xref: /openbmc/linux/drivers/devfreq/Kconfig (revision ba61bb17)
1menuconfig PM_DEVFREQ
2	bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
3	select SRCU
4	select PM_OPP
5	help
6	  A device may have a list of frequencies and voltages available.
7	  devfreq, a generic DVFS framework can be registered for a device
8	  in order to let the governor provided to devfreq choose an
9	  operating frequency based on the device driver's policy.
10
11	  Each device may have its own governor and policy. Devfreq can
12	  reevaluate the device state periodically and/or based on the
13	  notification to "nb", a notifier block, of devfreq.
14
15	  Like some CPUs with CPUfreq, a device may have multiple clocks.
16	  However, because the clock frequencies of a single device are
17	  determined by the single device's state, an instance of devfreq
18	  is attached to a single device and returns a "representative"
19	  clock frequency of the device, which is also attached
20	  to a device by 1-to-1. The device registering devfreq takes the
21	  responsibility to "interpret" the representative frequency and
22	  to set its every clock accordingly with the "target" callback
23	  given to devfreq.
24
25	  When OPP is used with the devfreq device, it is recommended to
26	  register devfreq's nb to the OPP's notifier head.  If OPP is
27	  used with the devfreq device, you may use OPP helper
28	  functions defined in devfreq.h.
29
30if PM_DEVFREQ
31
32comment "DEVFREQ Governors"
33
34config DEVFREQ_GOV_SIMPLE_ONDEMAND
35	tristate "Simple Ondemand"
36	help
37	  Chooses frequency based on the recent load on the device. Works
38	  similar as ONDEMAND governor of CPUFREQ does. A device with
39	  Simple-Ondemand should be able to provide busy/total counter
40	  values that imply the usage rate. A device may provide tuned
41	  values to the governor with data field at devfreq_add_device().
42
43config DEVFREQ_GOV_PERFORMANCE
44	tristate "Performance"
45	help
46	  Sets the frequency at the maximum available frequency.
47	  This governor always returns UINT_MAX as frequency so that
48	  the DEVFREQ framework returns the highest frequency available
49	  at any time.
50
51config DEVFREQ_GOV_POWERSAVE
52	tristate "Powersave"
53	help
54	  Sets the frequency at the minimum available frequency.
55	  This governor always returns 0 as frequency so that
56	  the DEVFREQ framework returns the lowest frequency available
57	  at any time.
58
59config DEVFREQ_GOV_USERSPACE
60	tristate "Userspace"
61	help
62	  Sets the frequency at the user specified one.
63	  This governor returns the user configured frequency if there
64	  has been an input to /sys/devices/.../power/devfreq_set_freq.
65	  Otherwise, the governor does not change the frequency
66	  given at the initialization.
67
68config DEVFREQ_GOV_PASSIVE
69	tristate "Passive"
70	help
71	  Sets the frequency based on the frequency of its parent devfreq
72	  device. This governor does not change the frequency by itself
73	  through sysfs entries. The passive governor recommends that
74	  devfreq device uses the OPP table to get the frequency/voltage.
75
76comment "DEVFREQ Drivers"
77
78config ARM_EXYNOS_BUS_DEVFREQ
79	tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
80	depends on ARCH_EXYNOS || COMPILE_TEST
81	select DEVFREQ_GOV_SIMPLE_ONDEMAND
82	select DEVFREQ_GOV_PASSIVE
83	select DEVFREQ_EVENT_EXYNOS_PPMU
84	select PM_DEVFREQ_EVENT
85	select PM_OPP
86	help
87	  This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
88	  Memory bus has one more group of memory bus (e.g, MIF and INT block).
89	  Each memory bus group could contain many memoby bus block. It reads
90	  PPMU counters of memory controllers by using DEVFREQ-event device
91	  and adjusts the operating frequencies and voltages with OPP support.
92	  This does not yet operate with optimal voltages.
93
94config ARM_TEGRA_DEVFREQ
95	tristate "Tegra DEVFREQ Driver"
96	depends on ARCH_TEGRA_124_SOC
97	select DEVFREQ_GOV_SIMPLE_ONDEMAND
98	select PM_OPP
99	help
100	  This adds the DEVFREQ driver for the Tegra family of SoCs.
101	  It reads ACTMON counters of memory controllers and adjusts the
102	  operating frequencies and voltages with OPP support.
103
104config ARM_RK3399_DMC_DEVFREQ
105	tristate "ARM RK3399 DMC DEVFREQ Driver"
106	depends on ARCH_ROCKCHIP
107	select DEVFREQ_EVENT_ROCKCHIP_DFI
108	select DEVFREQ_GOV_SIMPLE_ONDEMAND
109	select PM_DEVFREQ_EVENT
110	select PM_OPP
111	help
112          This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
113          It sets the frequency for the memory controller and reads the usage counts
114          from hardware.
115
116source "drivers/devfreq/event/Kconfig"
117
118endif # PM_DEVFREQ
119