drivers/cpufreq/Kconfig - arm/linux - Git at Google

 menu "CPU Frequency scaling"

 config CPU_FREQ
 	bool "CPU Frequency scaling"
 	select SRCU
 	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_ATTR_SET
 	bool

 config CPU_FREQ_GOV_COMMON
 	select CPU_FREQ_GOV_ATTR_SET
 	select IRQ_WORK
 	bool

 config CPU_FREQ_BOOST_SW
 	bool
 	depends on THERMAL

 config CPU_FREQ_STAT
 	bool "CPU frequency transition statistics"
 	help
 	  Export CPU frequency statistics information through sysfs.

 	  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.

 config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
 	bool "schedutil"
 	depends on SMP
 	select CPU_FREQ_GOV_SCHEDUTIL
 	select CPU_FREQ_GOV_PERFORMANCE
 	help
 	  Use the 'schedutil' CPUFreq governor by default. If unsure,
 	  have a look at the help section of that governor. The fallback
 	  governor will be 'performance'.

 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 CPU_FREQ_GOV_SCHEDUTIL
 	bool "'schedutil' cpufreq policy governor"
 	depends on CPU_FREQ && SMP
 	select CPU_FREQ_GOV_ATTR_SET
 	select IRQ_WORK
 	help
 	  This governor makes decisions based on the utilization data provided
 	  by the scheduler.  It sets the CPU frequency to be proportional to
 	  the utilization/capacity ratio coming from the scheduler.  If the
 	  utilization is frequency-invariant, the new frequency is also
 	  proportional to the maximum available frequency.  If that is not the
 	  case, it is proportional to the current frequency of the CPU.  The
 	  frequency tipping point is at utilization/capacity equal to 80% in
 	  both cases.

 	  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 CPUFREQ_DT_PLATDEV
 	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.

 	  If in doubt, say N.

 config CPUFREQ_DT_PLATDEV
 	bool
 	help
 	  This adds a generic DT based cpufreq platdev driver for frequency
 	  management.  This creates a 'cpufreq-dt' platform device, on the
 	  supported platforms.

 	  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 BMIPS_CPUFREQ
 	tristate "BMIPS CPUfreq Driver"
 	help
 	  This option adds a CPUfreq driver for BMIPS processors with
 	  support for configurable CPU frequency.

 	  For now, BMIPS5 chips are supported (such as the Broadcom 7425).

 	  If in doubt, say N.

 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

 config QORIQ_CPUFREQ
 	tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
 	depends on OF && COMMON_CLK && (PPC_E500MC || ARM || ARM64)
 	depends on !CPU_THERMAL || THERMAL
 	select CLK_QORIQ
 	help
 	  This adds the CPUFreq driver support for Freescale QorIQ SoCs
 	  which are capable of changing the CPU's frequency dynamically.

 endif
 endmenu
	menu "CPU Frequency scaling"

	config CPU_FREQ
	bool "CPU Frequency scaling"
	select SRCU
	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_ATTR_SET
	bool

	config CPU_FREQ_GOV_COMMON
	select CPU_FREQ_GOV_ATTR_SET
	select IRQ_WORK
	bool

	config CPU_FREQ_BOOST_SW
	bool
	depends on THERMAL

	config CPU_FREQ_STAT
	bool "CPU frequency transition statistics"
	help
	Export CPU frequency statistics information through sysfs.

	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.

	config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
	bool "schedutil"
	depends on SMP
	select CPU_FREQ_GOV_SCHEDUTIL
	select CPU_FREQ_GOV_PERFORMANCE
	help
	Use the 'schedutil' CPUFreq governor by default. If unsure,
	have a look at the help section of that governor. The fallback
	governor will be 'performance'.

	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 CPU_FREQ_GOV_SCHEDUTIL
	bool "'schedutil' cpufreq policy governor"
	depends on CPU_FREQ && SMP
	select CPU_FREQ_GOV_ATTR_SET
	select IRQ_WORK
	help
	This governor makes decisions based on the utilization data provided
	by the scheduler. It sets the CPU frequency to be proportional to
	the utilization/capacity ratio coming from the scheduler. If the
	utilization is frequency-invariant, the new frequency is also
	proportional to the maximum available frequency. If that is not the
	case, it is proportional to the current frequency of the CPU. The
	frequency tipping point is at utilization/capacity equal to 80% in
	both cases.

	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 CPUFREQ_DT_PLATDEV
	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.

	If in doubt, say N.

	config CPUFREQ_DT_PLATDEV
	bool
	help
	This adds a generic DT based cpufreq platdev driver for frequency
	management. This creates a 'cpufreq-dt' platform device, on the
	supported platforms.

	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 BMIPS_CPUFREQ
	tristate "BMIPS CPUfreq Driver"
	help
	This option adds a CPUfreq driver for BMIPS processors with
	support for configurable CPU frequency.

	For now, BMIPS5 chips are supported (such as the Broadcom 7425).

	If in doubt, say N.

	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

	config QORIQ_CPUFREQ
	tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
	depends on OF && COMMON_CLK && (PPC_E500MC \|\| ARM \|\| ARM64)
	depends on !CPU_THERMAL \|\| THERMAL
	select CLK_QORIQ
	help
	This adds the CPUFreq driver support for Freescale QorIQ SoCs
	which are capable of changing the CPU's frequency dynamically.

	endif
	endmenu