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AM5726: How to change A15 frequency in Processor SDK?

Tony Tang
Mastermind 30667 points

Part Number: AM5726

How to change A15 frequency under Linux on the fly? Did not find such files in AM57xx PSDK filesystem:

Driver Usage

All of the standard governors are built-in to the kernel, and by default the ondemand governor is selected.

To view available governors,

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
conservative userspace powersave ondemand performance

To view current governor,

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand

To set a governor,

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

To view current OPP (frequency in kHz)

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
720000

To view supported OPP’s (frequency in kHz),

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
275000 500000 600000 720000

To change OPP (can be done only for userspace governor. If governors like ondemand is used, OPP change happens automatically based on the system load)

$ echo 275000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed


the real content is below:
root@am57xx-evm:/sys/devices/system/cpu/cpu0# ls
cpu_capacity of_node subsystem uevent
hotplug power topology
root@am57xx-evm:/sys/devices/system/cpu/cpu0#
root@am57xx-evm:/sys/devices/system/cpu/cpu0#