doc: dt-binding: cdns-salvo-phy: add binding doc

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

# Copyright (c) 2020 NXP

%YAML 1.2

---

$id: "http://devicetree.org/schemas/phy/cdns,salvo-phy.yaml#"

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

title: Cadence SALVO PHY

maintainers:

  - Peter Chen <peter.chen@nxp.com>

properties:

  compatible:

    enum:

      - nxp,salvo-phy

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

  clock-names:

    items:

      - const: salvo_phy_clk

  power-domains:

    maxItems: 1

  "#phy-cells":

    const: 0

required:

  - compatible

  - reg

  - "#phy-cells"

additionalProperties: false

examples:

  - |

    #include <dt-bindings/firmware/imx/rsrc.h>

    usb3phy: usb3-phy@5b160000 {

        compatible = "nxp,salvo-phy";

        reg = <0x5b160000 0x40000>;

        clocks = <&usb3_lpcg 4>;

        clock-names = "salvo_phy_clk";

        power-domains = <&pd IMX_SC_R_USB_2_PHY>;

        #phy-cells = <0>;

    };