linux/Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
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   1Tegra SOC USB controllers
   2
   3The device node for a USB controller that is part of a Tegra
   4SOC is as described in the document "Open Firmware Recommended
   5Practice : Universal Serial Bus" with the following modifications
   6and additions :
   7
   8Required properties :
   9 - compatible : Should be "nvidia,tegra20-ehci".
  10 - nvidia,phy : phandle of the PHY that the controller is connected to.
  11 - clocks : Contains a single entry which defines the USB controller's clock.
  12
  13Optional properties:
  14 - nvidia,needs-double-reset : boolean is to be set for some of the Tegra20
  15   USB ports, which need reset twice due to hardware issues.
  16