Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/devfreq/Kconfig

  1 menuconfig PM_DEVFREQ
  2         bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
  3         select SRCU
  4         help
  5           A device may have a list of frequencies and voltages available.
  6           devfreq, a generic DVFS framework can be registered for a device
  7           in order to let the governor provided to devfreq choose an
  8           operating frequency based on the device driver's policy.
  9 
 10           Each device may have its own governor and policy. Devfreq can
 11           reevaluate the device state periodically and/or based on the
 12           notification to "nb", a notifier block, of devfreq.
 13 
 14           Like some CPUs with CPUfreq, a device may have multiple clocks.
 15           However, because the clock frequencies of a single device are
 16           determined by the single device's state, an instance of devfreq
 17           is attached to a single device and returns a "representative"
 18           clock frequency of the device, which is also attached
 19           to a device by 1-to-1. The device registering devfreq takes the
 20           responsibility to "interpret" the representative frequency and
 21           to set its every clock accordingly with the "target" callback
 22           given to devfreq.
 23 
 24           When OPP is used with the devfreq device, it is recommended to
 25           register devfreq's nb to the OPP's notifier head.  If OPP is
 26           used with the devfreq device, you may use OPP helper
 27           functions defined in devfreq.h.
 28 
 29 if PM_DEVFREQ
 30 
 31 comment "DEVFREQ Governors"
 32 
 33 config DEVFREQ_GOV_SIMPLE_ONDEMAND
 34         tristate "Simple Ondemand"
 35         help
 36           Chooses frequency based on the recent load on the device. Works
 37           similar as ONDEMAND governor of CPUFREQ does. A device with
 38           Simple-Ondemand should be able to provide busy/total counter
 39           values that imply the usage rate. A device may provide tuned
 40           values to the governor with data field at devfreq_add_device().
 41 
 42 config DEVFREQ_GOV_PERFORMANCE
 43         tristate "Performance"
 44         help
 45           Sets the frequency at the maximum available frequency.
 46           This governor always returns UINT_MAX as frequency so that
 47           the DEVFREQ framework returns the highest frequency available
 48           at any time.
 49 
 50 config DEVFREQ_GOV_POWERSAVE
 51         tristate "Powersave"
 52         help
 53           Sets the frequency at the minimum available frequency.
 54           This governor always returns 0 as frequency so that
 55           the DEVFREQ framework returns the lowest frequency available
 56           at any time.
 57 
 58 config DEVFREQ_GOV_USERSPACE
 59         tristate "Userspace"
 60         help
 61           Sets the frequency at the user specified one.
 62           This governor returns the user configured frequency if there
 63           has been an input to /sys/devices/.../power/devfreq_set_freq.
 64           Otherwise, the governor does not change the frequnecy
 65           given at the initialization.
 66 
 67 comment "DEVFREQ Drivers"
 68 
 69 config ARM_EXYNOS4_BUS_DEVFREQ
 70         bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
 71         depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM
 72         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 73         select PM_OPP
 74         help
 75           This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
 76           and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
 77           It reads PPMU counters of memory controllers and adjusts
 78           the operating frequencies and voltages with OPP support.
 79           This does not yet operate with optimal voltages.
 80 
 81 config ARM_EXYNOS5_BUS_DEVFREQ
 82         tristate "ARM Exynos5250 Bus DEVFREQ Driver"
 83         depends on SOC_EXYNOS5250
 84         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 85         select PM_OPP
 86         help
 87           This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int).
 88           It reads PPMU counters of memory controllers and adjusts the
 89           operating frequencies and voltages with OPP support.
 90 
 91 config ARM_TEGRA_DEVFREQ
 92        tristate "Tegra DEVFREQ Driver"
 93        depends on ARCH_TEGRA_124_SOC
 94        select DEVFREQ_GOV_SIMPLE_ONDEMAND
 95        select PM_OPP
 96        help
 97          This adds the DEVFREQ driver for the Tegra family of SoCs.
 98          It reads ACTMON counters of memory controllers and adjusts the
 99          operating frequencies and voltages with OPP support.
100 
101 source "drivers/devfreq/event/Kconfig"
102 
103 endif # PM_DEVFREQ

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us