Hi,
Where was the messiness given that most of the changes are to a brand new file?
From the "devel -> merge with upstream -> fixup breakage + commit -> devel" cycle. When rebasing *that* you simply don't get a nice + bisectable patch series. Early patches didn't apply cleanly due to buildsystem changes. After fixing up that ehci didn't build. Of course there are likely fixup patches coming later which solve that which I could try to find + cherry-pick + squash-in. But at that point I felt it simply isn't worth the trouble given that we would squash it all together anyway for patch review + upstream merge.
cheers, Gerd