linux-kernel - Re: [PATCH v2 2/5] thermal: of: implement .set

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Message-ID: <20160524130139.GB8979@e104805>
Date:	Tue, 24 May 2016 14:01:39 +0100
From:	Javi Merino <javi.merino@....com>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	edubezval@...il.com, Heiko Stuebner <heiko@...ech.de>,
	dianders@...omium.org, briannorris@...gle.com, smbarber@...gle.com,
	linux-rockchip@...ts.infradead.org, cf@...k-chips.com,
	huangtao@...k-chips.com, dmitry.torokhov@...il.com,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] thermal: of: implement .set_trips for device tree
 thermal zones

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.

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
>