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

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Message-ID: <CAAST=9zv8nqbR42kS99F5S6Nk6brZXE8ruOEapSf7sEjKBrD-A@mail.gmail.com>
Date:   Thu, 29 Jun 2017 20:19:14 +0800
From:   Ziping Chen <techping.chan@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     icenowy@...c.io, 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,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [linux-sunxi] Re: [PATCH v3 2/3] dt-bindings: input: Add R_LRADC
 support for A83T

2017-06-29 15:53 GMT+08:00 Maxime Ripard <maxime.ripard@...e-electrons.com>:
> On Thu, Jun 29, 2017 at 12:45:51PM +0800, Ziping Chen wrote:
>> 2017-06-28 1:36 GMT+08:00 Maxime Ripard <maxime.ripard@...e-electrons.com>:
>> > Hi,
>> >
>> > On Tue, Jun 27, 2017 at 11:29:10PM +0800, icenowy@...c.io wrote:
>> >> Maxime, here's another problem: if we have already a GP LRADC driver,
>> >> how can we tell the kernel to use it as IIO ADC rather than keys?
>> >
>> > The GPADC IIO driver is not for the LRADC driver, but the GPADC /
>> > temperature sensor.
>> >
>> > We used to have an LRADC IIO driver in the CHIP BSP written by Alex
>> > (in CC):
>> > https://github.com/NextThingCo/CHIP-linux/commit/8675b761c54be73dc7cc0113209f02e10cc63a27
>> >
>> > But he never mainlined it.
>> >
>> >> Should we introduce a new property for this once ready?
>> >
>> > We need to keep the current binding. We can just check for the
>> > presence or not of child nodes to see if it has some keys, and we'd
>> > need an IIO-to-input driver that is yet to be written.
>> >
>>
>> Yes, then we need an iio-to-input driver...
>> So...whether the driver(a83t lradc keys) can be applied now,
>> or we should wait for the iio-to-input driver.
>
> This is a long term discussion, it shouldn't hold the patches you
> sent.

OK, I get it.

And I will think about how to implement the iio-to-input driver.

Thanks,
Ziping

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