The attached patch enables support for LCD display and limited audio
support for pinebook-pro-rk3399.

With this, the Pinebook Pro gets display output on the built-in LCD.

Console works, wayland works (tested with sway), presumably X.org would
work as well (untested).

Audio output on headphones kind of works.

Trackpad is still a little sketchy; might require enabling some more
modules.

This should basically obsolete the need for the wip-pinebook-pro branch;
I haven't noticed any significant functionality difference.


I believe the same patches and changes apply and work more-or-less
unchanged for linux-libre 5.10 lts series (I tested against Debian's
5.10.x kernel), and it might be worth having an LTS kernel with this
enabled. If that's considered desireable, I can update the patch to add
that too.


Since this will require rebuilding the linux-libre tarball, it is
probably best to wait to merge this until the next batch of linux-libre
updates (e.g. linux-libre 5.11.x and 5.10.x, no need to wait till 5.12).


If USB-C DisplayPort ever becomes supported and working on pinebook-pro,
this patch will need to be removed.


live well,
  vagrant