linux-kernel - Re: [PATCH 0/3] hwmon: add Microchip EMC230X fan controller driver

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Message-Id: <7c1c705f-65b4-47d3-afae-68e70b85ab3b@www.fastmail.com>
Date:   Wed, 14 Sep 2022 20:24:12 +1000
From:   "Mathew McBride" <matt@...verse.com.au>
To:     "Guenter Roeck" <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] hwmon: add Microchip EMC230X fan controller driver

On Wed, Sep 14, 2022, at 8:12 PM, Guenter Roeck wrote:
> On Wed, Sep 14, 2022 at 05:30:27AM +0000, Mathew McBride wrote:
> > The Microchip EMC230X (formerly made by SMSC) family of fan controllers
> > provide PWM control for up to 5 fans (in the EMC2305). The EMC230X is
> > capable of maintaining (closed-loop) a target RPM speed through PWM.
> > 
> > This driver has been tested with the EMC2301 (on our Traverse Ten64
> > appliance) and with the EMC2305 demo board (ADM00879).
> > 
> > The driver is by no means complete, for example, further work would
> > be required to support the different PWM output frequencies for
> > voltage-based fan speed control. (So far this driver has only been
> > tested with direct PWM capable fans, like the 4 pin fans found
> > in recent PCs)
> > 
> > The emc230x driver also has thermal subsystem integration which allows
> > the emc230x-controlled fan(s) to be used as cooling devices.
> 
> I just accepted a driver or emc2301/2/3/5. Please submit improvements
> on top of that driver if needed; we won't have competing drivers
> for the same chip in the kernel, and replacing a just accepted driver
> smply does not make any sense.

My apologies, I was unaware of the separate effort! 
Mine has been out of tree for a long time and I finally had time to work on it recently.

There are several changes I can see that need to be made to the accepted one to work for our usecase.

> Guenter
>