linux-kernel - Re: [PATCH v3 0/2] Enable lm90 in Tegra30 and Tegra114.

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Message-ID: <51E65EFC.9000204@nvidia.com>
Date:	Wed, 17 Jul 2013 17:08:12 +0800
From:	Wei Ni <wni@...dia.com>
To:	Mikko Perttunen <mperttunen@...dia.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 0/2] Enable lm90 in Tegra30 and Tegra114.

On 07/17/2013 04:23 PM, Mikko Perttunen wrote:
> On 07/17/2013 11:17 AM, Wei Ni wrote:
>> On 07/16/2013 07:14 PM, Wei Ni wrote:
>>> On 07/16/2013 01:13 AM, Stephen Warren wrote:
>>>> On 07/15/2013 10:48 AM, Stephen Warren wrote:
>>>>> On 07/12/2013 01:49 AM, Wei Ni wrote:
>>>>>> Enable thermal sensor lm90 for Tegra30 Cardhu and Tegra114 Dalmore.
>>>>>
>>>>> I have applied the series to Tegra's for-3.12/dt branch.
>>>>
>>>> Actually, I see the following on Dalmore (although Cardhu works):
>>>>
>>>> [   29.448539] lm90 0-004c: Register 0x4 read failed (-121)
>>>> [   29.453930] lm90 0-004c: Failed to read convrate register!
>>>> [   29.460034] lm90 0-004c: Register 0x3 read failed (-121)
>>>> [   29.465408] lm90 0-004c: Initialization failed!
>>>>
>>>> So, there's something wrong here, and I've dropped the patch for
>>>> Dalmore. Does this patch actually work for you?
>>>>
>>> I test it with the Chrome u-boot, the lm90 works fine.
>>> But today, if I tried to use the uboot from
>>> git://git.denx.de/u-boot-tegra.git, I can repo your errors, it seems the
>>> i2c can't work, the lm90 driver read register failed.
>>> I traced it, but can't find the root cause yet.
>>
>> Hi, Stephen
>> I found the root cause.
>> In the Chrome u-boot, it will turn on the regulator for the lm90, but in
>> the upstream u-boot, it didn't do it.
>> I think this regulator should be handled in the kernel driver, but it
>> seems the regulator palmas tps65913 didn't be supported on the dalmore yet.
>> So may be we have to wait the palmas ready on dalmore.
> 
> A patch to enable tps65913 on dalmore has already been posted a couple 
> of days
> ago by Laxman Dewangan, so this shouldn't be too problematic.

Oh, great, I will look it.

> 
>>
>> Do you have any suggestions?
>>
>> Thanks.
>> Wei.
>>
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