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 frequnecy
65	  given at the initialization.
66
67comment "DEVFREQ Drivers"
68
69config ARM_EXYNOS4_BUS_DEVFREQ
70	bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
71	depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM
72	select DEVFREQ_GOV_SIMPLE_ONDEMAND
73	select PM_OPP
74	help
75	  This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
76	  and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
77	  It reads PPMU counters of memory controllers and adjusts
78	  the operating frequencies and voltages with OPP support.
79	  This does not yet operate with optimal voltages.
80
81config ARM_EXYNOS5_BUS_DEVFREQ
82	tristate "ARM Exynos5250 Bus DEVFREQ Driver"
83	depends on SOC_EXYNOS5250
84	select DEVFREQ_GOV_SIMPLE_ONDEMAND
85	select PM_OPP
86	help
87	  This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int).
88	  It reads PPMU counters of memory controllers and adjusts the
89	  operating frequencies and voltages with OPP support.
90
91config ARM_TEGRA_DEVFREQ
92       tristate "Tegra DEVFREQ Driver"
93       depends on ARCH_TEGRA_124_SOC
94       select DEVFREQ_GOV_SIMPLE_ONDEMAND
95       select PM_OPP
96       help
97         This adds the DEVFREQ driver for the Tegra family of SoCs.
98         It reads ACTMON counters of memory controllers and adjusts the
99         operating frequencies and voltages with OPP support.
100
101source "drivers/devfreq/event/Kconfig"
102
103endif # PM_DEVFREQ
104