linux-kernel - Re: [PATCH 1/2] dt-bindings: crypto: update ccree optional params

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Date:   Tue, 22 Sep 2020 19:57:02 -0600
From:   Rob Herring <robh@...nel.org>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ofir Drang <ofir.drang@....com>, linux-crypto@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: crypto: update ccree optional params

On Wed, Sep 16, 2020 at 10:19:49AM +0300, Gilad Ben-Yossef wrote:
> Document ccree driver supporting new optional parameters allowing to
> customize the DMA transactions cache parameters and ACE bus sharability
> properties.
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> ---
>  Documentation/devicetree/bindings/crypto/arm-cryptocell.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/crypto/arm-cryptocell.txt b/Documentation/devicetree/bindings/crypto/arm-cryptocell.txt
> index 6130e6eb4af8..1a1603e457a8 100644
> --- a/Documentation/devicetree/bindings/crypto/arm-cryptocell.txt
> +++ b/Documentation/devicetree/bindings/crypto/arm-cryptocell.txt
> @@ -13,6 +13,10 @@ Required properties:
>  Optional properties:
>  - clocks: Reference to the crypto engine clock.
>  - dma-coherent: Present if dma operations are coherent.
> +- awcache: Set write transactions cache attributes
> +- arcache: Set read transactions cache attributes

dma-coherent already implies these are 011x, 101x or 111x. In my limited 
experience configuring these (Calxeda SATA and ethernet), writeback, 
write-allocate was pretty much always optimal. 

> +- awdomain: Set write transactions ACE sharability domain (712, 703, 713 only)
> +- ardomain: Set read transactions ACE sharability domain (712, 703, 713 only)

This probably needs something common. We may need something for Mali, 
too. I don't think different settings for read and write makes much 
sense nor does anything beyond IS or OS. 

These could also just be implied by the compatible string (and requiring 
an SoC specific one).

Rob