Patch merged into coreboot/master: pcengines/apu1: Enable USB overcurrent detection.

the following patch was just integrated into master:
commit 3385ebe59a452ce66e0180641de271b028a41e7e
Author: Tobias Diedrich 
Date:   Sun Mar 13 21:19:45 2016 +0100

pcengines/apu1: Enable USB overcurrent detection.

The two external USB ports and the internal USB header have overcurrent
    protection chips with the low-active overcurrent signal connected to the
    chipset.

The power-on default for this register disables the software detection
    of overcurrent conditions.

After setting the register Linux correctly shows the overcurrent
    condition in the kernel log (tested by shorting the 5v and gnd lines on
    J14 / the internal USB header):
    [ 2015.229921] usb usb1-port3: over-current condition
    [ 2015.449925] usb usb1-port4: over-current condition

Simlar for the external ports:
    [  256.237916] usb usb1-port1: over-current condition
    [  256.458084] usb usb1-port5: over-current condition

Note that each signal is shared between two ports:
    usboc0#: External ports (port1/5)
    usboc1#: Internal ports (port3/4)

Change-Id: I02d498053b8ec61dc206e74a96c4a1dcfd4fae92
    Signed-off-by: Tobias Diedrich 
    Reviewed-on: https://review.coreboot.org/14084
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/14084 for details.

-gerrit