thermal/of: Move cooling device OF helpers out of thermal core

The functions:
 - thermal_of_cooling_device_register()
 - devm_thermal_of_cooling_device_register()

are specific to device tree usage but are currently implemented in
thermal_core.c.

Move them to thermal_of.c to better reflect the separation between
generic thermal core code and OF-specific logic.

This change is enabled by the recent split of the cooling device
registration into allocation and addition phases, allowing OF-specific
handling (such as device node assignment) to be isolated from the core.

No functional change intended.

Signed-off-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Link: https://patch.msgid.link/20260526140802.1059293-17-daniel.lezcano@oss.qualcomm.com

drivers/thermal/thermal_core.c

@@ -963,7 +963,7 @@ static void thermal_cdev_release(struct device *dev)
 	kfree(cdev);
 }
 
-static struct thermal_cooling_device *
+struct thermal_cooling_device *
 thermal_cooling_device_alloc(const char *type, const struct thermal_cooling_device_ops *ops)
 {
 	struct thermal_cooling_device *cdev;
@@ -1002,7 +1002,7 @@ thermal_cooling_device_alloc(const char *type, const struct thermal_cooling_devi
 	return ERR_PTR(ret);
 }
 
-static int thermal_cooling_device_add(struct thermal_cooling_device *cdev, void *devdata)
+int thermal_cooling_device_add(struct thermal_cooling_device *cdev, void *devdata)
 {
 	unsigned long current_state;
 	int ret;
@@ -1090,44 +1090,6 @@ thermal_cooling_device_register(const char *type, void *devdata,
 }
 EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
 
-/**
- * thermal_of_cooling_device_register() - register an OF thermal cooling 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 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.
- * It also gives the opportunity to link the cooling device to a device tree
- * node, so that it can be bound to a thermal zone created out of device tree.
- *
- * 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 *
-thermal_of_cooling_device_register(struct device_node *np,
-				     const char *type, void *devdata,
-				     const struct thermal_cooling_device_ops *ops)
-{
-	struct thermal_cooling_device *cdev;
-	int ret;
-
-	cdev = thermal_cooling_device_alloc(type, ops);
-	if (IS_ERR(cdev))
-		return cdev;
-
-	cdev->np = np;
-
-	ret = thermal_cooling_device_add(cdev, devdata);
-	if (ret)
-		return ERR_PTR(ret);
-
-	return cdev;
-}
-EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
-
 static void thermal_cooling_device_release(void *data)
 {
 	struct thermal_cooling_device *cdev = data;
@@ -1135,44 +1097,6 @@ static void thermal_cooling_device_release(void *data)
 	thermal_cooling_device_unregister(cdev);
 }
 
-/**
- * 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,
-				const char *type, void *devdata,
-				const struct thermal_cooling_device_ops *ops)
-{
-	struct thermal_cooling_device *cdev;
-	int ret;
-
-	cdev = thermal_of_cooling_device_register(np, type, devdata, ops);
-	if (IS_ERR(cdev))
-		return cdev;
-
-	ret = devm_add_action_or_reset(dev, thermal_cooling_device_release, cdev);
-	if (ret)
-		return ERR_PTR(ret);
-
-	return cdev;
-}
-EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
-
 /**
  * devm_thermal_cooling_device_register() - register a thermal cooling device
  *

drivers/thermal/thermal_core.h

@@ -267,6 +267,11 @@ void thermal_zone_device_critical_shutdown(struct thermal_zone_device *tz);
 void thermal_governor_update_tz(struct thermal_zone_device *tz,
 				enum thermal_notify_event reason);
 
+struct thermal_cooling_device *
+thermal_cooling_device_alloc(const char *type, const struct thermal_cooling_device_ops *ops);
+
+int thermal_cooling_device_add(struct thermal_cooling_device *cdev, void *devdata);
+
 /* Helpers */
 #define for_each_trip_desc(__tz, __td)	\
 	for (__td = __tz->trips; __td - __tz->trips < __tz->num_trips; __td++)

drivers/thermal/thermal_of.c

@@ -510,3 +510,86 @@ void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_dev
 			       devm_thermal_of_zone_match, tz));
 }
 EXPORT_SYMBOL_GPL(devm_thermal_of_zone_unregister);
+
+/**
+ * thermal_of_cooling_device_register() - register an OF thermal cooling 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 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.
+ * It also gives the opportunity to link the cooling device to a device tree
+ * node, so that it can be bound to a thermal zone created out of device tree.
+ *
+ * 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 *
+thermal_of_cooling_device_register(struct device_node *np,
+				     const char *type, void *devdata,
+				     const struct thermal_cooling_device_ops *ops)
+{
+	struct thermal_cooling_device *cdev;
+	int ret;
+
+	cdev = thermal_cooling_device_alloc(type, ops);
+	if (IS_ERR(cdev))
+		return cdev;
+
+	cdev->np = np;
+
+	ret = thermal_cooling_device_add(cdev, devdata);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return cdev;
+}
+EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
+
+static void thermal_of_cooling_device_release(void *data)
+{
+	struct thermal_cooling_device *cdev = data;
+
+	thermal_cooling_device_unregister(cdev);
+}
+
+/**
+ * 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,
+                                const char *type, void *devdata,
+                                const struct thermal_cooling_device_ops *ops)
+{
+        struct thermal_cooling_device *cdev;
+        int ret;
+
+        cdev = thermal_of_cooling_device_register(np, type, devdata, ops);
+        if (IS_ERR(cdev))
+                return cdev;
+
+        ret = devm_add_action_or_reset(dev, thermal_of_cooling_device_release, cdev);
+        if (ret)
+                return ERR_PTR(ret);
+
+        return cdev;
+}
+EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);

include/linux/thermal.h

@@ -198,6 +198,15 @@ struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, in
 
 void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz);
 
+struct thermal_cooling_device *
+thermal_of_cooling_device_register(struct device_node *np, const char *type, void *devdata,
+				   const struct thermal_cooling_device_ops *ops);
+
+struct thermal_cooling_device *
+devm_thermal_of_cooling_device_register(struct device *dev,
+					struct device_node *np,
+					const char *type, void *devdata,
+					const struct thermal_cooling_device_ops *ops);
 #else
 
 static inline
@@ -211,6 +220,23 @@ static inline void devm_thermal_of_zone_unregister(struct device *dev,
 						   struct thermal_zone_device *tz)
 {
 }
+
+static inline struct thermal_cooling_device *
+thermal_of_cooling_device_register(struct device_node *np,
+				   const char *type, void *devdata,
+				   const struct thermal_cooling_device_ops *ops)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline struct thermal_cooling_device *
+devm_thermal_of_cooling_device_register(struct device *dev,
+					struct device_node *np,
+					const char *type, void *devdata,
+					const struct thermal_cooling_device_ops *ops)
+{
+	return ERR_PTR(-ENODEV);
+}
 #endif
 
 int for_each_thermal_trip(struct thermal_zone_device *tz,
@@ -252,17 +278,11 @@ void thermal_zone_device_update(struct thermal_zone_device *,
 
 struct thermal_cooling_device *thermal_cooling_device_register(const char *,
 		void *, const struct thermal_cooling_device_ops *);
+
 struct thermal_cooling_device *
 devm_thermal_cooling_device_register(struct device *dev, const char *type, void *devdata,
 				     const struct thermal_cooling_device_ops *ops);
-struct thermal_cooling_device *
-thermal_of_cooling_device_register(struct device_node *np, const char *type, void *devdata,
-				   const struct thermal_cooling_device_ops *ops);
-struct thermal_cooling_device *
-devm_thermal_of_cooling_device_register(struct device *dev,
-				struct device_node *np,
-				const char *type, void *devdata,
-				const struct thermal_cooling_device_ops *ops);
+
 void thermal_cooling_device_update(struct thermal_cooling_device *);
 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
@@ -308,18 +328,7 @@ thermal_cooling_device_register(const char *type, void *devdata,
 	const struct thermal_cooling_device_ops *ops)
 { return ERR_PTR(-ENODEV); }
 static inline struct thermal_cooling_device *
-thermal_of_cooling_device_register(struct device_node *np,
-	const char *type, void *devdata,
-	const struct thermal_cooling_device_ops *ops)
-{ return ERR_PTR(-ENODEV); }
-static inline struct thermal_cooling_device *
-devm_thermal_of_cooling_device_register(struct device *dev,
-				struct device_node *np,
-				const 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)
 { }