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         tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
  79         depends on ARCH_EXYNOS || COMPILE_TEST
  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 config ARM_RK3399_DMC_DEVFREQ
 104         tristate "ARM RK3399 DMC DEVFREQ Driver"
 105         depends on ARCH_ROCKCHIP
 106         select DEVFREQ_EVENT_ROCKCHIP_DFI
 107         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 108         select PM_DEVFREQ_EVENT
 109         select PM_OPP
 110         help
 111           This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
 112           It sets the frequency for the memory controller and reads the usage counts
 113           from hardware.
 114
 115 source "drivers/devfreq/event/Kconfig"
 116
 117 endif # PM_DEVFREQ