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From: Guenter Roeck <linux@roeck-us.net>
To: Jean Delvare <jdelvare@suse.de>
Cc: Andreas Werner <andreas.werner@men.de>,
	wni@nvidia.com, lm-sensors@lm-sensors.org,
	linux-kernel@vger.kernel.org
Subject: Re: [lm-sensors] LM90 driver and ti tmp461 detection
Date: Thu, 17 Dec 2015 14:57:51 +0000	[thread overview]
Message-ID: <20151217145751.GA21030@roeck-us.net> (raw)
In-Reply-To: <20151217124808.63f8f54f@endymion.delvare>

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.
> 
Excellent idea!

Guenter

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WARNING: multiple messages have this Message-ID (diff)
From: Guenter Roeck <linux@roeck-us.net>
To: Jean Delvare <jdelvare@suse.de>
Cc: Andreas Werner <andreas.werner@men.de>,
	wni@nvidia.com, lm-sensors@lm-sensors.org,
	linux-kernel@vger.kernel.org
Subject: Re: [lm-sensors] LM90 driver and ti tmp461 detection
Date: Thu, 17 Dec 2015 06:57:51 -0800	[thread overview]
Message-ID: <20151217145751.GA21030@roeck-us.net> (raw)
In-Reply-To: <20151217124808.63f8f54f@endymion.delvare>

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.
> 
Excellent idea!

Guenter

  parent reply	other threads:[~2015-12-17 14:57 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-10 12:08 [lm-sensors] LM90 driver and ti tmp461 detection Andreas Werner
2015-12-10 12:08 ` Andreas Werner
2015-12-10 16:41 ` Guenter Roeck
2015-12-10 17:12   ` [lm-sensors] " Andreas Werner
2015-12-10 17:12     ` Andreas Werner
2015-12-10 17:43     ` Guenter Roeck
2015-12-10 18:03       ` [lm-sensors] " Andreas Werner
2015-12-10 18:03         ` Andreas Werner
2015-12-10 17:49     ` Guenter Roeck
2015-12-10 18:09       ` [lm-sensors] " Andreas Werner
2015-12-10 18:09         ` Andreas Werner
2015-12-12 10:08     ` [lm-sensors] " Jean Delvare
2015-12-12 10:08       ` Jean Delvare
2015-12-15 15:11       ` Andreas Werner
2015-12-15 15:11         ` Andreas Werner
2015-12-17 11:48         ` Jean Delvare
2015-12-17 11:48           ` Jean Delvare
2015-12-17 11:54           ` Andreas Werner
2015-12-17 11:54             ` Andreas Werner
2015-12-17 14:57           ` Guenter Roeck [this message]
2015-12-17 14:57             ` Guenter Roeck
2015-12-18  8:18             ` Andreas Werner
2015-12-18  8:18               ` Andreas Werner
2015-12-12 11:42 ` Andreas Werner
2015-12-12 11:42   ` Andreas Werner

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