Git Repo - linux.git/blame_incremental - drivers/devfreq/Kconfig

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Commit	Line	Data
	1	menuconfig PM_DEVFREQ
	2	bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
	3	select SRCU
	4	help
	5	A device may have a list of frequencies and voltages available.
	6	devfreq, a generic DVFS framework can be registered for a device
	7	in order to let the governor provided to devfreq choose an
	8	operating frequency based on the device driver's policy.
	9
	10	Each device may have its own governor and policy. Devfreq can
	11	reevaluate the device state periodically and/or based on the
	12	notification to "nb", a notifier block, of devfreq.
	13
	14	Like some CPUs with CPUfreq, a device may have multiple clocks.
	15	However, because the clock frequencies of a single device are
	16	determined by the single device's state, an instance of devfreq
	17	is attached to a single device and returns a "representative"
	18	clock frequency of the device, which is also attached
	19	to a device by 1-to-1. The device registering devfreq takes the
	20	responsibility to "interpret" the representative frequency and
	21	to set its every clock accordingly with the "target" callback
	22	given to devfreq.
	23
	24	When OPP is used with the devfreq device, it is recommended to
	25	register devfreq's nb to the OPP's notifier head. If OPP is
	26	used with the devfreq device, you may use OPP helper
	27	functions defined in devfreq.h.
	28
	29	if PM_DEVFREQ
	30
	31	comment "DEVFREQ Governors"
	32
	33	config DEVFREQ_GOV_SIMPLE_ONDEMAND
	34	tristate "Simple Ondemand"
	35	help
	36	Chooses frequency based on the recent load on the device. Works
	37	similar as ONDEMAND governor of CPUFREQ does. A device with
	38	Simple-Ondemand should be able to provide busy/total counter
	39	values that imply the usage rate. A device may provide tuned
	40	values to the governor with data field at devfreq_add_device().
	41
	42	config DEVFREQ_GOV_PERFORMANCE
	43	tristate "Performance"
	44	help
	45	Sets the frequency at the maximum available frequency.
	46	This governor always returns UINT_MAX as frequency so that
	47	the DEVFREQ framework returns the highest frequency available
	48	at any time.
	49
	50	config DEVFREQ_GOV_POWERSAVE
	51	tristate "Powersave"
	52	help
	53	Sets the frequency at the minimum available frequency.
	54	This governor always returns 0 as frequency so that
	55	the DEVFREQ framework returns the lowest frequency available
	56	at any time.
	57
	58	config DEVFREQ_GOV_USERSPACE
	59	tristate "Userspace"
	60	help
	61	Sets the frequency at the user specified one.
	62	This governor returns the user configured frequency if there
	63	has been an input to /sys/devices/.../power/devfreq_set_freq.
	64	Otherwise, the governor does not change the frequency
	65	given at the initialization.
	66
	67	config DEVFREQ_GOV_PASSIVE
	68	tristate "Passive"
	69	help
	70	Sets the frequency based on the frequency of its parent devfreq
	71	device. This governor does not change the frequency by itself
	72	through sysfs entries. The passive governor recommends that
	73	devfreq device uses the OPP table to get the frequency/voltage.
	74
	75	comment "DEVFREQ Drivers"
	76
	77	config ARM_EXYNOS_BUS_DEVFREQ
	78	tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
	79	depends on ARCH_EXYNOS \|\| COMPILE_TEST
	80	select DEVFREQ_GOV_SIMPLE_ONDEMAND
	81	select DEVFREQ_GOV_PASSIVE
	82	select DEVFREQ_EVENT_EXYNOS_PPMU
	83	select PM_DEVFREQ_EVENT
	84	select PM_OPP
	85	help
	86	This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
	87	Memory bus has one more group of memory bus (e.g, MIF and INT block).
	88	Each memory bus group could contain many memoby bus block. It reads
	89	PPMU counters of memory controllers by using DEVFREQ-event device
	90	and adjusts the operating frequencies and voltages with OPP support.
	91	This does not yet operate with optimal voltages.
	92
	93	config ARM_TEGRA_DEVFREQ
	94	tristate "Tegra DEVFREQ Driver"
	95	depends on ARCH_TEGRA_124_SOC
	96	select DEVFREQ_GOV_SIMPLE_ONDEMAND
	97	select PM_OPP
	98	help
	99	This adds the DEVFREQ driver for the Tegra family of SoCs.
	100	It reads ACTMON counters of memory controllers and adjusts the
	101	operating frequencies and voltages with OPP support.
	102
	103	config ARM_RK3399_DMC_DEVFREQ
	104	tristate "ARM RK3399 DMC DEVFREQ Driver"
	105	depends on ARCH_ROCKCHIP
	106	select DEVFREQ_EVENT_ROCKCHIP_DFI
	107	select DEVFREQ_GOV_SIMPLE_ONDEMAND
	108	select PM_DEVFREQ_EVENT
	109	select PM_OPP
	110	help
	111	This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
	112	It sets the frequency for the memory controller and reads the usage counts
	113	from hardware.
	114
	115	source "drivers/devfreq/event/Kconfig"
	116
	117	endif # PM_DEVFREQ