90 lines
3.2 KiB
Plaintext
90 lines
3.2 KiB
Plaintext
#
|
|
# Copyright (c) 2014-2015 Wind River Systems, Inc.
|
|
# Copyright (c) 2016 Intel Corporation
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
#
|
|
|
|
menuconfig SYS_POWER_MANAGEMENT
|
|
bool
|
|
prompt "Power management"
|
|
default n
|
|
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_LOW_POWER_STATE
|
|
bool
|
|
prompt "Low power state"
|
|
default n
|
|
depends on SYS_POWER_LOW_POWER_STATE_SUPPORTED
|
|
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
|
|
bool
|
|
prompt "Deep sleep state"
|
|
default n
|
|
depends on SYS_POWER_DEEP_SLEEP_SUPPORTED
|
|
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.
|
|
|
|
config DEVICE_POWER_MANAGEMENT
|
|
bool
|
|
prompt "Device power management"
|
|
default n
|
|
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.
|
|
|
|
config TICKLESS_IDLE
|
|
bool
|
|
prompt "Tickless idle"
|
|
default y if TICKLESS_IDLE_SUPPORTED
|
|
help
|
|
This option suppresses periodic system clock interrupts whenever the
|
|
kernel becomes idle. This permits the system to remain in a power
|
|
saving state for extended periods without having to wake up to
|
|
service each tick as it occurs.
|
|
|
|
config TICKLESS_IDLE_THRESH
|
|
int
|
|
prompt "Tickless idle threshold"
|
|
default 3
|
|
depends on TICKLESS_IDLE
|
|
help
|
|
This option enables clock interrupt suppression when the kernel idles
|
|
for only a short period of time. It specifies the minimum number of
|
|
ticks that must occur before the next kernel timer expires in order
|
|
for suppression to happen.
|
|
|
|
endif
|