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

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Message-ID: <20190521142544.ma2xfu77bamk4hvc@flea>
Date:   Tue, 21 May 2019 16:25:44 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     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 Tue, May 21, 2019 at 03:52:47PM +0200, luca@...tu.xyz wrote:
> On May 21, 2019 3:09:55 PM GMT+02:00, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> >On Tue, May 21, 2019 at 08:43:45AM +0200, luca@...tu.xyz wrote:
> >> On May 20, 2019 1:07:42 PM GMT+02:00, Maxime Ripard
> ><maxime.ripard@...tlin.com> wrote:
> >> >On Sat, May 18, 2019 at 07:09:30PM +0200, Luca Weiss wrote:
> >> >> Add a node describing the KEYADC on the A64.
> >> >>
> >> >> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> >> >> ---
> >> >>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 7 +++++++
> >> >>  1 file changed, 7 insertions(+)
> >> >>
> >> >> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> >b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> >> index 7734f70e1057..dc1bf8c1afb5 100644
> >> >> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> >> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >> >> @@ -704,6 +704,13 @@
> >> >>  			status = "disabled";
> >> >>  		};
> >> >>
> >> >> +		lradc: lradc@...1800 {
> >> >> +			compatible = "allwinner,sun4i-a10-lradc-keys";
> >> >> +			reg = <0x01c21800 0x100>;
> >> >> +			interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
> >> >> +			status = "disabled";
> >> >> +		};
> >> >> +
> >> >
> >> >The controller is pretty different on the A64 compared to the A10.
> >The
> >> >A10 has two channels for example, while the A64 has only one.
> >> >
> >> >It looks like the one in the A83t though, so you can use that
> >> >compatible instead.
> >>
> >> Looking at the patch for the A83t, the only difference is that it
> >> uses a 3/4 instead of a 2/3 voltage divider, nothing is changed with
> >> the channels.
> >
> >I guess you can reuse the A83t compatible here then, and a more
> >specific a64 compatible in case we ever need to fix this.
> >
> >> But I'm also not sure which one (or a different one)
> >> is used from looking at the "A64 User Manual".
> >
> >I'm sorry, what are you referring to with "one" in that sentence?
>
> Sorry, I meant I didn't find anything in the A64 user manual whether
> a 3/4 or a 2/3 voltage divider (or one with different values) is
> used on the A64.

Ok :)

I guess you can just reuse the A83t compatible then, together with the
A64's.

Maxime

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

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