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

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Date:	Thu, 11 Sep 2014 14:32:08 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Eduardo Valentin <edubezval@...il.com>
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

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.

	Arnd
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