linux-kernel - Re: [PATCH v3] thermal: Add QPNP PMIC temperature alarm driver

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Date:	Thu, 30 Oct 2014 15:55:45 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	David Collins <collinsd@...eaurora.org>
Subject: Re: [PATCH v3] thermal: Add QPNP PMIC temperature alarm driver


On Wed, 2014-10-29 at 17:32 +0200, Ivan T. Ivanov wrote:
> 
+
> > > +       chip->tz_dev = thermal_zone_device_register(node->name, TRIP_NUM, 0,
> > > +       chip, &qpnp_tz_ops, NULL,
> > 
> > Have you considered using of-thermal instead of doing your own specific thermal
> > zone registration? Having a glance look in this driver, most of the
> > operation are covered by of-thermal. Ahy concerns using of-thermal in
> > your case?
> > 
> 
> I just followed implementation found in "armada_thermal", "db8500-thermal",
> "dove_thermal", "imx_thermal", "kirkwood_thermal"...
> 
> Will look at of-thermal.
> 

Hm, the 15 drivers, which register its own thermal zone, against 4, which 
use of-thermal registration and one of them is OMAP, which have fallback
to its own zone registration :-). Anyway. I am afraid that if I use just
thermal_zone_of_sensor_register(), driver will lost ability to switch off 
hardware controlled shutdown sequence, which make it useless IMHO.

I don't see how driver can benefits from nice things provided by of-thermal.
There is no colling device associated with PMIC chip, pooling delays are of
no use, device uses interrupt, trip pints are predefined in hardware...

Please advice.

Regards,
Ivan
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