# SPDX-License-Identifier: GPL-2.0-onlymenuconfig 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/.../userspace/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	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_IMX_BUS_DEVFREQ	tristate "i.MX Generic Bus DEVFREQ Driver"	depends on ARCH_MXC || COMPILE_TEST	select DEVFREQ_GOV_USERSPACE	help	  This adds the generic DEVFREQ driver for i.MX interconnects. It	  allows adjusting NIC/NOC frequency. config ARM_IMX8M_DDRC_DEVFREQ	tristate "i.MX8M DDRC DEVFREQ Driver"	depends on (ARCH_MXC && HAVE_ARM_SMCCC) || \		(COMPILE_TEST && HAVE_ARM_SMCCC)	select DEVFREQ_GOV_USERSPACE	help	  This adds the DEVFREQ driver for the i.MX8M DDR Controller. It allows	  adjusting DRAM frequency. 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	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_MEDIATEK_CCI_DEVFREQ	tristate "MEDIATEK CCI DEVFREQ Driver"	depends on ARM_MEDIATEK_CPUFREQ || COMPILE_TEST	select DEVFREQ_GOV_PASSIVE	help	  This adds a devfreq driver for MediaTek Cache Coherent Interconnect	  which is shared the same regulators with the cpu cluster. It can track	  buck voltages and update a proper CCI frequency. Use the notification	  to get the regulator status. 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	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. config ARM_SUN8I_A33_MBUS_DEVFREQ	tristate "sun8i/sun50i MBUS DEVFREQ Driver"	depends on ARCH_SUNXI || COMPILE_TEST	depends on COMMON_CLK	select DEVFREQ_GOV_SIMPLE_ONDEMAND	help	  This adds the DEVFREQ driver for the MBUS controller in some	  Allwinner sun8i (A33 through H3) and sun50i (A64 and H5) SoCs. source "drivers/devfreq/event/Kconfig" endif # PM_DEVFREQ