menu "CPU Frequency scaling"

  config CPU_FREQ
  	bool "CPU Frequency scaling"
  	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_TABLE

  	tristate

  config CPU_FREQ_STAT

  	tristate "CPU frequency translation statistics"
  	select CPU_FREQ_TABLE
  	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 CPU_FREQ_SA1100 || CPU_FREQ_SA1110
  	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"

  	depends on EXPERT

  	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_TABLE

  	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
  	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.

  menu "x86 CPU frequency scaling drivers"
  depends on X86
  source "drivers/cpufreq/Kconfig.x86"
  endmenu

  menu "ARM CPU frequency scaling drivers"
  depends on ARM
  source "drivers/cpufreq/Kconfig.arm"
  endmenu

  menu "PowerPC CPU frequency scaling drivers"
  depends on PPC32 || PPC64
  source "drivers/cpufreq/Kconfig.powerpc"
  endmenu

  endif
  endmenu