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Documentation: Power Management for ESP32-P4-Function-EV-Board

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This commit documents the power management defconfig for the
ESP32-P4-Function-EV-Board.

Signed-off-by: Tiago Medicci Serrano <tiago.medicci@espressif.com>
This commit is contained in:
Tiago Medicci Serrano
2026-04-06 16:49:02 -03:00
committed by Alan C. Assis
parent 745f7542d9
commit 6ef0d35894
1 changed files with 57 additions and 0 deletions
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Documentation/platforms/risc-v/esp32p4/boards/esp32p4-function-ev-board/index.rst
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@@ -234,6 +234,63 @@ ostest
Runs OS tests from ``apps/testing/ostest``.
pm
-------
This config demonstrate the use of power management.
You can use the ``pmconfig`` command to check current power state and time spent in other power states.
Also you can define time will spend in standby and sleep modes::
$ make menuconfig
-> Board Selection
-> (15) PM_STANDBY delay (seconds)
(0) PM_STANDBY delay (nanoseconds)
(20) PM_SLEEP delay (seconds)
(0) PM_SLEEP delay (nanoseconds)
Timer wakeup is not only way to wake up the chip. Other wakeup modes include:
- EXT1 wakeup mode: Uses RTC GPIO pins to wake up the chip. Enabled with ``CONFIG_PM_EXT1_WAKEUP`` option.
- GPIO wakeup mode: Uses GPIO pins to wakeup the chip. Only wakes up the chip from ``PM_STANDBY`` mode and requires ``CONFIG_PM_GPIO_WAKEUP``.
- UART wakeup mode: Uses UART to wakeup the chip. Only wakes up the chip from ``PM_STANDBY`` mode and requires ``CONFIG_PM_GPIO_WAKEUP``.
Before switching PM status, you need to query the current PM status to call correct number of relax command to correct modes::
nsh> pmconfig
Last state 0, Next state 0
/proc/pm/state0:
DOMAIN0 WAKE SLEEP TOTAL
normal 0s 00% 0s 00% 0s 00%
idle 0s 00% 0s 00% 0s 00%
standby 0s 00% 0s 00% 0s 00%
sleep 0s 00% 0s 00% 0s 00%
/proc/pm/wakelock0:
DOMAIN0 STATE COUNT TIME
system normal 2 1s
system idle 1 1s
system standby 1 1s
system sleep 1 1s
In this case, needed commands to switch the system into PM idle mode::
nsh> pmconfig relax normal
nsh> pmconfig relax normal
In this case, needed commands to switch the system into PM standby mode::
nsh> pmconfig relax idle
nsh> pmconfig relax normal
nsh> pmconfig relax normal
System switch to the PM sleep mode, you need to enter::
nsh> pmconfig relax standby
nsh> pmconfig relax idle
nsh> pmconfig relax normal
nsh> pmconfig relax normal
pwm
---