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

[Hadar Gat]

Hi Geert,

> From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Sent: Monday, 20 April 2020 12:35
> 
> Hi Hadar,
> 
> 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).
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