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Dave Jonesbb0a56e2011-05-19 18:51:07 -04001menu "CPU Frequency scaling"
2
Linus Torvalds1da177e2005-04-16 15:20:36 -07003config 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
18if CPU_FREQ
19
20config CPU_FREQ_TABLE
Mike Frysinger9101be52007-04-18 16:18:13 -040021 tristate
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Larry Finger1e15f292012-12-29 01:55:20 +000023config CPU_FREQ_GOV_COMMON
24 bool
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026config CPU_FREQ_STAT
Mike Frysinger9101be52007-04-18 16:18:13 -040027 tristate "CPU frequency translation statistics"
28 select CPU_FREQ_TABLE
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39config CPU_FREQ_STAT_DETAILS
Mike Frysinger9101be52007-04-18 16:18:13 -040040 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048choice
49 prompt "Default CPUFreq governor"
50 default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
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
56config 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
Alessandro Guido30d221d2008-04-18 13:31:13 -070064config CPU_FREQ_DEFAULT_GOV_POWERSAVE
65 bool "powersave"
David Rientjes6a108a12011-01-20 14:44:16 -080066 depends on EXPERT
Alessandro Guido30d221d2008-04-18 13:31:13 -070067 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070073config 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
Frederik Schwarzer0211a9c2008-12-29 22:14:56 +010078 you to set the CPU frequency manually or when a userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 program shall be able to set the CPU dynamically without having
80 to enable the userspace governor manually.
81
Thomas Renninger1c256242007-10-02 13:28:12 -070082config 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
94config 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105endchoice
106
107config CPU_FREQ_GOV_PERFORMANCE
Mike Frysinger9101be52007-04-18 16:18:13 -0400108 tristate "'performance' governor"
109 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 This cpufreq governor sets the frequency statically to the
111 highest available CPU frequency.
112
Mike Frysinger9101be52007-04-18 16:18:13 -0400113 To compile this driver as a module, choose M here: the
114 module will be called cpufreq_performance.
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 If in doubt, say Y.
117
118config CPU_FREQ_GOV_POWERSAVE
Mike Frysinger9101be52007-04-18 16:18:13 -0400119 tristate "'powersave' governor"
120 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 This cpufreq governor sets the frequency statically to the
122 lowest available CPU frequency.
123
Mike Frysinger9101be52007-04-18 16:18:13 -0400124 To compile this driver as a module, choose M here: the
125 module will be called cpufreq_powersave.
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 If in doubt, say Y.
128
129config CPU_FREQ_GOV_USERSPACE
Mike Frysinger9101be52007-04-18 16:18:13 -0400130 tristate "'userspace' governor for userspace frequency scaling"
131 help
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 Enable this cpufreq governor when you either want to set the
Frederik Schwarzer0211a9c2008-12-29 22:14:56 +0100133 CPU frequency manually or when a userspace program shall
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 be able to set the CPU dynamically, like on LART
Erik Mouw4c412512006-04-03 14:21:00 +0200135 <http://www.lartmaker.nl/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Mike Frysinger9101be52007-04-18 16:18:13 -0400137 To compile this driver as a module, choose M here: the
138 module will be called cpufreq_userspace.
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 For details, take a look at <file:Documentation/cpu-freq/>.
141
142 If in doubt, say Y.
143
144config CPU_FREQ_GOV_ONDEMAND
145 tristate "'ondemand' cpufreq policy governor"
Dave Jones6af6e1e2006-11-21 16:58:59 -0500146 select CPU_FREQ_TABLE
Larry Finger1e15f292012-12-29 01:55:20 +0000147 select CPU_FREQ_GOV_COMMON
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 help
149 'ondemand' - This driver adds a dynamic cpufreq policy governor.
150 The governor does a periodic polling and
151 changes frequency based on the CPU utilization.
152 The support for this governor depends on CPU capability to
153 do fast frequency switching (i.e, very low latency frequency
154 transitions).
155
Mike Frysinger9101be52007-04-18 16:18:13 -0400156 To compile this driver as a module, choose M here: the
157 module will be called cpufreq_ondemand.
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 For details, take a look at linux/Documentation/cpu-freq.
160
161 If in doubt, say N.
162
Dave Jonesb9170832005-05-31 19:03:47 -0700163config CPU_FREQ_GOV_CONSERVATIVE
164 tristate "'conservative' cpufreq governor"
165 depends on CPU_FREQ
Larry Finger1e15f292012-12-29 01:55:20 +0000166 select CPU_FREQ_GOV_COMMON
Dave Jonesb9170832005-05-31 19:03:47 -0700167 help
168 'conservative' - this driver is rather similar to the 'ondemand'
169 governor both in its source code and its purpose, the difference is
170 its optimisation for better suitability in a battery powered
171 environment. The frequency is gracefully increased and decreased
172 rather than jumping to 100% when speed is required.
173
174 If you have a desktop machine then you should really be considering
175 the 'ondemand' governor instead, however if you are using a laptop,
176 PDA or even an AMD64 based computer (due to the unacceptable
177 step-by-step latency issues between the minimum and maximum frequency
178 transitions in the CPU) you will probably want to use this governor.
179
Mike Frysinger9101be52007-04-18 16:18:13 -0400180 To compile this driver as a module, choose M here: the
181 module will be called cpufreq_conservative.
182
Dave Jonesb9170832005-05-31 19:03:47 -0700183 For details, take a look at linux/Documentation/cpu-freq.
184
185 If in doubt, say N.
186
Shawn Guo95ceafd2012-09-06 07:09:11 +0000187config GENERIC_CPUFREQ_CPU0
Shawn Guo5553f9e2013-01-30 14:27:49 +0000188 tristate "Generic CPU0 cpufreq driver"
Shawn Guo95ceafd2012-09-06 07:09:11 +0000189 depends on HAVE_CLK && REGULATOR && PM_OPP && OF
190 select CPU_FREQ_TABLE
191 help
192 This adds a generic cpufreq driver for CPU0 frequency management.
193 It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
194 systems which share clock and voltage across all CPUs.
195
196 If in doubt, say N.
197
Dave Jonesbb0a56e2011-05-19 18:51:07 -0400198menu "x86 CPU frequency scaling drivers"
199depends on X86
200source "drivers/cpufreq/Kconfig.x86"
201endmenu
202
Kukjin Kimf7d77072011-06-01 14:18:22 -0700203menu "ARM CPU frequency scaling drivers"
204depends on ARM
205source "drivers/cpufreq/Kconfig.arm"
206endmenu
207
Viresh Kumar81c720c2013-04-04 12:54:17 +0000208menu "AVR32 CPU frequency scaling drivers"
209depends on AVR32
210
211config AVR32_AT32AP_CPUFREQ
212 bool "CPU frequency driver for AT32AP"
213 depends on PLATFORM_AT32AP
214 default n
215 help
216 This enables the CPU frequency driver for AT32AP processors.
217 If in doubt, say N.
218
219endmenu
220
Viresh Kumarab423e42013-04-04 12:54:20 +0000221menu "CPUFreq processor drivers"
222depends on IA64
223
224config IA64_ACPI_CPUFREQ
225 tristate "ACPI Processor P-States driver"
226 select CPU_FREQ_TABLE
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
236endmenu
237
Viresh Kumar7a998932013-04-04 12:54:21 +0000238menu "MIPS CPUFreq processor drivers"
239depends on MIPS
240
241config LOONGSON2_CPUFREQ
242 tristate "Loongson2 CPUFreq Driver"
243 select CPU_FREQ_TABLE
244 help
245 This option adds a CPUFreq driver for loongson processors which
246 support software configurable cpu frequency.
247
248 Loongson2F and it's successors support this feature.
249
250 For details, take a look at <file:Documentation/cpu-freq/>.
251
252 If in doubt, say N.
253
254endmenu
255
Dmitry Eremin-Solenikov5d8c6652011-06-29 05:07:56 +0000256menu "PowerPC CPU frequency scaling drivers"
257depends on PPC32 || PPC64
258source "drivers/cpufreq/Kconfig.powerpc"
259endmenu
260
Viresh Kumar764295a2013-04-04 12:54:24 +0000261menu "SPARC CPU frequency scaling drivers"
262depends on SPARC64
263config SPARC_US3_CPUFREQ
264 tristate "UltraSPARC-III CPU Frequency driver"
265 select CPU_FREQ_TABLE
266 help
267 This adds the CPUFreq driver for UltraSPARC-III processors.
268
269 For details, take a look at <file:Documentation/cpu-freq>.
270
271 If in doubt, say N.
272
273config SPARC_US2E_CPUFREQ
274 tristate "UltraSPARC-IIe CPU Frequency driver"
275 select CPU_FREQ_TABLE
276 help
277 This adds the CPUFreq driver for UltraSPARC-IIe processors.
278
279 For details, take a look at <file:Documentation/cpu-freq>.
280
281 If in doubt, say N.
282endmenu
283
Viresh Kumar72582672013-04-04 12:54:22 +0000284menu "SH CPU Frequency scaling"
285depends on SUPERH
286config SH_CPU_FREQ
287 tristate "SuperH CPU Frequency driver"
288 select CPU_FREQ_TABLE
289 help
290 This adds the cpufreq driver for SuperH. Any CPU that supports
291 clock rate rounding through the clock framework can use this
292 driver. While it will make the kernel slightly larger, this is
293 harmless for CPUs that don't support rate rounding. The driver
294 will also generate a notice in the boot log before disabling
295 itself if the CPU in question is not capable of rate rounding.
296
297 For details, take a look at <file:Documentation/cpu-freq>.
298
299 If unsure, say N.
300endmenu
301
Dave Jonesbb0a56e2011-05-19 18:51:07 -0400302endif
303endmenu