Merge tag 'usb-for-v4.6' of http://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

Felipe writes:

usb changes for v4.6 merge window

This is almost all under drivers/usb/dwc2/. Many
changes to the host side implementation of dwc2 have
been done by Douglas Anderson.

We also have USB 3.1 support added to the Gadget
Framework and, because of that work, dwc3 got
support to Synopsys new DWC_usb31 IP core.

Other than these 2 important series, we also have
the usual collection of non-critical fixes,
Documentation updates, and minor changes all over
the place.

Documentation/usb/chipidea.txt

@@ -26,16 +26,17 @@ cat /sys/kernel/debug/ci_hdrc.0/registers
    On B-device:
    echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
 
-   if HNP polling is not supported, also need:
-   On A-device:
-   echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
-
    B-device should take host role and enumrate A-device.
 
 4) A-device switch back to host.
    On B-device:
    echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
 
+   or, by introducing HNP polling, B-Host can know when A-peripheral wish
+   to be host role, so this role switch also can be trigged in A-peripheral
+   side by answering the polling from B-Host, this can be done on A-device:
+   echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
+
    A-device should switch back to host and enumrate B-device.
 
 5) Remove B-device(unplug micro B plug) and insert again in 10 seconds,