From 2bf065d3046ebc5618a39c16dc8021a0e2b8ff1b Mon Sep 17 00:00:00 2001
From: Akashdeep Kaur <a-kaur@ti.com>
Date: Thu, 12 Feb 2026 17:20:20 +0530
Subject: [PATCH 1/3] feat(linux): AM62Lx: Add documentation for RTC Only mode

Add documentation on how to enter RTC Only low power mode on AM62L
EVM. This includes all the prerequisites and alternatives to enter this
mode.

Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
---
 source/images/am62l_lpm_j14.png               | Bin 0 -> 12581 bytes
 .../pm_am62lx_low_power_modes.rst             |  62 ++++++++++++++++++
 .../Power_Management/pm_overview.rst          |   1 +
 .../Power_Management/pm_wakeup_sources.rst    |  30 ++++-----
 4 files changed, 78 insertions(+), 15 deletions(-)
 create mode 100644 source/images/am62l_lpm_j14.png

diff --git a/source/images/am62l_lpm_j14.png b/source/images/am62l_lpm_j14.png
new file mode 100644
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diff --git a/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst b/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
index 76208b0f1..4d20d9b36 100644
--- a/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
+++ b/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
@@ -15,9 +15,71 @@ values are detailed in the device-specific data sheet. As part of this SDK offer
 Texas Instruments has added support for the following low power modes (ordered from lowest power consumption
 to highest power consumption):
 
+#. RTC Only
 #. RTC Only Plus DDR
 #. Deep Sleep
 
+RTC Only
+********
+
+RTC Only mode is the deepest low power mode that allows the system to enter a complete poweroff state
+with ultra-low power consumption while maintaining system time and wakeup capability.
+Unlike other low power modes, RTC Only powers off all domains except the RTC, which remains active
+to keep track of system time and provide wakeup via RTC alarm or RTC I/O event.
+
+.. note::
+
+   The system loses nearly all its state as DDR is also turned-off.
+   RTC Only is comparable with a Linux poweroff state with system timer ON.
+
+.. important::
+
+   Jumper J14 position on the EVM determines which low power mode is entered. For RTC Only mode,
+   connect jumper J14 to the position marked as "RTC ONLY MODE".
+
+   .. image:: /images/am62l_lpm_j14.png
+
+The reference implementation in this SDK implements RTC Only as a poweroff state.
+When the system powers off, the RTC driver programs the RTC hardware for poweroff mode.
+The final sequence to power off the system is executed by TF-A firmware, which pulls the PMIC_EN
+signal low to turn off all the supply rails powered by the PMIC.
+
+On AM62L platforms, if the ``system-power-controller`` device tree property is not set on the PMIC node,
+the PMIC will not register a poweroff handler. In this configuration, TF-A firmware handles the
+poweroff sequence and the system enters RTC Only mode. This allows the system to maintain accurate
+system time and provide wakeup capability via RTC alarm or external button press while consuming
+minimal power.
+
+RTC Only mode supports two wakeup sources: RTC timer alarm and RTC I/O pins.
+
+Use the following command to enter RTC Only mode with a timer alarm for wakeup:
+
+.. code-block:: console
+
+   root@<machine>:~# rtcwake -s <time> -m off
+
+Use the following command to enter RTC Only mode with RTC I/O (button press) for wakeup:
+
+.. code-block:: console
+
+   root@<machine>:~# poweroff
+
+At this point, the Linux kernel will go through its poweroff process and
+the console output will stop at the following lines:
+
+.. code-block:: dmesg
+
+   [   51.698039] systemd-shutdown[1]: Powering off.
+   [   51.769478] reboot: Power down
+
+The system has entered RTC Only mode and can be woken up by activity on an RTC I/O pin
+programmed for wakeup. If an alarm was set, the system will automatically wake up
+when the alarm triggers.
+
+During resume from RTC Only mode, the system goes through a normal Linux boot process. The RTC driver
+detects that the RTC is already programmed and skips the full initialization, performing only minimal
+cleanup to preserve the system time.
+
 RTC Only Plus DDR
 *****************
 
diff --git a/source/linux/Foundational_Components/Power_Management/pm_overview.rst b/source/linux/Foundational_Components/Power_Management/pm_overview.rst
index d89077a07..bcb6b4fd4 100644
--- a/source/linux/Foundational_Components/Power_Management/pm_overview.rst
+++ b/source/linux/Foundational_Components/Power_Management/pm_overview.rst
@@ -63,5 +63,6 @@ supported by the Linux kernel.
 
    The static power management features on |__PART_FAMILY_DEVICE_NAMES__| are:
 
+   #. RTC Only
    #. RTC Only Plus DDR
    #. Deep Sleep
diff --git a/source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst b/source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
index c97c9ce47..89eb4ce7d 100644
--- a/source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
+++ b/source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
@@ -53,21 +53,21 @@ valid for given low power modes:
 
 .. ifconfig:: CONFIG_part_variant in ('AM62LX')
 
-   +------------------------------------------------+------------+----------------+
-   |  Wakeup Source                                 | Deep Sleep | RTC Only + DDR |
-   +================================================+============+================+
-   | Real-Time Clock (RTC)                          | Yes        | Yes            |
-   +------------------------------------------------+------------+----------------+
-   | WKUP GPIO                                      | Yes        | No             |
-   +------------------------------------------------+------------+----------------+
-   | Main I/O Daisy Chain (Main GPIO and Main UART) | Yes        | No             |
-   +------------------------------------------------+------------+----------------+
-   | WKUP UART                                      | Yes        | No             |
-   +------------------------------------------------+------------+----------------+
-   | USB Wakeup                                     | Yes        | No             |
-   +------------------------------------------------+------------+----------------+
-   | RTC Ext Pin                                    | Yes        | Yes            |
-   +------------------------------------------------+------------+----------------+
+   +------------------------------------------------+------------+----------------+----------+
+   |  Wakeup Source                                 | Deep Sleep | RTC Only + DDR | RTC Only |
+   +================================================+============+================+==========+
+   | Real-Time Clock (RTC)                          | Yes        | Yes            | Yes      |
+   +------------------------------------------------+------------+----------------+----------+
+   | WKUP GPIO                                      | Yes        | No             | No       |
+   +------------------------------------------------+------------+----------------+----------+
+   | Main I/O Daisy Chain (Main GPIO and Main UART) | Yes        | No             | No       |
+   +------------------------------------------------+------------+----------------+----------+
+   | WKUP UART                                      | Yes        | No             | No       |
+   +------------------------------------------------+------------+----------------+----------+
+   | USB Wakeup                                     | Yes        | No             | No       |
+   +------------------------------------------------+------------+----------------+----------+
+   | RTC Ext Pin                                    | Yes        | Yes            | Yes      |
+   +------------------------------------------------+------------+----------------+----------+
 
 *********************
 Real-Time Clock (RTC)

From 4982788c4dd2d5f77a02490bf2a86a7111c776f3 Mon Sep 17 00:00:00 2001
From: Akashdeep Kaur <a-kaur@ti.com>
Date: Thu, 12 Feb 2026 17:22:39 +0530
Subject: [PATCH 2/3] feat(linux): AM62Lx: Add performance numbers for RTC Only
 mode

Add power measured in RTC Only low power mode and resume latency taken
to resume from RTC Only low power mode on AM62L EVM.

Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
---
 .../AM62LX/linux/Linux_Performance_Guide.rst  | 25 ++++++++++++++-----
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/source/devices/AM62LX/linux/Linux_Performance_Guide.rst b/source/devices/AM62LX/linux/Linux_Performance_Guide.rst
index 5d3119670..0457fac3a 100644
--- a/source/devices/AM62LX/linux/Linux_Performance_Guide.rst
+++ b/source/devices/AM62LX/linux/Linux_Performance_Guide.rst
@@ -38,8 +38,8 @@ System Benchmarks
 
 LMBench
 ^^^^^^^
-LMBench is a collection of microbenchmarks of which the memory bandwidth 
-and latency related ones are typically used to estimate processor 
+LMBench is a collection of microbenchmarks of which the memory bandwidth
+and latency related ones are typically used to estimate processor
 memory system performance. More information about lmbench at
 https://lmbench.sourceforge.net/whatis_lmbench.html and
 https://lmbench.sourceforge.net/man/lmbench.8.html
@@ -186,7 +186,7 @@ Dhrystone is a core only benchmark that runs from warm L1 caches in all
 modern processors. It scales linearly with clock speed.
 
 Please take note, different run may produce different slightly results.
-This is advised to run this test multiple times in order to get maximum 
+This is advised to run this test multiple times in order to get maximum
 performance numbers.
 
 Execute the benchmark with the following:
@@ -485,7 +485,7 @@ CPSW/CPSW2g/CPSW3g Ethernet Driver
 - CPSW2g: AM65x, J7200, J721e, J721S2, J784S4, J742S2
 - CPSW3g: AM64x, AM62x, AM62ax, AM62px
 
-.. rubric::  TCP Bidirectional Throughput 
+.. rubric::  TCP Bidirectional Throughput
    :name: CPSW2g-tcp-bidirectional-throughput
 
 .. csv-table:: CPSW2g TCP Bidirectional Throughput
@@ -689,7 +689,7 @@ The performance numbers were captured using the following:
 
 USB Driver
 ----------
- 
+
 USB Device Controller
 ^^^^^^^^^^^^^^^^^^^^^
 
@@ -710,7 +710,7 @@ Power Performance
 ^^^^^^^^^^^^^^^^^
 
 These are power measurements taken while the device is in various low power modes like
-Deep Sleep and RTC Only + DDR.
+Deep Sleep, RTC Only + DDR, and RTC Only.
 
 .. csv-table:: Deep Sleep Power Performance
      :header: "Rail name","Rail voltage(V)","Power (mW)"
@@ -736,12 +736,25 @@ Deep Sleep and RTC Only + DDR.
      "vdd_rtc_1v8", "1.80", "0.02"
      "Total"," ","3.62"
 
+.. csv-table:: RTC Only Power Performance
+     :header: "Rail name","Rail voltage(V)","Power (mW)"
+
+     "vdd_core", "0.00", "0.00"
+     "soc_dvdd_1v8", "0.00", "0.00"
+     "soc_dvdd_3v3", "0.00", "0.00"
+     "vdda_1v8", "0.00", "0.00"
+     "vdd_lpddr4_pmic2", "0.00", "0.00"
+     "vdd_rtc", "0.75", "0.02"
+     "vdd_rtc_1v8", "1.80", "0.01"
+     "Total"," ","0.04"
+
 Resume Latency Performance
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 .. csv-table:: LPM Resume Latency Performance
    :header: "Low Power Mode","Total Resume Latency (ms)"
 
+   "RTC Only", "Full normal boot time (~seconds)"
    "RTC Only + DDR", "456.44"
    "Deep Sleep", "109.96"
 

From 85cb5f281991bf9d18c4a49baf0e549830c8f435 Mon Sep 17 00:00:00 2001
From: Akashdeep Kaur <a-kaur@ti.com>
Date: Thu, 12 Feb 2026 17:25:50 +0530
Subject: [PATCH 3/3] fix(linux): AM62Lx: Add note for jumper position to enter
 RTC DDR mode

Add a note to ensure correct jumper position to enter RTC Only plus DDR
low power mode.

Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
---
 .../Power_Management/pm_am62lx_low_power_modes.rst           | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst b/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
index 4d20d9b36..9b9967db8 100644
--- a/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
+++ b/source/linux/Foundational_Components/Power_Management/pm_am62lx_low_power_modes.rst
@@ -91,6 +91,11 @@ RTC Only Plus DDR
 RTC Only + DDR mode is the deepest low power mode that allows the system to enter a state of lowest power consumption
 while still retaining the DDR RAM context.
 
+.. important::
+
+   Jumper J14 position on the EVM determines which low power mode is entered. For RTC Only + DDR mode,
+   connect jumper J14 to the position marked as "RTC + DDR MODE" (different from RTC Only Mode).
+
 In order to enter RTC Only + DDR mode, first disable USB0 and USB1 as wakeup
 sources.