linux/drivers/cpufreq/Kconfig
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   1menu "CPU Frequency scaling"
   2
   3config CPU_FREQ
   4        bool "CPU Frequency scaling"
   5        help
   6          CPU Frequency scaling allows you to change the clock speed of 
   7          CPUs on the fly. This is a nice method to save power, because 
   8          the lower the CPU clock speed, the less power the CPU consumes.
   9
  10          Note that this driver doesn't automatically change the CPU
  11          clock speed, you need to either enable a dynamic cpufreq governor
  12          (see below) after boot, or use a userspace tool.
  13
  14          For details, take a look at <file:Documentation/cpu-freq>.
  15
  16          If in doubt, say N.
  17
  18if CPU_FREQ
  19
  20config CPU_FREQ_TABLE
  21        tristate
  22
  23config CPU_FREQ_GOV_COMMON
  24        bool
  25
  26config CPU_FREQ_STAT
  27        tristate "CPU frequency translation statistics"
  28        select CPU_FREQ_TABLE
  29        default y
  30        help
  31          This driver exports CPU frequency statistics information through sysfs
  32          file system.
  33
  34          To compile this driver as a module, choose M here: the
  35          module will be called cpufreq_stats.
  36
  37          If in doubt, say N.
  38
  39config CPU_FREQ_STAT_DETAILS
  40        bool "CPU frequency translation statistics details"
  41        depends on CPU_FREQ_STAT
  42        help
  43          This will show detail CPU frequency translation table in sysfs file
  44          system.
  45
  46          If in doubt, say N.
  47
  48choice
  49        prompt "Default CPUFreq governor"
  50        default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
  51        default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  52        help
  53          This option sets which CPUFreq governor shall be loaded at
  54          startup. If in doubt, select 'performance'.
  55
  56config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
  57        bool "performance"
  58        select CPU_FREQ_GOV_PERFORMANCE
  59        help
  60          Use the CPUFreq governor 'performance' as default. This sets
  61          the frequency statically to the highest frequency supported by
  62          the CPU.
  63
  64config CPU_FREQ_DEFAULT_GOV_POWERSAVE
  65        bool "powersave"
  66        depends on EXPERT
  67        select CPU_FREQ_GOV_POWERSAVE
  68        help
  69          Use the CPUFreq governor 'powersave' as default. This sets
  70          the frequency statically to the lowest frequency supported by
  71          the CPU.
  72
  73config CPU_FREQ_DEFAULT_GOV_USERSPACE
  74        bool "userspace"
  75        select CPU_FREQ_GOV_USERSPACE
  76        help
  77          Use the CPUFreq governor 'userspace' as default. This allows
  78          you to set the CPU frequency manually or when a userspace 
  79          program shall be able to set the CPU dynamically without having
  80          to enable the userspace governor manually.
  81
  82config CPU_FREQ_DEFAULT_GOV_ONDEMAND
  83        bool "ondemand"
  84        select CPU_FREQ_GOV_ONDEMAND
  85        select CPU_FREQ_GOV_PERFORMANCE
  86        help
  87          Use the CPUFreq governor 'ondemand' as default. This allows
  88          you to get a full dynamic frequency capable system by simply
  89          loading your cpufreq low-level hardware driver.
  90          Be aware that not all cpufreq drivers support the ondemand
  91          governor. If unsure have a look at the help section of the
  92          driver. Fallback governor will be the performance governor.
  93
  94config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
  95        bool "conservative"
  96        select CPU_FREQ_GOV_CONSERVATIVE
  97        select CPU_FREQ_GOV_PERFORMANCE
  98        help
  99          Use the CPUFreq governor 'conservative' as default. This allows
 100          you to get a full dynamic frequency capable system by simply
 101          loading your cpufreq low-level hardware driver.
 102          Be aware that not all cpufreq drivers support the conservative
 103          governor. If unsure have a look at the help section of the
 104          driver. Fallback governor will be the performance governor.
 105endchoice
 106
 107config CPU_FREQ_GOV_PERFORMANCE
 108        tristate "'performance' governor"
 109        help
 110          This cpufreq governor sets the frequency statically to the
 111          highest available CPU frequency.
 112
 113          To compile this driver as a module, choose M here: the
 114          module will be called cpufreq_performance.
 115
 116          If in doubt, say Y.
 117
 118config CPU_FREQ_GOV_POWERSAVE
 119        tristate "'powersave' governor"
 120        help
 121          This cpufreq governor sets the frequency statically to the
 122          lowest available CPU frequency.
 123
 124          To compile this driver as a module, choose M here: the
 125          module will be called cpufreq_powersave.
 126
 127          If in doubt, say Y.
 128
 129config CPU_FREQ_GOV_USERSPACE
 130        tristate "'userspace' governor for userspace frequency scaling"
 131        help
 132          Enable this cpufreq governor when you either want to set the
 133          CPU frequency manually or when a userspace program shall
 134          be able to set the CPU dynamically, like on LART 
 135          <http://www.lartmaker.nl/>.
 136
 137          To compile this driver as a module, choose M here: the
 138          module will be called cpufreq_userspace.
 139
 140          For details, take a look at <file:Documentation/cpu-freq/>.
 141
 142          If in doubt, say Y.
 143
 144config CPU_FREQ_GOV_ONDEMAND
 145        tristate "'ondemand' cpufreq policy governor"
 146        select CPU_FREQ_TABLE
 147        select CPU_FREQ_GOV_COMMON
 148        help
 149          'ondemand' - This driver adds a dynamic cpufreq policy governor.
 150          The governor does a periodic polling and 
 151          changes frequency based on the CPU utilization.
 152          The support for this governor depends on CPU capability to
 153          do fast frequency switching (i.e, very low latency frequency
 154          transitions). 
 155
 156          To compile this driver as a module, choose M here: the
 157          module will be called cpufreq_ondemand.
 158
 159          For details, take a look at linux/Documentation/cpu-freq.
 160
 161          If in doubt, say N.
 162
 163config CPU_FREQ_GOV_CONSERVATIVE
 164        tristate "'conservative' cpufreq governor"
 165        depends on CPU_FREQ
 166        select CPU_FREQ_GOV_COMMON
 167        help
 168          'conservative' - this driver is rather similar to the 'ondemand'
 169          governor both in its source code and its purpose, the difference is
 170          its optimisation for better suitability in a battery powered
 171          environment.  The frequency is gracefully increased and decreased
 172          rather than jumping to 100% when speed is required.
 173
 174          If you have a desktop machine then you should really be considering
 175          the 'ondemand' governor instead, however if you are using a laptop,
 176          PDA or even an AMD64 based computer (due to the unacceptable
 177          step-by-step latency issues between the minimum and maximum frequency
 178          transitions in the CPU) you will probably want to use this governor.
 179
 180          To compile this driver as a module, choose M here: the
 181          module will be called cpufreq_conservative.
 182
 183          For details, take a look at linux/Documentation/cpu-freq.
 184
 185          If in doubt, say N.
 186
 187config GENERIC_CPUFREQ_CPU0
 188        tristate "Generic CPU0 cpufreq driver"
 189        depends on HAVE_CLK && REGULATOR && PM_OPP && OF
 190        select CPU_FREQ_TABLE
 191        help
 192          This adds a generic cpufreq driver for CPU0 frequency management.
 193          It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
 194          systems which share clock and voltage across all CPUs.
 195
 196          If in doubt, say N.
 197
 198menu "x86 CPU frequency scaling drivers"
 199depends on X86
 200source "drivers/cpufreq/Kconfig.x86"
 201endmenu
 202
 203menu "ARM CPU frequency scaling drivers"
 204depends on ARM
 205source "drivers/cpufreq/Kconfig.arm"
 206endmenu
 207
 208menu "PowerPC CPU frequency scaling drivers"
 209depends on PPC32 || PPC64
 210source "drivers/cpufreq/Kconfig.powerpc"
 211endmenu
 212
 213endif
 214endmenu
 215
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