diff options
Diffstat (limited to 'drivers/cpufreq/Kconfig')
| -rw-r--r-- | drivers/cpufreq/Kconfig | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig new file mode 100644 index 000000000..2a84fc633 --- /dev/null +++ b/drivers/cpufreq/Kconfig @@ -0,0 +1,325 @@ +# SPDX-License-Identifier: GPL-2.0-only +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/admin-guide/pm/cpufreq.rst>. + + 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_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_SCHEDUTIL if ARM64 || ARM + default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if X86_INTEL_PSTATE && SMP + default CPU_FREQ_DEFAULT_GOV_PERFORMANCE + help + This option sets which CPUFreq governor shall be loaded at + startup. If in doubt, use the default setting. + +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" + depends on !(X86_INTEL_PSTATE && SMP) + 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" + depends on !(X86_INTEL_PSTATE && SMP) + 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. + + 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 + <file:Documentation/admin-guide/pm/cpufreq.rst>. + + 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 + <file:Documentation/admin-guide/pm/cpufreq.rst>. + + 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 + 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 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. + + 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" + depends on LEMOTE_MACH2F + help + This option adds a CPUFreq driver for loongson processors which + support software configurable cpu frequency. + + Loongson2F and its successors support this feature. + + If in doubt, say N. + +config LOONGSON1_CPUFREQ + tristate "Loongson1 CPUFreq Driver" + depends on LOONGSON1_LS1B + help + This option adds a CPUFreq driver for loongson1 processors which + support software configurable cpu frequency. + + 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. + + 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. + + 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. + + If unsure, say N. +endif + +config QORIQ_CPUFREQ + tristate "CPU frequency scaling driver for Freescale QorIQ SoCs" + depends on OF && COMMON_CLK + depends on PPC_E500MC || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST + 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 |