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

From: Neal Liu <[email-masked]>
Date: Tue, 23 Jul 2019 10:21:05 +0800

Dear Rob,
	You can check my driver for detail:
	http://patchwork.kernel.org/patch/11012475/ or patchset 3/3

	This driver is registered as hardware random number generator, and
combines with rng-core.
	We want to add one rng hw based on the dts. Is this proper or do you
have other suggestion to meet this requirement?

	Thanks

On Tue, 2019-07-23 at 01:13 +0800, Rob Herring wrote:
> 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 <[email-masked]>
> > ---
> >  .../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
> > 
> 
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