Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

Linux/drivers/cpufreq/Kconfig

  1 menu "CPU Frequency scaling"
  2 
  3 config CPU_FREQ
  4         bool "CPU Frequency scaling"
  5         select SRCU
  6         help
  7           CPU Frequency scaling allows you to change the clock speed of 
  8           CPUs on the fly. This is a nice method to save power, because 
  9           the lower the CPU clock speed, the less power the CPU consumes.
 10 
 11           Note that this driver doesn't automatically change the CPU
 12           clock speed, you need to either enable a dynamic cpufreq governor
 13           (see below) after boot, or use a userspace tool.
 14 
 15           For details, take a look at <file:Documentation/cpu-freq>.
 16 
 17           If in doubt, say N.
 18 
 19 if CPU_FREQ
 20 
 21 config CPU_FREQ_GOV_ATTR_SET
 22         bool
 23 
 24 config CPU_FREQ_GOV_COMMON
 25         select CPU_FREQ_GOV_ATTR_SET
 26         select IRQ_WORK
 27         bool
 28 
 29 config CPU_FREQ_BOOST_SW
 30         bool
 31         depends on THERMAL
 32 
 33 config CPU_FREQ_STAT
 34         tristate "CPU frequency translation statistics"
 35         default y
 36         help
 37           This driver exports CPU frequency statistics information through sysfs
 38           file system.
 39 
 40           To compile this driver as a module, choose M here: the
 41           module will be called cpufreq_stats.
 42 
 43           If in doubt, say N.
 44 
 45 config CPU_FREQ_STAT_DETAILS
 46         bool "CPU frequency translation statistics details"
 47         depends on CPU_FREQ_STAT
 48         help
 49           This will show detail CPU frequency translation table in sysfs file
 50           system.
 51 
 52           If in doubt, say N.
 53 
 54 choice
 55         prompt "Default CPUFreq governor"
 56         default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
 57         default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 58         help
 59           This option sets which CPUFreq governor shall be loaded at
 60           startup. If in doubt, select 'performance'.
 61 
 62 config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 63         bool "performance"
 64         select CPU_FREQ_GOV_PERFORMANCE
 65         help
 66           Use the CPUFreq governor 'performance' as default. This sets
 67           the frequency statically to the highest frequency supported by
 68           the CPU.
 69 
 70 config CPU_FREQ_DEFAULT_GOV_POWERSAVE
 71         bool "powersave"
 72         select CPU_FREQ_GOV_POWERSAVE
 73         help
 74           Use the CPUFreq governor 'powersave' as default. This sets
 75           the frequency statically to the lowest frequency supported by
 76           the CPU.
 77 
 78 config CPU_FREQ_DEFAULT_GOV_USERSPACE
 79         bool "userspace"
 80         select CPU_FREQ_GOV_USERSPACE
 81         help
 82           Use the CPUFreq governor 'userspace' as default. This allows
 83           you to set the CPU frequency manually or when a userspace 
 84           program shall be able to set the CPU dynamically without having
 85           to enable the userspace governor manually.
 86 
 87 config CPU_FREQ_DEFAULT_GOV_ONDEMAND
 88         bool "ondemand"
 89         select CPU_FREQ_GOV_ONDEMAND
 90         select CPU_FREQ_GOV_PERFORMANCE
 91         help
 92           Use the CPUFreq governor 'ondemand' as default. This allows
 93           you to get a full dynamic frequency capable system by simply
 94           loading your cpufreq low-level hardware driver.
 95           Be aware that not all cpufreq drivers support the ondemand
 96           governor. If unsure have a look at the help section of the
 97           driver. Fallback governor will be the performance governor.
 98 
 99 config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
100         bool "conservative"
101         select CPU_FREQ_GOV_CONSERVATIVE
102         select CPU_FREQ_GOV_PERFORMANCE
103         help
104           Use the CPUFreq governor 'conservative' as default. This allows
105           you to get a full dynamic frequency capable system by simply
106           loading your cpufreq low-level hardware driver.
107           Be aware that not all cpufreq drivers support the conservative
108           governor. If unsure have a look at the help section of the
109           driver. Fallback governor will be the performance governor.
110 
111 config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
112         bool "schedutil"
113         depends on SMP
114         select CPU_FREQ_GOV_SCHEDUTIL
115         select CPU_FREQ_GOV_PERFORMANCE
116         help
117           Use the 'schedutil' CPUFreq governor by default. If unsure,
118           have a look at the help section of that governor. The fallback
119           governor will be 'performance'.
120 
121 endchoice
122 
123 config CPU_FREQ_GOV_PERFORMANCE
124         tristate "'performance' governor"
125         help
126           This cpufreq governor sets the frequency statically to the
127           highest available CPU frequency.
128 
129           To compile this driver as a module, choose M here: the
130           module will be called cpufreq_performance.
131 
132           If in doubt, say Y.
133 
134 config CPU_FREQ_GOV_POWERSAVE
135         tristate "'powersave' governor"
136         help
137           This cpufreq governor sets the frequency statically to the
138           lowest available CPU frequency.
139 
140           To compile this driver as a module, choose M here: the
141           module will be called cpufreq_powersave.
142 
143           If in doubt, say Y.
144 
145 config CPU_FREQ_GOV_USERSPACE
146         tristate "'userspace' governor for userspace frequency scaling"
147         help
148           Enable this cpufreq governor when you either want to set the
149           CPU frequency manually or when a userspace program shall
150           be able to set the CPU dynamically, like on LART 
151           <http://www.lartmaker.nl/>.
152 
153           To compile this driver as a module, choose M here: the
154           module will be called cpufreq_userspace.
155 
156           For details, take a look at <file:Documentation/cpu-freq/>.
157 
158           If in doubt, say Y.
159 
160 config CPU_FREQ_GOV_ONDEMAND
161         tristate "'ondemand' cpufreq policy governor"
162         select CPU_FREQ_GOV_COMMON
163         help
164           'ondemand' - This driver adds a dynamic cpufreq policy governor.
165           The governor does a periodic polling and 
166           changes frequency based on the CPU utilization.
167           The support for this governor depends on CPU capability to
168           do fast frequency switching (i.e, very low latency frequency
169           transitions). 
170 
171           To compile this driver as a module, choose M here: the
172           module will be called cpufreq_ondemand.
173 
174           For details, take a look at linux/Documentation/cpu-freq.
175 
176           If in doubt, say N.
177 
178 config CPU_FREQ_GOV_CONSERVATIVE
179         tristate "'conservative' cpufreq governor"
180         depends on CPU_FREQ
181         select CPU_FREQ_GOV_COMMON
182         help
183           'conservative' - this driver is rather similar to the 'ondemand'
184           governor both in its source code and its purpose, the difference is
185           its optimisation for better suitability in a battery powered
186           environment.  The frequency is gracefully increased and decreased
187           rather than jumping to 100% when speed is required.
188 
189           If you have a desktop machine then you should really be considering
190           the 'ondemand' governor instead, however if you are using a laptop,
191           PDA or even an AMD64 based computer (due to the unacceptable
192           step-by-step latency issues between the minimum and maximum frequency
193           transitions in the CPU) you will probably want to use this governor.
194 
195           To compile this driver as a module, choose M here: the
196           module will be called cpufreq_conservative.
197 
198           For details, take a look at linux/Documentation/cpu-freq.
199 
200           If in doubt, say N.
201 
202 config CPU_FREQ_GOV_SCHEDUTIL
203         tristate "'schedutil' cpufreq policy governor"
204         depends on CPU_FREQ && SMP
205         select CPU_FREQ_GOV_ATTR_SET
206         select IRQ_WORK
207         help
208           This governor makes decisions based on the utilization data provided
209           by the scheduler.  It sets the CPU frequency to be proportional to
210           the utilization/capacity ratio coming from the scheduler.  If the
211           utilization is frequency-invariant, the new frequency is also
212           proportional to the maximum available frequency.  If that is not the
213           case, it is proportional to the current frequency of the CPU.  The
214           frequency tipping point is at utilization/capacity equal to 80% in
215           both cases.
216 
217           To compile this driver as a module, choose M here: the module will
218           be called cpufreq_schedutil.
219 
220           If in doubt, say N.
221 
222 comment "CPU frequency scaling drivers"
223 
224 config CPUFREQ_DT
225         tristate "Generic DT based cpufreq driver"
226         depends on HAVE_CLK && OF
227         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
228         depends on !CPU_THERMAL || THERMAL
229         select CPUFREQ_DT_PLATDEV
230         select PM_OPP
231         help
232           This adds a generic DT based cpufreq driver for frequency management.
233           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
234           systems which share clock and voltage across all CPUs.
235 
236           If in doubt, say N.
237 
238 config CPUFREQ_DT_PLATDEV
239         bool
240         help
241           This adds a generic DT based cpufreq platdev driver for frequency
242           management.  This creates a 'cpufreq-dt' platform device, on the
243           supported platforms.
244 
245           If in doubt, say N.
246 
247 if X86
248 source "drivers/cpufreq/Kconfig.x86"
249 endif
250 
251 if ARM || ARM64
252 source "drivers/cpufreq/Kconfig.arm"
253 endif
254 
255 if PPC32 || PPC64
256 source "drivers/cpufreq/Kconfig.powerpc"
257 endif
258 
259 if AVR32
260 config AVR32_AT32AP_CPUFREQ
261         bool "CPU frequency driver for AT32AP"
262         depends on PLATFORM_AT32AP
263         default n
264         help
265           This enables the CPU frequency driver for AT32AP processors.
266           If in doubt, say N.
267 endif
268 
269 if IA64
270 config IA64_ACPI_CPUFREQ
271         tristate "ACPI Processor P-States driver"
272         depends on ACPI_PROCESSOR
273         help
274         This driver adds a CPUFreq driver which utilizes the ACPI
275         Processor Performance States.
276 
277         For details, take a look at <file:Documentation/cpu-freq/>.
278 
279         If in doubt, say N.
280 endif
281 
282 if MIPS
283 config LOONGSON2_CPUFREQ
284         tristate "Loongson2 CPUFreq Driver"
285         help
286           This option adds a CPUFreq driver for loongson processors which
287           support software configurable cpu frequency.
288 
289           Loongson2F and it's successors support this feature.
290 
291           For details, take a look at <file:Documentation/cpu-freq/>.
292 
293           If in doubt, say N.
294 
295 config LOONGSON1_CPUFREQ
296         tristate "Loongson1 CPUFreq Driver"
297         help
298           This option adds a CPUFreq driver for loongson1 processors which
299           support software configurable cpu frequency.
300 
301           For details, take a look at <file:Documentation/cpu-freq/>.
302 
303           If in doubt, say N.
304 endif
305 
306 if SPARC64
307 config SPARC_US3_CPUFREQ
308         tristate "UltraSPARC-III CPU Frequency driver"
309         help
310           This adds the CPUFreq driver for UltraSPARC-III processors.
311 
312           For details, take a look at <file:Documentation/cpu-freq>.
313 
314           If in doubt, say N.
315 
316 config SPARC_US2E_CPUFREQ
317         tristate "UltraSPARC-IIe CPU Frequency driver"
318         help
319           This adds the CPUFreq driver for UltraSPARC-IIe processors.
320 
321           For details, take a look at <file:Documentation/cpu-freq>.
322 
323           If in doubt, say N.
324 endif
325 
326 if SUPERH
327 config SH_CPU_FREQ
328         tristate "SuperH CPU Frequency driver"
329         help
330           This adds the cpufreq driver for SuperH. Any CPU that supports
331           clock rate rounding through the clock framework can use this
332           driver. While it will make the kernel slightly larger, this is
333           harmless for CPUs that don't support rate rounding. The driver
334           will also generate a notice in the boot log before disabling
335           itself if the CPU in question is not capable of rate rounding.
336 
337           For details, take a look at <file:Documentation/cpu-freq>.
338 
339           If unsure, say N.
340 endif
341 
342 config QORIQ_CPUFREQ
343         tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
344         depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
345         depends on !CPU_THERMAL || THERMAL
346         select CLK_QORIQ
347         help
348           This adds the CPUFreq driver support for Freescale QorIQ SoCs
349           which are capable of changing the CPU's frequency dynamically.
350 
351 endif
352 endmenu

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us