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MyungJoo Hama3c98b82011-10-02 00:19:15 +02001menuconfig PM_DEVFREQ
2 bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
Pranith Kumar83fe27e2014-12-05 11:24:45 -05003 select SRCU
MyungJoo Hama3c98b82011-10-02 00:19:15 +02004 help
MyungJoo Ham6c81f902011-11-14 23:31:35 +01005 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.
MyungJoo Hama3c98b82011-10-02 00:19:15 +02009
MyungJoo Ham6c81f902011-11-14 23:31:35 +010010 Each device may have its own governor and policy. Devfreq can
MyungJoo Hama3c98b82011-10-02 00:19:15 +020011 reevaluate the device state periodically and/or based on the
MyungJoo Ham6c81f902011-11-14 23:31:35 +010012 notification to "nb", a notifier block, of devfreq.
MyungJoo Hama3c98b82011-10-02 00:19:15 +020013
MyungJoo Ham6c81f902011-11-14 23:31:35 +010014 Like some CPUs with CPUfreq, a device may have multiple clocks.
MyungJoo Hama3c98b82011-10-02 00:19:15 +020015 However, because the clock frequencies of a single device are
MyungJoo Ham6c81f902011-11-14 23:31:35 +010016 determined by the single device's state, an instance of devfreq
MyungJoo Hama3c98b82011-10-02 00:19:15 +020017 is attached to a single device and returns a "representative"
MyungJoo Ham6c81f902011-11-14 23:31:35 +010018 clock frequency of the device, which is also attached
19 to a device by 1-to-1. The device registering devfreq takes the
Masanari Iida6b2aac42012-04-14 00:14:11 +090020 responsibility to "interpret" the representative frequency and
MyungJoo Hama3c98b82011-10-02 00:19:15 +020021 to set its every clock accordingly with the "target" callback
MyungJoo Ham6c81f902011-11-14 23:31:35 +010022 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.
MyungJoo Hama3c98b82011-10-02 00:19:15 +020028
29if PM_DEVFREQ
30
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020031comment "DEVFREQ Governors"
32
33config DEVFREQ_GOV_SIMPLE_ONDEMAND
Nishanth Menoneff607f2012-10-29 15:01:46 -050034 tristate "Simple Ondemand"
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020035 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
Nishanth Menoneff607f2012-10-29 15:01:46 -050043 tristate "Performance"
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020044 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
Nishanth Menoneff607f2012-10-29 15:01:46 -050051 tristate "Powersave"
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020052 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
Nishanth Menoneff607f2012-10-29 15:01:46 -050059 tristate "Userspace"
MyungJoo Hamce26c5b2011-10-02 00:19:34 +020060 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
MyungJoo Hama3c98b82011-10-02 00:19:15 +020067comment "DEVFREQ Drivers"
68
MyungJoo Ham7b405032011-07-14 10:33:55 +090069config ARM_EXYNOS4_BUS_DEVFREQ
70 bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
Sachin Kamatba7abeb2014-01-22 14:18:32 +053071 depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM
MyungJoo Ham7b405032011-07-14 10:33:55 +090072 select DEVFREQ_GOV_SIMPLE_ONDEMAND
Chanwoo Choib0d50682014-03-20 11:59:11 +090073 select PM_OPP
MyungJoo Ham7b405032011-07-14 10:33:55 +090074 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.
Paul Bollecb7063f2014-05-21 22:37:34 +020079 This does not yet operate with optimal voltages.
MyungJoo Ham7b405032011-07-14 10:33:55 +090080
Abhilash Kesavan6ccce692013-02-04 17:44:48 +053081config ARM_EXYNOS5_BUS_DEVFREQ
Punit Agrawal81da57e2014-07-18 15:09:54 +010082 tristate "ARM Exynos5250 Bus DEVFREQ Driver"
Abhilash Kesavan6ccce692013-02-04 17:44:48 +053083 depends on SOC_EXYNOS5250
Abhilash Kesavan6ccce692013-02-04 17:44:48 +053084 select DEVFREQ_GOV_SIMPLE_ONDEMAND
Chanwoo Choiae29fa12014-03-20 11:59:13 +090085 select PM_OPP
Abhilash Kesavan6ccce692013-02-04 17:44:48 +053086 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
Tomeu Vizoso6234f382014-11-24 13:28:17 +010091config 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
Chanwoo Choif262f282015-01-26 13:16:27 +0900101source "drivers/devfreq/event/Kconfig"
102
MyungJoo Hama3c98b82011-10-02 00:19:15 +0200103endif # PM_DEVFREQ