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

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Date:   Sat, 2 Apr 2022 14:07:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Corentin Labbe <clabbe@...libre.com>, heiko@...ech.de,
        herbert@...dor.apana.org.au, krzk+dt@...nel.org, robh+dt@...nel.org
Cc:     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

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.

Best regards,
Krzysztof