linux-kernel - Re: [PATCH v3 2/3] dt-bindings: input: Add R

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Date:   Tue, 27 Jun 2017 23:18:17 +0800
From:   Ziping Chen <techping.chan@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh@...nel.org>,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 2/3] dt-bindings: input: Add R_LRADC support for A83T

2017-06-27 1:15 GMT+08:00 Maxime Ripard <maxime.ripard@...e-electrons.com>:
> Hi,
>
> On Sat, Jun 24, 2017 at 10:45:14AM +0800, Ziping Chen wrote:
>> From: Ziping Chen <techping.chan@...il.com>
>>
>> Allwinner A83T SoC has a low res adc like the one
>> in Allwinner A10 SoC.
>>
>> Add binding for it.
>>
>> Signed-off-by: Ziping Chen <techping.chan@...il.com>
>> Acked-by: Rob Herring <robh@...nel.org>
>> ---
>>  Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt b/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
>> index 4357e498ef04..525d85e3043f 100644
>> --- a/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
>> +++ b/Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
>> @@ -2,12 +2,14 @@ Allwinner sun4i low res adc attached tablet keys
>>  ------------------------------------------------
>>
>>  Required properties:
>> - - compatible: "allwinner,sun4i-a10-lradc-keys"
>> + - compatible: should be one of the following string:
>> +             "allwinner,sun4i-a10-lradc-keys"
>> +             "allwinner,sun8i-a83t-r-lradc-keys"
>
> This doesn't really have anything related to keys, and can be used
> purely as an ADC.
>
> I know this is the compatible that was used for the A10, but I'd
> rather drop the keys for the the new compatible.
>

Hi,
LRADC is named KEYADC in some other SoCs' User Manual(such as R40 User
Manual V1.0), thus LRADC is related to keys.

Without keys there is another driver named sun4i-gpadc-iio which is
located at driver/iio/adc/sun4i-gpadc-iio.c

Is my understanding right?

> Thanks!
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com