Experiments never use the lda driver directly (instead they use a controller entry in the DDB) so exporting the driver at the top level does not improve the public API.

I'm planning to export in devices/*/__init__.py only those parts of drivers that need to be executed locally and used directly by the experiment; for example, the high-level PDQ or PXI DAC card APIs that need to define kernels that generate timing pulses.

Apart from the fact that the stack of commits is messed up:

• pdq2: Putting actual code (not just namespace mangling) into __init__.py is irritating because then you never know in which file to look for a class, especially if there are other files next to __init__.py. If there are no other modules in the same directoty, rename module/__init__.py to module.py and delete the directory.
• Cleaning up and flattening the API is a good idea whether public or not.