drivers/devfreq/Kconfig

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