From mboxrd@z Thu Jan 1 00:00:00 1970 From: sjg@chromium.org (Simon Glass) Date: Fri, 3 Feb 2012 08:56:10 -0800 Subject: [PATCH 1/3] arm: tegra: dts: Support host/device selection and legacy mode In-Reply-To: <1328288172-8059-1-git-send-email-sjg@chromium.org> References: <1328288172-8059-1-git-send-email-sjg@chromium.org> Message-ID: <1328288172-8059-2-git-send-email-sjg@chromium.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- .../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 035d63d..007005d 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. -- 1.7.7.3