Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml

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

title: Qualcomm PCIe Endpoint Controller binding

maintainers:
  - Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

allOf:
  - $ref: "pci-ep.yaml#"

properties:
  compatible:
    const: qcom,sdx55-pcie-ep

  reg:
    items:
      - description: Qualcomm-specific PARF configuration registers
      - description: DesignWare PCIe registers
      - description: External local bus interface registers
      - description: Address Translation Unit (ATU) registers
      - description: Memory region used to map remote RC address space
      - description: BAR memory region

  reg-names:
    items:
      - const: parf
      - const: dbi
      - const: elbi
      - const: atu
      - const: addr_space
      - const: mmio

  clocks:
    items:
      - description: PCIe Auxiliary clock
      - description: PCIe CFG AHB clock
      - description: PCIe Master AXI clock
      - description: PCIe Slave AXI clock
      - description: PCIe Slave Q2A AXI clock
      - description: PCIe Sleep clock
      - description: PCIe Reference clock

  clock-names:
    items:
      - const: aux
      - const: cfg
      - const: bus_master
      - const: bus_slave
      - const: slave_q2a
      - const: sleep
      - const: ref

  qcom,perst-regs:
    description: Reference to a syscon representing TCSR followed by the two
                 offsets within syscon for Perst enable and Perst separation
                 enable registers
    $ref: "/schemas/types.yaml#/definitions/phandle-array"
    items:
      minItems: 3
      maxItems: 3

  interrupts:
    items:
      - description: PCIe Global interrupt
      - description: PCIe Doorbell interrupt

  interrupt-names:
    items:
      - const: global
      - const: doorbell

  reset-gpios:
    description: GPIO used as PERST# input signal
    maxItems: 1

  wake-gpios:
    description: GPIO used as WAKE# output signal
    maxItems: 1

  resets:
    maxItems: 1

  reset-names:
    const: core

  power-domains:
    maxItems: 1

  phys:
    maxItems: 1

  phy-names:
    const: pciephy

  num-lanes:
    default: 2

required:
  - compatible
  - reg
  - reg-names
  - clocks
  - clock-names
  - qcom,perst-regs
  - interrupts
  - interrupt-names
  - reset-gpios
  - resets
  - reset-names
  - power-domains

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/clock/qcom,gcc-sdx55.h>
    #include <dt-bindings/gpio/gpio.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    pcie_ep: pcie-ep@40000000 {
        compatible = "qcom,sdx55-pcie-ep";
        reg = <0x01c00000 0x3000>,
              <0x40000000 0xf1d>,
              <0x40000f20 0xc8>,
              <0x40001000 0x1000>,
              <0x40002000 0x1000>,
              <0x01c03000 0x3000>;
        reg-names = "parf", "dbi", "elbi", "atu", "addr_space",
                    "mmio";

        clocks = <&gcc GCC_PCIE_AUX_CLK>,
             <&gcc GCC_PCIE_CFG_AHB_CLK>,
             <&gcc GCC_PCIE_MSTR_AXI_CLK>,
             <&gcc GCC_PCIE_SLV_AXI_CLK>,
             <&gcc GCC_PCIE_SLV_Q2A_AXI_CLK>,
             <&gcc GCC_PCIE_SLEEP_CLK>,
             <&gcc GCC_PCIE_0_CLKREF_CLK>;
        clock-names = "aux", "cfg", "bus_master", "bus_slave",
                      "slave_q2a", "sleep", "ref";

        qcom,perst-regs = <&tcsr 0xb258 0xb270>;

        interrupts = <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>;
        interrupt-names = "global", "doorbell";
        reset-gpios = <&tlmm 57 GPIO_ACTIVE_LOW>;
        wake-gpios = <&tlmm 53 GPIO_ACTIVE_LOW>;
        resets = <&gcc GCC_PCIE_BCR>;
        reset-names = "core";
        power-domains = <&gcc PCIE_GDSC>;
        phys = <&pcie0_lane>;
        phy-names = "pciephy";
        max-link-speed = <3>;
        num-lanes = <2>;
    };