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	  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 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