Re: [PATCH v7 0/3] hw_random: introduce Arm CryptoCell TRNG driver

[Geert Uytterhoeven]

Hi Hadar,

On Mon, Apr 20, 2020 at 2:27 PM Hadar Gat <Hadar.Gat@xxxxxxx> wrote:
> > From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> > Sent: Monday, 20 April 2020 12:35
> >
> > On Fri, Mar 27, 2020 at 7:11 AM Hadar Gat <hadar.gat@xxxxxxx> 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@xxxxxxxxxxxxxx

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