c45961daae
This commit simplifies OS <-> Application interface controlling power management. In the previous approach application-based PM required overriding sys_suspend() and sys_resume() functions. As these functions actually implemented power state change, in such case application basically had to provide own implementation of all PM-related stuff, which was not portable and hard to maintain. This commit changes this scheme: The sys_suspend() and sys_resume() are now system functions while the application could either use built-in power management policies or provide its own. All details of power mode switching are now handled by the OS. Also, this commit cleans up the Kconfig options related to system-level power management grouping them under common CONFIG_SYS_PM_ prefix. Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
#
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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# Copyright (c) 2016 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menuconfig SYS_POWER_MANAGEMENT
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bool "System Power management"
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select TICKLESS_IDLE
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help
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This option enables the board to implement extra power management
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policies whenever the kernel becomes idle. The kernel informs the
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power management subsystem of the number of ticks until the next kernel
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timer is due to expire.
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if SYS_POWER_MANAGEMENT
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config SYS_POWER_LOW_POWER_STATES
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bool "Low Power states"
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depends on SYS_POWER_LOW_POWER_STATES_SUPPORTED
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help
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This option enables the kernel to interface with a power manager
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application. This permits the system to enter a custom CPU low power
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state when the kernel becomes idle. The low power state could be any of
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the CPU low power states supported by the processor. Generally the one
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saving most power.
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config SYS_POWER_DEEP_SLEEP_STATES
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bool "Deep Sleep states"
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depends on SYS_POWER_DEEP_SLEEP_STATES_SUPPORTED
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help
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This option enables the kernel to interface with a power manager
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application. This permits the system to enter a Deep sleep state
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supported by the SOC where the system clock is turned off while RAM is
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retained. This state would be entered when the kernel becomes idle for
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extended periods and would have a high wake latency. Resume would be
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from the reset vector same as cold boot. The interface allows
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restoration of states that were saved at the time of suspend.
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source "subsys/power/Kconfig"
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endif # SYS_POWER_MANAGEMENT
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config DEVICE_POWER_MANAGEMENT
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bool "Device power management"
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help
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This option enables the device power management interface. The
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interface consists of hook functions implemented by device drivers
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that get called by the power manager application when the system
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is going to suspend state or resuming from suspend state. This allows
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device drivers to do any necessary power management operations
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like turning off device clocks and peripherals. The device drivers
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may also save and restore states in these hook functions.
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