RE: [PATCH V12 2/5] thermal: of-thermal: add API for getting sensor ID from DT

[Anson Huang]

> -----Original Message-----
> From: Daniel Lezcano [mailto:daniel.lezcano@xxxxxxxxxx]
> Sent: Thursday, May 16, 2019 5:39 PM
> To: Anson Huang <anson.huang@xxxxxxx>; robh+dt@xxxxxxxxxx;
> mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; festevam@xxxxxxxxx; catalin.marinas@xxxxxxx;
> will.deacon@xxxxxxx; rui.zhang@xxxxxxxxx; edubezval@xxxxxxxxx;
> Aisheng Dong <aisheng.dong@xxxxxxx>; ulf.hansson@xxxxxxxxxx; Daniel
> Baluta <daniel.baluta@xxxxxxx>; Peng Fan <peng.fan@xxxxxxx>;
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> olof@xxxxxxxxx; bjorn.andersson@xxxxxxxxxx; jagan@xxxxxxxxxxxxxxxxxxxx;
> enric.balletbo@xxxxxxxxxxxxx; marc.w.gonzalez@xxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm-
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> Cc: dl-linux-imx <linux-imx@xxxxxxx>
> Subject: Re: [PATCH V12 2/5] thermal: of-thermal: add API for getting sensor
> ID from DT
> 
> On 16/04/2019 05:22, Anson Huang wrote:
> > On some platforms like i.MX8QXP, the thermal driver needs a real HW
> > sensor ID from DT thermal zone, the HW sensor ID is used to get
> > temperature from SCU firmware, and the virtual sensor ID starting from
> > 0 to N is NOT used at all, this patch adds new API
> > thermal_zone_of_get_sensor_id() to provide the feature of getting
> > sensor ID from DT thermal zone's node.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> 
> Eduardo?
> 
> What do you think about this patch?

I would like to hear Eduardo's opinion about this patch before sending out a new version
for review, thanks.

Anson.

> 
> > ---
> > New patch.
> > ---
> >  drivers/thermal/of-thermal.c | 53
> ++++++++++++++++++++++++++++++++++----------
> >  include/linux/thermal.h      | 10 +++++++++
> >  2 files changed, 51 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/thermal/of-thermal.c
> > b/drivers/thermal/of-thermal.c index 2df059c..2e4320c 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -446,6 +446,46 @@ thermal_zone_of_add_sensor(struct device_node
> > *zone,  }
> >
> >  /**
> > + * thermal_zone_of_get_sensor_id - get sensor ID from a DT thermal
> > + zone
> > + * @tz_np: a valid thermal zone device node.
> > + * @sensor_specs: pointer to output arguments structure will be passed
> back.
> > + * @id: a sensor ID pointer will be passed back.
> > + *
> > + * This function will get sensor ID from a given thermal zone node,
> > + use
> > + * "thermal-sensors" as list name, and get sensor ID from first
> > + phandle's
> > + * argument.
> > + *
> > + * Return: 0 on success, proper error code otherwise.
> > + */
> > +
> > +int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
> > +				  struct of_phandle_args *sensor_specs,
> > +				  u32 *id)
> > +{
> > +	int ret;
> > +
> > +	ret = of_parse_phandle_with_args(tz_np,
> > +					 "thermal-sensors",
> > +					 "#thermal-sensor-cells",
> > +					 0,
> > +					 sensor_specs);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (sensor_specs->args_count >= 1) {
> > +		*id = sensor_specs->args[0];
> > +		WARN(sensor_specs->args_count > 1,
> > +		     "%pOFn: too many cells in sensor specifier %d\n",
> > +		     sensor_specs->np, sensor_specs->args_count);
> > +	} else {
> > +		*id = 0;
> > +	}
> > +
> > +	return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(thermal_zone_of_get_sensor_id);
> > +
> > +/**
> >   * thermal_zone_of_sensor_register - registers a sensor to a DT thermal
> zone
> >   * @dev: a valid struct device pointer of a sensor device. Must contain
> >   *       a valid .of_node, for the sensor node.
> > @@ -500,21 +540,10 @@ thermal_zone_of_sensor_register(struct device
> *dev, int sensor_id, void *data,
> >  		int ret, id;
> >
> >  		/* For now, thermal framework supports only 1 sensor per
> zone */
> > -		ret = of_parse_phandle_with_args(child, "thermal-sensors",
> > -						 "#thermal-sensor-cells",
> > -						 0, &sensor_specs);
> > +		ret = thermal_zone_of_get_sensor_id(child, &sensor_specs,
> &id);
> >  		if (ret)
> >  			continue;
> >
> > -		if (sensor_specs.args_count >= 1) {
> > -			id = sensor_specs.args[0];
> > -			WARN(sensor_specs.args_count > 1,
> > -			     "%pOFn: too many cells in sensor specifier %d\n",
> > -			     sensor_specs.np, sensor_specs.args_count);
> > -		} else {
> > -			id = 0;
> > -		}
> > -
> >  		if (sensor_specs.np == sensor_np && id == sensor_id) {
> >  			tzd = thermal_zone_of_add_sensor(child, sensor_np,
> >  							 data, ops);
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h index
> > 5f4705f..970fb37 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -375,6 +375,9 @@ struct thermal_trip {
> >
> >  /* Function declarations */
> >  #ifdef CONFIG_THERMAL_OF
> > +int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
> > +				  struct of_phandle_args *sensor_specs,
> > +				  u32 *id);
> >  struct thermal_zone_device *
> >  thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
> >  				const struct thermal_zone_of_device_ops
> *ops); @@ -386,6 +389,13
> > @@ struct thermal_zone_device
> *devm_thermal_zone_of_sensor_register(
> >  void devm_thermal_zone_of_sensor_unregister(struct device *dev,
> >  					    struct thermal_zone_device *tz);
> #else
> > +
> > +static int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
> > +					 struct of_phandle_args
> *sensor_specs,
> > +					 u32 *id)
> > +{
> > +	return -ENOENT;
> > +}
> >  static inline struct thermal_zone_device *
> > thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
> >  				const struct thermal_zone_of_device_ops
> *ops)
> >
> 
> 
> --
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