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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_COMMON
 22         bool
 23 
 24 config CPU_FREQ_BOOST_SW
 25         bool
 26         depends on THERMAL
 27 
 28 config CPU_FREQ_STAT
 29         tristate "CPU frequency translation statistics"
 30         default y
 31         help
 32           This driver exports CPU frequency statistics information through sysfs
 33           file system.
 34 
 35           To compile this driver as a module, choose M here: the
 36           module will be called cpufreq_stats.
 37 
 38           If in doubt, say N.
 39 
 40 config CPU_FREQ_STAT_DETAILS
 41         bool "CPU frequency translation statistics details"
 42         depends on CPU_FREQ_STAT
 43         help
 44           This will show detail CPU frequency translation table in sysfs file
 45           system.
 46 
 47           If in doubt, say N.
 48 
 49 choice
 50         prompt "Default CPUFreq governor"
 51         default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
 52         default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 53         help
 54           This option sets which CPUFreq governor shall be loaded at
 55           startup. If in doubt, select 'performance'.
 56 
 57 config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 58         bool "performance"
 59         select CPU_FREQ_GOV_PERFORMANCE
 60         help
 61           Use the CPUFreq governor 'performance' as default. This sets
 62           the frequency statically to the highest frequency supported by
 63           the CPU.
 64 
 65 config CPU_FREQ_DEFAULT_GOV_POWERSAVE
 66         bool "powersave"
 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 comment "CPU frequency scaling drivers"
187 
188 config CPUFREQ_DT
189         tristate "Generic DT based cpufreq driver"
190         depends on HAVE_CLK && OF
191         # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
192         depends on !CPU_THERMAL || THERMAL
193         select PM_OPP
194         help
195           This adds a generic DT based cpufreq driver for frequency management.
196           It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
197           systems which share clock and voltage across all CPUs.
198 
199           If in doubt, say N.
200 
201 if X86
202 source "drivers/cpufreq/Kconfig.x86"
203 endif
204 
205 if ARM || ARM64
206 source "drivers/cpufreq/Kconfig.arm"
207 endif
208 
209 if PPC32 || PPC64
210 source "drivers/cpufreq/Kconfig.powerpc"
211 endif
212 
213 if AVR32
214 config AVR32_AT32AP_CPUFREQ
215         bool "CPU frequency driver for AT32AP"
216         depends on PLATFORM_AT32AP
217         default n
218         help
219           This enables the CPU frequency driver for AT32AP processors.
220           If in doubt, say N.
221 endif
222 
223 if IA64
224 config IA64_ACPI_CPUFREQ
225         tristate "ACPI Processor P-States driver"
226         depends on ACPI_PROCESSOR
227         help
228         This driver adds a CPUFreq driver which utilizes the ACPI
229         Processor Performance States.
230 
231         For details, take a look at <file:Documentation/cpu-freq/>.
232 
233         If in doubt, say N.
234 endif
235 
236 if MIPS
237 config LOONGSON2_CPUFREQ
238         tristate "Loongson2 CPUFreq Driver"
239         help
240           This option adds a CPUFreq driver for loongson processors which
241           support software configurable cpu frequency.
242 
243           Loongson2F and it's successors support this feature.
244 
245           For details, take a look at <file:Documentation/cpu-freq/>.
246 
247           If in doubt, say N.
248 
249 config LOONGSON1_CPUFREQ
250         tristate "Loongson1 CPUFreq Driver"
251         help
252           This option adds a CPUFreq driver for loongson1 processors which
253           support software configurable cpu frequency.
254 
255           For details, take a look at <file:Documentation/cpu-freq/>.
256 
257           If in doubt, say N.
258 endif
259 
260 if SPARC64
261 config SPARC_US3_CPUFREQ
262         tristate "UltraSPARC-III CPU Frequency driver"
263         help
264           This adds the CPUFreq driver for UltraSPARC-III processors.
265 
266           For details, take a look at <file:Documentation/cpu-freq>.
267 
268           If in doubt, say N.
269 
270 config SPARC_US2E_CPUFREQ
271         tristate "UltraSPARC-IIe CPU Frequency driver"
272         help
273           This adds the CPUFreq driver for UltraSPARC-IIe processors.
274 
275           For details, take a look at <file:Documentation/cpu-freq>.
276 
277           If in doubt, say N.
278 endif
279 
280 if 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 endif
295 
296 config QORIQ_CPUFREQ
297         tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
298         depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
299         select CLK_QORIQ
300         help
301           This adds the CPUFreq driver support for Freescale QorIQ SoCs
302           which are capable of changing the CPU's frequency dynamically.
303 
304 endif
305 endmenu

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