path: root/Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
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authorAnton Arapov <>2012-10-29 11:15:37 +0100
committerAnton Arapov <>2012-10-29 11:15:37 +0100
commit7d558cd9c7b18e4b16953265aa0da45e63f3b968 (patch)
tree7135d5a810768c9c619346282ee9cfdf1765e225 /Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt
parent985ef6b2108ed28ffd5f6630e1e0fce2e2a775f2 (diff)
fedora kernel: cd394142aac30b5c751f25b517572e2448695641v3.6.3-2f17
Signed-off-by: Anton Arapov <>
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+Tegra SOC USB controllers
+The device node for a USB controller that is part of a Tegra
+SOC is as described in the document "Open Firmware Recommended
+Practice : Universal Serial Bus" with the following modifications
+and additions :
+Required properties :
+ - compatible : Should be "nvidia,tegra20-ehci" for USB controllers
+ used in host mode.
+ - phy_type : Should be one of "ulpi" or "utmi".
+ - nvidia,vbus-gpio : If present, specifies a gpio that needs to be
+ activated for the bus to be powered.
+Required properties for phy_type == ulpi:
+ - nvidia,phy-reset-gpio : The GPIO used to reset the PHY.
+Optional properties:
+ - dr_mode : dual role mode. Indicates the working mode for
+ nvidia,tegra20-ehci compatible controllers. Can be "host", "peripheral",
+ or "otg". Default to "host" if not defined for backward compatibility.
+ host means this is a host controller
+ peripheral means it is device controller
+ otg means it can operate as either ("on the go")
+ - nvidia,has-legacy-mode : boolean indicates whether this controller can
+ operate in legacy mode (as APX 2500 / 2600). In legacy mode some
+ registers are accessed through the APB_MISC base address instead of
+ the USB controller. Since this is a legacy issue it probably does not
+ warrant a compatible string of its own.