Looking at things like e.g. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin... , this is very obviously specific to the underlying hardware's control model in all sorts of ways. If the hardware has a gazillion control registers, then the software will have to handle a gazillion registers and will therefore need several gazillion definitions in order to do it. The hardware won't get any simpler just because it takes a long time to compile the driver.