linux-kernel - Re: [lm-sensors] [PATCH 1/2] ARM: dt: t30 cardhu: add dt entry for lm90

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Date:	Tue, 9 Jul 2013 08:21:14 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Wei Ni <wni@...dia.com>, Jean Delvare <khali@...ux-fr.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	Alex Courbot <acourbot@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [lm-sensors] [PATCH 1/2] ARM: dt: t30 cardhu: add dt entry for
 lm90

On Mon, Jul 08, 2013 at 06:14:21AM -0700, Guenter Roeck wrote:
> On Mon, Jul 08, 2013 at 05:36:05PM +0800, Wei Ni wrote:
> > On 07/08/2013 03:50 PM, Jean Delvare wrote:
> > > On Mon, 8 Jul 2013 15:35:48 +0800, Wei Ni wrote:
> > >> On 07/06/2013 01:38 AM, Stephen Warren wrote:
> > >>> On 07/04/2013 03:09 AM, Wei Ni wrote:
> > >>>> Enable thermal sensor lm90 for t30 cardhu.
> > >>>
> > >>>> diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
> > >>>
> > >>>> +		nct1008: nct1008 {
> > >>>> +			compatible = "lm90,nct1008";
> > >>>
> > >>> "lm90" isn't a valid vendor prefix. I believe the value you want is
> > >>> "onnn,nct1008". Same comment for patch 2/2.
> > >>
> > >> The lm90 doesn't support device tree very well.
> > > 
> > > I doubt it, but if this is the case, then please fix it, instead of
> > > working the problem around in a different place.
> > > 
> > >> In the DT, we need to
> > >> named as "lm90" so that the lm90 driver can be loaded,
> > > 
> > > Not that I am an expert with regards to DT, but this doesn't make any
> > > sense to me. AFAIK DT is about devices, not which drivers handle them.
> > > 
> > >> and we also need
> > >> to add "nct1008" to indicate this is the nct1008 device, so that the
> > >> lm90 driver can be loaded with the right i2c_device_id->driver_data.
> > >>
> > >> I set the " compatible = "lm90,nct1008" ", this is the simplest way, and
> > >> we doesn't need to change the lm90.c.
> > > 
> > > There's no problem with changing the lm90 driver, if this is the right
> > > thing to do.
> > 
> > Ok, I will add DT support in the lm90.c in my next version patch.
> > 
> Only if you can show that it is necessary.

It should work out of the box. As a matter of fact the same chip is used
on Tamonten and the DTS files use "onnn,nct1008". That used to work. If
it no longer does then that's a regression.

Thierry

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