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    Subject[PATCH 1/3] arm: tegra: dts: Support host/device selection and legacy mode
    Date
    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>
    ---
    .../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


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