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

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Date:	Tue, 16 Jul 2013 19:14:48 +0800
From:	Wei Ni <wni@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"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 07/16/2013 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.
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