Re: [PATCH v3 09/12] thermal/core: Register with the trip points

[Zhang Rui]

On Sun, 2022-07-03 at 20:30 +0200, Daniel Lezcano wrote:
> As we added the thermal trip points structure in the thermal zone,
> let's extend the thermal zone register function to have the thermal
> trip structures as a parameter and store it in the 'trips' field of
> the thermal zone structure.

Just FYI.

I proposed a small topic for this year' LPC about the
thermal_zone_device_register() parameters.
We have more and more parameters introduced, IMO, it's better to use a
unified structure for registration phase configurations, or reuse
struct thermal_zone_params.
In this way, when a new parameter is needed, we only need to introduce
a new field in the structure, rather than update every caller of this
API, or introduce new wrapper functions like we did in this patch.

thanks,
rui
> 
> Cc: Alexandre Bailon <abailon@xxxxxxxxxxxx>
> Cc: Kevin Hilman <khilman@xxxxxxxxxxxx>
> Cc; Eduardo Valentin <eduval@xxxxxxxxxx>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> ---
>  drivers/thermal/thermal_core.c | 22 +++++++++++++++++-----
>  drivers/thermal/thermal_core.h |  4 ++--
>  include/linux/thermal.h        |  6 ++++++
>  3 files changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c
> b/drivers/thermal/thermal_core.c
> index 434a675da245..e865c41d2320 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1167,8 +1167,9 @@ static void thermal_set_delay_jiffies(unsigned
> long *delay_jiffies, int delay_ms
>  }
>  
>  /**
> - * thermal_zone_device_register() - register a new thermal zone
> device
> + * thermal_zone_device_register_with_trips() - register a new
> thermal zone device
>   * @type:	the thermal zone device type
> + * @trips:	a pointer to an array of thermal trips
>   * @ntrips:	the number of trip points the thermal zone support
>   * @mask:	a bit string indicating the writeablility of trip
> points
>   * @devdata:	private device data
> @@ -1191,10 +1192,10 @@ static void
> thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms
>   * IS_ERR*() helpers.
>   */
>  struct thermal_zone_device *
> -thermal_zone_device_register(const char *type, int ntrips, int mask,
> -			     void *devdata, struct
> thermal_zone_device_ops *ops,
> -			     struct thermal_zone_params *tzp, int
> passive_delay,
> -			     int polling_delay)
> +thermal_zone_device_register_with_trips(const char *type, struct
> thermal_trip *trips, int ntrips, int mask,
> +					void *devdata, struct
> thermal_zone_device_ops *ops,
> +					struct thermal_zone_params
> *tzp, int passive_delay,
> +					int polling_delay)
>  {
>  	struct thermal_zone_device *tz;
>  	enum thermal_trip_type trip_type;
> @@ -1256,6 +1257,7 @@ thermal_zone_device_register(const char *type,
> int ntrips, int mask,
>  	tz->device.class = &thermal_class;
>  	tz->devdata = devdata;
>  	tz->ntrips = ntrips;
> +	tz->trips = trips;
>  
>  	thermal_set_delay_jiffies(&tz->passive_delay_jiffies,
> passive_delay);
>  	thermal_set_delay_jiffies(&tz->polling_delay_jiffies,
> polling_delay);
> @@ -1331,6 +1333,16 @@ thermal_zone_device_register(const char *type,
> int ntrips, int mask,
>  	kfree(tz);
>  	return ERR_PTR(result);
>  }
> +
> +struct thermal_zone_device *thermal_zone_device_register(const char
> *type, int ntrips, int mask,
> +							 void *devdata,
> struct thermal_zone_device_ops *ops,
> +							 struct
> thermal_zone_params *tzp, int passive_delay,
> +							 int
> polling_delay)
> +{
> +	return thermal_zone_device_register_with_trips(type, NULL,
> ntrips, mask,
> +						       devdata, ops,
> tzp,
> +						       passive_delay,
> polling_delay);
> +}
>  EXPORT_SYMBOL_GPL(thermal_zone_device_register);
>  
>  /**
> diff --git a/drivers/thermal/thermal_core.h
> b/drivers/thermal/thermal_core.h
> index 84e341c1e0fc..bbe3ec26d12e 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -113,12 +113,12 @@ int thermal_build_list_of_policies(char *buf);
>  /* Helpers */
>  void thermal_zone_set_trips(struct thermal_zone_device *tz);
>  
> -static inline struct thermal_trip *thermal_zone_get_trips(struct
> thermal_zone *tz)
> +static inline struct thermal_trip *thermal_zone_get_trips(struct
> thermal_zone_device *tz)
>  {
>  	return tz->trips;
>  }
>  
> -static inline int thermal_zone_get_ntrips(struct thermal_zone *tz)
> +static inline int thermal_zone_get_ntrips(struct thermal_zone_device
> *tz)
>  {
>  	return tz->ntrips;
>  }
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 3733e23b6359..8cbe237a92d0 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -379,8 +379,14 @@ void
> devm_thermal_zone_of_sensor_unregister(struct device *dev,
>  struct thermal_zone_device *thermal_zone_device_register(const char
> *, int, int,
>  		void *, struct thermal_zone_device_ops *,
>  		struct thermal_zone_params *, int, int);
> +
>  void thermal_zone_device_unregister(struct thermal_zone_device *);
>  
> +struct thermal_zone_device *
> +thermal_zone_device_register_with_trips(const char *, struct
> thermal_trip *, int, int,
> +					void *, struct
> thermal_zone_device_ops *,
> +					struct thermal_zone_params *,
> int, int);
> +
>  int thermal_zone_bind_cooling_device(struct thermal_zone_device *,
> int,
>  				     struct thermal_cooling_device *,
>  				     unsigned long, unsigned long,