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

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Date:	Wed, 17 Jul 2013 11:23:54 +0300
From:	Mikko Perttunen <mperttunen@...dia.com>
To:	Wei Ni <wni@...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 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.

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