Re: [PATCH] hw_random: rockchip: import driver from vendor tree

[LABBE Corentin]

Le Tue, Sep 27, 2022 at 06:37:53PM +0200, Aurelien Jarno a écrit :
> 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.