drivers/cpufreq/Kconfig

   1 menu "CPU Frequency scaling"
   2
   3 config 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
  18 if CPU_FREQ
  19
  20 config CPU_FREQ_GOV_COMMON
  21         bool
  22
  23 config CPU_FREQ_BOOST_SW
  24         bool
  25         depends on THERMAL
  26
  27 config CPU_FREQ_STAT
  28         tristate "CPU frequency translation statistics"
  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
  39 config 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
  48 choice
  49         prompt "Default CPUFreq governor"
  50         default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
  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
  56 config 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
  64 config 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
  73 config 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
  82 config 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
  94 config 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.
 105 endchoice
 106
 107 config 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
 118 config 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
 129 config 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
 144 config CPU_FREQ_GOV_ONDEMAND
 145         tristate "'ondemand' cpufreq policy governor"
 146         select CPU_FREQ_GOV_COMMON
 147         help
 148           'ondemand' - This driver adds a dynamic cpufreq policy governor.
 149           The governor does a periodic polling and
 150           changes frequency based on the CPU utilization.
 151           The support for this governor depends on CPU capability to
 152           do fast frequency switching (i.e, very low latency frequency
 153           transitions).
 154
 155           To compile this driver as a module, choose M here: the
 156           module will be called cpufreq_ondemand.
 157
 158           For details, take a look at linux/Documentation/cpu-freq.
 159
 160           If in doubt, say N.
 161
 162 config CPU_FREQ_GOV_CONSERVATIVE
 163         tristate "'conservative' cpufreq governor"
 164         depends on CPU_FREQ
 165         select CPU_FREQ_GOV_COMMON
 166         help
 167           'conservative' - this driver is rather similar to the 'ondemand'
 168           governor both in its source code and its purpose, the difference is
 169           its optimisation for better suitability in a battery powered
 170           environment.  The frequency is gracefully increased and decreased
 171           rather than jumping to 100% when speed is required.
 172
 173           If you have a desktop machine then you should really be considering
 174           the 'ondemand' governor instead, however if you are using a laptop,
 175           PDA or even an AMD64 based computer (due to the unacceptable
 176           step-by-step latency issues between the minimum and maximum frequency
 177           transitions in the CPU) you will probably want to use this governor.
 178
 179           To compile this driver as a module, choose M here: the
 180           module will be called cpufreq_conservative.
 181
 182           For details, take a look at linux/Documentation/cpu-freq.
 183
 184           If in doubt, say N.
 185
 186 config GENERIC_CPUFREQ_CPU0
 187         tristate "Generic CPU0 cpufreq driver"
 188         depends on HAVE_CLK && OF
 189         # if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
 190         depends on !CPU_THERMAL || THERMAL
 191         select PM_OPP
 192         help
 193           This adds a generic cpufreq driver for CPU0 frequency management.
 194           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
 195           systems which share clock and voltage across all CPUs.
 196
 197           If in doubt, say N.
 198
 199 menu "x86 CPU frequency scaling drivers"
 200 depends on X86
 201 source "drivers/cpufreq/Kconfig.x86"
 202 endmenu
 203
 204 menu "ARM CPU frequency scaling drivers"
 205 depends on ARM || ARM64
 206 source "drivers/cpufreq/Kconfig.arm"
 207 endmenu
 208
 209 menu "AVR32 CPU frequency scaling drivers"
 210 depends on AVR32
 211
 212 config AVR32_AT32AP_CPUFREQ
 213         bool "CPU frequency driver for AT32AP"
 214         depends on PLATFORM_AT32AP
 215         default n
 216         help
 217           This enables the CPU frequency driver for AT32AP processors.
 218           If in doubt, say N.
 219
 220 endmenu
 221
 222 menu "CPUFreq processor drivers"
 223 depends on IA64
 224
 225 config IA64_ACPI_CPUFREQ
 226         tristate "ACPI Processor P-States driver"
 227         depends on ACPI_PROCESSOR
 228         help
 229         This driver adds a CPUFreq driver which utilizes the ACPI
 230         Processor Performance States.
 231
 232         For details, take a look at <file:Documentation/cpu-freq/>.
 233
 234         If in doubt, say N.
 235
 236 endmenu
 237
 238 menu "MIPS CPUFreq processor drivers"
 239 depends on MIPS
 240
 241 config LOONGSON2_CPUFREQ
 242         tristate "Loongson2 CPUFreq Driver"
 243         help
 244           This option adds a CPUFreq driver for loongson processors which
 245           support software configurable cpu frequency.
 246
 247           Loongson2F and it's successors support this feature.
 248
 249           For details, take a look at <file:Documentation/cpu-freq/>.
 250
 251           If in doubt, say N.
 252
 253 endmenu
 254
 255 menu "PowerPC CPU frequency scaling drivers"
 256 depends on PPC32 || PPC64
 257 source "drivers/cpufreq/Kconfig.powerpc"
 258 endmenu
 259
 260 menu "SPARC CPU frequency scaling drivers"
 261 depends on SPARC64
 262 config SPARC_US3_CPUFREQ
 263         tristate "UltraSPARC-III CPU Frequency driver"
 264         help
 265           This adds the CPUFreq driver for UltraSPARC-III processors.
 266
 267           For details, take a look at <file:Documentation/cpu-freq>.
 268
 269           If in doubt, say N.
 270
 271 config SPARC_US2E_CPUFREQ
 272         tristate "UltraSPARC-IIe CPU Frequency driver"
 273         help
 274           This adds the CPUFreq driver for UltraSPARC-IIe processors.
 275
 276           For details, take a look at <file:Documentation/cpu-freq>.
 277
 278           If in doubt, say N.
 279 endmenu
 280
 281 menu "SH CPU Frequency scaling"
 282 depends on SUPERH
 283 config SH_CPU_FREQ
 284         tristate "SuperH CPU Frequency driver"
 285         help
 286           This adds the cpufreq driver for SuperH. Any CPU that supports
 287           clock rate rounding through the clock framework can use this
 288           driver. While it will make the kernel slightly larger, this is
 289           harmless for CPUs that don't support rate rounding. The driver
 290           will also generate a notice in the boot log before disabling
 291           itself if the CPU in question is not capable of rate rounding.
 292
 293           For details, take a look at <file:Documentation/cpu-freq>.
 294
 295           If unsure, say N.
 296 endmenu
 297
 298 endif
 299 endmenu