Re: [PATCH 1/6] thermal: Introduce devm_thermal_of_cooling_device_register

[Eduardo Valentin]

Hello Guenter,

On Thu, Apr 18, 2019 at 12:58:15PM -0700, Guenter Roeck wrote:
> thermal_of_cooling_device_register() and thermal_cooling_device_register()
> are typically called from driver probe functions, and
> thermal_cooling_device_unregister() is called from remove functions. This
> makes both a perfect candidate for device managed functions.
> 
> Introduce devm_thermal_of_cooling_device_register(). This function can
> also be used to replace thermal_cooling_device_register() by passing a NULL
> pointer as device node. The new function requires both struct device *
> and struct device_node * as parameters since the struct device_node *
> parameter is not always identical to dev->of_node.
> 
> Don't introduce a device managed remove function since it is not needed
> at this point.

I don't have any objection on adding this API. Only a minor thing below:


> 
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
>  drivers/thermal/thermal_core.c | 49 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/thermal.h        |  5 +++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 6590bb5cb688..e0b530603db6 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1046,6 +1046,55 @@ thermal_of_cooling_device_register(struct device_node *np,
>  }
>  EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
>  
> +static void thermal_cooling_device_release(struct device *dev, void *res)
> +{
> +	thermal_cooling_device_unregister(
> +				*(struct thermal_cooling_device **)res);
> +}
> +
> +/**
> + * devm_thermal_of_cooling_device_register() - register an OF thermal cooling
> + *					       device
> + * @dev:	a valid struct device pointer of a sensor device.
> + * @np:		a pointer to a device tree node.
> + * @type:	the thermal cooling device type.
> + * @devdata:	device private data.
> + * @ops:	standard thermal cooling devices callbacks.
> + *
> + * This function will register a cooling device with device tree node reference.
> + * This interface function adds a new thermal cooling device (fan/processor/...)
> + * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
> + * to all the thermal zone devices registered at the same time.
> + *
> + * Return: a pointer to the created struct thermal_cooling_device or an
> + * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
> + */
> +struct thermal_cooling_device *
> +devm_thermal_of_cooling_device_register(struct device *dev,
> +				struct device_node *np,
> +				char *type, void *devdata,
> +				const struct thermal_cooling_device_ops *ops)
> +{
> +	struct thermal_cooling_device **ptr, *tcd;
> +
> +	ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
> +			   GFP_KERNEL);
> +	if (!ptr)
> +		return ERR_PTR(-ENOMEM);
> +
> +	tcd = __thermal_cooling_device_register(np, type, devdata, ops);
> +	if (IS_ERR(tcd)) {
> +		devres_free(ptr);
> +		return tcd;
> +	}
> +
> +	*ptr = tcd;
> +	devres_add(dev, ptr);
> +
> +	return tcd;
> +}
> +EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
> +
>  static void __unbind(struct thermal_zone_device *tz, int mask,
>  		     struct thermal_cooling_device *cdev)
>  {
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 5f4705f46c2f..43cf4fdd71d4 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -447,6 +447,11 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
>  struct thermal_cooling_device *
>  thermal_of_cooling_device_register(struct device_node *np, char *, void *,
>  				   const struct thermal_cooling_device_ops *);
> +struct thermal_cooling_device *
> +devm_thermal_of_cooling_device_register(struct device *dev,
> +				struct device_node *np,
> +				char *type, void *devdata,
> +				const struct thermal_cooling_device_ops *ops);

We need to stub this in case thermal is not selected.

>  void thermal_cooling_device_unregister(struct thermal_cooling_device *);
>  struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
>  int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);

Something like:


diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 43cf4fd..9b1b365 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -508,6 +508,14 @@ static inline struct thermal_cooling_device *
 thermal_of_cooling_device_register(struct device_node *np,
        char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
 { return ERR_PTR(-ENODEV); }
+struct thermal_cooling_device *
+devm_thermal_of_cooling_device_register(struct device *dev,
+                               struct device_node *np,
+                               char *type, void *devdata,
+                               const struct thermal_cooling_device_ops *ops)
+{
+       return ERR_PTR(-ENODEV);
+}
 static inline void thermal_cooling_device_unregister(
        struct thermal_cooling_device *cdev)
 { }
~


If you want I can amend this to your patch and apply it.

Also, do you prefer me to collect only this patch and you would collect hwmon changes,
or are you ok if I collect all the series?