1 Tegra SOC USB controllers
3 The device node for a USB controller that is part of a Tegra
4 SOC is as described in the document "Open Firmware Recommended
5 Practice : Universal Serial Bus" with the following modifications
9 - compatible : Should be "nvidia,tegra20-ehci" for USB controllers
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.
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. Since this is a legacy issue it probably does not
26 warrant a compatible string of its own.