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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Mon, 20 Apr 2020 15:45:28 +0200
Message-ID: <CAMuHMdV1Lp0uEOm_KtUA-nF7-6y1kfyvArcunrLipp6h5A_GMw@mail.gmail.com>
Subject: Re: [PATCH v7 0/3] hw_random: introduce Arm CryptoCell TRNG driver
To:     Hadar Gat <Hadar.Gat@arm.com>
Cc:     Matt Mackall <mpm@selenic.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <Mark.Rutland@arm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Alexander Sverdlin <alexander.sverdlin@nokia.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tomer Maimon <tmaimon77@gmail.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Zaibo Xu <xuzaibo@huawei.com>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Gilad Ben-Yossef <gilad@benyossef.com>,
        Ofir Drang <Ofir.Drang@arm.com>, nd <nd@arm.com>
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Hi Hadar,

On Mon, Apr 20, 2020 at 2:27 PM Hadar Gat <Hadar.Gat@arm.com> wrote:
> > From: Geert Uytterhoeven <geert@linux-m68k.org>
> > Sent: Monday, 20 April 2020 12:35
> >
> > On Fri, Mar 27, 2020 at 7:11 AM Hadar Gat <hadar.gat@arm.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).

OK.

> These are separate engines with some sharing in logic and interface.

Do they share the same register block?

> cctrng engine may not always be present.

I assume that applies to e.g. the older 630p?

> The devicetree documentation is in:
> For ccree - Documentation/devicetree/bindings/crypto/arm-cryptocell.txt
> For cctrng - Documentation/devicetree/bindings/rng/arm-cctrng.yaml

Thank you, I had already read both documents.


Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds