linux-kernel - Re: [PATCH v2 2/5] thermal: of: implement .set_trips for device tree thermal zones

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Date:	Wed, 25 May 2016 11:28:58 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Javi Merino <javi.merino@....com>
CC:	Caesar Wang <wxt@...k-chips.com>, huangtao@...k-chips.com,
	Heiko Stuebner <heiko@...ech.de>, linux-pm@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	dmitry.torokhov@...il.com, dianders@...omium.org,
	linux-kernel@...r.kernel.org, edubezval@...il.com,
	linux-rockchip@...ts.infradead.org, smbarber@...gle.com,
	cf@...k-chips.com, briannorris@...gle.com,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v2 2/5] thermal: of: implement .set_trips for device tree
 thermal zones

Hi Javi,

On 2016年05月24日 21:01, Javi Merino wrote:
> On Tue, May 03, 2016 at 05:33:30PM +0800, Caesar Wang wrote:
>> From: Sascha Hauer <s.hauer@...gutronix.de>
>>
>> This patch implemnets .set_trips for device tree thermal zones.
>> As the hardware-tracked trip points is supported by thermal core patch[0].
>>
>> patch[0]
>> "thermal: Add support for hardware-tracked trip points".
>>
>> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
>> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
>> Cc: Zhang Rui <rui.zhang@...el.com>
>> Cc: Eduardo Valentin <edubezval@...il.com>
>> Cc: linux-pm@...r.kernel.org
>>
>> ---
>>
>> Changes in v2:
>> - add the commit in patch[v2 2/5].
>>
>>   drivers/thermal/of-thermal.c | 12 ++++++++++++
>>   include/linux/thermal.h      |  4 ++++
>>   2 files changed, 16 insertions(+)
>>
>> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
>> index b8e509c..8722e63 100644
>> --- a/drivers/thermal/of-thermal.c
>> +++ b/drivers/thermal/of-thermal.c
>> @@ -101,6 +101,17 @@ static int of_thermal_get_temp(struct thermal_zone_device *tz,
>>   	return data->ops->get_temp(data->sensor_data, temp);
>>   }
>>   
>> +static int of_thermal_set_trips(struct thermal_zone_device *tz,
>> +				int low, int high)
>> +{
>> +	struct __thermal_zone *data = tz->devdata;
>> +
>> +	if (!data->ops || !data->ops->set_trips)
>> +		return -EINVAL;
>> +
>> +	return data->ops->set_trips(data->sensor_data, low, high);
>> +}
>> +
>>   /**
>>    * of_thermal_get_ntrips - function to export number of available trip
>>    *			   points.
>> @@ -427,6 +438,7 @@ thermal_zone_of_add_sensor(struct device_node *zone,
>>   
>>   	tzd->ops->get_temp = of_thermal_get_temp;
>>   	tzd->ops->get_trend = of_thermal_get_trend;
>> +	tzd->ops->set_trips = of_thermal_set_trips;
> Why not do it only if ops->set_trips is set?  Something like
>
> 	if (ops->set_trips)
> 		tzd->ops->set_trips = of_thermal_set_trips;
>
> Otherwise, the thermal zone core will calculate the window for all
> device tree thermal zones, even if they haven't set the optional
> set_trips pointer.

Hmm, agree it in here.
fixes in next version.

> Cheers,
> Javi
>
>>   	tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
>>   	mutex_unlock(&tzd->lock);
>>   
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index e258359..09053eb 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -336,12 +336,16 @@ struct thermal_genl_event {
>>    *
>>    * Optional:
>>    * @get_trend: a pointer to a function that reads the sensor temperature trend.
>> + * @set_trips: a pointer to a function that sets a temperature window. When
>> + *	       this window is left the driver must inform the thermal core via
>> + *	       thermal_zone_device_update.
>>    * @set_emul_temp: a pointer to a function that sets sensor emulated
>>    *		   temperature.
>>    */
>>   struct thermal_zone_of_device_ops {
>>   	int (*get_temp)(void *, int *);
>>   	int (*get_trend)(void *, long *);
>> +	int (*set_trips)(void *, int, int);
>>   	int (*set_emul_temp)(void *, int);
>>   	int (*set_trip_temp)(void *, int, int);
>>   };
>> -- 
>> 1.9.1
>>
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