menu "CPU Frequency scaling"

  config CPU_FREQ
  	bool "CPU Frequency scaling"

  	select SRCU

  	help
  	  CPU Frequency scaling allows you to change the clock speed of 
  	  CPUs on the fly. This is a nice method to save power, because 
  	  the lower the CPU clock speed, the less power the CPU consumes.
  
  	  Note that this driver doesn't automatically change the CPU
  	  clock speed, you need to either enable a dynamic cpufreq governor
  	  (see below) after boot, or use a userspace tool.
  
  	  For details, take a look at <file:Documentation/cpu-freq>.
  
  	  If in doubt, say N.
  
  if CPU_FREQ

  config CPU_FREQ_GOV_COMMON
  	bool

  config CPU_FREQ_BOOST_SW
  	bool
  	depends on THERMAL

  config CPU_FREQ_STAT

  	tristate "CPU frequency translation statistics"

  	default y
  	help
  	  This driver exports CPU frequency statistics information through sysfs
  	  file system.
  
  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_stats.
  
  	  If in doubt, say N.

  
  config CPU_FREQ_STAT_DETAILS

  	bool "CPU frequency translation statistics details"
  	depends on CPU_FREQ_STAT
  	help
  	  This will show detail CPU frequency translation table in sysfs file
  	  system.
  
  	  If in doubt, say N.

  
  choice
  	prompt "Default CPUFreq governor"

  	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ

  	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  	help
  	  This option sets which CPUFreq governor shall be loaded at
  	  startup. If in doubt, select 'performance'.
  
  config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  	bool "performance"
  	select CPU_FREQ_GOV_PERFORMANCE
  	help
  	  Use the CPUFreq governor 'performance' as default. This sets
  	  the frequency statically to the highest frequency supported by
  	  the CPU.

  config CPU_FREQ_DEFAULT_GOV_POWERSAVE
  	bool "powersave"

  	select CPU_FREQ_GOV_POWERSAVE
  	help
  	  Use the CPUFreq governor 'powersave' as default. This sets
  	  the frequency statically to the lowest frequency supported by
  	  the CPU.

  config CPU_FREQ_DEFAULT_GOV_USERSPACE
  	bool "userspace"
  	select CPU_FREQ_GOV_USERSPACE
  	help
  	  Use the CPUFreq governor 'userspace' as default. This allows

  	  you to set the CPU frequency manually or when a userspace 

  	  program shall be able to set the CPU dynamically without having
  	  to enable the userspace governor manually.

  config CPU_FREQ_DEFAULT_GOV_ONDEMAND
  	bool "ondemand"
  	select CPU_FREQ_GOV_ONDEMAND
  	select CPU_FREQ_GOV_PERFORMANCE
  	help
  	  Use the CPUFreq governor 'ondemand' as default. This allows
  	  you to get a full dynamic frequency capable system by simply
  	  loading your cpufreq low-level hardware driver.
  	  Be aware that not all cpufreq drivers support the ondemand
  	  governor. If unsure have a look at the help section of the
  	  driver. Fallback governor will be the performance governor.
  
  config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
  	bool "conservative"
  	select CPU_FREQ_GOV_CONSERVATIVE
  	select CPU_FREQ_GOV_PERFORMANCE
  	help
  	  Use the CPUFreq governor 'conservative' as default. This allows
  	  you to get a full dynamic frequency capable system by simply
  	  loading your cpufreq low-level hardware driver.
  	  Be aware that not all cpufreq drivers support the conservative
  	  governor. If unsure have a look at the help section of the
  	  driver. Fallback governor will be the performance governor.

  endchoice
  
  config CPU_FREQ_GOV_PERFORMANCE

  	tristate "'performance' governor"
  	help

  	  This cpufreq governor sets the frequency statically to the
  	  highest available CPU frequency.

  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_performance.

  	  If in doubt, say Y.
  
  config CPU_FREQ_GOV_POWERSAVE

  	tristate "'powersave' governor"
  	help

  	  This cpufreq governor sets the frequency statically to the
  	  lowest available CPU frequency.

  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_powersave.

  	  If in doubt, say Y.
  
  config CPU_FREQ_GOV_USERSPACE

  	tristate "'userspace' governor for userspace frequency scaling"
  	help

  	  Enable this cpufreq governor when you either want to set the

  	  CPU frequency manually or when a userspace program shall

  	  be able to set the CPU dynamically, like on LART 

  	  <http://www.lartmaker.nl/>.

  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_userspace.

  	  For details, take a look at <file:Documentation/cpu-freq/>.
  
  	  If in doubt, say Y.
  
  config CPU_FREQ_GOV_ONDEMAND
  	tristate "'ondemand' cpufreq policy governor"

  	select CPU_FREQ_GOV_COMMON

  	help
  	  'ondemand' - This driver adds a dynamic cpufreq policy governor.
  	  The governor does a periodic polling and 
  	  changes frequency based on the CPU utilization.
  	  The support for this governor depends on CPU capability to
  	  do fast frequency switching (i.e, very low latency frequency
  	  transitions). 

  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_ondemand.

  	  For details, take a look at linux/Documentation/cpu-freq.
  
  	  If in doubt, say N.

  config CPU_FREQ_GOV_CONSERVATIVE
  	tristate "'conservative' cpufreq governor"
  	depends on CPU_FREQ

  	select CPU_FREQ_GOV_COMMON

  	help
  	  'conservative' - this driver is rather similar to the 'ondemand'
  	  governor both in its source code and its purpose, the difference is
  	  its optimisation for better suitability in a battery powered
  	  environment.  The frequency is gracefully increased and decreased
  	  rather than jumping to 100% when speed is required.
  
  	  If you have a desktop machine then you should really be considering
  	  the 'ondemand' governor instead, however if you are using a laptop,
  	  PDA or even an AMD64 based computer (due to the unacceptable
  	  step-by-step latency issues between the minimum and maximum frequency
  	  transitions in the CPU) you will probably want to use this governor.

  	  To compile this driver as a module, choose M here: the
  	  module will be called cpufreq_conservative.

  	  For details, take a look at linux/Documentation/cpu-freq.
  
  	  If in doubt, say N.

  comment "CPU frequency scaling drivers"

  config CPUFREQ_DT
  	tristate "Generic DT based cpufreq driver"

  	depends on HAVE_CLK && OF

  	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:

  	depends on !CPU_THERMAL || THERMAL

  	select PM_OPP

  	help

  	  This adds a generic DT based cpufreq driver for frequency management.

  	  It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
  	  systems which share clock and voltage across all CPUs.
  
  	  If in doubt, say N.

  if X86

  source "drivers/cpufreq/Kconfig.x86"

  endif

  if ARM || ARM64

  source "drivers/cpufreq/Kconfig.arm"

  endif

  if PPC32 || PPC64
  source "drivers/cpufreq/Kconfig.powerpc"
  endif

  if AVR32

  config AVR32_AT32AP_CPUFREQ
  	bool "CPU frequency driver for AT32AP"
  	depends on PLATFORM_AT32AP
  	default n
  	help
  	  This enables the CPU frequency driver for AT32AP processors.
  	  If in doubt, say N.

  endif

  if IA64

  config IA64_ACPI_CPUFREQ
  	tristate "ACPI Processor P-States driver"

  	depends on ACPI_PROCESSOR
  	help
  	This driver adds a CPUFreq driver which utilizes the ACPI
  	Processor Performance States.
  
  	For details, take a look at <file:Documentation/cpu-freq/>.
  
  	If in doubt, say N.

  endif

  if MIPS

  config LOONGSON2_CPUFREQ
  	tristate "Loongson2 CPUFreq Driver"

  	help
  	  This option adds a CPUFreq driver for loongson processors which
  	  support software configurable cpu frequency.
  
  	  Loongson2F and it's successors support this feature.
  
  	  For details, take a look at <file:Documentation/cpu-freq/>.
  
  	  If in doubt, say N.

  config LOONGSON1_CPUFREQ
  	tristate "Loongson1 CPUFreq Driver"
  	help
  	  This option adds a CPUFreq driver for loongson1 processors which
  	  support software configurable cpu frequency.
  
  	  For details, take a look at <file:Documentation/cpu-freq/>.
  
  	  If in doubt, say N.

  endif

  if SPARC64

  config SPARC_US3_CPUFREQ
  	tristate "UltraSPARC-III CPU Frequency driver"

  	help
  	  This adds the CPUFreq driver for UltraSPARC-III processors.
  
  	  For details, take a look at <file:Documentation/cpu-freq>.
  
  	  If in doubt, say N.
  
  config SPARC_US2E_CPUFREQ
  	tristate "UltraSPARC-IIe CPU Frequency driver"

  	help
  	  This adds the CPUFreq driver for UltraSPARC-IIe processors.
  
  	  For details, take a look at <file:Documentation/cpu-freq>.
  
  	  If in doubt, say N.

  endif

  if SUPERH

  config SH_CPU_FREQ
  	tristate "SuperH CPU Frequency driver"

  	help
  	  This adds the cpufreq driver for SuperH. Any CPU that supports
  	  clock rate rounding through the clock framework can use this
  	  driver. While it will make the kernel slightly larger, this is
  	  harmless for CPUs that don't support rate rounding. The driver
  	  will also generate a notice in the boot log before disabling
  	  itself if the CPU in question is not capable of rate rounding.
  
  	  For details, take a look at <file:Documentation/cpu-freq>.
  
  	  If unsure, say N.

  endif

  config QORIQ_CPUFREQ
  	tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
  	depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
  	select CLK_QORIQ
  	help
  	  This adds the CPUFreq driver support for Freescale QorIQ SoCs
  	  which are capable of changing the CPU's frequency dynamically.

  endif
  endmenu