linux/Documentation/devicetree/bindings/usb/usb-phy.txt

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USB PHY
OMAP USB2 PHY
Required properties:
- compatible: Should be "ti,omap-usb2"
- reg : Address and length of the register set for the device.
Optional properties:
- ctrl-module : phandle of the control module used by PHY driver to power on
the PHY.
This is usually a subnode of ocp2scp to which it is connected.
usb2phy@4a0ad080 {
compatible = "ti,omap-usb2";
reg = <0x4a0ad080 0x58>;
ctrl-module = <&omap_control_usb>;
};