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LPM doc fixes for AM62D #743

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867ef51
feat(pm_low_power_modes): add required sysfs command to enter IO + DDR
kwillis01 Jul 13, 2026
e164cea
fix(pm_low_power_modes): fix AM62D PMIC command to enter IO + DDR
kwillis01 Jul 13, 2026
d6ca5cc
fix(pm_low_power_modes): remove PMIC command for IO + DDR on AM62P
kwillis01 Jul 14, 2026
34c7965
fix(pm_wakeup_sources): note that AM62D EVM has no GPIOs exposed for …
kwillis01 Jul 13, 2026
a1766b9
fix(pm_wakeup_sources): fix AM62D CAN wakeup
kwillis01 Jul 14, 2026
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8 changes: 6 additions & 2 deletions source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ to highest power consumption):
More details about the low power mode architecture can be found in
:ref:`LPM constraints framework<pm_constraints_fwk>` section.

.. _pm_partial_io:

***********
Partial I/O
***********
Expand Down Expand Up @@ -157,6 +159,7 @@ I/O Only Plus DDR
.. code-block:: console

root@<machine>:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/drivers/alarmtimer/*/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.dwc3-usb/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.dwc3-usb/power/wakeup
Expand All @@ -166,21 +169,22 @@ I/O Only Plus DDR
.. code-block:: console

root@<machine>:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/drivers/alarmtimer/*/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.usb/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.usb/power/wakeup

.. rubric:: Then, configure PMIC register bit to turn off only selected rails for this mode.

.. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62DX')
.. ifconfig:: CONFIG_part_variant in ('AM62AX')

.. code-block:: console

root@<machine>:~# i2cset -f -y -m 0xFF -r -a 0 0x48 0x86 0x1

The register write has been done to enable PMIC to enter `PMIC S2R <https://www.ti.com/lit/ug/slvucm3/slvucm3.pdf>`_ .

.. ifconfig:: CONFIG_part_variant in ('AM62PX')
.. ifconfig:: CONFIG_part_variant in ('AM62D')

.. code-block:: console

Expand Down
43 changes: 36 additions & 7 deletions source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
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Expand Up @@ -403,9 +403,20 @@
`k3-am62x-sk-lpm-wkup-sources.dtso <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-lpm-wkup-sources.dtso?h=12.00.00.07>`__
overlay is loaded. Refer to :ref:`How to enable DT overlays<howto_dt_overlays>` for more details.

Once the system has entered Deep Sleep or MCU Only mode as shown in the
:ref:`LPM section<lpm_modes>`, wakeup from MCU_SPI0_D1 can be triggered
by grounding Pin 4 on J8 MCU Header.
.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX')

Once the system has entered Deep Sleep or MCU Only mode as shown in the

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[RedHat.SentenceLength] Try to keep sentences to an average of 32 words or fewer.

Raw Output:
{"message": "[RedHat.SentenceLength] Try to keep sentences to an average of 32 words or fewer.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst", "range": {"start": {"line": 408, "column": 7}}}, "severity": "INFO"}
:ref:`LPM section<lpm_modes>`, wakeup from MCU_SPI0_D1 can be triggered

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[RedHat.PassiveVoice] 'be triggered' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.

Raw Output:
{"message": "[RedHat.PassiveVoice] 'be triggered' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst", "range": {"start": {"line": 409, "column": 66}}}, "severity": "INFO"}
by grounding Pin 4 on J8 MCU Header.

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

.. note::

AM62D EVM does not have any MCU GPIOs exposed. WKUP UART can be
configured as a MCU GPIO wakeup source by disabling the
target-module@2b300050 in :file:`k3-am62a-wakeup.dtsi`, and then
using the process as described in this section.

*********
WKUP GPIO
Expand Down Expand Up @@ -776,9 +787,19 @@
root@<machine>:~# grep wakeup /proc/interrupts
531: 0 0 0 0 pinctrl 416 Edge WKGPIO:wakeup

Once the system has entered Deep Sleep or MCU Only mode as shown in the
:ref:`LPM section<lpm_modes>`, wakeup from MAIN GPIO1_10 can be triggered
by grounding Pin 33 on J3 User Expansion Connector.
.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX')

Once the system has entered Deep Sleep or MCU Only mode as shown in the
:ref:`LPM section<lpm_modes>`, wakeup from MAIN GPIO1_10 can be triggered

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[RedHat.Definitions] Define acronyms and abbreviations (such as 'MAIN') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'MAIN') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst", "range": {"start": {"line": 793, "column": 50}}}, "severity": "INFO"}
by grounding Pin 33 on J3 User Expansion Connector.

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

.. note::

AM62D EVM does not have any Main GPIOs exposed. Main UART4 can be
configured as a Main GPIO wakeup source by using the process as
described in this section.

.. ifconfig:: CONFIG_part_variant in ('AM62LX')

Expand Down Expand Up @@ -1012,6 +1033,14 @@

.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX', 'AM62DX')

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

.. important::

The CAN pins are NOT exposed on the AM62D EVM, so they are not
available for use as a physical wakeup source. However, to enter
:ref:`Partial I/O LPM<pm_partial_io>` CAN I/O needs to be enabled.

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[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst", "range": {"start": {"line": 1042, "column": 28}}}, "severity": "INFO"}

CAN pins can be used to wake the system from any supported low power mode.
To enable this, in the device tree configure a "wakeup" pinctrl state that sets
the WKUP_EN flag (29th bit) on the desired padconfig register. This allows the
Expand Down Expand Up @@ -1047,7 +1076,7 @@
is required for testing CAN wakeup. See
:ref:`How to enable DT overlays<howto_dt_overlays>` for details.

.. ifconfig:: CONFIG_part_variant in ('AM62AX','AM62PX')
.. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62PX', 'AM62DX')

Either device tree overlay
`k3-am62x-sk-lpm-wkup-sources.dtso <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62x-sk-lpm-wkup-sources.dtso?h=12.00.00.07>`__
Expand Down