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1menu "CPU Frequency scaling"
2
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3config CPU_FREQ
4 bool "CPU Frequency scaling"
83fe27ea 5 select SRCU
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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
19if CPU_FREQ
20
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21config CPU_FREQ_GOV_COMMON
22 bool
23
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24config CPU_FREQ_BOOST_SW
25 bool
26 depends on THERMAL
27
1da177e4 28config CPU_FREQ_STAT
9101be53 29 tristate "CPU frequency translation statistics"
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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.
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39
40config CPU_FREQ_STAT_DETAILS
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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.
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48
49choice
50 prompt "Default CPUFreq governor"
559f56c7 51 default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
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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
57config 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
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65config CPU_FREQ_DEFAULT_GOV_POWERSAVE
66 bool "powersave"
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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
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73config 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
0211a9c8 78 you to set the CPU frequency manually or when a userspace
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79 program shall be able to set the CPU dynamically without having
80 to enable the userspace governor manually.
81
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82config 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.
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105endchoice
106
107config CPU_FREQ_GOV_PERFORMANCE
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108 tristate "'performance' governor"
109 help
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110 This cpufreq governor sets the frequency statically to the
111 highest available CPU frequency.
112
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113 To compile this driver as a module, choose M here: the
114 module will be called cpufreq_performance.
115
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116 If in doubt, say Y.
117
118config CPU_FREQ_GOV_POWERSAVE
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119 tristate "'powersave' governor"
120 help
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121 This cpufreq governor sets the frequency statically to the
122 lowest available CPU frequency.
123
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124 To compile this driver as a module, choose M here: the
125 module will be called cpufreq_powersave.
126
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127 If in doubt, say Y.
128
129config CPU_FREQ_GOV_USERSPACE
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130 tristate "'userspace' governor for userspace frequency scaling"
131 help
1da177e4 132 Enable this cpufreq governor when you either want to set the
0211a9c8 133 CPU frequency manually or when a userspace program shall
1da177e4 134 be able to set the CPU dynamically, like on LART
4c41251e 135 <http://www.lartmaker.nl/>.
1da177e4 136
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137 To compile this driver as a module, choose M here: the
138 module will be called cpufreq_userspace.
139
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140 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"
1e15f295 146 select CPU_FREQ_GOV_COMMON
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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
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155 To compile this driver as a module, choose M here: the
156 module will be called cpufreq_ondemand.
157
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158 For details, take a look at linux/Documentation/cpu-freq.
159
160 If in doubt, say N.
161
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162config CPU_FREQ_GOV_CONSERVATIVE
163 tristate "'conservative' cpufreq governor"
164 depends on CPU_FREQ
1e15f295 165 select CPU_FREQ_GOV_COMMON
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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
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179 To compile this driver as a module, choose M here: the
180 module will be called cpufreq_conservative.
181
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182 For details, take a look at linux/Documentation/cpu-freq.
183
184 If in doubt, say N.
185
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186comment "CPU frequency scaling drivers"
187
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188config CPUFREQ_DT
189 tristate "Generic DT based cpufreq driver"
5fbfbcd3 190 depends on HAVE_CLK && OF
bbcf0719 191 # if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
217886d3 192 depends on !CPU_THERMAL || THERMAL
109df086 193 select PM_OPP
95ceafd4 194 help
bbcf0719 195 This adds a generic DT based cpufreq driver for frequency management.
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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
f41f4815 201if X86
bb0a56ec 202source "drivers/cpufreq/Kconfig.x86"
f41f4815 203endif
bb0a56ec 204
f41f4815 205if ARM || ARM64
f7d77079 206source "drivers/cpufreq/Kconfig.arm"
f41f4815 207endif
f7d77079 208
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209if PPC32 || PPC64
210source "drivers/cpufreq/Kconfig.powerpc"
211endif
81c720c9 212
f41f4815 213if AVR32
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214config 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.
f41f4815 221endif
81c720c9 222
f41f4815 223if IA64
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224config IA64_ACPI_CPUFREQ
225 tristate "ACPI Processor P-States driver"
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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.
f41f4815 234endif
ab423e43 235
f41f4815 236if MIPS
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237config LOONGSON2_CPUFREQ
238 tristate "Loongson2 CPUFreq Driver"
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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
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249config 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.
f41f4815 258endif
a0a22cf1 259
f41f4815 260if SPARC64
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261config SPARC_US3_CPUFREQ
262 tristate "UltraSPARC-III CPU Frequency driver"
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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
270config SPARC_US2E_CPUFREQ
271 tristate "UltraSPARC-IIe CPU Frequency driver"
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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.
f41f4815 278endif
764295ae 279
f41f4815 280if SUPERH
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281config SH_CPU_FREQ
282 tristate "SuperH CPU Frequency driver"
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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.
f41f4815 294endif
7258267e 295
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296config QORIQ_CPUFREQ
297 tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
298 depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
ddd30ef4 299 depends on !CPU_THERMAL || THERMAL
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300 select CLK_QORIQ
301 help
302 This adds the CPUFreq driver support for Freescale QorIQ SoCs
303 which are capable of changing the CPU's frequency dynamically.
304
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305endif
306endmenu