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_EVENT_EXYNOS_PPMU
  82         select PM_DEVFREQ_EVENT
  83         select PM_OPP
  84         help
  85           This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
  86           Memory bus has one more group of memory bus (e.g, MIF and INT block).
  87           Each memory bus group could contain many memoby bus block. It reads
  88           PPMU counters of memory controllers by using DEVFREQ-event device
  89           and adjusts the operating frequencies and voltages with OPP support.
  90           This does not yet operate with optimal voltages.
  91
  92 config ARM_EXYNOS4_BUS_DEVFREQ
  93         bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
  94         depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM
  95         select DEVFREQ_GOV_SIMPLE_ONDEMAND
  96         select PM_OPP
  97         help
  98           This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
  99           and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
 100           It reads PPMU counters of memory controllers and adjusts
 101           the operating frequencies and voltages with OPP support.
 102           This does not yet operate with optimal voltages.
 103
 104 config ARM_EXYNOS5_BUS_DEVFREQ
 105         tristate "ARM Exynos5250 Bus DEVFREQ Driver"
 106         depends on SOC_EXYNOS5250
 107         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 108         select PM_OPP
 109         help
 110           This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int).
 111           It reads PPMU counters of memory controllers and adjusts the
 112           operating frequencies and voltages with OPP support.
 113
 114 config ARM_TEGRA_DEVFREQ
 115        tristate "Tegra DEVFREQ Driver"
 116        depends on ARCH_TEGRA_124_SOC
 117        select DEVFREQ_GOV_SIMPLE_ONDEMAND
 118        select PM_OPP
 119        help
 120          This adds the DEVFREQ driver for the Tegra family of SoCs.
 121          It reads ACTMON counters of memory controllers and adjusts the
 122          operating frequencies and voltages with OPP support.
 123
 124 source "drivers/devfreq/event/Kconfig"
 125
 126 endif # PM_DEVFREQ