dt-bindings: PCI: Add binding for Toshiba TC9563 PCIe switch

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/pci/toshiba,tc9563.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Toshiba TC9563 PCIe switch

maintainers:

  - Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>

description: |

  Toshiba TC9563 PCIe switch has one upstream and three downstream ports.

  The 3rd downstream port has integrated endpoint device of Ethernet MAC.

  Other two downstream ports are supposed to connect to external device.

  The TC9563 PCIe switch can be configured through I2C interface before

  PCIe link is established to change FTS, ASPM related entry delays,

  tx amplitude etc for better power efficiency and functionality.

properties:

  compatible:

    enum:

      - pci1179,0623

  reg:

    maxItems: 1

  resx-gpios:

    maxItems: 1

    description:

      GPIO controlling the RESX# pin.

  vdd18-supply: true

  vdd09-supply: true

  vddc-supply: true

  vddio1-supply: true

  vddio2-supply: true

  vddio18-supply: true

  i2c-parent:

    $ref: /schemas/types.yaml#/definitions/phandle-array

    description:

      A phandle to the parent I2C node and the slave address of the device

      used to configure tc9563 to change FTS, tx amplitude etc.

    items:

      - description: Phandle to the I2C controller node

      - description: I2C slave address

patternProperties:

  "^pcie@[1-3],0$":

    description:

      child nodes describing the internal downstream ports of

      the tc9563 switch.

    type: object

    allOf:

      - $ref: "#/$defs/tc9563-node"

      - $ref: /schemas/pci/pci-pci-bridge.yaml#

    unevaluatedProperties: false

$defs:

  tc9563-node:

    type: object

    properties:

      toshiba,tx-amplitude-microvolt:

        description:

          Change Tx Margin setting for low power consumption.

      toshiba,no-dfe-support:

        type: boolean

        description:

          Disable DFE (Decision Feedback Equalizer), which mitigates

          intersymbol interference and some reflections caused by

          impedance mismatches.

required:

  - resx-gpios

  - vdd18-supply

  - vdd09-supply

  - vddc-supply

  - vddio1-supply

  - vddio2-supply

  - vddio18-supply

  - i2c-parent

allOf:

  - $ref: "#/$defs/tc9563-node"

  - $ref: /schemas/pci/pci-bus-common.yaml#

unevaluatedProperties: false

examples:

  - |

    #include <dt-bindings/gpio/gpio.h>

    pcie {

        #address-cells = <3>;

        #size-cells = <2>;

        pcie@0 {

            device_type = "pci";

            reg = <0x0 0x0 0x0 0x0 0x0>;

            #address-cells = <3>;

            #size-cells = <2>;

            ranges;

            bus-range = <0x01 0xff>;

            pcie@0,0 {

                compatible = "pci1179,0623";

                reg = <0x10000 0x0 0x0 0x0 0x0>;

                device_type = "pci";

                #address-cells = <3>;

                #size-cells = <2>;

                ranges;

                bus-range = <0x02 0xff>;

                i2c-parent = <&qup_i2c 0x77>;

                vdd18-supply = <&vdd>;

                vdd09-supply = <&vdd>;

                vddc-supply = <&vdd>;

                vddio1-supply = <&vdd>;

                vddio2-supply = <&vdd>;

                vddio18-supply = <&vdd>;

                resx-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;

                pcie@1,0 {

                    compatible = "pciclass,0604";

                    reg = <0x20800 0x0 0x0 0x0 0x0>;

                    #address-cells = <3>;

                    #size-cells = <2>;

                    device_type = "pci";

                    ranges;

                    bus-range = <0x03 0xff>;

                    toshiba,no-dfe-support;

                };

                pcie@2,0 {

                    compatible = "pciclass,0604";

                    reg = <0x21000 0x0 0x0 0x0 0x0>;

                    #address-cells = <3>;

                    #size-cells = <2>;

                    device_type = "pci";

                    ranges;

                    bus-range = <0x04 0xff>;

                };

                pcie@3,0 {

                    compatible = "pciclass,0604";

                    reg = <0x21800 0x0 0x0 0x0 0x0>;

                    #address-cells = <3>;

                    #size-cells = <2>;

                    device_type = "pci";

                    ranges;

                    bus-range = <0x05 0xff>;

                    toshiba,tx-amplitude-microvolt = <10>;

                    ethernet@0,0 {

                        reg = <0x50000 0x0 0x0 0x0 0x0>;

                    };

                    ethernet@0,1 {

                        reg = <0x50100 0x0 0x0 0x0 0x0>;

                    };

                };

            };

        };

    };