diff options
| author | Simon Glass <sjg@chromium.org> | 2012-03-06 21:04:32 -0800 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-03-07 14:36:44 -0800 |
| commit | d5dfcc91b179f40652318b9f3d76c31d2f908000 (patch) | |
| tree | ff1cd52b8e89ece6e47b46705d8da2743603be68 /Documentation/devicetree | |
| parent | 96d6714ca27acab087dcc8d75a7ec815abe3dde7 (diff) | |
| download | linux-d5dfcc91b179f40652318b9f3d76c31d2f908000.tar.gz linux-d5dfcc91b179f40652318b9f3d76c31d2f908000.tar.bz2 linux-d5dfcc91b179f40652318b9f3d76c31d2f908000.zip | |
arm: tegra: dts: Support host/device selection and legacy mode
Some USB ports can support host and device operation. We add the dr_mode
property (as found in Freescale) for this.
One USB port has a 'legacy mode', left over from the days of pre-Tegra
chips. I don't believe this is actually used, except that we must know
to turn this off in the driver.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/usb/tegra-usb.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/usb/tegra-usb.txt b/Documentation/devicetree/bindings/usb/tegra-usb.txt index 035d63d5646d..007005ddbe12 100644 --- a/Documentation/devicetree/bindings/usb/tegra-usb.txt +++ b/Documentation/devicetree/bindings/usb/tegra-usb.txt @@ -11,3 +11,16 @@ Required properties : - 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. + +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. |