dt-bindings: phy: renesas: usb3-phy: convert bindings to json-schema

* Renesas R-Car generation 3 USB 3.0 PHY

This file provides information on what the device node for the R-Car generation

3 and RZ/G2 USB 3.0 PHY contain.

If you want to enable spread spectrum clock (ssc), you should use USB_EXTAL

instead of USB3_CLK. However, if you don't want to these features, you don't

need this driver.

Required properties:

- compatible: "renesas,r8a774a1-usb3-phy" if the device is a part of an R8A774A1

	      SoC.

	      "renesas,r8a774b1-usb3-phy" if the device is a part of an R8A774B1

	      SoC.

	      "renesas,r8a7795-usb3-phy" if the device is a part of an R8A7795

	      SoC.

	      "renesas,r8a7796-usb3-phy" if the device is a part of an R8A7796

	      SoC.

	      "renesas,r8a77965-usb3-phy" if the device is a part of an

	      R8A77965 SoC.

	      "renesas,rcar-gen3-usb3-phy" for a generic R-Car Gen3 or RZ/G2

	      compatible device.

	      When compatible with the generic version, nodes must list the

	      SoC-specific version corresponding to the platform first

	      followed by the generic version.

- reg: offset and length of the USB 3.0 PHY register block.

- clocks: A list of phandles and clock-specifier pairs.

- clock-names: Name of the clocks.

  - The funcional clock must be "usb3-if".

  - The usb3's external clock must be "usb3s_clk".

  - The usb2's external clock must be "usb_extal". If you want to use the ssc,

    the clock-frequency must not be 0.

- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.

Optional properties:

- renesas,ssc-range: Enable/disable spread spectrum clock (ssc) by using

		     the following values as u32:

			- 0 (or the property doesn't exist): disable the ssc

			- 4980: enable the ssc as -4980 ppm

			- 4492: enable the ssc as -4492 ppm

			- 4003: enable the ssc as -4003 ppm

Example (R-Car H3):

	usb-phy@e65ee000 {

		compatible = "renesas,r8a7795-usb3-phy",

			     "renesas,rcar-gen3-usb3-phy";

		reg = <0 0xe65ee000 0 0x90>;

		clocks = <&cpg CPG_MOD 328>, <&usb3s0_clk>, <&usb_extal>;

		clock-names = "usb3-if", "usb3s_clk", "usb_extal";

	};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/phy/renesas,usb3-phy.yaml#

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

title: Renesas R-Car generation 3 USB 3.0 PHY

maintainers:

  - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

properties:

  compatible:

    items:

      - enum:

          - renesas,r8a774a1-usb3-phy # RZ/G2M

          - renesas,r8a774b1-usb3-phy # RZ/G2N

          - renesas,r8a7795-usb3-phy  # R-Car H3

          - renesas,r8a7796-usb3-phy  # R-Car M3-W

          - renesas,r8a77965-usb3-phy # R-Car M3-N

      - const: renesas,rcar-gen3-usb3-phy

  reg:

    maxItems: 1

  clocks:

    minItems: 2

    maxItems: 3

  clock-names:

    # If you want to use the ssc, the clock-frequency of usb_extal

    # must not be 0.

    minItems: 2

    maxItems: 3

    items:

      - const: usb3-if # The funcional clock

      - const: usb3s_clk # The usb3's external clock

      - const: usb_extal # The usb2's external clock

  '#phy-cells':

    # see phy-bindings.txt in the same directory

    const: 0

  power-domains:

    maxItems: 1

  resets:

    maxItems: 1

  renesas,ssc-range:

    description: |

      Enable/disable spread spectrum clock (ssc). 0 or the property doesn't

      exist means disabling the ssc. The actual value will be -<value> ppm.

    allOf:

      - $ref: /schemas/types.yaml#/definitions/uint32

      - enum: [ 0, 4003, 4492, 4980 ]

required:

  - compatible

  - reg

  - clocks

  - clock-names

  - '#phy-cells'

additionalProperties: false

examples:

  - |

    #include <dt-bindings/clock/r8a7795-cpg-mssr.h>

    #include <dt-bindings/power/r8a7795-sysc.h>

    usb-phy@e65ee000 {

        compatible = "renesas,r8a7795-usb3-phy", "renesas,rcar-gen3-usb3-phy";

        reg = <0xe65ee000 0x90>;

        clocks = <&cpg CPG_MOD 328>, <&usb3s0_clk>, <&usb_extal>;

        clock-names = "usb3-if", "usb3s_clk", "usb_extal";

        #phy-cells = <0>;

    };