYs specified placed in
      the phandle array in the line-based order. Obviously each the specified
      PHYs are supposed to be able to work in the PCIe mode with a speed
      implied by the DWC PCIe controller they are attached to.
    minItems: 1
    maxItems: 16

  phy-names:
    minItems: 1
    maxItems: 16
    oneOf:
      - description: Generic PHY names
        items:
          pattern: '^pcie[0-9]+$'
      - description:
          Vendor-specific PHY names. Consider using the generic
          names above for new bindings.
        items:
          oneOf:
            - pattern: '^pcie(-?phy[0-9]*)?$'
            - pattern: '^p2u-[0-7]$'

  reset-gpio:
    deprecated: true
    description:
      Reference to the GPIO-controlled PERST# signal. It is used to reset all
      the peripheral devices available on the PCIe bus.
    maxItems: 1

  reset-gpios:
    description:
      Reference to the GPIO-controlled PERST# signal. It is used to reset all
      the peripheral devices available on the PCIe bus.
    maxItems: 1

  max-link-speed:
    maximum: 5

  num-lanes:
    description:
      Number of PCIe link lanes to use. Can be omitted if the already brought
      up link is supposed to be preserved.
    maximum: 16

  num-ob-windows:
    $ref: /schemas/types.yaml#/definitions/uint32
    deprecated: true
    description:
      Number of outbound address translation windows. This parameter can be
      auto-detected based on the iATU memory writability. So there is no
      point in having a dedicated DT-property for it.
    maximum: 256

  num-ib-windows:
    $ref: /schemas/types.yaml#/definitions/uint32
    deprecated: true
    description:
      Number of inbound address translation windows. In the same way as
      for the outbound AT windows, this parameter can be auto-detected based
      on the iATU memory writability. There is no point having a dedicated
      DT-property for it either.
    maximum: 256

  num-viewport:
    $ref: /schemas/types.yaml#/definitions/uint32
    deprecated: true
    description:
      Number of outbound view ports configured in hardware. It's the same as
      the number of outbound AT windows.
    maximum: 256

  snps,enable-cdm-check:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Enable automatic checking of CDM (Configuration Dependent Module)
      registers for data corruption. CDM registers include standard PCIe
      configuration space registers, Port Logic registers, DMA and iATU
      registers. This feature has been available since DWC PCIe v4.80a.

  dma-coherent: true

additionalProperties: true

...