UM0851 datasheet(241/245 Pages) STMICROELECTRONICS

241 / 245 page

UM0851

Power management section

Doc ID 16604 Rev 2

241/245

10.5.3

Linux CPU freq framework

Table 67.

Linux CPUfreq framework configuration options

Configuration options

Comment

CONFIG_CPU_FREQ

This option is used to enable the CPU frequency

scaling option

Default CPU Freq Governor Choice

This option sets which CPUfreq governor is loaded

at startup. The default is Performance.

CONFIG_CPU_FREQ_GOV_PERFORMANCE

This CPUfreq governor sets the frequency

statically to the highest available CPU frequency.

CONFIG_CPU_FREQ_GOV_POWERSAVE

This CPU freq governor sets the frequency

statically to the lowest available CPU frequency.

CONFIG_CPU_FREQ_GOV_USERSPACE

Enable this CPUfreq governor when you either

want to set the CPU frequency manually or when

an user space program must be able to set the

CPU dynamically

CONFIG_CPU_FREQ_GOV_ONDEMAND

This driver adds a dynamic CPUfreq policy

governor. The governor does a periodic polling

and changes frequency based on the CPU

utilization.

CONFIG_CPU_FREQ_GOV_CONSERVATIVE

This driver is rather similar to the 'on demand'

governor both in its source code and its purpose,

the difference is its optimization for better

suitability in a battery powered environment.

CONFIG_CPU_FREQ_STAT

This driver exports CPU frequency statistics

information through sysfs file system. Presently

not supported in the driver.

UM0851 Datasheet(PDF) 241 Page - STMicroelectronics