linux-kernel - Re: [PATCH/RFC] crypto: Add platform dependencies for CRYPTO_DEV

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Date:   Mon, 23 Apr 2018 10:11:14 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC] crypto: Add platform dependencies for CRYPTO_DEV_CCREE

Hi Gilad,

On Mon, Apr 23, 2018 at 9:45 AM, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> On Wed, Apr 18, 2018 at 10:47 AM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
>> On Wed, Apr 18, 2018 at 6:32 AM, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
>>> On Tue, Apr 17, 2018 at 9:14 PM, Geert Uytterhoeven
>>> <geert@...ux-m68k.org> 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.

IC.

> 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?

Please send a patch, thanks!

(I don't want to be the one adding more negative architecture dependencies ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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