Hi dimtass,
We document chip_personality—this configures UCM1 vs UCM2 operation (4/4/16 vs 24x7).
The max frequencies are based upon chip ID, your observation is correct that some CD575M chips are not capable of running at the same clocks as CD580M.
So, setting personality is okay and we document how to do this, but users should not change any other settings in the kernel or could jeopardize the stability and reliability of the system.
Thanks