1 // SPDX-License-Identifier: GPL-2.0
3  *  of-thermal.c - Generic Thermal Management device tree support.
15 #include <linux/thermal.h>
24  * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
35  * thermal_of_get_trip_type - Get phy mode for given device_node
60 	return -ENODEV;  in thermal_of_get_trip_type()
74 	trip->temperature = prop;  in thermal_of_populate_trip()
81 	trip->hysteresis = prop;  in thermal_of_populate_trip()
83 	ret = thermal_of_get_trip_type(np, &trip->type);  in thermal_of_populate_trip()
89 	trip->flags = THERMAL_TRIP_FLAG_RW_TEMP;  in thermal_of_populate_trip()
91 	trip->priv = np;  in thermal_of_populate_trip()
105 		return ERR_PTR(-EINVAL);  in thermal_of_trips_init()
111 		ret = -EINVAL;  in thermal_of_trips_init()
117 		ret = -ENOMEM;  in thermal_of_trips_init()
148 	np = of_find_node_by_name(NULL, "thermal-zones");  in of_thermal_zone_find()
150 		pr_debug("No thermal zones description\n");  in of_thermal_zone_find()
151 		return ERR_PTR(-ENODEV);  in of_thermal_zone_find()
155 	 * Search for each thermal zone, a defined sensor  in of_thermal_zone_find()
162 		count = of_count_phandle_with_args(child, "thermal-sensors",  in of_thermal_zone_find()
163 						   "#thermal-sensor-cells");  in of_thermal_zone_find()
165 			pr_err("%pOFn: missing thermal sensor\n", child);  in of_thermal_zone_find()
166 			tz = ERR_PTR(-EINVAL);  in of_thermal_zone_find()
174 			ret = of_parse_phandle_with_args(child, "thermal-sensors",  in of_thermal_zone_find()
175 							 "#thermal-sensor-cells",  in of_thermal_zone_find()
178 				pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", child, ret);  in of_thermal_zone_find()
191 	tz = ERR_PTR(-ENODEV);  in of_thermal_zone_find()
201 	ret = of_property_read_u32(np, "polling-delay-passive", pdelay);  in thermal_of_monitor_init()
202 	if (ret == -EINVAL) {  in thermal_of_monitor_init()
205 		pr_err("%pOFn: Couldn't get polling-delay-passive: %d\n", np, ret);  in thermal_of_monitor_init()
209 	ret = of_property_read_u32(np, "polling-delay", delay);  in thermal_of_monitor_init()
210 	if (ret == -EINVAL) {  in thermal_of_monitor_init()
213 		pr_err("%pOFn: Couldn't get polling-delay: %d\n", np, ret);  in thermal_of_monitor_init()
227 	tzp->no_hwmon = true;  in thermal_of_parameters_init()
229 	if (!of_property_read_u32(np, "sustainable-power", &prop))  in thermal_of_parameters_init()
230 		tzp->sustainable_power = prop;  in thermal_of_parameters_init()
233 	 * For now, the thermal framework supports only one sensor per  in thermal_of_parameters_init()
234 	 * thermal zone. Thus, we are considering only the first two  in thermal_of_parameters_init()
243 	tzp->slope = coef[0];  in thermal_of_parameters_init()
244 	tzp->offset = coef[1];  in thermal_of_parameters_init()
251 	np = of_find_node_by_name(NULL, "thermal-zones");  in thermal_of_zone_get_by_name()
253 		return ERR_PTR(-ENODEV);  in thermal_of_zone_get_by_name()
255 	tz_np = of_get_child_by_name(np, tz->type);  in thermal_of_zone_get_by_name()
260 		return ERR_PTR(-ENODEV);  in thermal_of_zone_get_by_name()
274 	ret = of_parse_phandle_with_args(map_np, "cooling-device", "#cooling-cells",  in thermal_of_get_cooling_spec()
278 		pr_err("Invalid cooling-device entry\n");  in thermal_of_get_cooling_spec()
289 	if (cooling_spec.np != cdev->np)  in thermal_of_get_cooling_spec()
292 	c->lower = cooling_spec.args[0];  in thermal_of_get_cooling_spec()
293 	c->upper = cooling_spec.args[1];  in thermal_of_get_cooling_spec()
294 	c->weight = weight;  in thermal_of_get_cooling_spec()
313 	cm_np = of_get_child_by_name(tz_np, "cooling-maps");  in thermal_of_should_bind()
323 		if (tr_np != trip->priv)  in thermal_of_should_bind()
327 		count = of_count_phandle_with_args(child, "cooling-device", "#cooling-cells");  in thermal_of_should_bind()
349  * thermal_of_zone_unregister - Cleanup the specific allocated ressources
351  * This function disables the thermal zone and frees the different
352  * ressources allocated specific to the thermal OF.
354  * @tz: a pointer to the thermal zone structure
363  * thermal_of_zone_register - Register a thermal zone with device node
367  * node sensor and identifier. It searches for the thermal zone
368  * associated to the couple sensor/id and retrieves all the thermal
369  * zone properties and registers new thermal zone with those
374  * @data: A private data to be stored in the thermal zone dedicated private area
375  * @ops: A set of thermal sensor ops
377  * Return: a valid thermal zone structure pointer on success.
378  *	- EINVAL: if the device tree thermal description is malformed
379  *	- ENOMEM: if one structure can not be allocated
380  *	- Other negative errors are returned by the underlying called functions
397 		if (PTR_ERR(np) != -ENODEV)  in thermal_of_zone_register()
398 			pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);  in thermal_of_zone_register()
419 	ret = of_property_read_string(np, "critical-action", &action);  in thermal_of_zone_register()
424 	tz = thermal_zone_device_register_with_trips(np->name, trips, ntrips,  in thermal_of_zone_register()
429 		pr_err("Failed to register thermal zone %pOFn: %d\n", np, ret);  in thermal_of_zone_register()
438 		pr_err("Failed to enabled thermal zone '%s', id=%d: %d\n",  in thermal_of_zone_register()
439 		       tz->type, tz->id, ret);  in thermal_of_zone_register()
471  * devm_thermal_of_zone_register - register a thermal tied with the sensor life cycle
475  * @dev: a device structure pointer to sensor to be tied with the thermal zone OF life cycle
477  * @data: a pointer to a private data to be stored in the thermal zone 'devdata' field
488 		return ERR_PTR(-ENOMEM);  in devm_thermal_of_zone_register()
490 	tzd = thermal_of_zone_register(dev->of_node, sensor_id, data, ops);  in devm_thermal_of_zone_register()
504  * devm_thermal_of_zone_unregister - Resource managed version of
510  * thermal zone device registered with devm_thermal_zone_of_sensor_register()
512  * thermal zone device callbacks.