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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 frequency
 65           given at the initialization.
 66 
 67 config DEVFREQ_GOV_PASSIVE
 68         tristate "Passive"
 69         help
 70           Sets the frequency based on the frequency of its parent devfreq
 71           device. This governor does not change the frequency by itself
 72           through sysfs entries. The passive governor recommends that
 73           devfreq device uses the OPP table to get the frequency/voltage.
 74 
 75 comment "DEVFREQ Drivers"
 76 
 77 config ARM_EXYNOS_BUS_DEVFREQ
 78         bool "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
 79         depends on ARCH_EXYNOS
 80         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 81         select DEVFREQ_GOV_PASSIVE
 82         select DEVFREQ_EVENT_EXYNOS_PPMU
 83         select PM_DEVFREQ_EVENT
 84         select PM_OPP
 85         help
 86           This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
 87           Memory bus has one more group of memory bus (e.g, MIF and INT block).
 88           Each memory bus group could contain many memoby bus block. It reads
 89           PPMU counters of memory controllers by using DEVFREQ-event device
 90           and adjusts the operating frequencies and voltages with OPP support.
 91           This does not yet operate with optimal voltages.
 92 
 93 config ARM_TEGRA_DEVFREQ
 94        tristate "Tegra DEVFREQ Driver"
 95        depends on ARCH_TEGRA_124_SOC
 96        select DEVFREQ_GOV_SIMPLE_ONDEMAND
 97        select PM_OPP
 98        help
 99          This adds the DEVFREQ driver for the Tegra family of SoCs.
100          It reads ACTMON counters of memory controllers and adjusts the
101          operating frequencies and voltages with OPP support.
102 
103 source "drivers/devfreq/event/Kconfig"
104 
105 endif # PM_DEVFREQ

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