linux-kernel - Re: [PATCH v3] hwmon: Add support for MAX31785 intelligent fan controller

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Date:   Thu, 08 Jun 2017 17:23:13 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, jdelvare@...e.com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        joel@....id.au, msbarth@...ux.vnet.ibm.com,
        tpearson@...torengineering.com, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v3] hwmon: Add support for MAX31785 intelligent fan
 controller

On Wed, 2017-06-07 at 08:55 -0700, Guenter Roeck wrote:
> On Tue, Jun 06, 2017 at 04:32:30PM +0930, Andrew Jeffery wrote:
> > Add a basic driver for the MAX31785, focusing on the fan control
> > features but ignoring the temperature and voltage monitoring
> > features of the device.
> > 
> > This driver supports all fan control modes and tachometer / PWM
> > readback where applicable.
> > 
> > > > Signed-off-by: Timothy Pearson <tpearson@...torengineering.com>
> > > > Signed-off-by: Andrew Jeffery <andrew@...id.au>
> > ---
> > Hello,
> > 
> > This is a rework of Timothy Pearson's original patch:
> > 
> >     https://www.mail-archive.com/linux-hwmon@vger.kernel.org/msg00868.html
> > 
> > I've labelled it as v3 to differentiate from Timothy's postings.
> > 
> > The original thread had some discussion about the MAX31785 being a PMBus device
> > and that it should thus be a PMBus driver. The implementation still makes use
> 
> After thinking about it, that is what it should be. If I accept it as non-PMBus
> driver, it will be all but impossible to convert it to a PMBus driver later on,
> and that just doesn't make any sense.

Hopefully not being too ignorant here, but can you expand on why it
would be all but impossible to convert?

> 
> With no one interested in writing that driver, I'll try to give it some more
> priority myself. I do have an evaluation board somewhere, which should help.
> 
> Note that the second fan reading should be implemented as just that, not with
> a non-standard attribute.

Agreed.

Andrew
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