linux/Documentation/devicetree/bindings/usb/usb3503.txt
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   1SMSC USB3503 High-Speed Hub Controller
   2
   3Required properties:
   4- compatible: Should be "smsc,usb3503".
   5- reg: Specifies the i2c slave address, it should be 0x08.
   6- connect-gpios: Should specify GPIO for connect.
   7- intn-gpios: Should specify GPIO for interrupt.
   8- reset-gpios: Should specify GPIO for reset.
   9- initial-mode: Should specify initial mode.
  10                (1 for HUB mode, 2 for STANDBY mode)
  11
  12Examples:
  13        usb3503@08 {
  14                compatible = "smsc,usb3503";
  15                reg = <0x08>;
  16                connect-gpios = <&gpx3 0 1>;
  17                intn-gpios = <&gpx3 4 1>;
  18                reset-gpios = <&gpx3 5 1>;
  19                initial-mode = <1>;
  20        };
  21