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

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Message-ID: <9B2B83DF-2C91-4DDA-B707-664A792A8BCF@z3ntu.xyz>
Date:   Tue, 21 May 2019 08:43:45 +0200
From:   luca@...tu.xyz
To:     Maxime Ripard <maxime.ripard@...tlin.com>
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 May 20, 2019 1:07:42 PM GMT+02:00, Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>Hi!
>
>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.
>
>Maxime
>
>--
>Maxime Ripard, Bootlin
>Embedded Linux and Kernel engineering
>https://bootlin.com

Hi,
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. But I'm also not sure which one (or a different one) is used from looking at the "A64 User Manual".

Thanks, Luca