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" for USB controllers
10   used in host mode.
11 - phy_type : Should be one of "ulpi" or "utmi".
12 - nvidia,vbus-gpio : If present, specifies a gpio that needs to be
13   activated for the bus to be powered.
14
15Optional properties:
16  - dr_mode : dual role mode. Indicates the working mode for
17    nvidia,tegra20-ehci compatible controllers.  Can be "host", "peripheral",
18    or "otg".  Default to "host" if not defined for backward compatibility.
19      host means this is a host controller
20      peripheral means it is device controller
21      otg means it can operate as either ("on the go")
22  - nvidia,has-legacy-mode : boolean indicates whether this controller can
23    operate in legacy mode (as APX 2500 / 2600). In legacy mode some
24    registers are accessed through the APB_MISC base address instead of
25    the USB controller.
26