linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: stm32: don't mix SCMI and non-SCMI board compatibles

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Date:   Mon, 27 Nov 2023 14:36:49 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        devicetree@...r.kernel.org,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        kernel@...gutronix.de
Subject: Re: [PATCH 1/2] dt-bindings: arm: stm32: don't mix SCMI and non-SCMI
 board compatibles


On Wed, 22 Nov 2023 19:52:33 +0100, Ahmad Fatoum wrote:
> SCMI-enabled boards may restrict access to resources like clocks, resets
> and regulators to the secure world.
> 
> A normal world bootloader or kernel compatible with the non-SCMI-enabled
> board is thus not guaranteed to be able to deal with the SCMI variant.
> 
> It follows, that the SCMI-enabled board is not compatible with the
> non-SCMI enabled board, so drop that compatible.
> 
> This change is motivated by the barebox' bootloader's use of bootloader
> specification files[1][2]: barebox for non-SCMI DK2 will compare its
> own top-level "stm32mp157c-dk2" compatible with all compatibles
> listed in the device tree referenced by each bootloader spec file.
> If the boot medium contains a configuration with
> compatible = "st,stm32mp157c-dk2-scmi", "st,stm32mp157c-dk2", "st,stm32mp157";
> it will match, because of the second compatible and boot a kernel with
> SCMI enabled, although no SCMI may exist on the platform.
> 
> [1]: https://uapi-group.org/specifications/specs/boot_loader_specification/
> [2]: https://www.barebox.org/doc/latest/user/booting-linux.html#boot-loader-specification
> 
> Fixes: 8e14ebb1f08f ("dt-bindings: arm: stm32: Add SCMI version of STM32 boards (DK1/DK2/ED1/EV1)")
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> ---
>  .../devicetree/bindings/arm/stm32/stm32.yaml     | 16 +++-------------
>  1 file changed, 3 insertions(+), 13 deletions(-)
> 

Acked-by: Rob Herring <robh@...nel.org>