I think you might be skipping a few layers of abstraction there, but you could have something like a parametric PCIe or I2C core that would autogenerate both th

I think you might be skipping a few layers of abstraction there, but you could have something like a parametric PCIe or I2C core that would autogenerate both the hardware (de)serialization logic and the Linux-side driver logic. If your driver was written in Haskell, you could even use the exact same library on the hardware side and the software side. So let's say you have an FPGA card in a PCIe slot - with a change to a single file, you could change the wire protocol on both the Linux side and the FPGA side.