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Linux/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         select CPU_FREQ_GOV_POWERSAVE
 67         help
 68           Use the CPUFreq governor 'powersave' as default. This sets
 69           the frequency statically to the lowest frequency supported by
 70           the CPU.
 71 
 72 config CPU_FREQ_DEFAULT_GOV_USERSPACE
 73         bool "userspace"
 74         select CPU_FREQ_GOV_USERSPACE
 75         help
 76           Use the CPUFreq governor 'userspace' as default. This allows
 77           you to set the CPU frequency manually or when a userspace 
 78           program shall be able to set the CPU dynamically without having
 79           to enable the userspace governor manually.
 80 
 81 config CPU_FREQ_DEFAULT_GOV_ONDEMAND
 82         bool "ondemand"
 83         select CPU_FREQ_GOV_ONDEMAND
 84         select CPU_FREQ_GOV_PERFORMANCE
 85         help
 86           Use the CPUFreq governor 'ondemand' as default. This allows
 87           you to get a full dynamic frequency capable system by simply
 88           loading your cpufreq low-level hardware driver.
 89           Be aware that not all cpufreq drivers support the ondemand
 90           governor. If unsure have a look at the help section of the
 91           driver. Fallback governor will be the performance governor.
 92 
 93 config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
 94         bool "conservative"
 95         select CPU_FREQ_GOV_CONSERVATIVE
 96         select CPU_FREQ_GOV_PERFORMANCE
 97         help
 98           Use the CPUFreq governor 'conservative' as default. This allows
 99           you to get a full dynamic frequency capable system by simply
100           loading your cpufreq low-level hardware driver.
101           Be aware that not all cpufreq drivers support the conservative
102           governor. If unsure have a look at the help section of the
103           driver. Fallback governor will be the performance governor.
104 endchoice
105 
106 config CPU_FREQ_GOV_PERFORMANCE
107         tristate "'performance' governor"
108         help
109           This cpufreq governor sets the frequency statically to the
110           highest available CPU frequency.
111 
112           To compile this driver as a module, choose M here: the
113           module will be called cpufreq_performance.
114 
115           If in doubt, say Y.
116 
117 config CPU_FREQ_GOV_POWERSAVE
118         tristate "'powersave' governor"
119         help
120           This cpufreq governor sets the frequency statically to the
121           lowest available CPU frequency.
122 
123           To compile this driver as a module, choose M here: the
124           module will be called cpufreq_powersave.
125 
126           If in doubt, say Y.
127 
128 config CPU_FREQ_GOV_USERSPACE
129         tristate "'userspace' governor for userspace frequency scaling"
130         help
131           Enable this cpufreq governor when you either want to set the
132           CPU frequency manually or when a userspace program shall
133           be able to set the CPU dynamically, like on LART 
134           <http://www.lartmaker.nl/>.
135 
136           To compile this driver as a module, choose M here: the
137           module will be called cpufreq_userspace.
138 
139           For details, take a look at <file:Documentation/cpu-freq/>.
140 
141           If in doubt, say Y.
142 
143 config CPU_FREQ_GOV_ONDEMAND
144         tristate "'ondemand' cpufreq policy governor"
145         select CPU_FREQ_GOV_COMMON
146         help
147           'ondemand' - This driver adds a dynamic cpufreq policy governor.
148           The governor does a periodic polling and 
149           changes frequency based on the CPU utilization.
150           The support for this governor depends on CPU capability to
151           do fast frequency switching (i.e, very low latency frequency
152           transitions). 
153 
154           To compile this driver as a module, choose M here: the
155           module will be called cpufreq_ondemand.
156 
157           For details, take a look at linux/Documentation/cpu-freq.
158 
159           If in doubt, say N.
160 
161 config CPU_FREQ_GOV_CONSERVATIVE
162         tristate "'conservative' cpufreq governor"
163         depends on CPU_FREQ
164         select CPU_FREQ_GOV_COMMON
165         help
166           'conservative' - this driver is rather similar to the 'ondemand'
167           governor both in its source code and its purpose, the difference is
168           its optimisation for better suitability in a battery powered
169           environment.  The frequency is gracefully increased and decreased
170           rather than jumping to 100% when speed is required.
171 
172           If you have a desktop machine then you should really be considering
173           the 'ondemand' governor instead, however if you are using a laptop,
174           PDA or even an AMD64 based computer (due to the unacceptable
175           step-by-step latency issues between the minimum and maximum frequency
176           transitions in the CPU) you will probably want to use this governor.
177 
178           To compile this driver as a module, choose M here: the
179           module will be called cpufreq_conservative.
180 
181           For details, take a look at linux/Documentation/cpu-freq.
182 
183           If in doubt, say N.
184 
185 comment "CPU frequency scaling drivers"
186 
187 config CPUFREQ_DT
188         tristate "Generic DT based cpufreq driver"
189         depends on HAVE_CLK && OF
190         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
191         depends on !CPU_THERMAL || THERMAL
192         select PM_OPP
193         help
194           This adds a generic DT based cpufreq driver for frequency management.
195           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
196           systems which share clock and voltage across all CPUs.
197 
198           If in doubt, say N.
199 
200 if X86
201 source "drivers/cpufreq/Kconfig.x86"
202 endif
203 
204 if ARM || ARM64
205 source "drivers/cpufreq/Kconfig.arm"
206 endif
207 
208 if PPC32 || PPC64
209 source "drivers/cpufreq/Kconfig.powerpc"
210 endif
211 
212 if AVR32
213 config AVR32_AT32AP_CPUFREQ
214         bool "CPU frequency driver for AT32AP"
215         depends on PLATFORM_AT32AP
216         default n
217         help
218           This enables the CPU frequency driver for AT32AP processors.
219           If in doubt, say N.
220 endif
221 
222 if IA64
223 config IA64_ACPI_CPUFREQ
224         tristate "ACPI Processor P-States driver"
225         depends on ACPI_PROCESSOR
226         help
227         This driver adds a CPUFreq driver which utilizes the ACPI
228         Processor Performance States.
229 
230         For details, take a look at <file:Documentation/cpu-freq/>.
231 
232         If in doubt, say N.
233 endif
234 
235 if MIPS
236 config LOONGSON2_CPUFREQ
237         tristate "Loongson2 CPUFreq Driver"
238         help
239           This option adds a CPUFreq driver for loongson processors which
240           support software configurable cpu frequency.
241 
242           Loongson2F and it's successors support this feature.
243 
244           For details, take a look at <file:Documentation/cpu-freq/>.
245 
246           If in doubt, say N.
247 
248 config LOONGSON1_CPUFREQ
249         tristate "Loongson1 CPUFreq Driver"
250         help
251           This option adds a CPUFreq driver for loongson1 processors which
252           support software configurable cpu frequency.
253 
254           For details, take a look at <file:Documentation/cpu-freq/>.
255 
256           If in doubt, say N.
257 endif
258 
259 if SPARC64
260 config SPARC_US3_CPUFREQ
261         tristate "UltraSPARC-III CPU Frequency driver"
262         help
263           This adds the CPUFreq driver for UltraSPARC-III processors.
264 
265           For details, take a look at <file:Documentation/cpu-freq>.
266 
267           If in doubt, say N.
268 
269 config SPARC_US2E_CPUFREQ
270         tristate "UltraSPARC-IIe CPU Frequency driver"
271         help
272           This adds the CPUFreq driver for UltraSPARC-IIe processors.
273 
274           For details, take a look at <file:Documentation/cpu-freq>.
275 
276           If in doubt, say N.
277 endif
278 
279 if SUPERH
280 config SH_CPU_FREQ
281         tristate "SuperH CPU Frequency driver"
282         help
283           This adds the cpufreq driver for SuperH. Any CPU that supports
284           clock rate rounding through the clock framework can use this
285           driver. While it will make the kernel slightly larger, this is
286           harmless for CPUs that don't support rate rounding. The driver
287           will also generate a notice in the boot log before disabling
288           itself if the CPU in question is not capable of rate rounding.
289 
290           For details, take a look at <file:Documentation/cpu-freq>.
291 
292           If unsure, say N.
293 endif
294 
295 endif
296 endmenu

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