linux-kernel - Re: [PATCH 4/4] ARM: multi_v7_defconfig: Add SCMI regulator support

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Date:   Wed, 26 Jul 2023 11:33:15 +0200
From:   Patrick DELAUNAY <patrick.delaunay@...s.st.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <p.paillet@...s.st.com>, 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>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Russell King <linux@...linux.org.uk>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Etienne Carriere <etienne.carriere@...s.st.com>
Subject: Re: [PATCH 4/4] ARM: multi_v7_defconfig: Add SCMI regulator support

Hi,

On 7/12/23 21:25, Krzysztof Kozlowski wrote:
> On 12/07/2023 16:24, p.paillet@...s.st.com wrote:
>> From: Pascal Paillet <p.paillet@...s.st.com>
>>
>> Enable ARM SCMI regulator support.
>>
> This we see from the diff. Please explain why, e.g. which boards use it.
>
> Best regards,
> Krzysztof

The STM32MP platforms rely on OP-TEE to boot: Clocks and regulators are 
handled in
the secure world by OP-TEE and exported to the non secure world (LINUX)
thanks to ARM SCMI protocol.

Today it is used in the ARMv7 STMicrolectronics stm32mp boards:
- for STM32MP13: stm32mp135f-dk
- the STM32MP15 boards with SCMI variant, introduced by commit 5b7e58313a77
   ("ARM: dts: stm32: Add SCMI version of STM32 boards (DK1/DK2/ED1/EV1)")
   * stm32mp157c-ev1-scmi
   * stm32mp157c-ed1-scmi
   * stm32mp157c-dk2-scmi
   * stm32mp157a-dk1-scmi

This SCMI server provide access to "secured" resources protected in SoC
(for example with RCC_SECFGR); the resources need to be available early
for these board and the  SCMI server is associated with OP-TEE, already
activated by the commit 24c159793238  ("ARM: multi_v7_defconfig: Add
OPTEE support").

Regards

Patrick

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> linux-arm-kernel@...ts.infradead.org
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