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

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Message-ID: <20170627173631.2rjdzgwdwnksqjzm@flea>
Date:   Tue, 27 Jun 2017 19:36:31 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     icenowy@...c.io
Cc:     techping.chan@...il.com, 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

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.

Maxime

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

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