linux-kernel - Re: [PATCH v2] hwmon: ntc: Add DT with IIO support to NTC thermistor driver

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Message-ID: <CAD=FV=Wn5=XVUNXia1=9oEXA89gVPkjP7+itewXjXa19r-o6ZA@mail.gmail.com>
Date:	Tue, 12 Mar 2013 16:26:42 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org, devicetree-discuss@...ts.ozlabs.org,
	Jean Delvare <khali@...ux-fr.org>,
	Naveen Krishna <naveenkrishna.ch@...il.com>
Subject: Re: [PATCH v2] hwmon: ntc: Add DT with IIO support to NTC thermistor driver

Hi,

On Tue, Mar 12, 2013 at 6:45 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Tue, Mar 12, 2013 at 02:09:26PM +0530, Naveen Krishna Chatradhi wrote:
>> This patch adds DT support to NTC driver to parse the
>> platform data.
>>
>> Also adds the support to work as an iio device.
>>
>> During the probe ntc driver gets the respective channels of ADC
>> and uses iio_raw_read calls to get the ADC converted value.
>>
>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>

I know that there is still work to do to address Guenter's comments,
but I spent a little time playing with this today to see what else was
missing and actually got it working.  :)  I'll add a "Tested-by" once
Naveen reposts.

I sent up my patches that I needed to the ADC + device trees to get it
working, but I just realized that I forgot to CC Guenter.  Doh!  In
case you're curious, you can find them at:
* https://patchwork.kernel.org/patch/2260231/
* https://patchwork.kernel.org/patch/2260211/
* https://patchwork.kernel.org/patch/2260221/
* https://patchwork.kernel.org/patch/2260201/

> You'll still need the conditional dependency on IIO in Kconfig.
> Something like
>         depends on IIO if OF
> if that works, or alternatively
>         select IIO if OF
> if that is acceptable.

This was important for me.  I had IIO setup as a module and adc
configured an in-kernel.  Without the above I got a nice linker error.
 ;)
The syntax that worked for me was 'select IIO if OF'.  I don't think
you can do a conditional depends on (it didn't work for me and I
couldn't find any examples like that).

>> +Read more about iio bindings at
>> +     Documentation/devicetree/bindings/iio/iio-bindings.txt
>> +

BTW: the above line had a whitespace error on it.  Double-check that
it's gone for the next version.

-Doug
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