netdev - Re: [PATCH v4 04/10] ARM: dts: sun8i-h3: Add dt node for the syscon control module

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Date:   Tue, 11 Oct 2016 11:39:35 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Jean-Francois Moine <moinejf@...e.fr>
Cc:     Corentin Labbe <clabbe.montjoie@...il.com>, mark.rutland@....com,
        andrew@...n.ch, f.fainelli@...il.com, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, wens@...e.org, robh+dt@...nel.org,
        davem@...emloft.net, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 04/10] ARM: dts: sun8i-h3: Add dt node for the syscon
 control module

On Mon, Oct 10, 2016 at 02:50:21PM +0200, Jean-Francois Moine wrote:
> On Mon, 10 Oct 2016 14:31:51 +0200
> Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:
> 
> > Hi,
> > 
> > On Fri, Oct 07, 2016 at 10:25:51AM +0200, Corentin Labbe wrote:
> > > This patch add the dt node for the syscon register present on the
> > > Allwinner H3.
> > > 
> > > Only two register are present in this syscon and the only one useful is
> > > the one dedicated to EMAC clock.
> > > 
> > > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> > > ---
> > >  arch/arm/boot/dts/sun8i-h3.dtsi | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > > 
> > > diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> > > index 8a95e36..1101d2f 100644
> > > --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> > > +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> > > @@ -140,6 +140,11 @@
> > >  		#size-cells = <1>;
> > >  		ranges;
> > >  
> > > +		syscon: syscon@...00000 {
> > > +			compatible = "syscon";
> > 
> > It would be great to have a more specific compatible here in addition
> > to the syscon, like "allwinner,sun8i-h3-system-controller".
> 
> The System Control area is just like the PRCM area: it would be simpler
> to define the specific registers in the associated drivers.

Until you actually have to share those registers between different
devices, and then you're just screwed.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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