linux-kernel - RE: [PATCH 5/6] dt-bindings: crypto: Add bindings for Starfive crypto driver

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Date:   Tue, 6 Dec 2022 08:35:09 +0000
From:   JiaJie Ho <jiajie.ho@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: RE: [PATCH 5/6] dt-bindings: crypto: Add bindings for Starfive crypto
 driver



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Thursday, December 1, 2022 5:27 PM
> To: JiaJie Ho <jiajie.ho@...rfivetech.com>; Herbert Xu
> <herbert@...dor.apana.org.au>; David S . Miller <davem@...emloft.net>;
> Rob Herring <robh+dt@...nel.org>; Krzysztof Kozlowski
> <krzysztof.kozlowski+dt@...aro.org>
> Cc: linux-crypto@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-riscv@...ts.infradead.org
> Subject: Re: [PATCH 5/6] dt-bindings: crypto: Add bindings for Starfive crypto
> driver
> 
> On 01/12/2022 10:01, JiaJie Ho wrote:
> 
> >>> +
> >>> +  enable-side-channel-mitigation:
> >>> +    description: Enable side-channel-mitigation feature for AES module.
> >>> +        Enabling this feature will affect the speed performance of
> >>> +        crypto engine.
> >>> +    type: boolean
> >>
> >> Why exactly this is a hardware (DT) property, not runtime?
> >>
> >
> > This is a hardware setting provided in StarFive crypto engine only.
> > The crypto API doesn't control this setting during runtime and leaving this
> always on will impact speed performance.
> > So, I added this property to allow user to control this in dtb.
> 
> Devicetree should not describe policies, so without justification it does not
> look like hardware property. Drop.
> 
I'll remove this in v2 and set the value using module param instead.
Thanks.

Best regards,
Jia Jie