linux-kernel - Re: [PATCH] ARM: dts: sun7i: add pinctrl for missing uart mux options

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Date:   Wed, 20 Feb 2019 10:06:17 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Mans Rullgard <mans@...sr.com>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: sun7i: add pinctrl for missing uart mux options

On Wed, Feb 20, 2019 at 04:58:49PM +0800, Chen-Yu Tsai wrote:
> On Sun, Feb 17, 2019 at 2:21 AM Mans Rullgard <mans@...sr.com> wrote:
> >
> > This adds pinctrl settings for various missing uart options.
> >
> > Signed-off-by: Mans Rullgard <mans@...sr.com>
> > ---
> >  arch/arm/boot/dts/sun7i-a20.dtsi | 45 ++++++++++++++++++++++++++++++++
> >  1 file changed, 45 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> > index af5b067a5f83..2295ff5adf48 100644
> > --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> > +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> > @@ -944,6 +944,31 @@
> >                                 function = "uart0";
> >                         };
> >
> > +                       uart0_pf_pins: uart0-pf-pins {
> > +                               pins = "PF2", "PF4";
> > +                               function = "uart0";
> > +                       };
> 
> We've had the policy of not adding pinctrl nodes that aren't used in-tree,
> to avoid bloating up the blob size. However DTC 1.4.7 introduced the new
> /omit-if-no-ref/ directive, which would make the compiler discard marked
> nodes if they aren't referenced.
> 
> So please add this to all the new nodes. It seems to work regardless whether
> you add it before or after the label, though having it after the label seems
> to make vim syntax highlighting happier.

It also works (both for dtc and vim) if we put it on the previous
line, so something like:

/omit-if-no-ref/
uart0_pf_pins: uart0-pf-pins {
};

And it does have the advantage of keeping the same line width, which
could get pretty long on some nodes.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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