Mainline staging tree - This tree contains cleaned up patches that have/will be trying to enter mainline. This will get rebased but only for new versions of a patch series.
Linux v5.9 tree - Linux 5.9 with a mess of patches on top. Frozen. This is for validating that rebasing, cleaning up etc for 5.10 hasn’t busted anything.
Linux v5.10 Dirty work tree - This tree contains the most hardware support but is also a complete mess. Rebasing happens often here.
The current patcheset is at V4 and can be seen on patchwork or on msc313_mainlining branch on github. With those patches you can boot your Breadbee or 70mai Dash Cam boards with the serial console and initramfs. Not much more is working at this stage, though, not even a reset.
Bunch of purely DTS stuff. Adds SRAM, PMU and reboot support so that resetting now works.
Pushed - probably 5.11
** Cleaning up ** - Maybe fixed clocks and MPLL for 5.11?