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+* Renesas R-Car USB 2.0 clock selector
+
+This file provides information on what the device node for the R-Car USB 2.0
+clock selector.
+
+If you connect an external clock to the USB_EXTAL pin only, you should set
+the clock rate to "usb_extal" node only.
+If you connect an oscillator to both the USB_XTAL and USB_EXTAL, this module
+is not needed because this is default setting. (Of course, you can set the
+clock rates to both "usb_extal" and "usb_xtal" nodes.
+
+Case 1: An external clock connects to R-Car SoC
+	+----------+   +--- R-Car ---------------------+
+	|External  |---|USB_EXTAL ---> all usb channels|
+	|clock     |   |USB_XTAL                       |
+	+----------+   +-------------------------------+
+In this case, we need this driver with "usb_extal" clock.
+
+Case 2: An oscillator connects to R-Car SoC
+	+----------+   +--- R-Car ---------------------+
+	|Oscillator|---|USB_EXTAL -+-> all usb channels|
+	|          |---|USB_XTAL --+                   |
+	+----------+   +-------------------------------+
+In this case, we don't need this selector.
+
+Required properties:
+- compatible: "renesas,r8a7795-rcar-usb2-clock-sel" if the device is a part of
+	      an R8A7795 SoC.
+	      "renesas,r8a7796-rcar-usb2-clock-sel" if the device if a part of
+	      an R8A7796 SoC.
+	      "renesas,rcar-gen3-usb2-clock-sel" 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 2.0 clock selector register block.
+- clocks: A list of phandles and specifier pairs.
+- clock-names: Name of the clocks.
+ - The functional clock must be "ehci_ohci"
+ - The USB_EXTAL clock pin must be "usb_extal"
+ - The USB_XTAL clock pin must be "usb_xtal"
+- #clock-cells: Must be 0
+
+Example (R-Car H3):
+
+	usb2_clksel: clock-controller@e6590630 {
+		compatible = "renesas,r8a7795-rcar-usb2-clock-sel",
+			     "renesas,rcar-gen3-usb2-clock-sel";
+		reg = <0 0xe6590630 0 0x02>;
+		clocks = <&cpg CPG_MOD 703>, <&usb_extal>, <&usb_xtal>;
+		clock-names = "ehci_ohci", "usb_extal", "usb_xtal";
+		#clock-cells = <0>;
+	};