STM32MP1 VBAT

[Ara.1]

how to use vbat in dtsi configuration for RTC back up,

i had checked in evk and dk1 and dk2 dtsi, no reference available.

any one please share you thoughts

[Olivier GALLIEN]

Hi @Ara.1​ 

I guess your question is similar to https://community.st.com/s/question/0D53W000009k9xfSAA/how-to-set-vsw-domain-for-stm32mp151c-custom-board-as-openstlinux-dts-for-using-retram

Actually this is not manage through dtsi. You need to patch TF-A in order to set in PWR_CR2, the bits RREN and BREN

Olivier

[Ara.1]

Hi Olivier,

Thanks i will check it ,

where can i get these information as a reference manual,

i have STM32MP157C/F data sheet, but i need these PWR_CR2 information , like reference manual, that would be helpful.

[Olivier GALLIEN]

Hi @Ara.1​ 

Please go through https://www.st.com/en/microcontrollers-microprocessors/stm32mp1-series.html#resource

It contains all technical literature around MP1 including of course RM

Olivier

[Ara.1]

is there any way in linux sdk support on

1. vbat battery healthy status check and battery voltage measurement
2. cpu temperature in *C
3. cpu frequency.

[Ara.1]

hi

anyone face this issue ?

[Olivier GALLIEN]

Hi @Ara.1​ 

Even if in same topic I would prefer you open a new post for your last comment rather than wake up this old one.

And for the original question , was my comment useful ?

Thanks,

Olivier

[Ara.1]

Yes Oliver your informative was useful, but i am seeing sysfs user space like /sys/ device or class info which can access in user space.

as this this is a right forum to ask question, so asked here