Root/
Source at commit 694c7fbe86b8a9c91392e505afcb9fcfc91deccc created 13 years 12 days ago. By Maarten ter Huurne, MIPS: JZ4740: Add cpufreq support | |
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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_STAT |
24 | tristate "CPU frequency translation statistics" |
25 | default y |
26 | help |
27 | This driver exports CPU frequency statistics information through sysfs |
28 | file system. |
29 | |
30 | To compile this driver as a module, choose M here: the |
31 | module will be called cpufreq_stats. |
32 | |
33 | If in doubt, say N. |
34 | |
35 | config CPU_FREQ_STAT_DETAILS |
36 | bool "CPU frequency translation statistics details" |
37 | depends on CPU_FREQ_STAT |
38 | help |
39 | This will show detail CPU frequency translation table in sysfs file |
40 | system. |
41 | |
42 | If in doubt, say N. |
43 | |
44 | choice |
45 | prompt "Default CPUFreq governor" |
46 | default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ |
47 | default CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
48 | help |
49 | This option sets which CPUFreq governor shall be loaded at |
50 | startup. If in doubt, select 'performance'. |
51 | |
52 | config CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
53 | bool "performance" |
54 | select CPU_FREQ_GOV_PERFORMANCE |
55 | help |
56 | Use the CPUFreq governor 'performance' as default. This sets |
57 | the frequency statically to the highest frequency supported by |
58 | the CPU. |
59 | |
60 | config CPU_FREQ_DEFAULT_GOV_POWERSAVE |
61 | bool "powersave" |
62 | depends on EXPERT |
63 | select CPU_FREQ_GOV_POWERSAVE |
64 | help |
65 | Use the CPUFreq governor 'powersave' as default. This sets |
66 | the frequency statically to the lowest frequency supported by |
67 | the CPU. |
68 | |
69 | config CPU_FREQ_DEFAULT_GOV_USERSPACE |
70 | bool "userspace" |
71 | select CPU_FREQ_GOV_USERSPACE |
72 | help |
73 | Use the CPUFreq governor 'userspace' as default. This allows |
74 | you to set the CPU frequency manually or when a userspace |
75 | program shall be able to set the CPU dynamically without having |
76 | to enable the userspace governor manually. |
77 | |
78 | config CPU_FREQ_DEFAULT_GOV_ONDEMAND |
79 | bool "ondemand" |
80 | select CPU_FREQ_GOV_ONDEMAND |
81 | select CPU_FREQ_GOV_PERFORMANCE |
82 | help |
83 | Use the CPUFreq governor 'ondemand' as default. This allows |
84 | you to get a full dynamic frequency capable system by simply |
85 | loading your cpufreq low-level hardware driver. |
86 | Be aware that not all cpufreq drivers support the ondemand |
87 | governor. If unsure have a look at the help section of the |
88 | driver. Fallback governor will be the performance governor. |
89 | |
90 | config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
91 | bool "conservative" |
92 | select CPU_FREQ_GOV_CONSERVATIVE |
93 | select CPU_FREQ_GOV_PERFORMANCE |
94 | help |
95 | Use the CPUFreq governor 'conservative' as default. This allows |
96 | you to get a full dynamic frequency capable system by simply |
97 | loading your cpufreq low-level hardware driver. |
98 | Be aware that not all cpufreq drivers support the conservative |
99 | governor. If unsure have a look at the help section of the |
100 | driver. Fallback governor will be the performance governor. |
101 | endchoice |
102 | |
103 | config CPU_FREQ_GOV_PERFORMANCE |
104 | tristate "'performance' governor" |
105 | help |
106 | This cpufreq governor sets the frequency statically to the |
107 | highest available CPU frequency. |
108 | |
109 | To compile this driver as a module, choose M here: the |
110 | module will be called cpufreq_performance. |
111 | |
112 | If in doubt, say Y. |
113 | |
114 | config CPU_FREQ_GOV_POWERSAVE |
115 | tristate "'powersave' governor" |
116 | help |
117 | This cpufreq governor sets the frequency statically to the |
118 | lowest available CPU frequency. |
119 | |
120 | To compile this driver as a module, choose M here: the |
121 | module will be called cpufreq_powersave. |
122 | |
123 | If in doubt, say Y. |
124 | |
125 | config CPU_FREQ_GOV_USERSPACE |
126 | tristate "'userspace' governor for userspace frequency scaling" |
127 | help |
128 | Enable this cpufreq governor when you either want to set the |
129 | CPU frequency manually or when a userspace program shall |
130 | be able to set the CPU dynamically, like on LART |
131 | <http://www.lartmaker.nl/>. |
132 | |
133 | To compile this driver as a module, choose M here: the |
134 | module will be called cpufreq_userspace. |
135 | |
136 | For details, take a look at <file:Documentation/cpu-freq/>. |
137 | |
138 | If in doubt, say Y. |
139 | |
140 | config CPU_FREQ_GOV_ONDEMAND |
141 | tristate "'ondemand' cpufreq policy governor" |
142 | select CPU_FREQ_GOV_COMMON |
143 | help |
144 | 'ondemand' - This driver adds a dynamic cpufreq policy governor. |
145 | The governor does a periodic polling and |
146 | changes frequency based on the CPU utilization. |
147 | The support for this governor depends on CPU capability to |
148 | do fast frequency switching (i.e, very low latency frequency |
149 | transitions). |
150 | |
151 | To compile this driver as a module, choose M here: the |
152 | module will be called cpufreq_ondemand. |
153 | |
154 | For details, take a look at linux/Documentation/cpu-freq. |
155 | |
156 | If in doubt, say N. |
157 | |
158 | config CPU_FREQ_GOV_CONSERVATIVE |
159 | tristate "'conservative' cpufreq governor" |
160 | depends on CPU_FREQ |
161 | select CPU_FREQ_GOV_COMMON |
162 | help |
163 | 'conservative' - this driver is rather similar to the 'ondemand' |
164 | governor both in its source code and its purpose, the difference is |
165 | its optimisation for better suitability in a battery powered |
166 | environment. The frequency is gracefully increased and decreased |
167 | rather than jumping to 100% when speed is required. |
168 | |
169 | If you have a desktop machine then you should really be considering |
170 | the 'ondemand' governor instead, however if you are using a laptop, |
171 | PDA or even an AMD64 based computer (due to the unacceptable |
172 | step-by-step latency issues between the minimum and maximum frequency |
173 | transitions in the CPU) you will probably want to use this governor. |
174 | |
175 | To compile this driver as a module, choose M here: the |
176 | module will be called cpufreq_conservative. |
177 | |
178 | For details, take a look at linux/Documentation/cpu-freq. |
179 | |
180 | If in doubt, say N. |
181 | |
182 | config GENERIC_CPUFREQ_CPU0 |
183 | tristate "Generic CPU0 cpufreq driver" |
184 | depends on HAVE_CLK && REGULATOR && PM_OPP && OF |
185 | help |
186 | This adds a generic cpufreq driver for CPU0 frequency management. |
187 | It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) |
188 | systems which share clock and voltage across all CPUs. |
189 | |
190 | If in doubt, say N. |
191 | |
192 | menu "x86 CPU frequency scaling drivers" |
193 | depends on X86 |
194 | source "drivers/cpufreq/Kconfig.x86" |
195 | endmenu |
196 | |
197 | menu "ARM CPU frequency scaling drivers" |
198 | depends on ARM |
199 | source "drivers/cpufreq/Kconfig.arm" |
200 | endmenu |
201 | |
202 | menu "AVR32 CPU frequency scaling drivers" |
203 | depends on AVR32 |
204 | |
205 | config AVR32_AT32AP_CPUFREQ |
206 | bool "CPU frequency driver for AT32AP" |
207 | depends on PLATFORM_AT32AP |
208 | default n |
209 | help |
210 | This enables the CPU frequency driver for AT32AP processors. |
211 | If in doubt, say N. |
212 | |
213 | endmenu |
214 | |
215 | menu "CPUFreq processor drivers" |
216 | depends on IA64 |
217 | |
218 | config IA64_ACPI_CPUFREQ |
219 | tristate "ACPI Processor P-States driver" |
220 | depends on ACPI_PROCESSOR |
221 | help |
222 | This driver adds a CPUFreq driver which utilizes the ACPI |
223 | Processor Performance States. |
224 | |
225 | For details, take a look at <file:Documentation/cpu-freq/>. |
226 | |
227 | If in doubt, say N. |
228 | |
229 | endmenu |
230 | |
231 | menu "MIPS CPUFreq processor drivers" |
232 | depends on MIPS |
233 | |
234 | config LOONGSON2_CPUFREQ |
235 | tristate "Loongson2 CPUFreq Driver" |
236 | help |
237 | This option adds a CPUFreq driver for loongson processors which |
238 | support software configurable cpu frequency. |
239 | |
240 | Loongson2F and it's successors support this feature. |
241 | |
242 | For details, take a look at <file:Documentation/cpu-freq/>. |
243 | |
244 | If in doubt, say N. |
245 | |
246 | config CPU_FREQ_JZ |
247 | tristate "CPUfreq driver for JZ CPUs" |
248 | select CPU_FREQ_TABLE |
249 | depends on MACH_JZ4740 |
250 | default n |
251 | help |
252 | This enables the CPUfreq driver for JZ CPUs. |
253 | |
254 | If in doubt, say N. |
255 | |
256 | endmenu |
257 | |
258 | menu "PowerPC CPU frequency scaling drivers" |
259 | depends on PPC32 || PPC64 |
260 | source "drivers/cpufreq/Kconfig.powerpc" |
261 | endmenu |
262 | |
263 | menu "SPARC CPU frequency scaling drivers" |
264 | depends on SPARC64 |
265 | config SPARC_US3_CPUFREQ |
266 | tristate "UltraSPARC-III CPU Frequency driver" |
267 | help |
268 | This adds the CPUFreq driver for UltraSPARC-III processors. |
269 | |
270 | For details, take a look at <file:Documentation/cpu-freq>. |
271 | |
272 | If in doubt, say N. |
273 | |
274 | config SPARC_US2E_CPUFREQ |
275 | tristate "UltraSPARC-IIe CPU Frequency driver" |
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. |
282 | endmenu |
283 | |
284 | menu "SH CPU Frequency scaling" |
285 | depends on SUPERH |
286 | config SH_CPU_FREQ |
287 | tristate "SuperH CPU Frequency driver" |
288 | help |
289 | This adds the cpufreq driver for SuperH. Any CPU that supports |
290 | clock rate rounding through the clock framework can use this |
291 | driver. While it will make the kernel slightly larger, this is |
292 | harmless for CPUs that don't support rate rounding. The driver |
293 | will also generate a notice in the boot log before disabling |
294 | itself if the CPU in question is not capable of rate rounding. |
295 | |
296 | For details, take a look at <file:Documentation/cpu-freq>. |
297 | |
298 | If unsure, say N. |
299 | endmenu |
300 | |
301 | endif |
302 | endmenu |
303 |
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