Kernel-4.18.0-80.el8_rcar-gen3-phy-usb3

• Renesas R-Car generation 3 USB 3.0 PHY

This file provides information on what the device node for the R-Car generation
3 USB 3.0 PHY contains.
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,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 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";
};