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

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Message-ID: <51DBC058.2040904@nvidia.com>
Date:	Tue, 9 Jul 2013 15:48:40 +0800
From:	Wei Ni <wni@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Guenter Roeck <linux@...ck-us.net>,
	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 07/09/2013 02:21 PM, Thierry Reding wrote:
> * PGP Signed by an unknown key
> 
> 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.

I synced the linux-next from:
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
and use the tag v3.10-rc7, but in the lm90.c it doesn't have DT support,
such as "onnn,nct1008".
I googled it and found there has patch:
[PATCH] hwmon: (lm90) Add device tree support , which is in:
http://lists.lm-sensors.org/pipermail/lm-sensors/2013-February/038099.html
, but it didn't be merged into the linux-next.

which git repository and branch should I use ?

Thanks.
Wei.

> 
> Thierry
> 
> * Unknown Key
> * 0x7F3EB3A1
> 

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