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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         bool "CPU frequency transition statistics"
 35         help
 36           Export CPU frequency statistics information through sysfs.
 37 
 38           If in doubt, say N.
 39 
 40 config CPU_FREQ_STAT_DETAILS
 41         bool "CPU frequency transition statistics details"
 42         depends on CPU_FREQ_STAT
 43         help
 44           Show detailed CPU frequency transition table in sysfs.
 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 
105 config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
106         bool "schedutil"
107         depends on SMP
108         select CPU_FREQ_GOV_SCHEDUTIL
109         select CPU_FREQ_GOV_PERFORMANCE
110         help
111           Use the 'schedutil' CPUFreq governor by default. If unsure,
112           have a look at the help section of that governor. The fallback
113           governor will be 'performance'.
114 
115 endchoice
116 
117 config CPU_FREQ_GOV_PERFORMANCE
118         tristate "'performance' governor"
119         help
120           This cpufreq governor sets the frequency statically to the
121           highest available CPU frequency.
122 
123           To compile this driver as a module, choose M here: the
124           module will be called cpufreq_performance.
125 
126           If in doubt, say Y.
127 
128 config CPU_FREQ_GOV_POWERSAVE
129         tristate "'powersave' governor"
130         help
131           This cpufreq governor sets the frequency statically to the
132           lowest available CPU frequency.
133 
134           To compile this driver as a module, choose M here: the
135           module will be called cpufreq_powersave.
136 
137           If in doubt, say Y.
138 
139 config CPU_FREQ_GOV_USERSPACE
140         tristate "'userspace' governor for userspace frequency scaling"
141         help
142           Enable this cpufreq governor when you either want to set the
143           CPU frequency manually or when a userspace program shall
144           be able to set the CPU dynamically, like on LART 
145           <http://www.lartmaker.nl/>.
146 
147           To compile this driver as a module, choose M here: the
148           module will be called cpufreq_userspace.
149 
150           For details, take a look at <file:Documentation/cpu-freq/>.
151 
152           If in doubt, say Y.
153 
154 config CPU_FREQ_GOV_ONDEMAND
155         tristate "'ondemand' cpufreq policy governor"
156         select CPU_FREQ_GOV_COMMON
157         help
158           'ondemand' - This driver adds a dynamic cpufreq policy governor.
159           The governor does a periodic polling and 
160           changes frequency based on the CPU utilization.
161           The support for this governor depends on CPU capability to
162           do fast frequency switching (i.e, very low latency frequency
163           transitions). 
164 
165           To compile this driver as a module, choose M here: the
166           module will be called cpufreq_ondemand.
167 
168           For details, take a look at linux/Documentation/cpu-freq.
169 
170           If in doubt, say N.
171 
172 config CPU_FREQ_GOV_CONSERVATIVE
173         tristate "'conservative' cpufreq governor"
174         depends on CPU_FREQ
175         select CPU_FREQ_GOV_COMMON
176         help
177           'conservative' - this driver is rather similar to the 'ondemand'
178           governor both in its source code and its purpose, the difference is
179           its optimisation for better suitability in a battery powered
180           environment.  The frequency is gracefully increased and decreased
181           rather than jumping to 100% when speed is required.
182 
183           If you have a desktop machine then you should really be considering
184           the 'ondemand' governor instead, however if you are using a laptop,
185           PDA or even an AMD64 based computer (due to the unacceptable
186           step-by-step latency issues between the minimum and maximum frequency
187           transitions in the CPU) you will probably want to use this governor.
188 
189           To compile this driver as a module, choose M here: the
190           module will be called cpufreq_conservative.
191 
192           For details, take a look at linux/Documentation/cpu-freq.
193 
194           If in doubt, say N.
195 
196 config CPU_FREQ_GOV_SCHEDUTIL
197         tristate "'schedutil' cpufreq policy governor"
198         depends on CPU_FREQ && SMP
199         select CPU_FREQ_GOV_ATTR_SET
200         select IRQ_WORK
201         help
202           This governor makes decisions based on the utilization data provided
203           by the scheduler.  It sets the CPU frequency to be proportional to
204           the utilization/capacity ratio coming from the scheduler.  If the
205           utilization is frequency-invariant, the new frequency is also
206           proportional to the maximum available frequency.  If that is not the
207           case, it is proportional to the current frequency of the CPU.  The
208           frequency tipping point is at utilization/capacity equal to 80% in
209           both cases.
210 
211           To compile this driver as a module, choose M here: the module will
212           be called cpufreq_schedutil.
213 
214           If in doubt, say N.
215 
216 comment "CPU frequency scaling drivers"
217 
218 config CPUFREQ_DT
219         tristate "Generic DT based cpufreq driver"
220         depends on HAVE_CLK && OF
221         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
222         depends on !CPU_THERMAL || THERMAL
223         select CPUFREQ_DT_PLATDEV
224         select PM_OPP
225         help
226           This adds a generic DT based cpufreq driver for frequency management.
227           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
228           systems which share clock and voltage across all CPUs.
229 
230           If in doubt, say N.
231 
232 config CPUFREQ_DT_PLATDEV
233         bool
234         help
235           This adds a generic DT based cpufreq platdev driver for frequency
236           management.  This creates a 'cpufreq-dt' platform device, on the
237           supported platforms.
238 
239           If in doubt, say N.
240 
241 if X86
242 source "drivers/cpufreq/Kconfig.x86"
243 endif
244 
245 if ARM || ARM64
246 source "drivers/cpufreq/Kconfig.arm"
247 endif
248 
249 if PPC32 || PPC64
250 source "drivers/cpufreq/Kconfig.powerpc"
251 endif
252 
253 if AVR32
254 config AVR32_AT32AP_CPUFREQ
255         bool "CPU frequency driver for AT32AP"
256         depends on PLATFORM_AT32AP
257         default n
258         help
259           This enables the CPU frequency driver for AT32AP processors.
260           If in doubt, say N.
261 endif
262 
263 if IA64
264 config IA64_ACPI_CPUFREQ
265         tristate "ACPI Processor P-States driver"
266         depends on ACPI_PROCESSOR
267         help
268         This driver adds a CPUFreq driver which utilizes the ACPI
269         Processor Performance States.
270 
271         For details, take a look at <file:Documentation/cpu-freq/>.
272 
273         If in doubt, say N.
274 endif
275 
276 if MIPS
277 config LOONGSON2_CPUFREQ
278         tristate "Loongson2 CPUFreq Driver"
279         help
280           This option adds a CPUFreq driver for loongson processors which
281           support software configurable cpu frequency.
282 
283           Loongson2F and it's successors support this feature.
284 
285           For details, take a look at <file:Documentation/cpu-freq/>.
286 
287           If in doubt, say N.
288 
289 config LOONGSON1_CPUFREQ
290         tristate "Loongson1 CPUFreq Driver"
291         help
292           This option adds a CPUFreq driver for loongson1 processors which
293           support software configurable cpu frequency.
294 
295           For details, take a look at <file:Documentation/cpu-freq/>.
296 
297           If in doubt, say N.
298 endif
299 
300 if SPARC64
301 config SPARC_US3_CPUFREQ
302         tristate "UltraSPARC-III CPU Frequency driver"
303         help
304           This adds the CPUFreq driver for UltraSPARC-III processors.
305 
306           For details, take a look at <file:Documentation/cpu-freq>.
307 
308           If in doubt, say N.
309 
310 config SPARC_US2E_CPUFREQ
311         tristate "UltraSPARC-IIe CPU Frequency driver"
312         help
313           This adds the CPUFreq driver for UltraSPARC-IIe processors.
314 
315           For details, take a look at <file:Documentation/cpu-freq>.
316 
317           If in doubt, say N.
318 endif
319 
320 if SUPERH
321 config SH_CPU_FREQ
322         tristate "SuperH CPU Frequency driver"
323         help
324           This adds the cpufreq driver for SuperH. Any CPU that supports
325           clock rate rounding through the clock framework can use this
326           driver. While it will make the kernel slightly larger, this is
327           harmless for CPUs that don't support rate rounding. The driver
328           will also generate a notice in the boot log before disabling
329           itself if the CPU in question is not capable of rate rounding.
330 
331           For details, take a look at <file:Documentation/cpu-freq>.
332 
333           If unsure, say N.
334 endif
335 
336 config QORIQ_CPUFREQ
337         tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
338         depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
339         depends on !CPU_THERMAL || THERMAL
340         select CLK_QORIQ
341         help
342           This adds the CPUFreq driver support for Freescale QorIQ SoCs
343           which are capable of changing the CPU's frequency dynamically.
344 
345 endif
346 endmenu

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