Hi Greg, Sasha, Jaakub and David,
This patch series contains backports for a change that recently made it upstream as f9b3827ee66cfcf297d0acd6ecf33653a5f297ef ("net: dsa: b53: Support setting learning on port") however that commit depends on infrastructure that landed in v5.12-rc1.
The way this was fixed in the netdev group's net tree is slightly different from how it should be backported to stable trees which is why you will find a patch for each branch in the thread started by this cover letter. The commit used as a Fixes: base dates back from when the driver was first introduced into the tree since this should have been fixed from day one ideally.
Let me know if this does not apply for some reason. The changes from 4.9 through 4.19 are nearly identical and then from 5.4 through 5.11 are about the same.
Thank you very much!