menuconfig PM_DEVFREQ
  	bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"

  	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
  	  responsiblity 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
  	bool "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
  	bool "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
  	bool "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
  	bool "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 frequnecy
  	  given at the initialization.

  comment "DEVFREQ Drivers"

  config ARM_EXYNOS4_BUS_DEVFREQ
  	bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
  	depends on CPU_EXYNOS4210 || CPU_EXYNOS4212 || CPU_EXYNOS4412
  	select ARCH_HAS_OPP
  	select DEVFREQ_GOV_SIMPLE_ONDEMAND
  	help
  	  This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
  	  and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
  	  It reads PPMU counters of memory controllers and adjusts
  	  the operating frequencies and voltages with OPP support.
  	  To operate with optimal voltages, ASV support is required
  	  (CONFIG_EXYNOS_ASV).

  endif # PM_DEVFREQ