linux-kernel - RE: [PATCH v7 0/3] hw_random: introduce Arm CryptoCell TRNG driver

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Date:   Mon, 20 Apr 2020 12:27:07 +0000
From:   Hadar Gat <Hadar.Gat@....com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tomer Maimon <tmaimon77@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        Ofir Drang <Ofir.Drang@....com>, nd <nd@....com>
Subject: RE: [PATCH v7 0/3] hw_random: introduce Arm CryptoCell TRNG driver


Hi Geert,

> From: Geert Uytterhoeven <geert@...ux-m68k.org>
> Sent: Monday, 20 April 2020 12:35
> 
> Hi Hadar,
> 
> On Fri, Mar 27, 2020 at 7:11 AM Hadar Gat <hadar.gat@....com> wrote:
> > The Arm CryptoCell is a hardware security engine.
> > This patch introduces driver for its TRNG (True Random Number
> > Generator) engine.
> 
> Thanks for your series!
> 
> I am wondering what is the relation between this and
> Documentation/devicetree/bindings/crypto/arm-cryptocell.txt?

Arm TrustZone CryptoCell hardware contains both cryptographic engine (ccree) and true random number generator engine (cctrng).
These are separate engines with some sharing in logic and interface.
cctrng engine may not always be present.
The devicetree documentation is in:
For ccree - Documentation/devicetree/bindings/crypto/arm-cryptocell.txt
For cctrng - Documentation/devicetree/bindings/rng/arm-cctrng.yaml

> 
> Gr{oetje,eeting}s,
> 
>                         Geert

Hadar