There is no need to uncomment the clock gating exit/enter gadget functions,
since we define them void anyway.

There is no need to uncomment the call_gadget macro, since in our driver
it's getting defined void anyway.

Improve periodic USB transfers (device intr, isoc) used for input
devices, audio, and video. It's still not perfect, and will need
further improvements.

High level, the diff contains following chan

Improve periodic USB transfers (device intr, isoc) used for input
devices, audio, and video. It's still not perfect, and will need
further improvements.

High level, the diff contains following changes:

* Sync up with the Linux code base, which did re-work the periodic
scheduling code path.
* Run the driver in IPL_VM instead of IPL_USB to prioritize us before
lower/equal interrupts (same what NetBSD does).
* Add two new flags to our USB stack required by the updated driver
code:
- 'multi' flag in the usbd_hub structure to keep track whether
a hub has one Transaction Translator for all ports (single TT)
or one Transaction Translator per port (multi TT).
- 'hcpriv' pointer in the usbd_tt structure for the HC driver to
allocate memory for the scheduling depending on single or multi TT.

"go for it" kettenis@

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Sync dwctwo(4) with the NetBSD-current code base.

On the Raspberry Pi 3 Model B+ this does as a benefit:

* Enable the USB on-board Ethernet controller through mue(4).
* Enable the two USB uhub2 p

Sync dwctwo(4) with the NetBSD-current code base.

On the Raspberry Pi 3 Model B+ this does as a benefit:

* Enable the USB on-board Ethernet controller through mue(4).
* Enable the two USB uhub2 ports for removable devices.

Feedback incorporated from kettenis@ and jsg@.

ok kettenis@

show more ...

kill RCSID macros; discussed with millert

Replace dummy mutex asserts with real ones.

OK stsp@

Convert list_head lists into TAILQs and LISTs and fix up header includes
so we can build dwc2 without extra stuff.

tested by several edgerouter lite owners, ok jasper@

rearrange delayed_work to avoid the use of container_of while leaving it in
more or less the same shape.

ok uebayasi@

De-static for backtracing, but using #define to not change indent (for now).

Convert timeout(9)/taskq(9) usages.

s/mutex/mtx/
s/pool_cache/pool/
s/callout/timeout/
s/kmem/malloc/
s/workqueue/taskq/
s/softint/softintr/

Convert header paths.

Add RCS IDs.

Redo dwc2 import with CVS tags expanded.

Import dwc2 core and glue code from NetBSD. OK deraadt@ jsing@ miod@ mpi@