From: Lech Perczaklech.perczak@gmail.com
commit 88eee9b7b42e69fb622ddb3ff6f37e8e4347f5b2 upstream.
As commit 6420a569504e212d618d4a4736e2c59ed80a8478: ("USB: serial: option: update interface mapping for ZTE P685M") [1] was selected for stable, I think its netdev counterpart could also be considered for completeness, if 6420a569504e is merged.
This patch only adds a new device ID, and would probably make OpenWrt folks happy to drop two backports. I noticed that 6420a569504e was selected for all currently maintained stable branches, but I think that only 5.4.y and newer would suffice, as 5.4.y is currently used as stable kernel where those two patches are required.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/dr...
-- With kind regards, Lech