Documentation/cpu-freq/user-guide.txt

1      CPU frequency and voltage scaling code in the Linux(TM) kernel
13    Clock scaling allows you to change the clock speed of the CPUs on the
15             the clock speed, the less power the CPU consumes.
19 ---------
41 -------
46 ARM-SA1100
47 ARM-SA1110
52 -------
56 AMD Elan - SC400, SC410
57 AMD mobile K6-2+
58 AMD mobile K6-3+
64 Intel mobile PIII and Intel mobile PIII-M on certain chipsets
71 various processors on some ACPI 2.0-compatible systems [*]
74 to the ACPI<->BIOS interface.
78 -----------
83 UltraSPARC-III
87 -------
93 ----------
95 All SuperH processors supporting rate rounding through the clock
99 ------------
113 Some CPU frequency scaling-capable processor switch between various
115 user involvement. This guarantees very fast switching to a frequency
121 ----------
124 frequency limit as well as whether you want more aggressive
125 power-saving or more instantly available processing power.
129 ------------
134 "governor" is the "userspace" governor. This one allows the user - or
135 a yet-to-implement userspace program - to decide what specific speed
143 ------------------------------
147 "cpufreq" within the cpu-device directory
151 				frequency the processor can run at(in kHz)
153 				frequency the processor can run at(in kHz)
158 				work with the ondemand governor, -1
162 				frequency for a kernel governor or
164 				switch the frequency too often
167 				used to set the frequency on this CPU
175 				that some governors won't load - they only
179 cpuinfo_cur_freq :		Current frequency of the CPU as obtained from
180 				the hardware, in KHz. This is the frequency
194 				of frequency.
196 related_cpus :			List of CPUs that need some sort of frequency
201 scaling_cur_freq :		Current frequency of the CPU as determined by
203 				the frequency the kernel thinks the CPU runs
208 				maximum available frequency from this file.
218 set the CPU operating frequency to a specific value, you can read out
219 the current frequency in
221 scaling_setspeed.		By "echoing" a new frequency into this