linux/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
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   1* Freescale i.MX ci13xxx usb controllers
   2
   3Required properties:
   4- compatible: Should be "fsl,imx27-usb"
   5- reg: Should contain registers location and length
   6- interrupts: Should contain controller interrupt
   7
   8Recommended properies:
   9- phy_type: the type of the phy connected to the core. Should be one
  10  of "utmi", "utmi_wide", "ulpi", "serial" or "hsic". Without this
  11  property the PORTSC register won't be touched
  12- dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
  13
  14Optional properties:
  15- fsl,usbphy: phandler of usb phy that connects to the only one port
  16- fsl,usbmisc: phandler of non-core register device, with one argument
  17  that indicate usb controller index
  18- vbus-supply: regulator for vbus
  19- disable-over-current: disable over current detect
  20- external-vbus-divider: enables off-chip resistor divider for Vbus
  21
  22Examples:
  23usb@02184000 { /* USB OTG */
  24        compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
  25        reg = <0x02184000 0x200>;
  26        interrupts = <0 43 0x04>;
  27        fsl,usbphy = <&usbphy1>;
  28        fsl,usbmisc = <&usbmisc 0>;
  29        disable-over-current;
  30        external-vbus-divider;
  31};
  32