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

Amit Kachhap amit.kachhap at linaro.org
Mon Mar 5 09:11:14 UTC 2012

On 3 March 2012 23:34, Guenter Roeck <guenter.roeck at ericsson.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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