On Wed, Apr 18, 2018 at 10:47 AM, Geert Uytterhoeven
<geert@xxxxxxxxxxxxxx> wrote:
> Hi Gilad,
>
> On Wed, Apr 18, 2018 at 6:32 AM, Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> wrote:
>> On Tue, Apr 17, 2018 at 9:14 PM, Geert Uytterhoeven
>> <geert@xxxxxxxxxxxxxx> wrote:
>>> The ARM TrustZone CryptoCell is found on ARM SoCs only. Hence make it
>>> depend on ARM or ARM64, unless compile-testing.
>>
>> Actually it is not. Despite what the name suggest, CryptoCell is
>> designed by Arm but is
>> not in fact limited to Arm cores. I think the only requirement is
>> ability to provide an AMBA bus
>> interface. Kudos to our marketing department to make that so clear and
>> so on... :-)
>
> Good to know, I couldn't find any users of the compatible value in DT sources,
> so I had to guess... and missed ;-)
Yes, the original driver that went through staging was for CC 712,
which so new it doesn't yet
have a commercially available silicon yet :-)
I've added the older 710 and 613 support just recently and will be
working with CC hardware implementors
to add the relevant DT bindings for their respective SoCs
>
> Do you have a good suggestion for a platform dependency?
> Based on the above, I'd say "depends on ARM_AMBA || COMPILE_TEST",
> but (currently) ARM_AMBA is selected on ARM or ARM64 only?
So AMBA *as a system bus* is not strictly needed AFAIK in the sense
that you just need
an AMBA to whatever bus interface, so not all system implementing this
actually define ARM_AMBA.
It's actually safer for me to rule out certain architectures rather
than point to which are used.
I'd say ruling out s390, um, alpha, ia64 and m68k is a safe bet.
Do you want to send a patch or shall I?
Thanks,
Gilad
>
> 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
--
Gilad Ben-Yossef
Chief Coffee Drinker
"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
-- Jean-Baptiste Queru
