STM32MP135F-DK How to set LDO2

[gunesalp]

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.

[Olivier GALLIEN · Accepted solution]

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