linux-kernel - Re: [PATCH v9 1/5] ARM: add basic support for Trusted Foundations

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Message-ID: <2702565.PHk13m6fVo@flatron>
Date:	Tue, 29 Oct 2013 00:31:36 +0100
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Olof Johansson <olof@...om.net>, Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <Mark.Rutland@....com>,
	devicetree@...r.kernel.org, Kevin Hilman <khilman@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>, Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	linux-tegra@...r.kernel.org, Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v9 1/5] ARM: add basic support for Trusted Foundations

On Monday 28 of October 2013 14:56:49 Olof Johansson wrote:
> On Mon, Oct 28, 2013 at 05:57:04AM -0500, Kumar Gala wrote:
> > On Oct 28, 2013, at 5:28 AM, Alexandre Courbot wrote:
> > > Trusted Foundations is a TrustZone-based secure monitor for ARM that
> > > can be invoked using the same 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.
> > > 
> > > Note: The API followed by Trusted Foundations does *not* follow the
> > > SMC
> > > calling conventions. It has nothing to do with PSCI neither and is
> > > only
> > > relevant to devices that use Trusted Foundations (like most
> > > Tegra-based
> > > retail devices).
> > > 
> > > Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> > > Reviewed-by: Tomasz Figa <t.figa@...sung.com>
> > > Reviewed-by: Stephen Warren <swarren@...dia.com>
> > > ---
> > > .../arm/firmware/tl,trusted-foundations.txt        | 20 ++++++
> > > .../devicetree/bindings/vendor-prefixes.txt        |  1 +
> > > arch/arm/Kconfig                                   |  2 +
> > > arch/arm/Makefile                                  |  1 +
> > > arch/arm/firmware/Kconfig                          | 28 ++++++++
> > > arch/arm/firmware/Makefile                         |  1 +
> > > arch/arm/firmware/trusted_foundations.c            | 79
> > > ++++++++++++++++++++++ arch/arm/include/asm/trusted_foundations.h  
> > >       | 67 ++++++++++++++++++ 8 files changed, 199 insertions(+)
> > > create mode 100644
> > > Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundatio
> > > ns.txt create mode 100644 arch/arm/firmware/Kconfig
> > > create mode 100644 arch/arm/firmware/Makefile
> > > create mode 100644 arch/arm/firmware/trusted_foundations.c
> > > create mode 100644 arch/arm/include/asm/trusted_foundations.h
> > > 
> > > diff --git
> > > a/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundat
> > > ions.txt
> > > b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundat
> > > ions.txt new file mode 100644
> > > index 0000000..2ec75c9
> > > --- /dev/null
> > > +++
> > > b/Documentation/devicetree/bindings/arm/firmware/tl,trusted-foundat
> > > ions.txt @@ -0,0 +1,20 @@
> > > +Trusted Foundations
> > > +-------------------
> > > +
> > > +Boards that use the Trusted Foundations secure monitor can signal
> > > its
> > > +presence by declaring a node compatible with
> > > "tl,trusted-foundations"
> > > +under the /firmware/ node
> > > +
> > > +Required properties:
> > > +- compatible : "tl,trusted-foundations"
> > > +- version-major : major version number of Trusted Foundations
> > > firmware
> > > +- version-minor: minor version number of Trusted Foundations
> > > firmware
> > 
> > vendor prefix version.
> 
> Are you saying he should use tl,version-major tl,version-minor? For
> bindings that are already vendor-specific we haven't (on ARM) asked for
> vendor prefix on properties. It doesn't mean that we should keep going
> down that route though, so I'm just asking for clarification for my own
> edification. :)

This is a good question. We should decide what the right thing (TM) is and 
write it down. I, on the contrary, was convinced that it's the way Kumar 
says.

Best regards,
Tomasz

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