Dear ST Community,
We are working with the STM32MP257F-EV1 evaluation board and using the Yocto Distribution Package for our software stack.
Currently, the STPMIC2 is managed entirely by the secure world (TF-A and OP-TEE) on the Cortex-A35 side.
Our goal is to access STPMIC2 from the Cortex-M33 core running in non-secure mode with read-only access.
We would like to confirm:
Is it possible to allow secure access from A35 (TF-A/OP-TEE) and read-only, non-secure access from M33 to the STPMIC2 simultaneously?
If yes: could you please share the recommended steps or configuration changes to implement this?
If not:
We are considering moving PMIC control to the non-secure world (U-Boot or Linux) instead of TF-A/OP-TEE.
In this case, could you please provide guidance on how to disable PMIC access in the secure world and enable it in U-Boot or Linux?
Also, does U-Boot or the Linux kernel include support for the STPMIC2 driver?
Any insights or references to relevant documentation would be greatly appreciated.
Thanks and Regards,
Ishan
