linux-kernel - Re: [PATCH 1/2] arm64: dts: mt8173: elm: Set uart0 to mmio32 iotype

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Date:   Thu, 10 Sep 2020 15:57:46 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm64: dts: mt8173: elm: Set uart0 to mmio32 iotype

On Thu, Sep 10, 2020 at 3:20 PM Enric Balletbo i Serra
<enric.balletbo@...labora.com> wrote:
>
> Hi Hsin-Yi,
>
> On 10/9/20 7:46, Hsin-Yi Wang wrote:
> > Set uart0 iotype to mmio32 to make earlycon work with stdout-path.
> >
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > ---
> >  arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> > index a5a12b2599a4a..d54e62f72c65d 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> > @@ -1160,6 +1160,8 @@ &thermal {
> >  };
> >
> >  &uart0 {
> > +     reg-io-width = <4>;
> > +     reg-shift = <2>;
>
> I am wondering if these properties are common enough to go to mt8173.dtsi
> instead of here.
>
Since stdout-path is set on elm.dtsi (using uart0), so I add this
attribute here.