linux-kernel - Re: [lm-sensors] [linux-pm] [PATCH 2/4] hwmon: exynos4: Move thermal sensor driver to driver/mfd directory

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Date:	Mon, 5 Mar 2012 14:41:14 +0530
From:	Amit Kachhap <amit.kachhap@...aro.org>
To:	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [lm-sensors] [linux-pm] [PATCH 2/4] hwmon: exynos4: Move thermal
 sensor driver to driver/mfd directory

On 3 March 2012 23:34, Guenter Roeck <guenter.roeck@...csson.com> wrote:
> On Sat, Mar 03, 2012 at 11:44:10AM -0500, Mark Brown wrote:
>> On Sat, Mar 03, 2012 at 04:36:05PM +0530, Amit Daniel Kachhap wrote:
>> > This movement is needed because the hwmon entries and corresponding
>> > sysfs interface is a duplicate of utilities already provided by
>> > driver/thermal/thermal_sys.c. The goal is to place it in mfd folder
>> > and add necessary calls to get the temperature information.
>>
>> > --- a/Documentation/hwmon/exynos4_tmu
>> > +++ /dev/null
>>
>> Moving this seems to be a failure, the device is exposing a hwmon
>> interface even if you've moved the code to mfd (though it doesn't
>> actually look like a multi-function device at all as far as I can see -
>> usually a MFD would have a bunch of unrelated functionality while this
>> has one function used by two subsystems).
>>
>> If anything it looks like the ADC driver ought to be moved into IIO with
>> either generic or Exynos specific function drivers layered on top of it
>> in hwmon and thermal making use of the values that are read.
>>
> I would agree. Or maybe move it all to thermal, since thermal devices register
> the hwmon subsystem.

Ok I agree with your suggestion of moving into thermal. Since I wanted
to separate exynos specific generic thermal implementation with the
H/W driver so that other versions of the sensor driver can easily hook
into the common part. Anyway this implementation seems possible.

Thanks for the comments
>
> Guenter
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