xref: /linux/Documentation/devicetree/bindings/connector/pcie-m2-m-connector.yaml (revision c17ee635fd3a482b2ad2bf5e269755c2eae5f25e)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/connector/pcie-m2-m-connector.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: PCIe M.2 Mechanical Key M Connector

maintainers:
  - Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>

description:
  A PCIe M.2 M connector node represents a physical PCIe M.2 Mechanical Key M
  connector. The Mechanical Key M connectors are used to connect SSDs to the
  host system over PCIe/SATA interfaces. These connectors also offer optional
  interfaces like USB, SMBus.

properties:
  compatible:
    const: pcie-m2-m-connector

  vpcie3v3-supply:
    description: A phandle to the regulator for 3.3v supply.

  vpcie1v8-supply:
    description: A phandle to the regulator for VIO 1.8v supply.

  ports:
    $ref: /schemas/graph.yaml#/properties/ports
    description: OF graph bindings modeling the interfaces exposed on the
      connector. Since a single connector can have multiple interfaces, every
      interface has an assigned OF graph port number as described below.

    properties:
      port@0:
        $ref: /schemas/graph.yaml#/properties/port
        description: PCIe interface

      port@1:
        $ref: /schemas/graph.yaml#/properties/port
        description: SATA interface

      port@2:
        $ref: /schemas/graph.yaml#/properties/port
        description: USB 2.0 interface

    anyOf:
      - required:
          - port@0
      - required:
          - port@1

  i2c-parent:
    $ref: /schemas/types.yaml#/definitions/phandle
    description: I2C interface

  clocks:
    description: 32.768 KHz Suspend Clock (SUSCLK) input from the host system to
      the M.2 card. Refer, PCI Express M.2 Specification r4.0, sec 3.1.12.1 for
      more details.
    maxItems: 1

  pedet-gpios:
    description: GPIO input to PEDET signal. This signal is used by the host
      systems to determine the communication protocol that the M.2 card uses;
      SATA signaling (low) or PCIe signaling (high). Refer, PCI Express M.2
      Specification r4.0, sec 3.3.4.2 for more details.
    maxItems: 1

  viocfg-gpios:
    description: GPIO input to IO voltage configuration (VIO_CFG) signal. This
      signal is used by the host systems to determine whether the card supports
      an independent IO voltage domain for the sideband signals or not. Refer,
      PCI Express M.2 Specification r4.0, sec 3.1.15.1 for more details.
    maxItems: 1

  pwrdis-gpios:
    description: GPIO output to Power Disable (PWRDIS) signal. This signal is
      used by the host system to disable power on the M.2 card. Refer, PCI
      Express M.2 Specification r4.0, sec 3.3.5.2 for more details.
    maxItems: 1

  pln-gpios:
    description: GPIO output to Power Loss Notification (PLN#) signal. This
      signal is used by the host system to notify the M.2 card that the power
      loss event is about to occur. Refer, PCI Express M.2 Specification r4.0,
      sec 3.2.17.1 for more details.
    maxItems: 1

  plas3-gpios:
    description: GPIO input to Power Loss Acknowledge (PLA_S3#) signal. This
      signal is used by the host system to receive the acknowledgment of the M.2
      card's preparation for power loss.
    maxItems: 1

required:
  - compatible
  - vpcie3v3-supply

additionalProperties: false

examples:
  # PCI M.2 Key M connector for SSDs with PCIe interface
  - |
    #include <dt-bindings/gpio/gpio.h>

    connector {
        compatible = "pcie-m2-m-connector";
        vpcie3v3-supply = <&vreg_nvme>;
        i2c-parent = <&i2c0>;
        pedet-gpios = <&tlmm 95 GPIO_ACTIVE_HIGH>;
        viocfg-gpios = <&tlmm 96 GPIO_ACTIVE_HIGH>;
        pwrdis-gpios = <&tlmm 97 GPIO_ACTIVE_HIGH>;
        pln-gpios = <&tlmm 98 GPIO_ACTIVE_LOW>;
        plas3-gpios = <&tlmm 99 GPIO_ACTIVE_LOW>;

        ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@0 {
                #address-cells = <1>;
                #size-cells = <0>;

                reg = <0>;

                endpoint@0 {
                    reg = <0>;
                    remote-endpoint = <&pcie6_port0_ep>;
                };
            };

            port@2 {
                #address-cells = <1>;
                #size-cells = <0>;

                reg = <2>;

                endpoint@0 {
                    reg = <0>;
                    remote-endpoint = <&usb_hs_ep>;
                };
            };
        };
    };