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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         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 && REGULATOR && OF && THERMAL && CPU_THERMAL
189         select PM_OPP
190         help
191           This adds a generic cpufreq driver for CPU0 frequency management.
192           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
193           systems which share clock and voltage across all CPUs.
194 
195           If in doubt, say N.
196 
197 menu "x86 CPU frequency scaling drivers"
198 depends on X86
199 source "drivers/cpufreq/Kconfig.x86"
200 endmenu
201 
202 menu "ARM CPU frequency scaling drivers"
203 depends on ARM || ARM64
204 source "drivers/cpufreq/Kconfig.arm"
205 endmenu
206 
207 menu "AVR32 CPU frequency scaling drivers"
208 depends on AVR32
209 
210 config AVR32_AT32AP_CPUFREQ
211         bool "CPU frequency driver for AT32AP"
212         depends on PLATFORM_AT32AP
213         default n
214         help
215           This enables the CPU frequency driver for AT32AP processors.
216           If in doubt, say N.
217 
218 endmenu
219 
220 menu "CPUFreq processor drivers"
221 depends on IA64
222 
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 
234 endmenu
235 
236 menu "MIPS CPUFreq processor drivers"
237 depends on MIPS
238 
239 config LOONGSON2_CPUFREQ
240         tristate "Loongson2 CPUFreq Driver"
241         help
242           This option adds a CPUFreq driver for loongson processors which
243           support software configurable cpu frequency.
244 
245           Loongson2F and it's successors support this feature.
246 
247           For details, take a look at <file:Documentation/cpu-freq/>.
248 
249           If in doubt, say N.
250 
251 endmenu
252 
253 menu "PowerPC CPU frequency scaling drivers"
254 depends on PPC32 || PPC64
255 source "drivers/cpufreq/Kconfig.powerpc"
256 endmenu
257 
258 menu "SPARC CPU frequency scaling drivers"
259 depends on 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 endmenu
278 
279 menu "SH CPU Frequency scaling"
280 depends on SUPERH
281 config SH_CPU_FREQ
282         tristate "SuperH CPU Frequency driver"
283         help
284           This adds the cpufreq driver for SuperH. Any CPU that supports
285           clock rate rounding through the clock framework can use this
286           driver. While it will make the kernel slightly larger, this is
287           harmless for CPUs that don't support rate rounding. The driver
288           will also generate a notice in the boot log before disabling
289           itself if the CPU in question is not capable of rate rounding.
290 
291           For details, take a look at <file:Documentation/cpu-freq>.
292 
293           If unsure, say N.
294 endmenu
295 
296 endif
297 endmenu

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