linux-kernel - Re: [PATCH 08/15] ARM/arm64: sunxi: Move H3/H5 syscon label over to soc-specific nodes

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Date:   Fri, 16 Nov 2018 17:47:50 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devel@...verdev.osuosl.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-sunxi@...glegroups.com, Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 08/15] ARM/arm64: sunxi: Move H3/H5 syscon label over to
 soc-specific nodes

On Fri, Nov 16, 2018 at 5:39 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Thu, Nov 15, 2018 at 03:50:06PM +0100, Paul Kocialkowski wrote:
> > Now that we have specific nodes for the H3 and H5 system-controller
> > that allow proper access to the EMAC clock configuration register,
> > we no longer need a common dummy syscon node.
> >
> > Switch the syscon label over to each platform's dtsi file.
> >
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  arch/arm/boot/dts/sun8i-h3.dtsi              | 2 +-
> >  arch/arm/boot/dts/sunxi-h3-h5.dtsi           | 6 ------
> >  arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi | 2 +-
> >  3 files changed, 2 insertions(+), 8 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> > index 7157d954fb8c..b337a9282783 100644
> > --- a/arch/arm/boot/dts/sun8i-h3.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> > @@ -134,7 +134,7 @@
> >       };
> >
> >       soc {
> > -             system-control@...0000 {
> > +             syscon: system-control@...0000 {
> >                       compatible = "allwinner,sun8i-h3-system-control";
> >                       reg = <0x01c00000 0x1000>;
> >                       #address-cells = <1>;
> > diff --git a/arch/arm/boot/dts/sunxi-h3-h5.dtsi b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > index 4b1530ebe427..9175ff0fb59a 100644
> > --- a/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > +++ b/arch/arm/boot/dts/sunxi-h3-h5.dtsi
> > @@ -152,12 +152,6 @@
> >                       };
> >               };
> >
> > -             syscon: syscon@...0000 {
> > -                     compatible = "allwinner,sun8i-h3-system-controller",
> > -                             "syscon";
> > -                     reg = <0x01c00000 0x1000>;
> > -             };
> > -
>
> You're also dropping the syscon compatible there. But I'm not sure how
> it could work with the H3 EMAC driver that would overwrite the
> compatible already.

I assume you are referring to the previous patch? The node names are not
the same, hence the previous patch is adding another node for the system
controller, and this patch removes the old one with the "syscon" compatible.

We already patched the EMAC driver to support the new SRAM controller based
regmap, so other than making people unhappy about having to update their
DT, I don't think there would be any problems. This also means H3 in -next
currently has _two_ syscon nodes.

ChenYu