linux-kernel - Re: [PATCH v4 2/3] dt-bindings: rng: add bindings for MediaTek ARMv8 SoCs

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Date:   Mon, 22 Jul 2019 11:13:20 -0600
From:   Rob Herring <robh@...nel.org>
To:     Neal Liu <neal.liu@...iatek.com>
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...nel.org>,
        Crystal Guo <Crystal.Guo@...iatek.com>,
        linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v4 2/3] dt-bindings: rng: add bindings for MediaTek ARMv8
 SoCs

On Mon, Jun 24, 2019 at 03:24:11PM +0800, Neal Liu wrote:
> Document the binding used by the MediaTek ARMv8 SoCs random
> number generator with TrustZone enabled.
> 
> Signed-off-by: Neal Liu <neal.liu@...iatek.com>
> ---
>  .../devicetree/bindings/rng/mtk-sec-rng.txt        |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rng/mtk-sec-rng.txt
> 
> diff --git a/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt b/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt
> new file mode 100644
> index 0000000..c04ce15
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt
> @@ -0,0 +1,10 @@
> +MediaTek random number generator with TrustZone enabled
> +
> +Required properties:
> +- compatible : Should be "mediatek,mtk-sec-rng"

What's the interface to access this? 

A node with a 'compatible' and nothing else is a sign of something that 
a parent device should instantiate and doesn't need to be in DT. IOW, 
what do complete bindings for firmware functions look like?

> +
> +Example:
> +
> +hwrng: hwrng {
> +	compatible = "mediatek,mtk-sec-rng";
> +}
> -- 
> 1.7.9.5
>