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Date:   Tue, 22 Nov 2022 14:29:03 +0100
From:   Corentin LABBE <clabbe@baylibre.com>
To:     Mikhail Rudenko <mike.rudenko@gmail.com>
Cc:     Robin Murphy <robin.murphy@arm.com>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Lin Jinhan <troy.lin@rock-chips.com>, wevsty <ty@wevs.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Lin Huang <hl@rock-chips.com>,
        Shawn Lin <shawn.lin@rock-chips.com>,
        linux-rockchip@lists.infradead.org
Subject: Re: [PATCH] hw_random: rockchip: import driver from vendor tree
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References: <20220919210025.2376254-1-Jason@zx2c4.com>
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Le Wed, Nov 16, 2022 at 09:04:07PM +0300, Mikhail Rudenko a ?crit :
> 
> On 2022-09-29 at 09:45 +02, LABBE Corentin <clabbe@baylibre.com> wrote:
> > Le Tue, Sep 27, 2022 at 11:39:17PM +0200, Aurelien Jarno a ?crit :
> >> On 2022-09-27 21:46, LABBE Corentin wrote:
> >> > Le Tue, Sep 27, 2022 at 06:37:53PM +0200, Aurelien Jarno a ?crit :
> >> > > On 2022-09-20 10:35, Robin Murphy wrote:
> >> > > > On 2022-09-19 22:00, Jason A. Donenfeld wrote:
> >> > > > > The Rockchip driver has long existed out of tree, but not upstream.
> >> > > > > There is support for it upstream in u-boot, but not in Linux proper.
> >> > > > > This commit imports the GPLv2 driver written by Lin Jinhan, together
> >> > > > > with the DTS and config blobs from Wevsty.
> >> > > >
> >> > > > Note that Corentin has a series enabling the full crypto driver for
> >> > > > RK3328 and RK3399[1], so it would seem more sensible to add TRNG support
> >> > > > to that. Having confliciting compatibles for the same hardware that
> >> > > > force the user to change their DT to choose one functionality or the
> >> > > > other isn't good (plus there's also no binding for this one).
> >> > >
> >> > > It might make sense for the cryptov1-rng driver (I haven't checked). For
> >> > > the cryptov2-rng driver, I looked at the RK3568 TRM (I can't find the
> >> > > RK3588 one), and from what I understand crypto and TRNG are two
> >> > > different devices, using different address spaces, clock, reset and
> >> > > interrupts. The vendor kernel uses two different drivers.
> >> > >
> >> >
> >> > I confirm that TRNG is not on the same IP on rk3568, something I didnt remark when doing my V2 driver. (I need to remove rng clock from rk3568 dt).
> >> > But the rk3588 crypto IP and the TRNG are in the same device.
> >>
> >> Ok, thanks for confirming about the rk3568. It seems the only one in the
> >> family with separate devices for TRNG and crypto. Does it means we need
> >> a separate TRNG driver only for it? Or could we handle it the same way
> >> than for instance rk3588 anyway?
> >
> > I just got now the part 1 of rk3588 TRM which I has missing and it show some conflicting information.
> > rk3588 seems to have both a dedicated TRNG (TRNG_NS/TRNG_S) with dedicated address space and a TRNG inside the crypto IP.
> > But for the moment, the TRNG inside crypto IP seems defective.
> 
> So what's the ultimate decision? Does anyone work on merging this into
> the existing crypto driver? I have a use case with an rk3399-based board,
> where having hardware rng enhances boot times dramatically (at least for
> some userspaces; see also [1]).
> 
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=216502
> 

Hello

I started to work on adding RNG to rk3288_crypto.
I need to publish the work on my github and take time to send it for review.

Regards