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AM57x Clock Governor

Executing some of the built in applications outputs the following lines to the screen:
"Power Management governor is currently set to ondemand."
"Temporarily setting governor to performance..."

I have read the following guide regarding this manner:

processors.wiki.ti.com/.../GLSDK_DRA7xx_PM_DVFS_User_Guide

But, am missing how it can be incorporated inside a QT project / application, so I'll be able to control the clock governor from within my program.

Also, can anyone share the conversion between voltage level and clock rate (i.e. 1.5Ghz -> 1.2V, etc..)?