This is exactly what I am struggling with as well - what's the point of having it in the upstream, when developers CAN'T TEST THE DRIVER WITH THE DEVICE. Just

This is exactly what I am struggling with as well - what's the point of having it in the upstream, when developers CAN'T TEST THE DRIVER WITH THE DEVICE. Just provide some stable API for drivers and let hardware developers do their job. Microsoft Windows understood this, why is it so difficult for Linux Kernel do get the memo.