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Date:   Tue, 27 Sep 2022 21:46:15 +0200
From:   LABBE Corentin <clabbe@baylibre.com>
To:     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>,
        Mikhail Rudenko <mike.rudenko@gmail.com>,
        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
Message-ID: <YzNTB+RQK6yITi7/@Red>
References: <20220919210025.2376254-1-Jason@zx2c4.com>
 <32f8797a-4b65-69df-ee8e-7891a6b4f1af@arm.com>
 <YzMm4d3sZBHpitm9@aurel32.net>
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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.