linux-kernel - Re: [PATCH] arm64: dts: allwinner: a64: Add lradc node

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Message-ID: <20190604082806.smght44dmhuoxw2u@flea>
Date:   Tue, 4 Jun 2019 10:28:06 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: allwinner: a64: Add lradc node

On Mon, Jun 03, 2019 at 05:20:51PM +0200, Luca Weiss wrote:
> On Montag, 3. Juni 2019 09:42:47 CEST Maxime Ripard wrote:
> > Hi,
> >
> > On Fri, May 31, 2019 at 12:27:55PM +0200, Luca Weiss wrote:
> > > On Freitag, 24. Mai 2019 11:20:01 CEST Maxime Ripard wrote:
> > > > It would be great to drop the -keys from the compatible, and to
> > > > document the bindings
> > > >
> > > > Looks good otherwise
> > > >
> > > > Maxime
> > >
> > > So I should just document the "allwinner,sun50i-a64-lradc" string in
> > > Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt ? Don't I
> > > also
> > > have to add the compatible to the driver code then? Just adding the a64
> > > compatible to a dts wouldn't work without that.
> >
> > What I meant was that you needed both, something like:
> >
> > compatible = "allwinner,sun50i-a64-lradc", "allwinner,sun8i-a83t-lradc";
> >
> > That way, the OS will try to match a driver for the A64 compatible if
> > any, and fallback to the A83's otherwise. And since we don't have any
> > quirk at the moment, there's no change needed to the driver.
>
> sorry for the long back and forth, I hope I understood you correctly now.
> Here's what I would submit as v2 then (I'll split the two files into seperate
> patches as the devicetree documentation suggests)
>
> Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt:
>   - compatible: should be one of the following string:
>                 "allwinner,sun4i-a10-lradc-keys"
>                 "allwinner,sun8i-a83t-r-lradc"
> +               "allwinner,sun50i-a64-lradc", "allwinner,sun8i-a83t-r-lradc"
>
> arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi:
> +               lradc: lradc@...1800 {
> +                       compatible = "allwinner,sun50i-a64-lradc",
> +                                    "allwinner,sun8i-a83t-r-lradc";
> +                       reg = <0x01c21800 0x400>;
> +                       interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
> +                       status = "disabled";
> +               };
> +
>
> Thanks,
> Luca

That looks correct :)

Maxime

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

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