Root/drivers/cpufreq/Kconfig

Source at commit 694c7fbe86b8a9c91392e505afcb9fcfc91deccc created 11 years 3 months ago.
By Maarten ter Huurne, MIPS: JZ4740: Add cpufreq support
1menu "CPU Frequency scaling"
2
3config 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_GOV_COMMON
21    bool
22
23config 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
35config 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
44choice
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
52config 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
60config 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
69config 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
78config 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
90config 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.
101endchoice
102
103config 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
114config 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
125config 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
140config 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
158config 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
182config 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
192menu "x86 CPU frequency scaling drivers"
193depends on X86
194source "drivers/cpufreq/Kconfig.x86"
195endmenu
196
197menu "ARM CPU frequency scaling drivers"
198depends on ARM
199source "drivers/cpufreq/Kconfig.arm"
200endmenu
201
202menu "AVR32 CPU frequency scaling drivers"
203depends on AVR32
204
205config 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
213endmenu
214
215menu "CPUFreq processor drivers"
216depends on IA64
217
218config 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
229endmenu
230
231menu "MIPS CPUFreq processor drivers"
232depends on MIPS
233
234config 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
246config 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
256endmenu
257
258menu "PowerPC CPU frequency scaling drivers"
259depends on PPC32 || PPC64
260source "drivers/cpufreq/Kconfig.powerpc"
261endmenu
262
263menu "SPARC CPU frequency scaling drivers"
264depends on SPARC64
265config 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
274config 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.
282endmenu
283
284menu "SH CPU Frequency scaling"
285depends on SUPERH
286config 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.
299endmenu
300
301endif
302endmenu
303

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