linux-kernel - Re: [PATCH v6 6/6] hwmon: pwm-fan: Code for using PWM FAN as a cooling device

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Date:	Thu, 26 Feb 2015 15:40:33 +0100
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jean Delvare <jdelvare@...e.de>, Kukjin Kim <kgene@...nel.org>,
	lm-sensors@...sensors.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, devicetree@...r.kernel.org,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>
Subject: Re: [PATCH v6 6/6] hwmon: pwm-fan: Code for using PWM FAN as a cooling
 device

Hi Guenter,

> On 02/26/2015 05:59 AM, Lukasz Majewski wrote:
> > The PWM FAN device can now be used as a thermal cooling device.
> > Necessary infrastructure has been added in this commit.
> >
> > Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> > Acked-by: Eduardo Valentin <edubezval@...il.com>
> > ---
> > Changes for v2:
> > - Replace pwm_fan_cooling_states with pwm_fan_cooling_levels
> > - Update ctx->pwm_fan_state when correct data from device tree is
> > available
> > - Using therma_cdev_update() when thermal is ready for controlling
> > the fan Changes for v3:
> > - Rename patch heading
> > - pwm_fan_of_get_cooling_data() now returns -EINVAL when no
> > "cooling-levels" property defined
> > - register of cooling device only when proper cooling data is
> > present Changes for v4:
> > - None
> > Changes for v5:
> > - Check for IS_ENABLED(CONFIG_THERMAL) has been added to prevent
> > from executing thermal_* specific functions
> > Changes for v6:
> > - Adding missing ctx == NULL check in pwm_fan_get_max_state()
> > - Call to thermal_cooling_device_unregister(ctx->cdev); at
> > pwm_fan_remove()
> > - struct thermal_cooling_device *cdev; added to struct pwm_fan_ctx
> > ---
> >   drivers/hwmon/pwm-fan.c | 89
> > ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed,
> > 88 insertions(+), 1 deletion(-)
> [ ... ]
> >
> > @@ -200,6 +286,7 @@ static int pwm_fan_remove(struct
> > platform_device *pdev) {
> >   	struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
> >
> > +	thermal_cooling_device_unregister(ctx->cdev);
> 
> Unfortunately there is still no prototype for this if CONFIG_THERMAL
> is not configured.

Yes... since Nishanth Menon's changes are now only in
linux-soc-thermal/fixes

> 
> Two options: Yet another revision, or wait a week until the prototypes
> are (hopefully) available and submit a patch without the conditionals.

No problem, I will wait a bit and resend this patch set.

> 
> Guenter
> 

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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