linux-kernel - Re: [PATCH v4 2/4] dt-bindings: document Rockchip thermal

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Message-ID: <20140911155324.GA27076@developer>
Date:	Thu, 11 Sep 2014 11:53:27 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Heiko Stübner <heiko@...ech.de>,
	Caesar Wang <caesar.wang@...k-chips.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Tao Huang <huangtao@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>,
	Douglas Anderson <dianders@...omium.org>,
	dtor <dtor@...omium.org>, Chris Zhong <zyw@...k-chips.com>,
	"addy.ke@...k-chips.com" <addy.ke@...k-chips.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	zhaoyifeng <zyf@...k-chips.com>
Subject: Re: [PATCH v4 2/4] dt-bindings: document Rockchip thermal

Arnd,

On Thu, Sep 11, 2014 at 02:32:08PM +0200, Arnd Bergmann wrote:
> On Thursday 11 September 2014 08:18:43 Eduardo Valentin wrote:
> > > As what we want is to make thermal driver have a chance to configure the
> > > hardware shutdown registers, I'm thinking if we can do this without
> > > representing the hardware shutdown value as a trip point.
> > > Say,
> > > 1. parse DT, and get the hardware shutdown temperature value, and store
> > > it somewhere, e.g. struct __thermal_zone.
> > > 2. introduce a new parameter, int (*set_hardware_trip)(void *, long *),
> > > in thermal_zone_of_sensor_register().
> > > 3. invoke set_hard_trip(tz, hardware_shutdown_temperature_value) in
> > > thermal_zone_of_sensor_register().
> > 
> > The only issue I have with the above proposal is that not all platforms
> > use DT. Some still boot with boardfiles, for instance. Thus, the
> > parameter to configure hardware thermal shutdown needs to be common on
> > thermal core, not specific to of-thermal. Do you agree?
> 
> Do you know of a machine that can't yet be converted to DT and that
> needs this driver? In case of rockchips that is certainly not the
> case, and we don't care about anybody trying to use board files out
> of tree, they can just hack the thermal support as well.

I see. Again, the only concern I have is to produce thermal framework APIs
that would be only in the of-thermal. My point is not specific to this
patch, or this platform, but with a detail in the above proposal. 

While I agree to have a trip specific to configurable hardware triggered
thermal shutdown, I just don't see why it needs to be a feature
implemented only via of-thermal. It has to be properly defined in
thermal core.

The proposal of of-thermal is not to become a separate/competing thermal
framework.

> 
> 	Arnd

Cheers,

Eduardo
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