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-rw-r--r--drivers/cpufreq/Kconfig118
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1config CPU_FREQ
2 bool "CPU Frequency scaling"
3 help
4 CPU Frequency scaling allows you to change the clock speed of
5 CPUs on the fly. This is a nice method to save power, because
6 the lower the CPU clock speed, the less power the CPU consumes.
7
8 Note that this driver doesn't automatically change the CPU
9 clock speed, you need to either enable a dynamic cpufreq governor
10 (see below) after boot, or use a userspace tool.
11
12 For details, take a look at <file:Documentation/cpu-freq>.
13
14 If in doubt, say N.
15
16if CPU_FREQ
17
18config CPU_FREQ_TABLE
19 def_tristate m
20
21config CPU_FREQ_DEBUG
22 bool "Enable CPUfreq debugging"
23 help
24 Say Y here to enable CPUfreq subsystem (including drivers)
25 debugging. You will need to activate it via the kernel
26 command line by passing
27 cpufreq.debug=<value>
28
29 To get <value>, add
30 1 to activate CPUfreq core debugging,
31 2 to activate CPUfreq drivers debugging, and
32 4 to activate CPUfreq governor debugging
33
34config CPU_FREQ_STAT
35 tristate "CPU frequency translation statistics"
36 select CPU_FREQ_TABLE
37 default y
38 help
39 This driver exports CPU frequency statistics information through sysfs
40 file system
41
42config CPU_FREQ_STAT_DETAILS
43 bool "CPU frequency translation statistics details"
44 depends on CPU_FREQ_STAT
45 help
46 This will show detail CPU frequency translation table in sysfs file
47 system
48
49choice
50 prompt "Default CPUFreq governor"
51 default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
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
65config CPU_FREQ_DEFAULT_GOV_USERSPACE
66 bool "userspace"
67 select CPU_FREQ_GOV_USERSPACE
68 help
69 Use the CPUFreq governor 'userspace' as default. This allows
70 you to set the CPU frequency manually or when an userspace
71 program shall be able to set the CPU dynamically without having
72 to enable the userspace governor manually.
73
74endchoice
75
76config CPU_FREQ_GOV_PERFORMANCE
77 tristate "'performance' governor"
78 help
79 This cpufreq governor sets the frequency statically to the
80 highest available CPU frequency.
81
82 If in doubt, say Y.
83
84config CPU_FREQ_GOV_POWERSAVE
85 tristate "'powersave' governor"
86 help
87 This cpufreq governor sets the frequency statically to the
88 lowest available CPU frequency.
89
90 If in doubt, say Y.
91
92config CPU_FREQ_GOV_USERSPACE
93 tristate "'userspace' governor for userspace frequency scaling"
94 help
95 Enable this cpufreq governor when you either want to set the
96 CPU frequency manually or when an userspace program shall
97 be able to set the CPU dynamically, like on LART
98 <http://www.lart.tudelft.nl/>
99
100 For details, take a look at <file:Documentation/cpu-freq/>.
101
102 If in doubt, say Y.
103
104config CPU_FREQ_GOV_ONDEMAND
105 tristate "'ondemand' cpufreq policy governor"
106 help
107 'ondemand' - This driver adds a dynamic cpufreq policy governor.
108 The governor does a periodic polling and
109 changes frequency based on the CPU utilization.
110 The support for this governor depends on CPU capability to
111 do fast frequency switching (i.e, very low latency frequency
112 transitions).
113
114 For details, take a look at linux/Documentation/cpu-freq.
115
116 If in doubt, say N.
117
118endif # CPU_FREQ