From: Simon Glass Date: Wed, 7 Mar 2012 05:04:32 +0000 (-0800) Subject: arm: tegra: dts: Support host/device selection and legacy mode X-Git-Tag: v3.4-rc1~71^2~1^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d5dfcc91b179f40652318b9f3d76c31d2f908000;p=karo-tx-linux.git 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 Acked-by: Stephen Warren Signed-off-by: Olof Johansson --- 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.