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gunesalp
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September 15, 2023
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STM32MP135F-DK How to set LDO2

  • September 15, 2023
  • 1 reply
  • 2491 views

Hi, I have an STM32MP135F-DK board, and I want to set LDO2 and get an output voltage of 3.3V. I have read a document ( Integration of STM32MP13x MPU product lines and STPMIC1D / STPMIC1A on a wall adapter supply) which states that LDO2 must be set after boot sequence by software. Unfortunately I could not find a way to do that.  I am stuck and any help is appreciated.

 

 

    This topic has been closed for replies.
    Best answer by Olivier GALLIEN

    Hi @gunesalp 

     

    Have a look into TF-A code and device tree and follow how is manage a supply like BUCK2. 

    tf-a-stm32mp-v2.6-stm32mp-r2/fdts/stm32mp135f-dk.dts

    Create a specific node for LDO2 in stpmic node -> by set it always-on it might  be turn-on by TF-A

    For further investigation looks how it's managed starting from : 

    drivers/st/pmic/stm32mp_pmic.c

     

    Hope it help 

    Olivier 
     

    1 reply

    O
    Olivier GALLIENAnswer
    Technical Moderator
    September 15, 2023

    Hi @gunesalp 

     

    Have a look into TF-A code and device tree and follow how is manage a supply like BUCK2. 

    tf-a-stm32mp-v2.6-stm32mp-r2/fdts/stm32mp135f-dk.dts

    Create a specific node for LDO2 in stpmic node -> by set it always-on it might  be turn-on by TF-A

    For further investigation looks how it's managed starting from : 

    drivers/st/pmic/stm32mp_pmic.c

     

    Hope it help 

    Olivier 
     

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