[deliverable/linux.git] / drivers / cpufreq / Kconfig

menu "CPU Frequency scaling"

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_GOV_COMMON
	bool

config CPU_FREQ_STAT
	tristate "CPU frequency translation statistics"
	default y
	help
	  This driver exports CPU frequency statistics information through sysfs
	  file system.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_stats.

	  If in doubt, say N.

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.

	  If in doubt, say N.

choice
	prompt "Default CPUFreq governor"
	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
	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_POWERSAVE
	bool "powersave"
	depends on EXPERT
	select CPU_FREQ_GOV_POWERSAVE
	help
	  Use the CPUFreq governor 'powersave' as default. This sets
	  the frequency statically to the lowest 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 a userspace 
	  program shall be able to set the CPU dynamically without having
	  to enable the userspace governor manually.

config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	bool "ondemand"
	select CPU_FREQ_GOV_ONDEMAND
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'ondemand' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the ondemand
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.

config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	bool "conservative"
	select CPU_FREQ_GOV_CONSERVATIVE
	select CPU_FREQ_GOV_PERFORMANCE
	help
	  Use the CPUFreq governor 'conservative' as default. This allows
	  you to get a full dynamic frequency capable system by simply
	  loading your cpufreq low-level hardware driver.
	  Be aware that not all cpufreq drivers support the conservative
	  governor. If unsure have a look at the help section of the
	  driver. Fallback governor will be the performance governor.
endchoice

config CPU_FREQ_GOV_PERFORMANCE
	tristate "'performance' governor"
	help
	  This cpufreq governor sets the frequency statically to the
	  highest available CPU frequency.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_performance.

	  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.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_powersave.

	  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 a userspace program shall
	  be able to set the CPU dynamically, like on LART 
	  <http://www.lartmaker.nl/>.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_userspace.

	  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"
	select CPU_FREQ_GOV_COMMON
	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). 

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_ondemand.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config CPU_FREQ_GOV_CONSERVATIVE
	tristate "'conservative' cpufreq governor"
	depends on CPU_FREQ
	select CPU_FREQ_GOV_COMMON
	help
	  'conservative' - this driver is rather similar to the 'ondemand'
	  governor both in its source code and its purpose, the difference is
	  its optimisation for better suitability in a battery powered
	  environment.  The frequency is gracefully increased and decreased
	  rather than jumping to 100% when speed is required.

	  If you have a desktop machine then you should really be considering
	  the 'ondemand' governor instead, however if you are using a laptop,
	  PDA or even an AMD64 based computer (due to the unacceptable
	  step-by-step latency issues between the minimum and maximum frequency
	  transitions in the CPU) you will probably want to use this governor.

	  To compile this driver as a module, choose M here: the
	  module will be called cpufreq_conservative.

	  For details, take a look at linux/Documentation/cpu-freq.

	  If in doubt, say N.

config GENERIC_CPUFREQ_CPU0
	tristate "Generic CPU0 cpufreq driver"
	depends on HAVE_CLK && REGULATOR && OF
	select PM_OPP
	help
	  This adds a generic cpufreq driver for CPU0 frequency management.
	  It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	  systems which share clock and voltage across all CPUs.

	  If in doubt, say N.

menu "x86 CPU frequency scaling drivers"
depends on X86
source "drivers/cpufreq/Kconfig.x86"
endmenu

menu "ARM CPU frequency scaling drivers"
depends on ARM
source "drivers/cpufreq/Kconfig.arm"
endmenu

menu "AVR32 CPU frequency scaling drivers"
depends on AVR32

config AVR32_AT32AP_CPUFREQ
	bool "CPU frequency driver for AT32AP"
	depends on PLATFORM_AT32AP
	default n
	help
	  This enables the CPU frequency driver for AT32AP processors.
	  If in doubt, say N.

endmenu

menu "CPUFreq processor drivers"
depends on IA64

config IA64_ACPI_CPUFREQ
	tristate "ACPI Processor P-States driver"
	depends on ACPI_PROCESSOR
	help
	This driver adds a CPUFreq driver which utilizes the ACPI
	Processor Performance States.

	For details, take a look at <file:Documentation/cpu-freq/>.

	If in doubt, say N.

endmenu

menu "MIPS CPUFreq processor drivers"
depends on MIPS

config LOONGSON2_CPUFREQ
	tristate "Loongson2 CPUFreq Driver"
	help
	  This option adds a CPUFreq driver for loongson processors which
	  support software configurable cpu frequency.

	  Loongson2F and it's successors support this feature.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

endmenu

menu "PowerPC CPU frequency scaling drivers"
depends on PPC32 || PPC64
source "drivers/cpufreq/Kconfig.powerpc"
endmenu

menu "SPARC CPU frequency scaling drivers"
depends on SPARC64
config SPARC_US3_CPUFREQ
	tristate "UltraSPARC-III CPU Frequency driver"
	help
	  This adds the CPUFreq driver for UltraSPARC-III processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

config SPARC_US2E_CPUFREQ
	tristate "UltraSPARC-IIe CPU Frequency driver"
	help
	  This adds the CPUFreq driver for UltraSPARC-IIe processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.
endmenu

menu "SH CPU Frequency scaling"
depends on SUPERH
config SH_CPU_FREQ
	tristate "SuperH CPU Frequency driver"
	help
	  This adds the cpufreq driver for SuperH. Any CPU that supports
	  clock rate rounding through the clock framework can use this
	  driver. While it will make the kernel slightly larger, this is
	  harmless for CPUs that don't support rate rounding. The driver
	  will also generate a notice in the boot log before disabling
	  itself if the CPU in question is not capable of rate rounding.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If unsure, say N.
endmenu

endif
endmenu
Commit	Line	Data
bb0a56ec DJ	1	menu "CPU Frequency scaling"
bb0a56ec DJ	2
1da177e4 LT	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
1e15f295 LF	20	config CPU_FREQ_GOV_COMMON
	21	bool
	22
1da177e4	23	config CPU_FREQ_STAT
9101be53	24	tristate "CPU frequency translation statistics"
9101be53 MF	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.
1da177e4 LT	34
1da177e4 LT	35	config CPU_FREQ_STAT_DETAILS
9101be53 MF	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.
1da177e4 LT	43
	44	choice
	45	prompt "Default CPUFreq governor"
559f56c7	46	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ \|\| ARM_SA1110_CPUFREQ
1da177e4 LT	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
30d221db AG	60	config CPU_FREQ_DEFAULT_GOV_POWERSAVE
30d221db AG	61	bool "powersave"
6a108a14	62	depends on EXPERT
30d221db AG	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
1da177e4 LT	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
0211a9c8	74	you to set the CPU frequency manually or when a userspace
1da177e4 LT	75	program shall be able to set the CPU dynamically without having
	76	to enable the userspace governor manually.
	77
1c256245 TR	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.
1da177e4 LT	101	endchoice
	102
	103	config CPU_FREQ_GOV_PERFORMANCE
9101be53 MF	104	tristate "'performance' governor"
9101be53 MF	105	help
1da177e4 LT	106	This cpufreq governor sets the frequency statically to the
	107	highest available CPU frequency.
	108
9101be53 MF	109	To compile this driver as a module, choose M here: the
	110	module will be called cpufreq_performance.
	111
1da177e4 LT	112	If in doubt, say Y.
	113
	114	config CPU_FREQ_GOV_POWERSAVE
9101be53 MF	115	tristate "'powersave' governor"
9101be53 MF	116	help
1da177e4 LT	117	This cpufreq governor sets the frequency statically to the
	118	lowest available CPU frequency.
	119
9101be53 MF	120	To compile this driver as a module, choose M here: the
	121	module will be called cpufreq_powersave.
	122
1da177e4 LT	123	If in doubt, say Y.
	124
	125	config CPU_FREQ_GOV_USERSPACE
9101be53 MF	126	tristate "'userspace' governor for userspace frequency scaling"
9101be53 MF	127	help
1da177e4	128	Enable this cpufreq governor when you either want to set the
0211a9c8	129	CPU frequency manually or when a userspace program shall
1da177e4	130	be able to set the CPU dynamically, like on LART
4c41251e	131	<http://www.lartmaker.nl/>.
1da177e4	132
9101be53 MF	133	To compile this driver as a module, choose M here: the
	134	module will be called cpufreq_userspace.
	135
1da177e4 LT	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"
1e15f295	142	select CPU_FREQ_GOV_COMMON
1da177e4 LT	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
9101be53 MF	151	To compile this driver as a module, choose M here: the
	152	module will be called cpufreq_ondemand.
	153
1da177e4 LT	154	For details, take a look at linux/Documentation/cpu-freq.
	155
	156	If in doubt, say N.
	157
b9170836 DJ	158	config CPU_FREQ_GOV_CONSERVATIVE
	159	tristate "'conservative' cpufreq governor"
	160	depends on CPU_FREQ
1e15f295	161	select CPU_FREQ_GOV_COMMON
b9170836 DJ	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
9101be53 MF	175	To compile this driver as a module, choose M here: the
	176	module will be called cpufreq_conservative.
	177
b9170836 DJ	178	For details, take a look at linux/Documentation/cpu-freq.
	179
	180	If in doubt, say N.
	181
95ceafd4	182	config GENERIC_CPUFREQ_CPU0
5553f9e2	183	tristate "Generic CPU0 cpufreq driver"
109df086 MB	184	depends on HAVE_CLK && REGULATOR && OF
109df086 MB	185	select PM_OPP
95ceafd4 SG	186	help
	187	This adds a generic cpufreq driver for CPU0 frequency management.
	188	It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	189	systems which share clock and voltage across all CPUs.
	190
	191	If in doubt, say N.
	192
bb0a56ec DJ	193	menu "x86 CPU frequency scaling drivers"
	194	depends on X86
	195	source "drivers/cpufreq/Kconfig.x86"
	196	endmenu
	197
f7d77079 KK	198	menu "ARM CPU frequency scaling drivers"
	199	depends on ARM
	200	source "drivers/cpufreq/Kconfig.arm"
	201	endmenu
	202
81c720c9 VK	203	menu "AVR32 CPU frequency scaling drivers"
	204	depends on AVR32
	205
	206	config AVR32_AT32AP_CPUFREQ
	207	bool "CPU frequency driver for AT32AP"
	208	depends on PLATFORM_AT32AP
	209	default n
	210	help
	211	This enables the CPU frequency driver for AT32AP processors.
	212	If in doubt, say N.
	213
	214	endmenu
	215
ab423e43 VK	216	menu "CPUFreq processor drivers"
	217	depends on IA64
	218
	219	config IA64_ACPI_CPUFREQ
	220	tristate "ACPI Processor P-States driver"
ab423e43 VK	221	depends on ACPI_PROCESSOR
	222	help
	223	This driver adds a CPUFreq driver which utilizes the ACPI
	224	Processor Performance States.
	225
	226	For details, take a look at <file:Documentation/cpu-freq/>.
	227
	228	If in doubt, say N.
	229
	230	endmenu
	231
7a998935 VK	232	menu "MIPS CPUFreq processor drivers"
	233	depends on MIPS
	234
	235	config LOONGSON2_CPUFREQ
	236	tristate "Loongson2 CPUFreq Driver"
7a998935 VK	237	help
	238	This option adds a CPUFreq driver for loongson processors which
	239	support software configurable cpu frequency.
	240
	241	Loongson2F and it's successors support this feature.
	242
	243	For details, take a look at <file:Documentation/cpu-freq/>.
	244
	245	If in doubt, say N.
	246
	247	endmenu
	248
5d8c6658 DES	249	menu "PowerPC CPU frequency scaling drivers"
	250	depends on PPC32 \|\| PPC64
	251	source "drivers/cpufreq/Kconfig.powerpc"
	252	endmenu
	253
764295ae VK	254	menu "SPARC CPU frequency scaling drivers"
	255	depends on SPARC64
	256	config SPARC_US3_CPUFREQ
	257	tristate "UltraSPARC-III CPU Frequency driver"
764295ae VK	258	help
	259	This adds the CPUFreq driver for UltraSPARC-III processors.
	260
	261	For details, take a look at <file:Documentation/cpu-freq>.
	262
	263	If in doubt, say N.
	264
	265	config SPARC_US2E_CPUFREQ
	266	tristate "UltraSPARC-IIe CPU Frequency driver"
764295ae VK	267	help
	268	This adds the CPUFreq driver for UltraSPARC-IIe processors.
	269
	270	For details, take a look at <file:Documentation/cpu-freq>.
	271
	272	If in doubt, say N.
	273	endmenu
	274
7258267e VK	275	menu "SH CPU Frequency scaling"
	276	depends on SUPERH
	277	config SH_CPU_FREQ
	278	tristate "SuperH CPU Frequency driver"
7258267e VK	279	help
	280	This adds the cpufreq driver for SuperH. Any CPU that supports
	281	clock rate rounding through the clock framework can use this
	282	driver. While it will make the kernel slightly larger, this is
	283	harmless for CPUs that don't support rate rounding. The driver
	284	will also generate a notice in the boot log before disabling
	285	itself if the CPU in question is not capable of rate rounding.
	286
	287	For details, take a look at <file:Documentation/cpu-freq>.
	288
	289	If unsure, say N.
	290	endmenu
	291
bb0a56ec DJ	292	endif
bb0a56ec DJ	293	endmenu