Actually I think their plan is to continue not competing by acquiring all competition, as is now the norm in the semiconductor business. They call it "consolidation" but lets not mistake it for what it is.
This looks just like some list of existing drivers, regardless of who wrote them.
It was done this way to try to make it easier for people to find the drivers, rather than rolling through kernel source. The Majority of the drivers are upstream (including the ones ADI writes), or are in process of going upstream, but some drivers - because of their development flow - will never meet upstream kernel coding guidelines.
[Disclaimer - I work at ADI].