On Sunday 21 July 2013, Domenico Andreoli wrote:

quoted

bonus points if you use soc_device_register();

What is the system_rev variable actually used for?

I use it to show something sensible in /proc/cpuinfo, to report
whether the soc is  a 4760 or 4761 and the silicon revision.

If the proper way to deal with this has so much boilerplate as
you say, I think I'll drop it altogether. I'd like to print the info
somewhere in the bootlog anyway.

btw this could well be one of the accesses requiring the io
mapping above.

If it's just for informational purposes, soc_device_register() sounds like
the correct place to put that information, you can register a couple
of strings there that get put into sysfs at a known location for the
SoC, and keeps the cpuinfo for the actual CPU core.

	Arnd