hwmon: pmbus: Question about header files

[Vasileios Amoiridis <vassilisamir@gmail.com>]

Hello hwmon and PMBUS community,

I am currently studying how the PMBUS subsystem works because I am trying to
write a driver for a PSU and submit for review. I noticed that the subsystem is
quite intelligent and it manages to do most of the stuff in the pmbus_core.c
leaving a minimum amount of work to be done in the actual device driver!!

I have a question though, regarding the header files <include/linux/pmbus.h> and
<drivers/hwmon/pmbus/pmbus.h>. With my limited experience in kernel development,
I would expect that the drivers/hwmon/pmbus/pmbus.h file would include stuff
that are used only by the pmbus_core.c/pmbus.c while anything that could be
potentially used from the device drivers would go to the include/linux/pmbus.h.

Is my reasoning wrong? What was the reasoning behind the split between those 2
files?

Thanks a lot for your time!

Best regards,
Vasilis