CSI (sun4i_csi) driver on MainLine kernel

[Tarkus]

Hello Everyone!
I faced with some problems with csi driver on mainline kernel. The study of the Internet did not give any result. Probably someone already done the same things, and could answer on couple of my questions?
My configuration: custom board based on A20 SoC (quite similar with Olimex Lime2), armbian-buster-desktop 20.05.0, Linux Kernel 5.4.41, and OV5640 CSI camera connected to CSI0 in parallel 8bit mode.
My questions are:
1) Can anyone confirm that the sun4i_csi module in Mainline kernel works (with any CSI camera)?
2) Does the sun4i_csi module work with CSI1 port too?
3) If someone already run OV5640 via CSI on A20 SoC, what is the maximum fps can be reach at FullHD mode? (I estimate that I can reach 30fps, but I'm not sure about that).

I will be very grateful for any information, links, dts, patches, sources, and so.