linux-kernel - Re: [PATCH v4 28/33] dt-bindings: crypto: rockchip: convert to new driver bindings

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Date:   Sun, 3 Apr 2022 20:58:32 +0200
From:   LABBE Corentin <clabbe@...libre.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     heiko@...ech.de, herbert@...dor.apana.org.au, krzk+dt@...nel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 28/33] dt-bindings: crypto: rockchip: convert to new
 driver bindings

Le Sat, Apr 02, 2022 at 02:07:26PM +0200, Krzysztof Kozlowski a écrit :
> On 02/04/2022 13:53, Krzysztof Kozlowski wrote:
> > On 01/04/2022 22:17, Corentin Labbe wrote:
> >> The latest addition to the rockchip crypto driver need to update the
> >> driver bindings.
> >>
> >> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> >> ---
> >>  .../crypto/rockchip,rk3288-crypto.yaml        | 68 +++++++++++++++++--
> >>  1 file changed, 63 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/crypto/rockchip,rk3288-crypto.yaml b/Documentation/devicetree/bindings/crypto/rockchip,rk3288-crypto.yaml
> >> index 66db671118c3..e6c00bc8bebf 100644
> >> --- a/Documentation/devicetree/bindings/crypto/rockchip,rk3288-crypto.yaml
> >> +++ b/Documentation/devicetree/bindings/crypto/rockchip,rk3288-crypto.yaml
> >> @@ -11,8 +11,18 @@ maintainers:
> >>  
> >>  properties:
> >>    compatible:
> >> -    enum:
> >> -      - rockchip,rk3288-crypto
> >> +    oneOf:
> >> +      - description: crypto IP present on RK3288 SoCs
> >> +        items:
> >> +          - const: rockchip,rk3288-crypto
> >> +      - description: crypto IP present on RK3328 SoCs
> > 
> > These two comments are not helping, so this should be just enum.
> > 
> >> +        items:
> >> +          - const: rockchip,rk3328-crypto
> >> +      - description: crypto IPs present on RK3399. crypto0 is the first IP with
> >> +                     RSA support, crypto1 is the second IP without RSA.
> > 
> > The second part of this comment is helpful, first not. You have chosen
> > enum in your first patch, so just extend it with comments. Additionally
> > indexing does not scale. What if next generation reverses it and crypto0
> > does not have RSA and crypto1 has?
> 
> Actually let me re-think this. Is programming model (registers?) same
> between crypto0 and crypto1? If yes, this should be same compatible and
> add a dedicated property "rockchip,rsa"?
> 
> I looked at your driver and you modeled it as main and sub devices. I
> wonder why - are there some dependencies? It would be helpful to have
> such information here in commit msg as well. Your commit #26 says that
> only difference is the RSA.
> 

Hello

There is no dependency, my only problem is that only one of 2 instance need to register crypto algos.
The only perfect way is to have a list_head of devices, but I found this a bit complex/overkill.
I understand my current way is not ideal, I will probably try this other way. In that case, yes problably the 2 node need to have the same compatible (and only a future rockchip,rsa will permit to distinct where RSA is).

Regards