[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_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"
	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.

comment "CPU frequency scaling drivers"

config CPUFREQ_DT
	tristate "Generic DT based cpufreq driver"
	depends on HAVE_CLK && OF
	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
	depends on !CPU_THERMAL || THERMAL
	select PM_OPP
	help
	  This adds a generic DT based cpufreq driver for 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.

if X86
source "drivers/cpufreq/Kconfig.x86"
endif

if ARM || ARM64
source "drivers/cpufreq/Kconfig.arm"
endif

if PPC32 || PPC64
source "drivers/cpufreq/Kconfig.powerpc"
endif

if 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.
endif

if 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.
endif

if 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.

config LOONGSON1_CPUFREQ
	tristate "Loongson1 CPUFreq Driver"
	help
	  This option adds a CPUFreq driver for loongson1 processors which
	  support software configurable cpu frequency.

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

	  If in doubt, say N.
endif

if 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.
endif

if 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.
endif

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"
30d221db AG	66	select CPU_FREQ_GOV_POWERSAVE
	67	help
	68	Use the CPUFreq governor 'powersave' as default. This sets
	69	the frequency statically to the lowest frequency supported by
	70	the CPU.
	71
1da177e4 LT	72	config CPU_FREQ_DEFAULT_GOV_USERSPACE
	73	bool "userspace"
	74	select CPU_FREQ_GOV_USERSPACE
	75	help
	76	Use the CPUFreq governor 'userspace' as default. This allows
0211a9c8	77	you to set the CPU frequency manually or when a userspace
1da177e4 LT	78	program shall be able to set the CPU dynamically without having
	79	to enable the userspace governor manually.
	80
1c256245 TR	81	config CPU_FREQ_DEFAULT_GOV_ONDEMAND
	82	bool "ondemand"
	83	select CPU_FREQ_GOV_ONDEMAND
	84	select CPU_FREQ_GOV_PERFORMANCE
	85	help
	86	Use the CPUFreq governor 'ondemand' as default. This allows
	87	you to get a full dynamic frequency capable system by simply
	88	loading your cpufreq low-level hardware driver.
	89	Be aware that not all cpufreq drivers support the ondemand
	90	governor. If unsure have a look at the help section of the
	91	driver. Fallback governor will be the performance governor.
	92
	93	config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
	94	bool "conservative"
	95	select CPU_FREQ_GOV_CONSERVATIVE
	96	select CPU_FREQ_GOV_PERFORMANCE
	97	help
	98	Use the CPUFreq governor 'conservative' as default. This allows
	99	you to get a full dynamic frequency capable system by simply
	100	loading your cpufreq low-level hardware driver.
	101	Be aware that not all cpufreq drivers support the conservative
	102	governor. If unsure have a look at the help section of the
	103	driver. Fallback governor will be the performance governor.
1da177e4 LT	104	endchoice
	105
	106	config CPU_FREQ_GOV_PERFORMANCE
9101be53 MF	107	tristate "'performance' governor"
9101be53 MF	108	help
1da177e4 LT	109	This cpufreq governor sets the frequency statically to the
	110	highest available CPU frequency.
	111
9101be53 MF	112	To compile this driver as a module, choose M here: the
	113	module will be called cpufreq_performance.
	114
1da177e4 LT	115	If in doubt, say Y.
	116
	117	config CPU_FREQ_GOV_POWERSAVE
9101be53 MF	118	tristate "'powersave' governor"
9101be53 MF	119	help
1da177e4 LT	120	This cpufreq governor sets the frequency statically to the
	121	lowest available CPU frequency.
	122
9101be53 MF	123	To compile this driver as a module, choose M here: the
	124	module will be called cpufreq_powersave.
	125
1da177e4 LT	126	If in doubt, say Y.
	127
	128	config CPU_FREQ_GOV_USERSPACE
9101be53 MF	129	tristate "'userspace' governor for userspace frequency scaling"
9101be53 MF	130	help
1da177e4	131	Enable this cpufreq governor when you either want to set the
0211a9c8	132	CPU frequency manually or when a userspace program shall
1da177e4	133	be able to set the CPU dynamically, like on LART
4c41251e	134	<http://www.lartmaker.nl/>.
1da177e4	135
9101be53 MF	136	To compile this driver as a module, choose M here: the
	137	module will be called cpufreq_userspace.
	138
1da177e4 LT	139	For details, take a look at <file:Documentation/cpu-freq/>.
	140
	141	If in doubt, say Y.
	142
	143	config CPU_FREQ_GOV_ONDEMAND
	144	tristate "'ondemand' cpufreq policy governor"
1e15f295	145	select CPU_FREQ_GOV_COMMON
1da177e4 LT	146	help
	147	'ondemand' - This driver adds a dynamic cpufreq policy governor.
	148	The governor does a periodic polling and
	149	changes frequency based on the CPU utilization.
	150	The support for this governor depends on CPU capability to
	151	do fast frequency switching (i.e, very low latency frequency
	152	transitions).
	153
9101be53 MF	154	To compile this driver as a module, choose M here: the
	155	module will be called cpufreq_ondemand.
	156
1da177e4 LT	157	For details, take a look at linux/Documentation/cpu-freq.
	158
	159	If in doubt, say N.
	160
b9170836 DJ	161	config CPU_FREQ_GOV_CONSERVATIVE
	162	tristate "'conservative' cpufreq governor"
	163	depends on CPU_FREQ
1e15f295	164	select CPU_FREQ_GOV_COMMON
b9170836 DJ	165	help
	166	'conservative' - this driver is rather similar to the 'ondemand'
	167	governor both in its source code and its purpose, the difference is
	168	its optimisation for better suitability in a battery powered
	169	environment. The frequency is gracefully increased and decreased
	170	rather than jumping to 100% when speed is required.
	171
	172	If you have a desktop machine then you should really be considering
	173	the 'ondemand' governor instead, however if you are using a laptop,
	174	PDA or even an AMD64 based computer (due to the unacceptable
	175	step-by-step latency issues between the minimum and maximum frequency
	176	transitions in the CPU) you will probably want to use this governor.
	177
9101be53 MF	178	To compile this driver as a module, choose M here: the
	179	module will be called cpufreq_conservative.
	180
b9170836 DJ	181	For details, take a look at linux/Documentation/cpu-freq.
	182
	183	If in doubt, say N.
	184
f41f4815 VK	185	comment "CPU frequency scaling drivers"
f41f4815 VK	186
bbcf0719 VK	187	config CPUFREQ_DT
bbcf0719 VK	188	tristate "Generic DT based cpufreq driver"
5fbfbcd3	189	depends on HAVE_CLK && OF
bbcf0719	190	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
217886d3	191	depends on !CPU_THERMAL \|\| THERMAL
109df086	192	select PM_OPP
95ceafd4	193	help
bbcf0719	194	This adds a generic DT based cpufreq driver for frequency management.
95ceafd4 SG	195	It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
	196	systems which share clock and voltage across all CPUs.
	197
	198	If in doubt, say N.
	199
f41f4815	200	if X86
bb0a56ec	201	source "drivers/cpufreq/Kconfig.x86"
f41f4815	202	endif
bb0a56ec	203
f41f4815	204	if ARM \|\| ARM64
f7d77079	205	source "drivers/cpufreq/Kconfig.arm"
f41f4815	206	endif
f7d77079	207
f41f4815 VK	208	if PPC32 \|\| PPC64
	209	source "drivers/cpufreq/Kconfig.powerpc"
	210	endif
81c720c9	211
f41f4815	212	if AVR32
81c720c9 VK	213	config AVR32_AT32AP_CPUFREQ
	214	bool "CPU frequency driver for AT32AP"
	215	depends on PLATFORM_AT32AP
	216	default n
	217	help
	218	This enables the CPU frequency driver for AT32AP processors.
	219	If in doubt, say N.
f41f4815	220	endif
81c720c9	221
f41f4815	222	if IA64
ab423e43 VK	223	config IA64_ACPI_CPUFREQ
ab423e43 VK	224	tristate "ACPI Processor P-States driver"
ab423e43 VK	225	depends on ACPI_PROCESSOR
	226	help
	227	This driver adds a CPUFreq driver which utilizes the ACPI
	228	Processor Performance States.
	229
	230	For details, take a look at <file:Documentation/cpu-freq/>.
	231
	232	If in doubt, say N.
f41f4815	233	endif
ab423e43	234
f41f4815	235	if MIPS
7a998935 VK	236	config LOONGSON2_CPUFREQ
7a998935 VK	237	tristate "Loongson2 CPUFreq Driver"
7a998935 VK	238	help
	239	This option adds a CPUFreq driver for loongson processors which
	240	support software configurable cpu frequency.
	241
	242	Loongson2F and it's successors support this feature.
	243
	244	For details, take a look at <file:Documentation/cpu-freq/>.
	245
	246	If in doubt, say N.
	247
a0a22cf1 KC	248	config LOONGSON1_CPUFREQ
	249	tristate "Loongson1 CPUFreq Driver"
	250	help
	251	This option adds a CPUFreq driver for loongson1 processors which
	252	support software configurable cpu frequency.
	253
	254	For details, take a look at <file:Documentation/cpu-freq/>.
	255
	256	If in doubt, say N.
f41f4815	257	endif
a0a22cf1	258
f41f4815	259	if SPARC64
764295ae VK	260	config SPARC_US3_CPUFREQ
764295ae VK	261	tristate "UltraSPARC-III CPU Frequency driver"
764295ae VK	262	help
	263	This adds the CPUFreq driver for UltraSPARC-III processors.
	264
	265	For details, take a look at <file:Documentation/cpu-freq>.
	266
	267	If in doubt, say N.
	268
	269	config SPARC_US2E_CPUFREQ
	270	tristate "UltraSPARC-IIe CPU Frequency driver"
764295ae VK	271	help
	272	This adds the CPUFreq driver for UltraSPARC-IIe processors.
	273
	274	For details, take a look at <file:Documentation/cpu-freq>.
	275
	276	If in doubt, say N.
f41f4815	277	endif
764295ae	278
f41f4815	279	if SUPERH
7258267e VK	280	config SH_CPU_FREQ
7258267e VK	281	tristate "SuperH CPU Frequency driver"
7258267e VK	282	help
	283	This adds the cpufreq driver for SuperH. Any CPU that supports
	284	clock rate rounding through the clock framework can use this
	285	driver. While it will make the kernel slightly larger, this is
	286	harmless for CPUs that don't support rate rounding. The driver
	287	will also generate a notice in the boot log before disabling
	288	itself if the CPU in question is not capable of rate rounding.
	289
	290	For details, take a look at <file:Documentation/cpu-freq>.
	291
	292	If unsure, say N.
f41f4815	293	endif
7258267e	294
bb0a56ec DJ	295	endif
bb0a56ec DJ	296	endmenu