[Hi3719C] Setting the CPU Frequency

The current SDK has five default CPU profiles (400 MHz, 600 MHz, 800 MHz, 1000 MHz,

and 1200 MHz).

To manually set the CPU frequency, disable dynamic CPU frequency and voltage scaling by

running the following command:

$ echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Then set the CPU frequency by running the following command:

$ echo 400000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

Where, 400000 is in kHz. That is, the CPU frequency is set to 400 MHz. Note that the CPU

voltage is also synchronized to the preset stable voltage that supports this frequency.