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

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Date:   Thu, 14 Dec 2023 17:28:40 +0100
From:   Alexandre TORGUE <alexandre.torgue@...s.st.com>
To:     Patrick Delaunay <patrick.delaunay@...s.st.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <quic_bjorande@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, Peng Fan <peng.fan@....com>,
        Udit Kumar <u-kumar1@...com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH 0/4] stm32: add support for STM32MP25 BSEC to control OTP
 data

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