linux-kernel - Re: [PATCH v2] ARM: dts: sun5i: Add dts for inet86v

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Date:   Wed, 3 Feb 2021 10:21:03 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     agriveaux <agriveaux@...tnet.info>
Cc:     robh+dt@...nel.org, mark.rutland@....com, wens@...e.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2] ARM: dts: sun5i: Add dts for inet86v_rev2

On Mon, Feb 01, 2021 at 06:18:18PM +0100, agriveaux wrote:
> On Thu, Jan 28, 2021 at 06:23:29PM +0100, Maxime Ripard wrote:
> > Hi,
> Hi,
> > 
> > On Sun, Jan 24, 2021 at 08:39:03PM +0100, Alexandre GRIVEAUX wrote:
> > > Add Inet 86V Rev 2 support, based upon Inet 86VS.
> > > 
> > > The Inet 86V use SL1536 touchpanel controller, the Inet 86VS a GSL1680,
> > > which make them both incompatible.
> > > 
> > > Missing things:
> > > - Accelerometer (MXC6225X)
> > > - Touchpanel (Sitronix SL1536)
> > > - Nand (29F32G08CBACA)
> > > - Camera (HCWY0308)
> > > 
> > > Signed-off-by: Alexandre GRIVEAUX <agriveaux@...tnet.info>
> > > ---
> > >  arch/arm/boot/dts/sun5i-a13-inet-86v-rev2.dts | 17 +++++++++++++++++
> > 
> > You have to add it to the Makefile
> > 
> Ok.
> > >  1 file changed, 17 insertions(+)
> > >  create mode 100644 arch/arm/boot/dts/sun5i-a13-inet-86v-rev2.dts
> > > 
> > > diff --git a/arch/arm/boot/dts/sun5i-a13-inet-86v-rev2.dts b/arch/arm/boot/dts/sun5i-a13-inet-86v-rev2.dts
> > > new file mode 100644
> > > index 000000000000..581083e932d8
> > > --- /dev/null
> > > +++ b/arch/arm/boot/dts/sun5i-a13-inet-86v-rev2.dts
> > > @@ -0,0 +1,17 @@
> > > +// SPDX-License-Identifier: GPL-2.0+
> > > +/*
> > > + * Copyright 2021 Alexandre Griveaux <agriveaux@...tnet.info>
> > > + *
> > > + * Minimal dts file for the iNet 86V
> > > + */
> > > +
> > > +/dts-v1/;
> > > +
> > > +#include "sun5i-a13.dtsi"
> > > +#include "sun5i-reference-design-tablet.dtsi"
> > > +
> > > +/ {
> > > +	model = "iNET 86V Rev 02";
> > > +	compatible = "inet,86v-rev2", "allwinner,sun5i-a13";
> > 
> > inet should be documented in the vendor prefixes, and that compatible
> > should be documented in Documentation/devicetree/bindings/arm/sunxi.yaml
> > 
> 
> I forgot, but should be:
> 
>       - description: iNet-86V Rev 02
>         items:
>           - const: primux,inet86v-rev2
>           - const: allwinner,sun5i-a13
> 
> > Having the first rev compatible would be good too
> 
> Unfortunatly, I didn't find inet86v rev1 on FCC website and on
> linux-sunxi. 
> 
> > 
> > > +
> > > +};
> > 
> > But I'm wondering. If there's nothing here to add, why would we need
> > that DT in the first place?
> > 
> I prefer to add often instead of bulk adding, and to show there are some
> board to add missing things like those above.

Yeah, I get that, but the point really is that you're not really adding
anything here except an empty device tree.

Maxime

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