The CPU support is already pretty good and for example Huawei is pushing important Linux kernel patches. What you are talking about is drivers for peripherals,

The CPU support is already pretty good and for example Huawei is pushing important Linux kernel patches. What you are talking about is drivers for peripherals, which is are SoC-level issues, and really up to the partners (like Allwinner, SiPeed, etc). So far documentation is the most critical part and it's a very mixed bag. I think this will be much like the Arm experience, albeit everyone is at least using device trees these days.