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Message-ID: <1563944642.13531.0.camel@mtkswgap22>
Subject: Re: [PATCH v4 2/3] dt-bindings: rng: add bindings for MediaTek
 ARMv8 SoCs
From:   Neal Liu <neal.liu@mediatek.com>
To:     Rob Herring <robh@kernel.org>
CC:     Mark Rutland <mark.rutland@arm.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        wsd_upstream <wsd_upstream@mediatek.com>,
        Sean Wang <sean.wang@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Crystal Guo =?UTF-8?Q?=28=E9=83=AD=E6=99=B6=29?= 
        <Crystal.Guo@mediatek.com>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        Matt Mackall <mpm@selenic.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "linux-mediatek@lists.infradead.org" 
        <linux-mediatek@lists.infradead.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
Date:   Wed, 24 Jul 2019 13:04:02 +0800
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On Tue, 2019-07-23 at 08:35 -0600, Rob Herring wrote:
> On Mon, Jul 22, 2019 at 8:21 PM Neal Liu <neal.liu@mediatek.com> wrote:
> >
> 
> Please don't top post to lists.
> 
> > Dear Rob,
> >         You can check my driver for detail:
> >         http://patchwork.kernel.org/patch/11012475/ or patchset 3/3
> 
> I could, or you could just answer my question.
> 
> >
> >         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?
> 
> It depends. There doesn't appear to be any resource configuration, so
> why does it need to be in DT. DT is not the only way instantiate
> drivers.
> 
> Rob

This hwrng is only supported on some chipsets. It needs DT to identify
which platform is supported or not. Is there any better idea to meet
this requirement?

Neal

> >
> >         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 <neal.liu@mediatek.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
> > > >
> > >
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
> >
> >