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Add support for AM62D LPM to docs #673

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88e5798
feat(linux): Power_Management: add AM62D support
kwillis01 Apr 14, 2026
8dae5d2
feat(linux): AM62DX: update documentation for power management
kwillis01 Apr 14, 2026
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10 changes: 9 additions & 1 deletion configs/AM62DX/AM62DX_linux_toc.txt
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Expand Up @@ -64,7 +64,15 @@ linux/Foundational_Components/Kernel/Kernel_Drivers/UBIFS
linux/Foundational_Components/Kernel/Kernel_Drivers/VTM
linux/Foundational_Components/Kernel/Kernel_Drivers/Watchdog

#linux/Foundational_Components_Power_Management
linux/Foundational_Components_Power_Management
linux/Foundational_Components/Power_Management/pm_overview
linux/Foundational_Components/Power_Management/pm_dfs
linux/Foundational_Components/Power_Management/pm_cpuidle
linux/Foundational_Components/Power_Management/pm_runtime_pm
linux/Foundational_Components/Power_Management/pm_low_power_modes
linux/Foundational_Components/Power_Management/pm_wakeup_sources
linux/Foundational_Components/Power_Management/pm_sw_arch
linux/Foundational_Components/Power_Management/pm_debug

linux/Foundational_Components_Kernel_Users_Guide
linux/Foundational_Components_Kernel_LTP-DDT_Validation
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28 changes: 14 additions & 14 deletions source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst
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Expand Up @@ -43,23 +43,23 @@
,,PRG,No
,,PGD,No
,,VTM,Yes
Power Management,Deep Sleep Low Power Mode ,,No
,Deep Sleep LPM Wakeup Events,RTC Timer,No
Power Management,Deep Sleep Low Power Mode ,,Yes
,Deep Sleep LPM Wakeup Events,RTC Timer,Yes

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'RTC') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'RTC') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 47, "column": 34}}}, "severity": "INFO"}

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

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 47, "column": 16}}}, "severity": "INFO"}
,,GT Timers,No
,,WKUP UART,No
,,WKUP UART,Yes

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'UART') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'UART') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 49, "column": 11}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'WKUP') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'WKUP') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 49, "column": 6}}}, "severity": "INFO"}
,,I2C,No
,,MCU GPIO,No
,,I/O Daisy Chain,No
,,USB Connect/Disconnect,No
,,USB Remote Wakeup,No
,MCU-Only Low Power Mode,,No
,Standby Low Power Mode,,No
,Partial I/O Low Power Mode,,No
,IO + DDR low power mode,,No
,Boot-time OPP configurations,,No
,Runtime Power Management,,No
,,MCU GPIO,Yes

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'GPIO') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'GPIO') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 51, "column": 10}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 51, "column": 6}}}, "severity": "INFO"}
,,I/O Daisy Chain,Yes
,,USB Connect/Disconnect,Yes
,,USB Remote Wakeup,Yes
,MCU-Only Low Power Mode,,Yes

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 55, "column": 5}}}, "severity": "INFO"}
,Standby Low Power Mode,,Yes
,Partial I/O Low Power Mode,,Yes
,IO + DDR low power mode,,Yes

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

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 58, "column": 10}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[RedHat.TermsErrors] Use 'I/O' rather than 'IO'.

Raw Output:
{"message": "[RedHat.TermsErrors] Use 'I/O' rather than 'IO'.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 58, "column": 5}}}, "severity": "ERROR"}
,Boot-time OPP configurations,,Yes

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

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'OPP') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 59, "column": 15}}}, "severity": "INFO"}
,Runtime Power Management,,Yes
,DFS/CPUFreq,,Yes
,CPUIdle (A53 WFI),,No
,CPUIdle (A53 WFI),,Yes

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'WFI') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'WFI') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62DX/linux/Release_Specific_Build_Sheet.rst", "range": {"start": {"line": 62, "column": 18}}}, "severity": "INFO"}
,CPUIdle (DDR in Self-Refresh),,No
Interprocessor Communication,Mailbox,,Yes
,Spinlock,,Yes
Expand Down
2 changes: 1 addition & 1 deletion source/linux/Foundational_Components/Power_Management/pm_cpuidle.rst
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Expand Up @@ -16,7 +16,7 @@ C-state. Governor decides whether to continue in current state/
transition to a different state. Current 'driver' is called to
transition to the selected state.

.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX', 'J722S')
.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX', 'J722S', 'AM62DX')

.. rubric:: Standby Mode

Expand Down
6 changes: 3 additions & 3 deletions source/linux/Foundational_Components/Power_Management/pm_dfs.rst
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Expand Up @@ -197,7 +197,7 @@ To view supported OPP's (frequency in kHz),
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
750000000 1000000000 1500000000 2000000000

.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX', 'J722S')
.. ifconfig:: CONFIG_part_variant in ('AM62X', 'AM62AX', 'AM62PX', 'J722S', 'AM62DX')

.. code-block:: console

Expand Down Expand Up @@ -248,7 +248,7 @@ table.
};
};

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

The OPP table defined in the following files
allows defining of a different set of OPPs for each different SoC:
Expand All @@ -257,7 +257,7 @@ table.

:file:`arch/arm64/boot/dts/ti/k3-am625.dtsi`

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

:file:`arch/arm64/boot/dts/ti/k3-am62a7.dtsi`

Expand Down
25 changes: 21 additions & 4 deletions source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst
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Expand Up @@ -59,6 +59,19 @@ overlay is loaded. Please refer to :ref:`How to enable DT overlays<howto_dt_over

After Linux boots, the MCAN wakeup for Partial I/O is enabled.

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

.. important::

Currently, wakeup from CAN is not available on AM62D EVM, but CAN
wakeup still needs to be **enabled** to enter Partial I/O. To wakeup
from Partial I/O, the WKUP UART should be used. To enable wakeup
from WKUP UART, enter the following command:

.. code-block:: console

root@<machine>:~# devmem2 0x4084024 w 0x20050000 # MCU_PADCONFIG9 for wkup_uart0

Enter Partial I/O mode with the following command:

.. code-block:: console
Expand Down Expand Up @@ -88,7 +101,7 @@ I/O Only Plus DDR

This mode is not applicable for AM62X.

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

This mode is similar to Partial I/O mode, with the major distinction being
that the DDR memory is kept in self refresh to save context. All the processor
Expand All @@ -113,6 +126,10 @@ I/O Only Plus DDR

.. important:: Jumper J12 should be connected on SK to enable system to enter I/O Only plus DDR mode.

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

.. important:: Jumper J16 should be connected on SK to enable system to enter I/O Only plus DDR mode.

The wakeup sources that can be used to wake the system from I/O Only Plus
DDR are mcu_uart0, mcu_mcan0, mcu_mcan1 and wkup_uart0. To use the mcu_mcan0
and mcu_mcan1 wakeup sources, apply the
Expand Down Expand Up @@ -143,7 +160,7 @@ I/O Only Plus DDR
Main UART, USB0, and USB1 as these wakeup sources are not
supported for this mode.

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

.. code-block:: console

Expand All @@ -163,7 +180,7 @@ I/O Only Plus DDR

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

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

.. code-block:: console

Expand Down Expand Up @@ -253,7 +270,7 @@ In order to enter Deep Sleep, use the following command:
[ 444.826567] psci: CPU2 killed (polled 0 ms)
[ 444.830170] psci: CPU3 killed (polled 0 ms)

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

.. code-block:: console

Expand Down
4 changes: 2 additions & 2 deletions source/linux/Foundational_Components/Power_Management/pm_overview.rst
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Expand Up @@ -31,7 +31,7 @@ The dynamic power management features enabled on |__PART_FAMILY_DEVICE_NAMES__|
#. DVFS
#. CPUIdle

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

#. Dynamic Frequency Scaling
#. CPUIdle
Expand All @@ -56,7 +56,7 @@ duration. This is accomplished by leveraging the low power modes supported
by the SoC and the `System Sleep States <https://docs.kernel.org/admin-guide/pm/sleep-states.html>`__
supported by the Linux kernel.

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

The static power management features on |__PART_FAMILY_DEVICE_NAMES__| are:

Expand Down
4 changes: 4 additions & 0 deletions source/linux/Foundational_Components/Power_Management/pm_runtime_pm.rst
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Expand Up @@ -30,6 +30,10 @@ The following drivers have been validated for Runtime PM in this release:

DSS, GPU, McASP, OSPI, MCAN, Video Codec.

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

DSS, McASP, OSPI, MCAN.

.. rubric:: Driver Usage

Linux provides the following sysfs interface (/sys/devices/.../power/)
Expand Down
2 changes: 1 addition & 1 deletion source/linux/Foundational_Components/Power_Management/pm_sw_arch.rst
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Expand Up @@ -230,7 +230,7 @@ If constraint is put on MAIN devgroup devices, then no low power mode is possibl
`Devgroup section <https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am62x/soc_devgrps.html#am62x-device-group-descriptions>`__
of TISCI documentation.

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

For detailed description for devgroup of these devices, refer to
`Devgroup section <https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am62ax/soc_devgrps.html#am62ax-device-group-descriptions>`__
Expand Down
61 changes: 48 additions & 13 deletions source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
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Expand Up @@ -30,7 +30,7 @@ valid for given low power modes:
| CAN UART I/O Daisy Chain | Yes | Yes | Yes |
+------------------------------------------------+------------+----------+-------------+

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

+------------------------------------------------+-------+------+---------+----------+
| Wakeup Source | Deep | MCU | Partial | I/O Only |
Expand Down Expand Up @@ -155,7 +155,7 @@ For example, to wakeup from Deep Sleep in 10 seconds, use the command like this:
[ 34.645777] PM: suspend exit
root@am62xx-evm:~#

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

.. code-block:: console

Expand Down Expand Up @@ -309,7 +309,7 @@ For example, to wakeup from Deep Sleep in 10 seconds, use the command like this:
[ 28.378392] random: crng reseeded on system resumption
[ 28.384269] PM: suspend exit

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

.. note::

Expand All @@ -325,7 +325,7 @@ MCU GPIO

MCU GPIO wakeup is not supported on AM62LX.

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

One of the most common ways to wakeup a system is by using some I/O activity.
I/O activity on the MCU GPIOs can wakeup the system when the MCU GPIO
Expand Down Expand Up @@ -487,7 +487,7 @@ WKUP GPIO
:ref:`LPM section<lpm_modes>`, wakeup from WKUP_UART0_RXD can be triggered
by entering a keypress on the WKUP UART (/dev/ttyUSB2).

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

Setup of WKUP GPIO is the same process of MCU GPIO. Refer to the
:ref:`MCU GPIO section<pm_mcu_gpio_wakeup>` on how to configure wakeup from
Expand All @@ -514,7 +514,7 @@ register.
For detailed information and sequence please refer to I/O Power Management and
Daisy Chaining section in the TRM.

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

.. note::

Expand Down Expand Up @@ -702,6 +702,41 @@ Main UART
bootph-all;
};

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

To configure UART as an I/O daisy chain wakeup, refer to the
main_uart0 node in `k3-am62d2-evm.dts <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts?h=12.00.00.07>`_

.. code-block:: dts

&main_pmx0 {
main_uart0_pins_default: main-uart0-default-pins {
pinctrl-single,pins = <
AM62DX_IOPAD(0x01c8, PIN_INPUT, 0) /* (E14) UART0_RXD */
AM62DX_IOPAD(0x01cc, PIN_OUTPUT, 0) /* (D15) UART0_TXD */
>;
bootph-all;
};

main_uart0_pins_wakeup: main-uart0-wakeup-pins {
pinctrl-single,pins = <
AM62DX_IOPAD(0x01c8, PIN_INPUT | PIN_WKUP_EN, 0) /* (E14) UART0_RXD */
AM62DX_IOPAD(0x01cc, PIN_OUTPUT, 0) /* (D15) UART0_TXD */
>;
};
};

&main_uart0 {
status = "okay";
pinctrl-names = "default", "wakeup";
pinctrl-0 = <&main_uart0_pins_default>;
pinctrl-1 = <&main_uart0_pins_wakeup>;
wakeup-source = <&system_deep_sleep>,
<&system_mcu_only>,
<&system_standby>;
bootph-all;
};

In the above code, a "wakeup" pinctrl state is defined for main_uart0. The
"wakeup" pinctrl state sets the WKUP_EN flag on the desired padconfig register,
which allows the pad to act as a wakeup source. During suspend, the Linux
Expand All @@ -722,7 +757,7 @@ combination of gpio-keys with a chained IRQ in the pinctrl driver. Setting the
29th bit in the desired padconfig register, allows the pad to act as a wakeup
source by triggering a wake IRQ in Deep Sleep states.

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

The reference configuration for Main GPIO wakeup can be found under
gpio_key node in
Expand Down Expand Up @@ -817,7 +852,7 @@ in a generic way using the ti-sysc interconnect target module driver.
The reference configuration can be found under target-module in
`k3-am62-wakeup.dtsi <https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am62-wakeup.dtsi?h=11.02.08#n46>`__

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

WKUP UART is generally available on the third serial port
(/dev/ttyUSB2) and by default it only shows output from DM R5.
Expand Down Expand Up @@ -946,7 +981,7 @@ MCU IPC based Wakeup

MCU IPC wakeup is not supported on AM62LX.

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

It's possible to use IPC based wakeup events from the MCU core. For details on how to implement this
from the firmware side, please refer to the relevant documentation:
Expand All @@ -955,7 +990,7 @@ MCU IPC based Wakeup

`MCU+ SDK for AM62x <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62X/11_01_00_16/exports/docs/api_guide_am62x/index.html>`__

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

`MCU+ SDK for AM62Ax <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/11_01_00_16/exports/docs/api_guide_am62ax/index.html>`__

Expand Down Expand Up @@ -990,7 +1025,7 @@ CAN UART I/O Daisy Chain

CAN UART wakeup is not supported on AM62LX.

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

It is possible to wakeup the system from CAN UART pins in all supported low
power modes. This is possible once CAN UART is configured.
Expand Down Expand Up @@ -1050,7 +1085,7 @@ CAN UART I/O Daisy Chain
RTC Ext Pin
***********

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

This is not applicable for |__PART_FAMILY_DEVICE_NAMES__|.

Expand All @@ -1068,7 +1103,7 @@ Confirming the Wakeup event type

This is not applicable for AM62LX.

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

When the SoC wakes up from any Low Power Mode, the Device Manager logs the wake
reason, the pin number that triggered the wakeup, and the last low power mode
Expand Down
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