Dear Ilya Yanok,
Current MUSB driver in U-Boot uses old UDC API while new gagdet client drivers need new gadget API. Also current MUSB driver has some significant limitations (like inability to handle tx for endpoints other than ep0). So I think port of new Linux driver is desirable.
This is initial port, performed mostly by putting DM and OTG code under #ifndef __UBOOT__ clauses. My intention was to be as close as possible to the original to ease of possible resyncs. Some warnings are suppressed via CFLAGS. There are some style problems but I'm not touching them for now for the above mentioned reason. There is obviously some room for optimisation, some structure fields are unused as well as (probably) some code.
This is not a replacement for existing MUSB driver (at least for now), cause there are still consumers of USB serial gadget which uses old API and there is no support for serial with new API for now.
OTG and DMA are not supported. Ported drivers include: musb_dsps (should work both with TI AM33xx and TI81xx, tested only on AM33xx), am35x (tested on AM3517 EVM) and omap2plus (should work on OMAP2/3/4, tested on omap3_beagle, omap4_panda doesn't work and needs more work). Others should be easy to port too.
Virtual root hub is not implemented but this shouldn't be a big problem as the old code has virtual root hub support enabled only for Blackfin platform.
Pathes are rather big because of the original code size (and I didn't delete unused code, just disabled it). So it's probably better to look at changes as compared to Linux code. I prepared such version also, you can find it at [1]. Hopefully it will be also useful if resync with the kernel will be needed in future.
[1] https://github.com/yanok/u-boot/tree/musb-changes-from-linux-v4
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What is this patchset ? I received another similar one, but which is more complete ...