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

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Date:   Wed, 18 Apr 2018 09:47:26 +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 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 ;-)

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?

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