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menuconfig PM_DEVFREQ
bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
help
A device may have a list of frequencies and voltages available.
devfreq, a generic DVFS framework can be registered for a device
in order to let the governor provided to devfreq choose an
operating frequency based on the device driver's policy.
Each device may have its own governor and policy. Devfreq can
reevaluate the device state periodically and/or based on the
notification to "nb", a notifier block, of devfreq.
Like some CPUs with CPUfreq, a device may have multiple clocks.
However, because the clock frequencies of a single device are
determined by the single device's state, an instance of devfreq
is attached to a single device and returns a "representative"
clock frequency of the device, which is also attached
to a device by 1-to-1. The device registering devfreq takes the
responsibility to "interpret" the representative frequency and
to set its every clock accordingly with the "target" callback
given to devfreq.
When OPP is used with the devfreq device, it is recommended to
register devfreq's nb to the OPP's notifier head. If OPP is
used with the devfreq device, you may use OPP helper
functions defined in devfreq.h.
if PM_DEVFREQ
comment "DEVFREQ Governors"
config DEVFREQ_GOV_SIMPLE_ONDEMAND
tristate "Simple Ondemand"
help
Chooses frequency based on the recent load on the device. Works
similar as ONDEMAND governor of CPUFREQ does. A device with
Simple-Ondemand should be able to provide busy/total counter
values that imply the usage rate. A device may provide tuned
values to the governor with data field at devfreq_add_device().
config DEVFREQ_GOV_PERFORMANCE
tristate "Performance"
help
Sets the frequency at the maximum available frequency.
This governor always returns UINT_MAX as frequency so that
the DEVFREQ framework returns the highest frequency available
at any time.
config DEVFREQ_GOV_POWERSAVE
tristate "Powersave"
help
Sets the frequency at the minimum available frequency.
This governor always returns 0 as frequency so that
the DEVFREQ framework returns the lowest frequency available
at any time.
config DEVFREQ_GOV_USERSPACE
tristate "Userspace"
help
Sets the frequency at the user specified one.
This governor returns the user configured frequency if there
has been an input to /sys/devices/.../power/devfreq_set_freq.
Otherwise, the governor does not change the frequnecy
given at the initialization.
config DEVFREQ_GOV_ONDEMAND
tristate "Ondemand"
help
Chooses frequency based on the recent load on the device. Works
similar as ONDEMAND governor of CPUFREQ does. A device with
Simple-Ondemand should be able to provide busy/total counter
values that imply the usage rate.
Requests from user space and devices drivers can also tune frequency
comment "DEVFREQ Drivers"
config ARM_EXYNOS4_BUS_DEVFREQ
bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
depends on CPU_EXYNOS4210 || CPU_EXYNOS4212 || CPU_EXYNOS4412
select ARCH_HAS_OPP
select DEVFREQ_GOV_SIMPLE_ONDEMAND
help
This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
It reads PPMU counters of memory controllers and adjusts
the operating frequencies and voltages with OPP support.
To operate with optimal voltages, ASV support is required
(CONFIG_EXYNOS_ASV).
config SPRD_SCX35_DMC_FREQ
bool "Spreadtrum scx35 Memory Bus DMCFREQ Driver"
depends on ARCH_SCX35
select ARCH_HAS_OPP
select DEVFREQ_GOV_ONDEMAND
help
This adds the DMCFREQ driver for Spreadtrum scx35 memory bus (vdd_core)
It reads PPMU counters of memory controllers and adjusts
the operating frequencies with OPP support.
config SCX35_DMC_FREQ_AP
bool "Spreadtrum scx35 DDR DFS in AP side"
depends on ARCH_SCX35
help
This adds the DMCFREQ drive, DDR DFS run in AP side
config SCX35_DMC_FREQ_CP0
bool "Spreadtrum scx35 DDR DFS in cp0 side"
depends on ARCH_SCX35
help
This adds the DMCFREQ drive, DDR DFS run in cp0.
please make sure the cp0 is free.
config SCX35_DMC_FREQ_CP1
bool "Spreadtrum scx35 DDR DFS in cp1 side"
depends on ARCH_SCX35
help
This adds the DMCFREQ drive, DDR DFS run in cp1.
please make sure the cp1 is free.
config SCX35_DMC_FREQ_CP2
bool "Spreadtrum scx35 DDR DFS in cp2 side"
depends on ARCH_SCX35
help
This adds the DMCFREQ drive, DDR DFS run in cp2.
please make sure the cp2 is free.
config SCX35_DMC_FREQ_DDR3
bool "Spreadtrum scx35 DDR DFS for ddr3 side"
depends on ARCH_SCX35
help
This adds the DMCFREQ drive, DDR DFS run for ddr3.
please make sure the cp1 is free.
config SPRD_SCX35_DMC_FREQ_DEBUG
bool "Spreadtrum scx35 Memory Bus DMCFREQ Driver debug"
depends on SPRD_SCX35_DMC_FREQ
help
DMCFREQ driver for Spreadtrum scx35 memory bus debug.
endif # PM_DEVFREQ
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