xref: /openbmc/linux/drivers/devfreq/Kconfig (revision 4562236b)
1menuconfig 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
29if PM_DEVFREQ
30
31comment "DEVFREQ Governors"
32
33config 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
42config 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
50config 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
58config 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
67config 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
75comment "DEVFREQ Drivers"
76
77config 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
93config 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
103config 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
115source "drivers/devfreq/event/Kconfig"
116
117endif # PM_DEVFREQ
118