linux-kernel - Re: [PATCH v5 2/5] dt/bindings: add bindings for optee

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Date:	Wed, 16 Sep 2015 09:13:31 +0200
From:	Jens Wiklander <jens.wiklander@...aro.org>
To:	Rob Herring <robh@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>, valentin.manea@...wei.com,
	jean-michel.delorme@...com, emmanuel.michel@...com,
	javier@...igon.com,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Mark Rutland <mark.rutland@....com>,
	Michal Simek <michal.simek@...inx.com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v5 2/5] dt/bindings: add bindings for optee

On Tue, Sep 15, 2015 at 05:37:07PM -0500, Rob Herring wrote:
> On 08/19/2015 03:40 AM, Jens Wiklander wrote:
> > Introduces optee prefix and adds bindings for ARM TrustZone based OP-TEE
> > implementation.
> > 
> > Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> > ---
> >  Documentation/devicetree/bindings/optee/optee.txt     | 17 +++++++++++++++++
> 
> How about bindings/arm/firmware/... where the *other* TZ binding is located.

OK, I'll move it.

> 
> >  Documentation/devicetree/bindings/vendor-prefixes.txt |  1 +
> >  2 files changed, 18 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/optee/optee.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/optee/optee.txt b/Documentation/devicetree/bindings/optee/optee.txt
> > new file mode 100644
> > index 0000000..4a6ff10
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/optee/optee.txt
> > @@ -0,0 +1,17 @@
> > +OP-TEE Device Tree Bindings
> > +
> > +OP-TEE is a piece of software using hardware features to provide a Trusted
> > +Execution Environment. The security can be provided with ARM TrustZone, but
> > +also by virtualization or a separate chip. As there's no single OP-TEE
> 
> I don't see how the Linux side would not need to know what the
> communication channel is whether it is smc, hvc, or something else.

I assume you're missing something similar to the "method" property
defined for PSCI. I'll add that.

> 
> > +vendor we're using "optee" as the first part of compatible property,
> > +indicating the OP-TEE protocol is used when communicating with the secure
> > +world.
> > +
> > +* OP-TEE based on ARM TrustZone required properties:
> > +
> > +- compatible="optee,optee-tz"
> > +
> > +Example:
> > +	optee {
> > +		compatible="optee,optee-tz";
> > +	};
> > diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > index 8033919..17c2a7e 100644
> > --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> > +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> > @@ -141,6 +141,7 @@ nvidia	NVIDIA
> >  nxp	NXP Semiconductors
> >  onnn	ON Semiconductor Corp.
> >  opencores	OpenCores.org
> > +optee	OP-TEE, Open Portable Trusted Execution Environment
> >  ortustech	Ortus Technology Co., Ltd.
> >  ovti	OmniVision Technologies
> >  panasonic	Panasonic Corporation
> > 
> 

Thanks,
Jens
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