linux-kernel - Re: [lm-sensors] LM90 driver and ti tmp461 detection

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Message-ID: <20151217115420.GB2349@awelinux>
Date:	Thu, 17 Dec 2015 12:54:20 +0100
From:	Andreas Werner <andreas.werner@....de>
To:	Jean Delvare <jdelvare@...e.de>
CC:	Andreas Werner <andreas.werner@....de>,
	Guenter Roeck <linux@...ck-us.net>, <wni@...dia.com>,
	<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [lm-sensors] LM90 driver and ti tmp461 detection

On Thu, Dec 17, 2015 at 12:48:08PM +0100, Jean Delvare wrote:
> Hi Andreas,
> 
> On Tue, 15 Dec 2015 16:11:24 +0100, Andreas Werner wrote:
> > here is the register dump of the tmp461.
> 
> Thanks.
> 
> > It seemse that we really cannot detect if it is a tmp461 or a tmp451.
> > Also the magic "ID Register" offset 0xff is 0x00 for both devices.
> 
> I would use register 0x16, which doesn't exist but reads 0x00 on the
> TMP451. It could in theory also read 0x00 on the TMP461 but only if
> both channels are disabled, which makes little sense. More likely at
> least one channel will be enabled so you'll have value 0x01-0x03 if
> this is a TMP461.
>

Yes you are right. Both channels are enabled during POR, so the chance
to have a 0x00 as in the TMP451 will be very low.
 
> -- 
> Jean Delvare
> SUSE L3 Support
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