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Linux/drivers/devfreq/Kconfig

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

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