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

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Message-ID: <55F89D93.4080608@kernel.org>
Date:	Tue, 15 Sep 2015 17:37:07 -0500
From:	Rob Herring <robh@...nel.org>
To:	Jens Wiklander <jens.wiklander@...aro.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 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.

>  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.

> +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
> 

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