# Copyright (c) 2014-2015 Wind River Systems, Inc. # Copyright (c) 2016 Intel Corporation # SPDX-License-Identifier: Apache-2.0 menuconfig SYS_POWER_MANAGEMENT bool "System Power management" select TICKLESS_IDLE help This option enables the board to implement extra power management policies whenever the kernel becomes idle. The kernel informs the power management subsystem of the number of ticks until the next kernel timer is due to expire. if SYS_POWER_MANAGEMENT config SYS_POWER_SLEEP_STATES bool "Low Power states" depends on HAS_SYS_POWER_STATE_SLEEP_1 || \ HAS_SYS_POWER_STATE_SLEEP_2 || \ HAS_SYS_POWER_STATE_SLEEP_3 help This option enables the kernel to interface with a power manager application. This permits the system to enter a custom CPU low power state when the kernel becomes idle. The low power state could be any of the CPU low power states supported by the processor. Generally the one saving most power. config SYS_POWER_DEEP_SLEEP_STATES bool "Deep Sleep states" depends on HAS_SYS_POWER_STATE_DEEP_SLEEP_1 || \ HAS_SYS_POWER_STATE_DEEP_SLEEP_2 || \ HAS_SYS_POWER_STATE_DEEP_SLEEP_3 help This option enables the kernel to interface with a power manager application. This permits the system to enter a Deep sleep state supported by the SOC where the system clock is turned off while RAM is retained. This state would be entered when the kernel becomes idle for extended periods and would have a high wake latency. Resume would be from the reset vector same as cold boot. The interface allows restoration of states that were saved at the time of suspend. source "subsys/power/Kconfig" endif # SYS_POWER_MANAGEMENT config DEVICE_POWER_MANAGEMENT bool "Device power management" help This option enables the device power management interface. The interface consists of hook functions implemented by device drivers that get called by the power manager application when the system is going to suspend state or resuming from suspend state. This allows device drivers to do any necessary power management operations like turning off device clocks and peripherals. The device drivers may also save and restore states in these hook functions.