When issuing the shutdown command the BUCK3 VDD regulator used for IO is not turned off.

[SKris]

When we tried the shutdown command ( shutdown -hP now ) from the debug console, all the PMIC regulators are turned off, except for the BUCK3 VDD regulator used for IO.

Both our custom board which uses STPMIC1E and the STM32MP157F-eval board which has STPMIC1A have the same behavior.

Is there any configuration which is not letting it to be turned off?

Any help is much appreciated.

[Kevin HUBER · Accepted solution]

Hello @SKris​ ,

It looks like your board is just going into standby mode. Please can you follow the best answer from this community post: https://community.st.com/s/question/0D53W00001JAWO4SAP/steps-to-lowest-power

You have to modify the DTS to allow a real system shutdown.

Regards,

Kevin

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[SKris]

Hi Kevin,

Thanks a lot for sharing the link.

The suggested changes to the tf-a device tree worked for us, now we see the buck3 being turned off when shutdown command is executed.

Thanks,

Shalini