linux-kernel - Re: [PATCH 3/3] hwmon: (cros_ec) register fans into thermal framework cooling devices

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Message-ID: <4x3ouuawdtee3cbj7wwad5aazgfsjo2vbzsib5oxbmjcmny4re@kiseb26pciyj>
Date: Fri, 2 May 2025 13:35:30 +0800
From: Sung-Chi Li <lschyi@...omium.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Thomas Weißschuh <linux@...ssschuh.net>, 
	Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>, 
	Jean Delvare <jdelvare@...e.com>, Jonathan Corbet <corbet@....net>, 
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org, 
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 3/3] hwmon: (cros_ec) register fans into thermal
 framework cooling devices

On Wed, Apr 30, 2025 at 08:38:06AM -0700, Guenter Roeck wrote:
> On 4/30/25 07:36, Thomas Weißschuh wrote:
> > On 2025-04-30 09:51:03+0800, Sung-Chi Li wrote:
> > > On Tue, Apr 29, 2025 at 10:45:56PM +0200, Thomas Weißschuh wrote:
> > > > On 2025-04-29 16:14:23+0800, Sung-Chi Li via B4 Relay wrote:
> > > > > From: Sung-Chi Li <lschyi@...omium.org>
> > > > > 
> > > > > Register fans connected under EC as thermal cooling devices as well, so
> > > > > these fans can then work with the thermal framework.
> > > > > 
> > > > > During the driver probing phase, we will also try to register each fan
> > > > > as a thermal cooling device based on previous probe result (whether the
> > > > > there are fans connected on that channel, and whether EC supports fan
> > > > > control). The basic get max state, get current state, and set current
> > > > > state methods are then implemented as well.
> > > > 
> > > > There is also HWMON_C_REGISTER_TZ, however it depends on OF.
> > > > But this patch looks very generic, so maybe it makes sense to implement
> > > > it in the hwmon core.
> > > > 
> > > 
> > > Hi, the HWMON_C_REGISTER_TZ is for registering a thermal sensor, and here I
> > > registered it as thermal cooling devices, so they are different. I followed
> > > other hwmon drivers:
> > > 
> > >    - gpio-fan.c
> > >    - aspeed-pwm-tacho.c
> > >    - max6650.c
> > >    - qnap-mcu-hwmon.c
> > >    - ...
> > 
> > Indeed, sorry.
> > 
> > > . These hwmon drivers also manually registered other cooling devices, and that
> > > makes sense to me, so I think it is good to just register cooling devices rather
> > > than make big changes to hwmon core.
> > 
> > The implementation does look like a lot of boilerplate.
> > If Guenter doesn't chime in, let's stick with the current approach.
> > 
> 
> Someone could make the necessary improvements to the hwmon core and clean up the drivers
> implementing that boilerplate today, but that should be a separate patch series, and this
> series should not depend on it.
> 
> Patches welcome ...
> 
> Thanks,
> Guenter
> 

Thank you, I will first complete this series, and see how to improve hwmon core
afterwards.