linux-kernel - Re: [PATCH] hwmon: add support for GMT G751 chip in lm75 driver

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Date:	Sat, 09 Nov 2013 20:42:05 +0100
From:	arno@...isbad.org (Arnaud Ebalard)
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	lm-sensors@...sensors.org
Subject: Re: [PATCH] hwmon: add support for GMT G751 chip in lm75 driver

Hi Guenter,

Guenter Roeck <linux@...ck-us.net> writes:

> On Sat, Nov 09, 2013 at 06:39:14PM +0100, Arnaud Ebalard wrote:
>> 
>> This was tested on a NETGEAR ReadyNAS 2120 device (Marvell Armada XP
>> based board, via DT).
>> 
>> Signed-off-by: Arnaud Ebalard <arno@...isbad.org>
>
> Looks good. I'll apply it to my -next branch. Since I already sent my 
> pull request to Linus, this will only go in after -rc1, which I hope
> should be ok (unless Jean wants to pick it up for his pull request).

Perfect, thanks.


>> ---
>> Hi Guenter,
>> 
>> As a side note, I removed the hunk that was present in previous patch to
>> add gmt to the list of DT vendor prefixes because I noticed someone had
>> taken care: https://lkml.org/lkml/2013/9/12/365
>> 
>> For the records, here is what I get on my NAS with the attached patch:
>> 
>> root@...n:/sys# sensors
>> g762-i2c-0-3e
>> Adapter: mv64xxx_i2c adapter
>> fan1:        5461 RPM  (div = 1)
>> 
>> g762-i2c-0-48
>> Adapter: mv64xxx_i2c adapter
>> fan1:        5461 RPM  (div = 1)
>> 
>> g762-i2c-0-49
>> Adapter: mv64xxx_i2c adapter
>> fan1:        5461 RPM  (div = 1)
>> 
> Those rpms are pretty high. Are the fans all really running that fast ?

Unlike the fans on NETGEAR ReadyNAS 102 and 104 which are Protechnic
MGT9212YB-025 92mmx92mm running at 3200 RPM max, the three fans in the
RN2120 are Protechnic MGT4012XB-O20, i.e. 40mmx40mm running at 8000 RPM
max. At least, this is the max RPM value I found on their website
(Search Products on left side of http://www.protechnic-us.com/en/) for
both devices.

When pushing one a bit, here is the max rotation speed I get:

 root@...n:/sys/bus/i2c/drivers/g762/0-003e# echo 9000 > fan1_target ; \
                                             sleep 5 ; cat fan1_input
 8057

which AFAICT validates current settings for G762 and fan combination.
Did I miss something?

Cheers,

a+
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