fe98461fea
Dependencies on CPU_EXYNOS4212 and CPU_EXYNOS4412 for the "ARM
Exynos4210/4212/4412 Memory Bus DEVFREQ Driver" were added in commit
7b40503811 ("PM/Devfreq: Add Exynos4-bus
device DVFS driver for Exynos4210/4212/4412."). The tree (at that time,
v3.3, and currently) makes clear that this should have been dependencies
on SOC_EXYNOS4212 and SOC_EXYNOS4412.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
3.5 KiB
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.
comment "DEVFREQ Drivers"
config ARM_EXYNOS4_BUS_DEVFREQ bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver" depends on CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_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 ARM_EXYNOS5_BUS_DEVFREQ bool "ARM Exynos5250 Bus DEVFREQ Driver" depends on SOC_EXYNOS5250 select ARCH_HAS_OPP select DEVFREQ_GOV_SIMPLE_ONDEMAND help This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int). It reads PPMU counters of memory controllers and adjusts the operating frequencies and voltages with OPP support.
endif # PM_DEVFREQ