drivers/devfreq/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 menuconfig PM_DEVFREQ
   3         bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
   4         select SRCU
   5         select PM_OPP
   6         help
   7           A device may have a list of frequencies and voltages available.
   8           devfreq, a generic DVFS framework can be registered for a device
   9           in order to let the governor provided to devfreq choose an
  10           operating frequency based on the device driver's policy.
  11
  12           Each device may have its own governor and policy. Devfreq can
  13           reevaluate the device state periodically and/or based on the
  14           notification to "nb", a notifier block, of devfreq.
  15
  16           Like some CPUs with CPUfreq, a device may have multiple clocks.
  17           However, because the clock frequencies of a single device are
  18           determined by the single device's state, an instance of devfreq
  19           is attached to a single device and returns a "representative"
  20           clock frequency of the device, which is also attached
  21           to a device by 1-to-1. The device registering devfreq takes the
  22           responsibility to "interpret" the representative frequency and
  23           to set its every clock accordingly with the "target" callback
  24           given to devfreq.
  25
  26           When OPP is used with the devfreq device, it is recommended to
  27           register devfreq's nb to the OPP's notifier head.  If OPP is
  28           used with the devfreq device, you may use OPP helper
  29           functions defined in devfreq.h.
  30
  31 if PM_DEVFREQ
  32
  33 comment "DEVFREQ Governors"
  34
  35 config DEVFREQ_GOV_SIMPLE_ONDEMAND
  36         tristate "Simple Ondemand"
  37         help
  38           Chooses frequency based on the recent load on the device. Works
  39           similar as ONDEMAND governor of CPUFREQ does. A device with
  40           Simple-Ondemand should be able to provide busy/total counter
  41           values that imply the usage rate. A device may provide tuned
  42           values to the governor with data field at devfreq_add_device().
  43
  44 config DEVFREQ_GOV_PERFORMANCE
  45         tristate "Performance"
  46         help
  47           Sets the frequency at the maximum available frequency.
  48           This governor always returns UINT_MAX as frequency so that
  49           the DEVFREQ framework returns the highest frequency available
  50           at any time.
  51
  52 config DEVFREQ_GOV_POWERSAVE
  53         tristate "Powersave"
  54         help
  55           Sets the frequency at the minimum available frequency.
  56           This governor always returns 0 as frequency so that
  57           the DEVFREQ framework returns the lowest frequency available
  58           at any time.
  59
  60 config DEVFREQ_GOV_USERSPACE
  61         tristate "Userspace"
  62         help
  63           Sets the frequency at the user specified one.
  64           This governor returns the user configured frequency if there
  65           has been an input to /sys/devices/.../power/devfreq_set_freq.
  66           Otherwise, the governor does not change the frequency
  67           given at the initialization.
  68
  69 config DEVFREQ_GOV_PASSIVE
  70         tristate "Passive"
  71         help
  72           Sets the frequency based on the frequency of its parent devfreq
  73           device. This governor does not change the frequency by itself
  74           through sysfs entries. The passive governor recommends that
  75           devfreq device uses the OPP table to get the frequency/voltage.
  76
  77 comment "DEVFREQ Drivers"
  78
  79 config ARM_EXYNOS_BUS_DEVFREQ
  80         tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
  81         depends on ARCH_EXYNOS || COMPILE_TEST
  82         select DEVFREQ_GOV_SIMPLE_ONDEMAND
  83         select DEVFREQ_GOV_PASSIVE
  84         select DEVFREQ_EVENT_EXYNOS_PPMU
  85         select PM_DEVFREQ_EVENT
  86         select PM_OPP
  87         help
  88           This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
  89           Memory bus has one more group of memory bus (e.g, MIF and INT block).
  90           Each memory bus group could contain many memoby bus block. It reads
  91           PPMU counters of memory controllers by using DEVFREQ-event device
  92           and adjusts the operating frequencies and voltages with OPP support.
  93           This does not yet operate with optimal voltages.
  94
  95 config ARM_TEGRA_DEVFREQ
  96         tristate "Tegra DEVFREQ Driver"
  97         depends on ARCH_TEGRA_124_SOC
  98         select DEVFREQ_GOV_SIMPLE_ONDEMAND
  99         select PM_OPP
 100         help
 101           This adds the DEVFREQ driver for the Tegra family of SoCs.
 102           It reads ACTMON counters of memory controllers and adjusts the
 103           operating frequencies and voltages with OPP support.
 104
 105 config ARM_RK3399_DMC_DEVFREQ
 106         tristate "ARM RK3399 DMC DEVFREQ Driver"
 107         depends on ARCH_ROCKCHIP
 108         select DEVFREQ_EVENT_ROCKCHIP_DFI
 109         select DEVFREQ_GOV_SIMPLE_ONDEMAND
 110         select PM_DEVFREQ_EVENT
 111         select PM_OPP
 112         help
 113           This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
 114           It sets the frequency for the memory controller and reads the usage counts
 115           from hardware.
 116
 117 source "drivers/devfreq/event/Kconfig"
 118
 119 endif # PM_DEVFREQ