Merging Allwinner support

There are some silicon vendors who don't care too much about working with the Linux kernel community per se or getting their chips supported in the mainline kernel, but do a great job of explaining exactly what their chips do to anyone who will listen. They often have some demo code and examples, but these are written to be informative about their chips, rather than aligning well with the kernel design. What they care about is having chips that are well-documented and easy to work with, and software design decisions are not their job. They seem to do well, to the extent that their chips are actually nice to work with and their document is actually accurate, and the user community just goes off and writes whatever it needs.