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linux-headers-5.4.0-215
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devfreq
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# SPDX-License-Identifier: GPL-2.0-only menuconfig PM_DEVFREQ bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support" select SRCU select PM_OPP help A device may have a list of frequencies and voltages available. devfreq, a generic DVFS framework can be registered for a device in order to let the governor provided to devfreq choose an operating frequency based on the device driver's policy. Each device may have its own governor and policy. Devfreq can reevaluate the device state periodically and/or based on the notification to "nb", a notifier block, of devfreq. Like some CPUs with CPUfreq, a device may have multiple clocks. However, because the clock frequencies of a single device are determined by the single device's state, an instance of devfreq is attached to a single device and returns a "representative" clock frequency of the device, which is also attached to a device by 1-to-1. The device registering devfreq takes the responsibility to "interpret" the representative frequency and to set its every clock accordingly with the "target" callback given to devfreq. When OPP is used with the devfreq device, it is recommended to register devfreq's nb to the OPP's notifier head. If OPP is used with the devfreq device, you may use OPP helper functions defined in devfreq.h. if PM_DEVFREQ comment "DEVFREQ Governors" config DEVFREQ_GOV_SIMPLE_ONDEMAND tristate "Simple Ondemand" help Chooses frequency based on the recent load on the device. Works similar as ONDEMAND governor of CPUFREQ does. A device with Simple-Ondemand should be able to provide busy/total counter values that imply the usage rate. A device may provide tuned values to the governor with data field at devfreq_add_device(). config DEVFREQ_GOV_PERFORMANCE tristate "Performance" help Sets the frequency at the maximum available frequency. This governor always returns UINT_MAX as frequency so that the DEVFREQ framework returns the highest frequency available at any time. config DEVFREQ_GOV_POWERSAVE tristate "Powersave" help Sets the frequency at the minimum available frequency. This governor always returns 0 as frequency so that the DEVFREQ framework returns the lowest frequency available at any time. config DEVFREQ_GOV_USERSPACE tristate "Userspace" help Sets the frequency at the user specified one. This governor returns the user configured frequency if there has been an input to /sys/devices/.../power/devfreq_set_freq. Otherwise, the governor does not change the frequency given at the initialization. config DEVFREQ_GOV_PASSIVE tristate "Passive" help Sets the frequency based on the frequency of its parent devfreq device. This governor does not change the frequency by itself through sysfs entries. The passive governor recommends that devfreq device uses the OPP table to get the frequency/voltage. comment "DEVFREQ Drivers" config ARM_EXYNOS_BUS_DEVFREQ tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver" depends on ARCH_EXYNOS || COMPILE_TEST select DEVFREQ_GOV_SIMPLE_ONDEMAND select DEVFREQ_GOV_PASSIVE select DEVFREQ_EVENT_EXYNOS_PPMU select PM_DEVFREQ_EVENT select PM_OPP help This adds the common DEVFREQ driver for Exynos Memory bus. Exynos Memory bus has one more group of memory bus (e.g, MIF and INT block). Each memory bus group could contain many memoby bus block. It reads PPMU counters of memory controllers by using DEVFREQ-event device and adjusts the operating frequencies and voltages with OPP support. This does not yet operate with optimal voltages. config ARM_TEGRA_DEVFREQ tristate "NVIDIA Tegra30/114/124/210 DEVFREQ Driver" depends on ARCH_TEGRA_3x_SOC || ARCH_TEGRA_114_SOC || \ ARCH_TEGRA_132_SOC || ARCH_TEGRA_124_SOC || \ ARCH_TEGRA_210_SOC || \ COMPILE_TEST select PM_OPP depends on COMMON_CLK help This adds the DEVFREQ driver for the Tegra family of SoCs. It reads ACTMON counters of memory controllers and adjusts the operating frequencies and voltages with OPP support. config ARM_TEGRA20_DEVFREQ tristate "NVIDIA Tegra20 DEVFREQ Driver" depends on (TEGRA_MC && TEGRA20_EMC) || COMPILE_TEST depends on COMMON_CLK select DEVFREQ_GOV_SIMPLE_ONDEMAND select PM_OPP help This adds the DEVFREQ driver for the Tegra20 family of SoCs. It reads Memory Controller counters and adjusts the operating frequencies and voltages with OPP support. config ARM_RK3399_DMC_DEVFREQ tristate "ARM RK3399 DMC DEVFREQ Driver" depends on (ARCH_ROCKCHIP && HAVE_ARM_SMCCC) || \ (COMPILE_TEST && HAVE_ARM_SMCCC) select DEVFREQ_EVENT_ROCKCHIP_DFI select DEVFREQ_GOV_SIMPLE_ONDEMAND select PM_DEVFREQ_EVENT select PM_OPP help This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller). It sets the frequency for the memory controller and reads the usage counts from hardware. source "drivers/devfreq/event/Kconfig" endif # PM_DEVFREQ