Default [Q] How to obtaing GPU and RAM frequency from the Android filesystem

I would like to know how to read de GPU and RAM operation frequency from the Android filesystem. I know that I can obtain the CPU frequency from files such as:
I'm trying to do that with Pandaboard, but in fact I need to do it in more development boards (Odroid-PC, Beagleboard-xM, Sabreboard and Wandboard).

Any idea? at least how to do that with an app? I tried with CPU-z but it do not has this information. Also, I tried with commands such as dumpsys without success.

Thanks in advance.