• Martin Blumenstingl's avatar
    usb: add a flag to skip PHY initialization to struct usb_hcd · 4e88d4c0
    Martin Blumenstingl authored
    The USB HCD core driver parses the device-tree node for "phys" and
    "usb-phys" properties. It also manages the power state of these PHYs
    automatically.
    However, drivers may opt-out of this behavior by setting "phy" or
    "usb_phy" in struct usb_hcd to a non-null value. An example where this
    is required is the "Qualcomm USB2 controller", implemented by the
    chipidea driver. The hardware requires that the PHY is only powered on
    after the "reset completed" event from the controller is received.
    
    A follow-up patch will allow the USB HCD core driver to manage more than
    one PHY. Add a new "skip_phy_initialization" bitflag to struct usb_hcd
    so drivers can opt-out of any PHY management provided by the USB HCD
    core driver.
    
    This also updates the existing drivers so they use the new flag if they
    want to opt out of the PHY management provided by the USB HCD core
    driver. This means that for these drivers the new "multiple PHY"
    handling (which will be added in a follow-up patch) will be disabled as
    well.
    Signed-off-by: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
    Acked-by: default avatarPeter Chen <peter.chen@nxp.com>
    Tested-by: default avatarNeil Armstrong <narmstrong@baylibre.con>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    4e88d4c0
host.c 6.01 KB