[PATCH 0/4] stm32: add support for STM32MP25 BSEC to control OTP data

[Patrick Delaunay]

Non volatile memory area is available on STM32MP25 with OTP in BSEC.

The 12 Kbits of OTP (effective) for STM32MP25x SoC Family
are organized into the following regions:
- lower OTP (OTP0 to OTP127) = 4096 lower OTP bits,
  bitwise (1-bit) programmable
- mid OTP (OTP128 to OTP255) = 4096 middle OTP bits,
  bulk (32-bit) programmable
- upper OTP (OTP256 to OTP383) = 4096 upper OTP bits,
  bulk (32-bit) programmable,
  only accessible when BSEC is in closed state.

BSEC is only accessible by secure world, so the OTP access is done
by driver with OP-TEE TA, as on STM32MP13x family.



Patrick Delaunay (4):
  dt-bindings: nvmem: add new stm32mp25 compatible for stm32-romem
  nvmem: stm32: add support for STM32MP25 BSEC to control OTP data
  arm64: defconfig: enable NVMEM STM32 ROMEM for stm32mp25
  nvmem: add bsec support to stm32mp25

 .../bindings/nvmem/st,stm32-romem.yaml           |  1 +
 arch/arm64/boot/dts/st/stm32mp251.dtsi           | 16 ++++++++++++++++
 arch/arm64/configs/defconfig                     |  1 +
 drivers/nvmem/stm32-romem.c                      | 16 ++++++++++++++++
 4 files changed, 34 insertions(+)

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2.25.1