linux-kernel - Re: [PATCH v1 2/3] dt-bindings: crypto: document Exynos5433 SlimSSS

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Message-ID: <CAJKOXPfGJxzPVcAitU=uDFfrmtwQZD1dcbbhy+BjEUF_6exx2g@mail.gmail.com>
Date:   Wed, 23 Jan 2019 08:59:56 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Kamil Konieczny <k.konieczny@...tner.samsung.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v1 2/3] dt-bindings: crypto: document Exynos5433 SlimSSS

On Tue, 22 Jan 2019 at 16:26, Kamil Konieczny
<k.konieczny@...tner.samsung.com> wrote:
>
> Document DT bindings for crypto Samsung Exynos5433 SlimSSS (Slim Security
> SubSystem) IP.
>
> Signed-off-by: Kamil Konieczny <k.konieczny@...tner.samsung.com>
> ---
>  .../devicetree/bindings/crypto/samsung-sss.txt      | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> index 7a5ca56683cc..75718f86fe50 100644
> --- a/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> +++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> @@ -1,4 +1,4 @@
> -Samsung SoC SSS (Security SubSystem) module
> +Samsung SoC SSS (Security SubSystem) and SlimSSS module
>
>  The SSS module in S5PV210 SoC supports the following:
>  -- Feeder (FeedCtrl)
> @@ -15,6 +15,11 @@ supports the following also:
>  -- True Random Number Generator (TRNG)
>  -- Secure Key Manager
>
> +The SlimSSS module in Exynos5 (Exynos5433) supports:
> +-- Feeder (FeedCtrl)
> +-- Advanced Encryption Standard (AES)
> +-- SHA-1/SHA-256/HMAC (SHA-1/SHA-256)
> +
>  Required properties:
>
>  - compatible : Should contain entries for this and backward compatible
> @@ -22,11 +27,13 @@ Required properties:
>    - "samsung,s5pv210-secss" for S5PV210 SoC.
>    - "samsung,exynos4210-secss" for Exynos4210, Exynos4212, Exynos4412, Exynos5250,
>                 Exynos5260 and Exynos5420 SoCs.
> +  - "samsung,exynos5433-slim-sss" for Exynos542x and Exynos5433 SoCs.

For Exynos5420 there is a driver for regular/full SSS module. It would
be nice to explain what is the difference between them and/or mention
potential conflicts of usage.

The point is that previously we added drivers/bindings for SSS and now
you use the other interface. It might be pretty confusing for users...

Best regards,
Krzysztof

>  - reg : Offset and length of the register set for the module
>  - interrupts : interrupt specifiers of SSS module interrupts (one feed
>                 control interrupt).
>
>  - clocks : list of clock phandle and specifier pairs for all clocks  listed in
>                 clock-names property.
> -- clock-names : list of device clock input names; should contain one entry
> -               "secss".
> +- clock-names : list of device clock input names; should contain "pclk" and
> +               "aclk" for slim-sss in Exynos5433, and one entry "secss" for
> +               other compatibles.
> --
> 2.20.0
>