linux-kernel - Re: [PATCH 6/8] ARM: dts: stm32: enable optee firmware and SCMI support on STM32MP15

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Date:   Mon, 25 Apr 2022 10:19:40 +0000
From:   Etienne CARRIERE <etienne.carriere@...com>
To:     Marek Vasut <marex@...x.de>,
        Alexandre TORGUE - foss <alexandre.torgue@...s.st.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "soc@...nel.org" <soc@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: Re: [PATCH 6/8] ARM: dts: stm32: enable optee firmware and SCMI
 support on STM32MP15

Hello Marek,

> From: Marek Vasut <marex@...x.de>
> 
> > On 4/22/22 17:09, Alexandre Torgue wrote:
> > Enable optee and SCMI clocks/reset protocols support.
> > 
> > Signed-off-by: Alexandre Torgue <alexandre.torgue@...s.st.com>
> > 
> > diff --git a/arch/arm/boot/dts/stm32mp151.dtsi
> > b/arch/arm/boot/dts/stm32mp151.dtsi
> > index 7fdc324b3cf9..1b2fd3426a81 100644
> > --- a/arch/arm/boot/dts/stm32mp151.dtsi
> > +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> > @@ -115,6 +115,33 @@
> >                status = "disabled";
> >        };
> >   
> > +     firmware {
> > +             optee: optee {
> > +                     compatible = "linaro,optee-tz";
> > +                     method = "smc";
> > +                     status = "disabled";
> > +             };
> 
> Doesn't this TEE node get automatically generated and patched into DT by 
> the TEE ? I think OpTee-OS does that.

OP-TEE OS does that if it gets passed the DT from early boot stage which is not always the case.

Etienne