Date: Tue, 10 Sep 2013 14:04:31 +0100
From: Will Deacon <will.deacon@arm.com>
To: Alexandre Courbot <gnurou@gmail.com>
Cc: Rob Herring <robherring2@gmail.com>, Mark Rutland <Mark.Rutland@arm.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        Kevin Hilman <khilman@linaro.org>,
        Russell King <linux@arm.linux.org.uk>, Arnd Bergmann <arnd@arndb.de>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Tomasz Figa <t.figa@samsung.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
        Alexandre Courbot <acourbot@nvidia.com>,
        Olof Johansson <olof@lixom.net>, Dave P Martin <Dave.Martin@arm.com>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v5 1/5] ARM: add basic Trusted Foundations support
Message-ID: <20130910130431.GE27966@mudshark.cambridge.arm.com>
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Hi guys,

On Mon, Sep 09, 2013 at 07:15:31AM +0100, Alexandre Courbot wrote:
> On Fri, Sep 6, 2013 at 3:35 AM, Rob Herring <robherring2@gmail.com> wrote:
> > On 09/04/2013 10:27 PM, Alexandre Courbot wrote:
> >> Trusted Foundations is a TrustZone-based secure monitor for ARM that
> >> can be invoked  using a consistent SMC-based API on all supported
> >> platforms. This patch adds initial basic support for Trusted
> >> Foundations using the ARM firmware API. Current features are limited
> >> to the ability to boot secondary processors.

[...]

> >> +Example:
> >> +     firmware {
> >> +             compatible = "tl,trusted-foundations";
> >> +             version-major = <2>;
> >> +             version-minor = <8>;
> >> +     };
> >
> > I'm wondering how we fit this in with PSCI bindings? Both are pieces of
> > firmware functionality and may co-exist. There's nothing incompatible
> > here, but there should be some commonality. Will future versions of
> > Trusted Foundations follow the SMC calling conventions doc? What about
> > armv8 support.
> 
> I don't have any information about the future of TF unfortunately,
> excepted that it should remain backward-compatible. What is this SMC
> calling convention doc your are talking about btw? Is there a standard
> calling convention defined by ARM?

SMC calling convention:

https://silver.arm.com/download/download.tm?pv=1435186

PSCI:

https://silver.arm.com/download/download.tm?pv=1421585

Although access to these documents requires you to go through a
click-through license.

Will
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