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

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Date:	Mon, 8 Jul 2013 09:50:24 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Wei Ni <wni@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	Matthew Longnecker <MLongnecker@...dia.com>,
	Alex Courbot <acourbot@...dia.com>,
	linux-tegra@...r.kernel.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, 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.

-- 
Jean Delvare
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