is it possible disable buck boost regulator 3.3 (stm32mp157c pmic) during system suspend from dtsi configs ?

Forum|Forum|3 years ago
November 28, 2022
1 reply
785 views

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STM32MP15 lines

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Best answer by PatrickF

Hi @rahuj.1

During system STANDBY, the VDD (usually STPMIC1 buck3) must be kept powered in order to allow wake-up from STM32MP15x RTC/TAMP IP or WKUP pins (which will make PWR_ON pin to go high which ask STPMIC1 to restore supplies which has been shutdown). Other supplies are usually shutdown if not requested by peripherals (managed by Linux).

If you want to fully shutdown the system, this is possible by asking STPMIC1 to completely shutdown, but then, only STPMIC1 could power-on again the system (from STPMIC1 PONKEYn or WAKEUP pins).

and https://wiki.st.com/stm32mpu/wiki/How_to_define_your_low-power_strategy

Regards.

PatrickFBest answer

ST Employee

Hi @rahuj.1

During system STANDBY, the VDD (usually STPMIC1 buck3) must be kept powered in order to allow wake-up from STM32MP15x RTC/TAMP IP or WKUP pins (which will make PWR_ON pin to go high which ask STPMIC1 to restore supplies which has been shutdown). Other supplies are usually shutdown if not requested by peripherals (managed by Linux).

If you want to fully shutdown the system, this is possible by asking STPMIC1 to completely shutdown, but then, only STPMIC1 could power-on again the system (from STPMIC1 PONKEYn or WAKEUP pins).

and https://wiki.st.com/stm32mpu/wiki/How_to_define_your_low-power_strategy

Regards.

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