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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 CPUFREQ_DT
187         tristate "Generic DT based cpufreq driver"
188         depends on HAVE_CLK && OF
189         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
190         depends on !CPU_THERMAL || THERMAL
191         select PM_OPP
192         help
193           This adds a generic DT based cpufreq driver for 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

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