[linux-2.6-block.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_BOOST_SW
	bool
	depends on THERMAL

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 && OF
	# if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
	depends on !CPU_THERMAL || THERMAL
	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 || ARM64
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
2fb4719b LM	23	config CPU_FREQ_BOOST_SW
	24	bool
	25	depends on THERMAL
	26
1da177e4	27	config CPU_FREQ_STAT
9101be53	28	tristate "CPU frequency translation statistics"
9101be53 MF	29	default y
	30	help
	31	This driver exports CPU frequency statistics information through sysfs
	32	file system.
	33
	34	To compile this driver as a module, choose M here: the
	35	module will be called cpufreq_stats.
	36
	37	If in doubt, say N.
1da177e4 LT	38
1da177e4 LT	39	config CPU_FREQ_STAT_DETAILS
9101be53 MF	40	bool "CPU frequency translation statistics details"
	41	depends on CPU_FREQ_STAT
	42	help
	43	This will show detail CPU frequency translation table in sysfs file
	44	system.
	45
	46	If in doubt, say N.
1da177e4 LT	47
	48	choice
	49	prompt "Default CPUFreq governor"
559f56c7	50	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ \|\| ARM_SA1110_CPUFREQ
1da177e4 LT	51	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	52	help
	53	This option sets which CPUFreq governor shall be loaded at
	54	startup. If in doubt, select 'performance'.
	55
	56	config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
	57	bool "performance"
	58	select CPU_FREQ_GOV_PERFORMANCE
	59	help
	60	Use the CPUFreq governor 'performance' as default. This sets
	61	the frequency statically to the highest frequency supported by
	62	the CPU.
	63
30d221db AG	64	config CPU_FREQ_DEFAULT_GOV_POWERSAVE
30d221db AG	65	bool "powersave"
6a108a14	66	depends on EXPERT
30d221db AG	67	select CPU_FREQ_GOV_POWERSAVE
	68	help
	69	Use the CPUFreq governor 'powersave' as default. This sets
	70	the frequency statically to the lowest frequency supported by
	71	the CPU.
	72
1da177e4 LT	73	config CPU_FREQ_DEFAULT_GOV_USERSPACE
	74	bool "userspace"
	75	select CPU_FREQ_GOV_USERSPACE
	76	help
	77	Use the CPUFreq governor 'userspace' as default. This allows
0211a9c8	78	you to set the CPU frequency manually or when a userspace
1da177e4 LT	79	program shall be able to set the CPU dynamically without having
	80	to enable the userspace governor manually.
	81
1c256245 TR	82	config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	83	bool "ondemand"
	84	select CPU_FREQ_GOV_ONDEMAND
	85	select CPU_FREQ_GOV_PERFORMANCE
	86	help
	87	Use the CPUFreq governor 'ondemand' as default. This allows
	88	you to get a full dynamic frequency capable system by simply
	89	loading your cpufreq low-level hardware driver.
	90	Be aware that not all cpufreq drivers support the ondemand
	91	governor. If unsure have a look at the help section of the
	92	driver. Fallback governor will be the performance governor.
	93
	94	config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	95	bool "conservative"
	96	select CPU_FREQ_GOV_CONSERVATIVE
	97	select CPU_FREQ_GOV_PERFORMANCE
	98	help
	99	Use the CPUFreq governor 'conservative' as default. This allows
	100	you to get a full dynamic frequency capable system by simply
	101	loading your cpufreq low-level hardware driver.
	102	Be aware that not all cpufreq drivers support the conservative
	103	governor. If unsure have a look at the help section of the
	104	driver. Fallback governor will be the performance governor.
1da177e4 LT	105	endchoice
	106
	107	config CPU_FREQ_GOV_PERFORMANCE
9101be53 MF	108	tristate "'performance' governor"
9101be53 MF	109	help
1da177e4 LT	110	This cpufreq governor sets the frequency statically to the
	111	highest available CPU frequency.
	112
9101be53 MF	113	To compile this driver as a module, choose M here: the
	114	module will be called cpufreq_performance.
	115
1da177e4 LT	116	If in doubt, say Y.
	117
	118	config CPU_FREQ_GOV_POWERSAVE
9101be53 MF	119	tristate "'powersave' governor"
9101be53 MF	120	help
1da177e4 LT	121	This cpufreq governor sets the frequency statically to the
	122	lowest available CPU frequency.
	123
9101be53 MF	124	To compile this driver as a module, choose M here: the
	125	module will be called cpufreq_powersave.
	126
1da177e4 LT	127	If in doubt, say Y.
	128
	129	config CPU_FREQ_GOV_USERSPACE
9101be53 MF	130	tristate "'userspace' governor for userspace frequency scaling"
9101be53 MF	131	help
1da177e4	132	Enable this cpufreq governor when you either want to set the
0211a9c8	133	CPU frequency manually or when a userspace program shall
1da177e4	134	be able to set the CPU dynamically, like on LART
4c41251e	135	<http://www.lartmaker.nl/>.
1da177e4	136
9101be53 MF	137	To compile this driver as a module, choose M here: the
	138	module will be called cpufreq_userspace.
	139
1da177e4 LT	140	For details, take a look at <file:Documentation/cpu-freq/>.
	141
	142	If in doubt, say Y.
	143
	144	config CPU_FREQ_GOV_ONDEMAND
	145	tristate "'ondemand' cpufreq policy governor"
1e15f295	146	select CPU_FREQ_GOV_COMMON
1da177e4 LT	147	help
	148	'ondemand' - This driver adds a dynamic cpufreq policy governor.
	149	The governor does a periodic polling and
	150	changes frequency based on the CPU utilization.
	151	The support for this governor depends on CPU capability to
	152	do fast frequency switching (i.e, very low latency frequency
	153	transitions).
	154
9101be53 MF	155	To compile this driver as a module, choose M here: the
	156	module will be called cpufreq_ondemand.
	157
1da177e4 LT	158	For details, take a look at linux/Documentation/cpu-freq.
	159
	160	If in doubt, say N.
	161
b9170836 DJ	162	config CPU_FREQ_GOV_CONSERVATIVE
	163	tristate "'conservative' cpufreq governor"
	164	depends on CPU_FREQ
1e15f295	165	select CPU_FREQ_GOV_COMMON
b9170836 DJ	166	help
	167	'conservative' - this driver is rather similar to the 'ondemand'
	168	governor both in its source code and its purpose, the difference is
	169	its optimisation for better suitability in a battery powered
	170	environment. The frequency is gracefully increased and decreased
	171	rather than jumping to 100% when speed is required.
	172
	173	If you have a desktop machine then you should really be considering
	174	the 'ondemand' governor instead, however if you are using a laptop,
	175	PDA or even an AMD64 based computer (due to the unacceptable
	176	step-by-step latency issues between the minimum and maximum frequency
	177	transitions in the CPU) you will probably want to use this governor.
	178
9101be53 MF	179	To compile this driver as a module, choose M here: the
	180	module will be called cpufreq_conservative.
	181
b9170836 DJ	182	For details, take a look at linux/Documentation/cpu-freq.
	183
	184	If in doubt, say N.
	185
95ceafd4	186	config GENERIC_CPUFREQ_CPU0
5553f9e2	187	tristate "Generic CPU0 cpufreq driver"
5fbfbcd3	188	depends on HAVE_CLK && OF
217886d3 AB	189	# if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
217886d3 AB	190	depends on !CPU_THERMAL \|\| THERMAL
109df086	191	select PM_OPP
95ceafd4 SG	192	help
	193	This adds a generic cpufreq driver for CPU0 frequency management.
	194	It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	195	systems which share clock and voltage across all CPUs.
	196
	197	If in doubt, say N.
	198
bb0a56ec DJ	199	menu "x86 CPU frequency scaling drivers"
	200	depends on X86
	201	source "drivers/cpufreq/Kconfig.x86"
	202	endmenu
	203
f7d77079	204	menu "ARM CPU frequency scaling drivers"
addea9ef	205	depends on ARM \|\| ARM64
f7d77079 KK	206	source "drivers/cpufreq/Kconfig.arm"
	207	endmenu
	208
81c720c9 VK	209	menu "AVR32 CPU frequency scaling drivers"
	210	depends on AVR32
	211
	212	config AVR32_AT32AP_CPUFREQ
	213	bool "CPU frequency driver for AT32AP"
	214	depends on PLATFORM_AT32AP
	215	default n
	216	help
	217	This enables the CPU frequency driver for AT32AP processors.
	218	If in doubt, say N.
	219
	220	endmenu
	221
ab423e43 VK	222	menu "CPUFreq processor drivers"
	223	depends on IA64
	224
	225	config IA64_ACPI_CPUFREQ
	226	tristate "ACPI Processor P-States driver"
ab423e43 VK	227	depends on ACPI_PROCESSOR
	228	help
	229	This driver adds a CPUFreq driver which utilizes the ACPI
	230	Processor Performance States.
	231
	232	For details, take a look at <file:Documentation/cpu-freq/>.
	233
	234	If in doubt, say N.
	235
	236	endmenu
	237
7a998935 VK	238	menu "MIPS CPUFreq processor drivers"
	239	depends on MIPS
	240
	241	config LOONGSON2_CPUFREQ
	242	tristate "Loongson2 CPUFreq Driver"
7a998935 VK	243	help
	244	This option adds a CPUFreq driver for loongson processors which
	245	support software configurable cpu frequency.
	246
	247	Loongson2F and it's successors support this feature.
	248
	249	For details, take a look at <file:Documentation/cpu-freq/>.
	250
	251	If in doubt, say N.
	252
	253	endmenu
	254
5d8c6658 DES	255	menu "PowerPC CPU frequency scaling drivers"
	256	depends on PPC32 \|\| PPC64
	257	source "drivers/cpufreq/Kconfig.powerpc"
	258	endmenu
	259
764295ae VK	260	menu "SPARC CPU frequency scaling drivers"
	261	depends on SPARC64
	262	config SPARC_US3_CPUFREQ
	263	tristate "UltraSPARC-III CPU Frequency driver"
764295ae VK	264	help
	265	This adds the CPUFreq driver for UltraSPARC-III processors.
	266
	267	For details, take a look at <file:Documentation/cpu-freq>.
	268
	269	If in doubt, say N.
	270
	271	config SPARC_US2E_CPUFREQ
	272	tristate "UltraSPARC-IIe CPU Frequency driver"
764295ae VK	273	help
	274	This adds the CPUFreq driver for UltraSPARC-IIe processors.
	275
	276	For details, take a look at <file:Documentation/cpu-freq>.
	277
	278	If in doubt, say N.
	279	endmenu
	280
7258267e VK	281	menu "SH CPU Frequency scaling"
	282	depends on SUPERH
	283	config SH_CPU_FREQ
	284	tristate "SuperH CPU Frequency driver"
7258267e VK	285	help
	286	This adds the cpufreq driver for SuperH. Any CPU that supports
	287	clock rate rounding through the clock framework can use this
	288	driver. While it will make the kernel slightly larger, this is
	289	harmless for CPUs that don't support rate rounding. The driver
	290	will also generate a notice in the boot log before disabling
	291	itself if the CPU in question is not capable of rate rounding.
	292
	293	For details, take a look at <file:Documentation/cpu-freq>.
	294
	295	If unsure, say N.
	296	endmenu
	297
bb0a56ec DJ	298	endif
bb0a56ec DJ	299	endmenu