xref: /openbmc/linux/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml (revision e4dffb67)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pci/nvidia,tegra194-pcie-ep.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: NVIDIA Tegra194 (and later) PCIe Endpoint controller (Synopsys DesignWare Core based)

maintainers:
  - Thierry Reding <thierry.reding@gmail.com>
  - Jon Hunter <jonathanh@nvidia.com>
  - Vidya Sagar <vidyas@nvidia.com>

description: |
  This PCIe controller is based on the Synopsys DesignWare PCIe IP and thus
  inherits all the common properties defined in snps,dw-pcie-ep.yaml.  Some
  of the controller instances are dual mode; they can work either in Root
  Port mode or Endpoint mode but one at a time.

  On Tegra194, controllers C0, C4 and C5 support Endpoint mode.

  Note: On Tegra194's P2972-0000 platform, only C5 controller can be enabled to
  operate in the Endpoint mode because of the way the platform is designed.

properties:
  compatible:
    enum:
      - nvidia,tegra194-pcie-ep

  reg:
    items:
      - description: controller's application logic registers
      - description: iATU and DMA registers. This is where the iATU (internal
          Address Translation Unit) registers of the PCIe core are made
          available for software access.
      - description: aperture where the Root Port's own configuration
          registers are available.
      - description: aperture used to map the remote Root Complex address space

  reg-names:
    items:
      - const: appl
      - const: atu_dma
      - const: dbi
      - const: addr_space

  interrupts:
    items:
      - description: controller interrupt

  interrupt-names:
    items:
      - const: intr

  clocks:
    items:
      - description: module clock

  clock-names:
    items:
      - const: core

  resets:
    items:
      - description: APB bus interface reset
      - description: module reset

  reset-names:
    items:
      - const: apb
      - const: core

  reset-gpios:
    description: Must contain a phandle to a GPIO controller followed by GPIO
      that is being used as PERST input signal. Please refer to pci.txt.

  phys:
    minItems: 1
    maxItems: 8

  phy-names:
    minItems: 1
    items:
      - const: p2u-0
      - const: p2u-1
      - const: p2u-2
      - const: p2u-3
      - const: p2u-4
      - const: p2u-5
      - const: p2u-6
      - const: p2u-7

  power-domains:
    maxItems: 1
    description: |
      A phandle to the node that controls power to the respective PCIe
      controller and a specifier name for the PCIe controller.

      Specifiers defined in "include/dt-bindings/power/tegra194-powergate.h".

  interconnects:
    items:
      - description: memory read client
      - description: memory write client

  interconnect-names:
    items:
      - const: dma-mem # read
      - const: write

  dma-coherent: true

  nvidia,bpmp:
    $ref: /schemas/types.yaml#/definitions/phandle-array
    description: |
      Must contain a pair of phandles to BPMP controller node followed by
      controller ID. Following are the controller IDs for each controller:

        0: C0
        1: C1
        2: C2
        3: C3
        4: C4
        5: C5
    items:
      - items:
          - description: phandle to BPMP controller node
          - description: PCIe controller ID
            maximum: 5

  nvidia,aspm-cmrt-us:
    description: Common Mode Restore Time for proper operation of ASPM to be
      specified in microseconds

  nvidia,aspm-pwr-on-t-us:
    description: Power On time for proper operation of ASPM to be specified in
      microseconds

  nvidia,aspm-l0s-entrance-latency-us:
    description: ASPM L0s entrance latency to be specified in microseconds

  vddio-pex-ctl-supply:
    description: A phandle to the regulator supply for PCIe side band signals

  nvidia,refclk-select-gpios:
    maxItems: 1
    description: GPIO used to enable REFCLK to controller from the host

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

unevaluatedProperties: false

required:
  - interrupts
  - interrupt-names
  - clocks
  - clock-names
  - resets
  - reset-names
  - power-domains
  - reset-gpios
  - vddio-pex-ctl-supply
  - num-lanes
  - phys
  - phy-names
  - nvidia,bpmp

examples:
  - |
    #include <dt-bindings/clock/tegra194-clock.h>
    #include <dt-bindings/gpio/tegra194-gpio.h>
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/power/tegra194-powergate.h>
    #include <dt-bindings/reset/tegra194-reset.h>

    bus@0 {
        #address-cells = <2>;
        #size-cells = <2>;
        ranges = <0x0 0x0 0x0 0x8 0x0>;

        pcie-ep@141a0000 {
            compatible = "nvidia,tegra194-pcie-ep";
            reg = <0x00 0x141a0000 0x0 0x00020000>, /* appl registers (128K) */
                  <0x00 0x3a040000 0x0 0x00040000>, /* iATU_DMA reg space (256K)  */
                  <0x00 0x3a080000 0x0 0x00040000>, /* DBI reg space (256K) */
                  <0x1c 0x00000000 0x4 0x00000000>; /* Address Space (16G) */
            reg-names = "appl", "atu_dma", "dbi", "addr_space";
            interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>; /* controller interrupt */
            interrupt-names = "intr";

            clocks = <&bpmp TEGRA194_CLK_PEX1_CORE_5>;
            clock-names = "core";

            resets = <&bpmp TEGRA194_RESET_PEX1_CORE_5_APB>,
                     <&bpmp TEGRA194_RESET_PEX1_CORE_5>;
            reset-names = "apb", "core";

            power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8A>;
            pinctrl-names = "default";
            pinctrl-0 = <&clkreq_c5_bi_dir_state>;

            nvidia,bpmp = <&bpmp 5>;

            nvidia,aspm-cmrt-us = <60>;
            nvidia,aspm-pwr-on-t-us = <20>;
            nvidia,aspm-l0s-entrance-latency-us = <3>;

            vddio-pex-ctl-supply = <&vdd_1v8ao>;

            reset-gpios = <&gpio TEGRA194_MAIN_GPIO(GG, 1) GPIO_ACTIVE_LOW>;

            nvidia,refclk-select-gpios = <&gpio_aon TEGRA194_AON_GPIO(AA, 5)
                                          GPIO_ACTIVE_HIGH>;

            num-lanes = <8>;

            phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
                   <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
                   <&p2u_nvhs_6>, <&p2u_nvhs_7>;

            phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
                        "p2u-5", "p2u-6", "p2u-7";
        };
    };