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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/cpufreq/Kconfig
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Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+config CPU_FREQ
+ bool "CPU Frequency scaling"
+ help
+ CPU Frequency scaling allows you to change the clock speed of
+ CPUs on the fly. This is a nice method to save power, because
+ the lower the CPU clock speed, the less power the CPU consumes.
+
+ Note that this driver doesn't automatically change the CPU
+ clock speed, you need to either enable a dynamic cpufreq governor
+ (see below) after boot, or use a userspace tool.
+
+ For details, take a look at <file:Documentation/cpu-freq>.
+
+ If in doubt, say N.
+
+if CPU_FREQ
+
+config CPU_FREQ_TABLE
+ def_tristate m
+
+config CPU_FREQ_DEBUG
+ bool "Enable CPUfreq debugging"
+ help
+ Say Y here to enable CPUfreq subsystem (including drivers)
+ debugging. You will need to activate it via the kernel
+ command line by passing
+ cpufreq.debug=<value>
+
+ To get <value>, add
+ 1 to activate CPUfreq core debugging,
+ 2 to activate CPUfreq drivers debugging, and
+ 4 to activate CPUfreq governor debugging
+
+config CPU_FREQ_STAT
+ tristate "CPU frequency translation statistics"
+ select CPU_FREQ_TABLE
+ default y
+ help
+ This driver exports CPU frequency statistics information through sysfs
+ file system
+
+config CPU_FREQ_STAT_DETAILS
+ bool "CPU frequency translation statistics details"
+ depends on CPU_FREQ_STAT
+ help
+ This will show detail CPU frequency translation table in sysfs file
+ system
+
+choice
+ prompt "Default CPUFreq governor"
+ default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
+ default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
+ help
+ This option sets which CPUFreq governor shall be loaded at
+ startup. If in doubt, select 'performance'.
+
+config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
+ bool "performance"
+ select CPU_FREQ_GOV_PERFORMANCE
+ help
+ Use the CPUFreq governor 'performance' as default. This sets
+ the frequency statically to the highest frequency supported by
+ the CPU.
+
+config CPU_FREQ_DEFAULT_GOV_USERSPACE
+ bool "userspace"
+ select CPU_FREQ_GOV_USERSPACE
+ help
+ Use the CPUFreq governor 'userspace' as default. This allows
+ you to set the CPU frequency manually or when an userspace
+ program shall be able to set the CPU dynamically without having
+ to enable the userspace governor manually.
+
+endchoice
+
+config CPU_FREQ_GOV_PERFORMANCE
+ tristate "'performance' governor"
+ help
+ This cpufreq governor sets the frequency statically to the
+ highest available CPU frequency.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_POWERSAVE
+ tristate "'powersave' governor"
+ help
+ This cpufreq governor sets the frequency statically to the
+ lowest available CPU frequency.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_USERSPACE
+ tristate "'userspace' governor for userspace frequency scaling"
+ help
+ Enable this cpufreq governor when you either want to set the
+ CPU frequency manually or when an userspace program shall
+ be able to set the CPU dynamically, like on LART
+ <http://www.lart.tudelft.nl/>
+
+ For details, take a look at <file:Documentation/cpu-freq/>.
+
+ If in doubt, say Y.
+
+config CPU_FREQ_GOV_ONDEMAND
+ tristate "'ondemand' cpufreq policy governor"
+ help
+ 'ondemand' - This driver adds a dynamic cpufreq policy governor.
+ The governor does a periodic polling and
+ changes frequency based on the CPU utilization.
+ The support for this governor depends on CPU capability to
+ do fast frequency switching (i.e, very low latency frequency
+ transitions).
+
+ For details, take a look at linux/Documentation/cpu-freq.
+
+ If in doubt, say N.
+
+endif # CPU_FREQ