linux-kernel - Re: [PATCH 2/3] hwmon: Driver for OMAP3 temperature sensor

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Date:	Sun, 18 Jan 2015 14:18:24 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Pavel Machek <pavel@....cz>
CC:	Nishanth Menon <nm@...com>, Grazvydas Ignotas <notasas@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	dt list <devicetree@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org, Rob Herring <robh+dt@...nel.org>,
	Jean Delvare <jdelvare@...e.de>,
	Benoît Cousson <bcousson@...libre.com>,
	Pali Rohar <pali.rohar@...il.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] hwmon: Driver for OMAP3 temperature sensor

On 01/18/2015 12:33 PM, Pavel Machek wrote:

>>>> Pavel,
>>>>
>>>> can you look into the omap4 thermal driver to see if it can be used ?
>>>
>>> After some fixes... yes, it seems to be same hardware.
>>>
>> So this should be the way to go, but then we have others claim that
>> it should not be done because the OMAP3 sensors are too unreliable
>> to use for thermal decisions. Not really sure where that leaves us.
>> I am kind of opposed to have similar drivers for similar chips
>> in two different subsystems.
>>
>> Is it possible to add the patch below to the omap thermal driver
>> and not use it for thermal decisions ?
>
> Well... noone forces you to enable the driver, and I don't think it
> will do any thermal decisions on N900 as it is ... so we should be ok.
>
> Plus, it seems to work reasonably well (say +- 5 C), so situation does
> not seem to be as bad as TI claims.
>
> Nokia was actually using it in production.
>
Ok, I'll assume that omap3 support will be added to the omap thermal driver.

Thanks,
Guenter

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