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

From: Maxime Ripard
Date: Tue Oct 11 2016 - 05:51:29 EST


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@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxx>
> > > ---
> > > 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@01c00000 {
> > > + 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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