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

Message ID 20231117143338.1173475-1-patrick.delaunay@foss.st.com
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Series stm32: add support for STM32MP25 BSEC to control OTP data | expand

Message

Patrick DELAUNAY Nov. 17, 2023, 2:33 p.m. UTC 
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(+)

Comments

Alexandre TORGUE Dec. 14, 2023, 4:28 p.m. UTC | #1 
Hi

On 11/17/23 15:33, Patrick Delaunay wrote:
> 
> 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(+)
> 


patch[4] (DT) applied on stm32-next.

thanks
Alex