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a3c98b8b MH |
1 | menuconfig PM_DEVFREQ |
2 | bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support" | |
83fe27ea | 3 | select SRCU |
b9c69e04 | 4 | select PM_OPP |
a3c98b8b | 5 | help |
6c81f905 MH |
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. | |
a3c98b8b | 10 | |
6c81f905 | 11 | Each device may have its own governor and policy. Devfreq can |
a3c98b8b | 12 | reevaluate the device state periodically and/or based on the |
6c81f905 | 13 | notification to "nb", a notifier block, of devfreq. |
a3c98b8b | 14 | |
6c81f905 | 15 | Like some CPUs with CPUfreq, a device may have multiple clocks. |
a3c98b8b | 16 | However, because the clock frequencies of a single device are |
6c81f905 | 17 | determined by the single device's state, an instance of devfreq |
a3c98b8b | 18 | is attached to a single device and returns a "representative" |
6c81f905 MH |
19 | clock frequency of the device, which is also attached |
20 | to a device by 1-to-1. The device registering devfreq takes the | |
6b2aac42 | 21 | responsibility to "interpret" the representative frequency and |
a3c98b8b | 22 | to set its every clock accordingly with the "target" callback |
6c81f905 MH |
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. | |
a3c98b8b MH |
29 | |
30 | if PM_DEVFREQ | |
31 | ||
ce26c5bb MH |
32 | comment "DEVFREQ Governors" |
33 | ||
34 | config DEVFREQ_GOV_SIMPLE_ONDEMAND | |
eff607fd | 35 | tristate "Simple Ondemand" |
ce26c5bb MH |
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 | ||
43 | config DEVFREQ_GOV_PERFORMANCE | |
eff607fd | 44 | tristate "Performance" |
ce26c5bb MH |
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 | ||
51 | config DEVFREQ_GOV_POWERSAVE | |
eff607fd | 52 | tristate "Powersave" |
ce26c5bb MH |
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 | ||
59 | config DEVFREQ_GOV_USERSPACE | |
eff607fd | 60 | tristate "Userspace" |
ce26c5bb MH |
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. | |
027b6934 | 65 | Otherwise, the governor does not change the frequency |
ce26c5bb MH |
66 | given at the initialization. |
67 | ||
99613311 CC |
68 | config 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 | ||
a3c98b8b MH |
76 | comment "DEVFREQ Drivers" |
77 | ||
0722249a | 78 | config ARM_EXYNOS_BUS_DEVFREQ |
5b3c316c | 79 | tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver" |
797da559 | 80 | depends on ARCH_EXYNOS || COMPILE_TEST |
0722249a | 81 | select DEVFREQ_GOV_SIMPLE_ONDEMAND |
403e0689 | 82 | select DEVFREQ_GOV_PASSIVE |
0722249a CC |
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 | ||
6234f380 | 94 | config ARM_TEGRA_DEVFREQ |
989a0fc7 | 95 | tristate "Tegra DEVFREQ Driver" |
290128ac | 96 | depends on ARCH_TEGRA_124_SOC |
989a0fc7 JZ |
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. | |
6234f380 | 103 | |
5a893e31 LH |
104 | config 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 | |
54dec69b | 109 | select PM_DEVFREQ_EVENT |
5a893e31 LH |
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 | ||
f262f28c CC |
116 | source "drivers/devfreq/event/Kconfig" |
117 | ||
a3c98b8b | 118 | endif # PM_DEVFREQ |