Cleaned device tree is coming up at 5.10.y while our implementation is based on a quick fork from Friendly Elec kernel. We need to change DT name and also add support for hardware random generator
https://github.com/jayanta525/openwrt-nanopi-r2s/pull/9/files

https://patchwork.ozlabs.org/project/uboot/patch/20200331094001.13441-3-troy.lin@rock-chips.com/