linux-kernel - Re: [PATCH v3] riscv: dts: allwinner: d1: Add CAN controller nodes

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Date:   Sun, 13 Aug 2023 14:23:23 +1000
From:   John Watts <contact@...kia.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     linux-sunxi@...ts.linux.dev, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Maksim Kiselev <bigunclemax@...il.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] riscv: dts: allwinner: d1: Add CAN controller nodes

On Sun, Aug 13, 2023 at 12:17:27PM +0800, Chen-Yu Tsai wrote:
> > Signed-off-by: John Watts <contact@...kia.org>
> > ---
> > Changes in v3:
> > - Set default pinctrl for can controller
> > - Moved can nodes to proper location
> > - Moved can pins to proper location
> >
> >  .../boot/dts/allwinner/sunxi-d1s-t113.dtsi    | 34 +++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> >
> > diff --git a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > index d59b4acf183a..24f2e70d5886 100644
> > --- a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > +++ b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > @@ -52,6 +52,18 @@ pio: pinctrl@...0000 {
> >                         #gpio-cells = <3>;
> >                         #interrupt-cells = <3>;
> >
> > +                       /omit-if-no-ref/
> 
> Just FYI this likely ends up doing nothing if you also have them
> referenced through a default pinctrl setting. They end up always
> referenced and always included. For the D1 series it looks like no
> peripheral has default pinctrl setting given.
>
> We can still keep it though. It would help when future chip variants
> specify different pinmuxes.

Oops, thanks for pointing that out. I'll try to avoid that mistake in future.

> The compatible string should be the first property. In other sunxi SoC dtsi
> files, we put the pinctrl just before the "status" property if it's present
> to specify a default pin muxing.

Oh that makes sense.

> 
> I can fix it up while applying.

Please do!

> ChenYu

Thanks,

John.