Hi Mark,
This series is mainly a cleanup series. In the beginning of the rt5651 machine driver some wrong assumptions were made, such as the headset mic being attached to IN2 (it is on IN3 on the 7 machines I have access to and on all otherwise known machines).
And also adding a quirk for a machine with the intmic on IN2, which later got fixed with a new quirk for machines with 2 internal mics on both IN1 and IN2 and moving the one machine with the IN2 quirk over to the new IN1_IN2 quirk, leaving the IN2 quirk as an orphan quirk for non existing hardware.
Then I made a similar mistake adding the IN2_HS_IN3 quirk, while I should have used the IN1_HS_IN3 (which itself only exists because the original IN1 quirk has the headset input mapping wrong),
TL;DR: it is a bit of a mess due to a number of wrong assumptions about how the inputs where actually routed in the past.
This series cleans this all up in small commits / one bit a time and refers the original commit messages in its commit messages.
Note patch 10/11 is not a cleanup patch, but is more or less the reason I took a second look at all the quirks.
Regards,
Hans