menuconfig PM_DEVFREQ
  	bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
  	select SRCU
  	select PM_OPP
  	help
  	  A device may have a list of frequencies and voltages available.
  	  devfreq, a generic DVFS framework can be registered for a device
  	  in order to let the governor provided to devfreq choose an
  	  operating frequency based on the device driver's policy.
  
  	  Each device may have its own governor and policy. Devfreq can
  	  reevaluate the device state periodically and/or based on the
  	  notification to "nb", a notifier block, of devfreq.
  
  	  Like some CPUs with CPUfreq, a device may have multiple clocks.
  	  However, because the clock frequencies of a single device are
  	  determined by the single device's state, an instance of devfreq
  	  is attached to a single device and returns a "representative"
  	  clock frequency of the device, which is also attached
  	  to a device by 1-to-1. The device registering devfreq takes the
  	  responsibility to "interpret" the representative frequency and
  	  to set its every clock accordingly with the "target" callback
  	  given to devfreq.
  
  	  When OPP is used with the devfreq device, it is recommended to
  	  register devfreq's nb to the OPP's notifier head.  If OPP is
  	  used with the devfreq device, you may use OPP helper
  	  functions defined in devfreq.h.
  
  if PM_DEVFREQ
  
  comment "DEVFREQ Governors"
  
  config DEVFREQ_GOV_SIMPLE_ONDEMAND
  	tristate "Simple Ondemand"
  	help
  	  Chooses frequency based on the recent load on the device. Works
  	  similar as ONDEMAND governor of CPUFREQ does. A device with
  	  Simple-Ondemand should be able to provide busy/total counter
  	  values that imply the usage rate. A device may provide tuned
  	  values to the governor with data field at devfreq_add_device().
  
  config DEVFREQ_GOV_PERFORMANCE
  	tristate "Performance"
  	help
  	  Sets the frequency at the maximum available frequency.
  	  This governor always returns UINT_MAX as frequency so that
  	  the DEVFREQ framework returns the highest frequency available
  	  at any time.
  
  config DEVFREQ_GOV_POWERSAVE
  	tristate "Powersave"
  	help
  	  Sets the frequency at the minimum available frequency.
  	  This governor always returns 0 as frequency so that
  	  the DEVFREQ framework returns the lowest frequency available
  	  at any time.
  
  config DEVFREQ_GOV_USERSPACE
  	tristate "Userspace"
  	help
  	  Sets the frequency at the user specified one.
  	  This governor returns the user configured frequency if there
  	  has been an input to /sys/devices/.../power/devfreq_set_freq.
  	  Otherwise, the governor does not change the frequency
  	  given at the initialization.
  
  config DEVFREQ_GOV_PASSIVE
  	tristate "Passive"
  	help
  	  Sets the frequency based on the frequency of its parent devfreq
  	  device. This governor does not change the frequency by itself
  	  through sysfs entries. The passive governor recommends that
  	  devfreq device uses the OPP table to get the frequency/voltage.
  
  comment "DEVFREQ Drivers"
  
  config ARM_EXYNOS_BUS_DEVFREQ
  	tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
  	depends on ARCH_EXYNOS || COMPILE_TEST
  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
  	select DEVFREQ_GOV_PASSIVE
  	select DEVFREQ_EVENT_EXYNOS_PPMU
  	select PM_DEVFREQ_EVENT
  	select PM_OPP
  	help
  	  This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
  	  Memory bus has one more group of memory bus (e.g, MIF and INT block).
  	  Each memory bus group could contain many memoby bus block. It reads
  	  PPMU counters of memory controllers by using DEVFREQ-event device
  	  and adjusts the operating frequencies and voltages with OPP support.
  	  This does not yet operate with optimal voltages.
  
  config ARM_TEGRA_DEVFREQ
  	tristate "Tegra DEVFREQ Driver"
  	depends on ARCH_TEGRA_124_SOC
  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
  	select PM_OPP
  	help
  	  This adds the DEVFREQ driver for the Tegra family of SoCs.
  	  It reads ACTMON counters of memory controllers and adjusts the
  	  operating frequencies and voltages with OPP support.
  
  config ARM_RK3399_DMC_DEVFREQ
  	tristate "ARM RK3399 DMC DEVFREQ Driver"
  	depends on ARCH_ROCKCHIP
  	select DEVFREQ_EVENT_ROCKCHIP_DFI
  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
  	select PM_DEVFREQ_EVENT
  	select PM_OPP
  	help
            This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
            It sets the frequency for the memory controller and reads the usage counts
            from hardware.
  
  source "drivers/devfreq/event/Kconfig"
  
  endif # PM_DEVFREQ