Verdin AM62 issues with wake up

rodolfo_silva · September 22, 2025, 4:12pm

Hello,

I need to use the CTRL_PWR_BTN_MICO in a Verdin AM62 V1.2A module the same way a smart phone button works, like mentioned in the Verdin family spec Section 5.3.

After configuring logind’s “HandlePowerKey” with “hibernate”, short presses of the CTRL_PWR_BTN_MICO now put the module into sleep. According to the spec, the CTRL_PWR_BTN_MICO should be be able to wake the module up, the problem is that only CTRL_WAKE1_MICO can do it.

Is it possible to configure CTRL_PWR_BTN_MICO also as a wake up source? I tried to put “ti,power-button” in the PMIC’s device tree node with an overlay but the module did not stop rebooting after that.

I also tried shorting CTRL_PWR_BTN_MICO and CTRL_WAKE1_MICO together but the device would only boot up again after the PMIC’s shutdown if I removed the power source and waited until the LEDs were off.

I’m using a Verdin AM62 Dual WB IT V1.2A and a Mallow carrier board V1.1C. The BSP version is 7.4.0-devel-20250905163604-build.0.

ToradexAI · September 22, 2025, 4:13pm

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Based on the Verdin AM62 V1.2 datasheet and power management specifications, I can help clarify the power button functionality and wake-up configuration.

CTRL_PWR_BTN_MICO# Power Button Behavior

According to the Verdin Family Specification, the CTRL_PWR_BTN_MICO# signal functions as follows (1)(2):

Short pressing (< 5 seconds): Powers up the system from “Module OFF” state or wakes the system from sleep state
Long pressing (> 5 seconds): Shuts down the system immediately without software interaction
When the module is running, short pressing generates a software interrupt that can trigger shutdown or open a power menu

Wake-Up Sources Configuration

The Verdin AM62 V1.2 has dedicated wake-up capabilities through specific pins (3):

CTRL_WAKE1_MICO#: This is the dedicated wake-capable pin for resuming from sleep mode (1)(2)
CTRL_PWR_BTN_MICO#: While this can wake from “Module OFF” state, its behavior during sleep states depends on the power management configuration

Device Tree Customization Approach

For configuring power button wake-up functionality, you should use Device Tree Overlays rather than modifying the base device tree (4). Device Tree Overlays provide a flexible way to customize hardware configuration without rebuilding the entire system.

Pin Configuration Details

Looking at the Verdin AM62 V1.2 datasheet, the power management signals are defined as (3):

CTRL_PWR_BTN_MICO# is an open-drain input with 100k pull-up resistor to the 1.8V RTC rail
CTRL_WAKE1_MICO# has no pull resistors on the module and can be left floating if wake feature is disabled in software

Recommendations

Use CTRL_WAKE1_MICO# as the primary wake-up source, as it’s specifically designed for this purpose
Configure the PMIC properly through device tree overlays rather than direct modifications
Check power management sequences to ensure proper sleep/wake transitions

The rebooting issue you experienced when adding “ti,power-button” suggests a configuration conflict. Instead of shorting the pins together, consider using CTRL_WAKE1_MICO# as your dedicated wake-up source while keeping CTRL_PWR_BTN_MICO# for power management functions.

For detailed pin assignments and alternate functions, refer to the Interface Description section of the Verdin AM62 V1.2 datasheet (3).

Best regards, Toradex AI Assistant.

rodolfo_silva · September 23, 2025, 5:19pm

As per product requirement, I cannot have a dedicated button to wake the device up. So, it’s not possible to use CTRL_WAKE1_MICO as the wake up source.

The modification to the PMIC’s node was done via device tree overlay.

Is it possible to configure the CTRL_PWR_BTN_MICO pin so that it can trigger a software sleep and also wake the module up as shown in the flowchart in the Verdin family specification Section 5.3 (Figure 11)?

lucas_az.tx · October 3, 2025, 3:40pm

Hi @rodolfo_silva!

Sorry for the delayed response.

According to the flowchart you referenced, the sleep mode is triggered by software. Then, the CTRL_PWR_BTN_MICO is used to wake the system. Therefore, I’m not sure if it is possible to activate the sleep mode with the CTRL_PWR_BTN_MICO.

I’ll try to test in the next days and also talk to the R&D team to check if this behavior is expected or not.

Feel free to ask if you have any doubts.

Best regards.

rodolfo_silva · October 3, 2025, 4:23pm

I configured the software trigger via logind with a drop-in file. As is, it is possible to both suspend and shut down with the CTRL_PWR_BTN_MICO.

At the moment I can’t use the CTRL_PWR_BTN_MICO pin as wake up from the suspended state, whereas I can do it with the CTRL_WAKE1_MICO pin.

If needed, here’s the drop-in I’m using:

[Login]
HandlePowerKey=suspend
HandlePowerKeyLongPress=poweroff

daniel_m.tx · October 29, 2025, 12:53pm

Hello @rodolfo_silva !

I hope you’re doing well.

I noticed it has been a while since the last update on this topic, and I’d like to kindly check if you were able to make any progress regarding this issue.

Best regards,
Daniel Morais