1 // SPDX-License-Identifier: GPL-2.0
3 * of-thermal.c - Generic Thermal Management device tree support.
5 * Copyright (C) 2013 Texas Instruments
6 * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/err.h>
12 #include <linux/export.h>
13 #include <linux/of_device.h>
14 #include <linux/of_platform.h>
15 #include <linux/slab.h>
16 #include <linux/thermal.h>
17 #include <linux/types.h>
18 #include <linux/string.h>
20 #include "thermal_core.h"
22 /*** Private data structures to represent thermal device tree data ***/
25 * struct __thermal_cooling_bind_param - a cooling device for a trip point
26 * @cooling_device: a pointer to identify the referred cooling device
27 * @min: minimum cooling state used at this trip point
28 * @max: maximum cooling state used at this trip point
31 struct __thermal_cooling_bind_param {
32 struct device_node *cooling_device;
38 * struct __thermal_bind_param - a match between trip and cooling device
39 * @tcbp: a pointer to an array of cooling devices
40 * @count: number of elements in array
41 * @trip_id: the trip point index
42 * @usage: the percentage (from 0 to 100) of cooling contribution
45 struct __thermal_bind_params {
46 struct __thermal_cooling_bind_param *tcbp;
53 * struct __thermal_zone - internal representation of a thermal zone
54 * @mode: current thermal zone device mode (enabled/disabled)
55 * @passive_delay: polling interval while passive cooling is activated
56 * @polling_delay: zone polling interval
57 * @slope: slope of the temperature adjustment curve
58 * @offset: offset of the temperature adjustment curve
59 * @ntrips: number of trip points
60 * @trips: an array of trip points (0..ntrips - 1)
61 * @num_tbps: number of thermal bind params
62 * @tbps: an array of thermal bind params (0..num_tbps - 1)
63 * @sensor_data: sensor private data used while reading temperature and trend
64 * @ops: set of callbacks to handle the thermal zone based on DT
67 struct __thermal_zone {
68 enum thermal_device_mode mode;
76 struct thermal_trip *trips;
78 /* cooling binding data */
80 struct __thermal_bind_params *tbps;
82 /* sensor interface */
84 const struct thermal_zone_of_device_ops *ops;
87 /*** DT thermal zone device callbacks ***/
89 static int of_thermal_get_temp(struct thermal_zone_device *tz,
92 struct __thermal_zone *data = tz->devdata;
94 if (!data->ops->get_temp)
97 return data->ops->get_temp(data->sensor_data, temp);
100 static int of_thermal_set_trips(struct thermal_zone_device *tz,
103 struct __thermal_zone *data = tz->devdata;
105 if (!data->ops || !data->ops->set_trips)
108 return data->ops->set_trips(data->sensor_data, low, high);
112 * of_thermal_get_ntrips - function to export number of available trip
114 * @tz: pointer to a thermal zone
116 * This function is a globally visible wrapper to get number of trip points
117 * stored in the local struct __thermal_zone
119 * Return: number of available trip points, -ENODEV when data not available
121 int of_thermal_get_ntrips(struct thermal_zone_device *tz)
123 struct __thermal_zone *data = tz->devdata;
125 if (!data || IS_ERR(data))
130 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
133 * of_thermal_is_trip_valid - function to check if trip point is valid
135 * @tz: pointer to a thermal zone
136 * @trip: trip point to evaluate
138 * This function is responsible for checking if passed trip point is valid
140 * Return: true if trip point is valid, false otherwise
142 bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
144 struct __thermal_zone *data = tz->devdata;
146 if (!data || trip >= data->ntrips || trip < 0)
151 EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
154 * of_thermal_get_trip_points - function to get access to a globally exported
157 * @tz: pointer to a thermal zone
159 * This function provides a pointer to trip points table
161 * Return: pointer to trip points table, NULL otherwise
163 const struct thermal_trip *
164 of_thermal_get_trip_points(struct thermal_zone_device *tz)
166 struct __thermal_zone *data = tz->devdata;
173 EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
176 * of_thermal_set_emul_temp - function to set emulated temperature
178 * @tz: pointer to a thermal zone
179 * @temp: temperature to set
181 * This function gives the ability to set emulated value of temperature,
182 * which is handy for debugging
184 * Return: zero on success, error code otherwise
186 static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
189 struct __thermal_zone *data = tz->devdata;
191 return data->ops->set_emul_temp(data->sensor_data, temp);
194 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
195 enum thermal_trend *trend)
197 struct __thermal_zone *data = tz->devdata;
199 if (!data->ops->get_trend)
202 return data->ops->get_trend(data->sensor_data, trip, trend);
205 static int of_thermal_bind(struct thermal_zone_device *thermal,
206 struct thermal_cooling_device *cdev)
208 struct __thermal_zone *data = thermal->devdata;
209 struct __thermal_bind_params *tbp;
210 struct __thermal_cooling_bind_param *tcbp;
213 if (!data || IS_ERR(data))
216 /* find where to bind */
217 for (i = 0; i < data->num_tbps; i++) {
218 tbp = data->tbps + i;
220 for (j = 0; j < tbp->count; j++) {
221 tcbp = tbp->tcbp + j;
223 if (tcbp->cooling_device == cdev->np) {
226 ret = thermal_zone_bind_cooling_device(thermal,
240 static int of_thermal_unbind(struct thermal_zone_device *thermal,
241 struct thermal_cooling_device *cdev)
243 struct __thermal_zone *data = thermal->devdata;
244 struct __thermal_bind_params *tbp;
245 struct __thermal_cooling_bind_param *tcbp;
248 if (!data || IS_ERR(data))
251 /* find where to unbind */
252 for (i = 0; i < data->num_tbps; i++) {
253 tbp = data->tbps + i;
255 for (j = 0; j < tbp->count; j++) {
256 tcbp = tbp->tcbp + j;
258 if (tcbp->cooling_device == cdev->np) {
261 ret = thermal_zone_unbind_cooling_device(thermal,
272 static int of_thermal_get_mode(struct thermal_zone_device *tz,
273 enum thermal_device_mode *mode)
275 struct __thermal_zone *data = tz->devdata;
282 static int of_thermal_set_mode(struct thermal_zone_device *tz,
283 enum thermal_device_mode mode)
285 struct __thermal_zone *data = tz->devdata;
287 mutex_lock(&tz->lock);
289 if (mode == THERMAL_DEVICE_ENABLED) {
290 tz->polling_delay = data->polling_delay;
291 tz->passive_delay = data->passive_delay;
293 tz->polling_delay = 0;
294 tz->passive_delay = 0;
297 mutex_unlock(&tz->lock);
300 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
305 static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
306 enum thermal_trip_type *type)
308 struct __thermal_zone *data = tz->devdata;
310 if (trip >= data->ntrips || trip < 0)
313 *type = data->trips[trip].type;
318 static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
321 struct __thermal_zone *data = tz->devdata;
323 if (trip >= data->ntrips || trip < 0)
326 *temp = data->trips[trip].temperature;
331 static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
334 struct __thermal_zone *data = tz->devdata;
336 if (trip >= data->ntrips || trip < 0)
339 if (data->ops->set_trip_temp) {
342 ret = data->ops->set_trip_temp(data->sensor_data, trip, temp);
347 /* thermal framework should take care of data->mask & (1 << trip) */
348 data->trips[trip].temperature = temp;
353 static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
356 struct __thermal_zone *data = tz->devdata;
358 if (trip >= data->ntrips || trip < 0)
361 *hyst = data->trips[trip].hysteresis;
366 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
369 struct __thermal_zone *data = tz->devdata;
371 if (trip >= data->ntrips || trip < 0)
374 /* thermal framework should take care of data->mask & (1 << trip) */
375 data->trips[trip].hysteresis = hyst;
380 static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
383 struct __thermal_zone *data = tz->devdata;
386 for (i = 0; i < data->ntrips; i++)
387 if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
388 *temp = data->trips[i].temperature;
395 static struct thermal_zone_device_ops of_thermal_ops = {
396 .get_mode = of_thermal_get_mode,
397 .set_mode = of_thermal_set_mode,
399 .get_trip_type = of_thermal_get_trip_type,
400 .get_trip_temp = of_thermal_get_trip_temp,
401 .set_trip_temp = of_thermal_set_trip_temp,
402 .get_trip_hyst = of_thermal_get_trip_hyst,
403 .set_trip_hyst = of_thermal_set_trip_hyst,
404 .get_crit_temp = of_thermal_get_crit_temp,
406 .bind = of_thermal_bind,
407 .unbind = of_thermal_unbind,
412 static struct thermal_zone_device *
413 thermal_zone_of_add_sensor(struct device_node *zone,
414 struct device_node *sensor, void *data,
415 const struct thermal_zone_of_device_ops *ops)
417 struct thermal_zone_device *tzd;
418 struct __thermal_zone *tz;
420 tzd = thermal_zone_get_zone_by_name(zone->name);
422 return ERR_PTR(-EPROBE_DEFER);
427 return ERR_PTR(-EINVAL);
429 mutex_lock(&tzd->lock);
431 tz->sensor_data = data;
433 tzd->ops->get_temp = of_thermal_get_temp;
434 tzd->ops->get_trend = of_thermal_get_trend;
437 * The thermal zone core will calculate the window if they have set the
438 * optional set_trips pointer.
441 tzd->ops->set_trips = of_thermal_set_trips;
443 if (ops->set_emul_temp)
444 tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
446 mutex_unlock(&tzd->lock);
452 * thermal_zone_of_get_sensor_id - get sensor ID from a DT thermal zone
453 * @tz_np: a valid thermal zone device node.
454 * @sensor_np: a sensor node of a valid sensor device.
455 * @id: the sensor ID returned if success.
457 * This function will get sensor ID from a given thermal zone node and
458 * the sensor node must match the temperature provider @sensor_np.
460 * Return: 0 on success, proper error code otherwise.
463 int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
464 struct device_node *sensor_np,
467 struct of_phandle_args sensor_specs;
470 ret = of_parse_phandle_with_args(tz_np,
472 "#thermal-sensor-cells",
478 if (sensor_specs.np != sensor_np) {
479 of_node_put(sensor_specs.np);
483 if (sensor_specs.args_count > 1)
484 pr_warn("%pOFn: too many cells in sensor specifier %d\n",
485 sensor_specs.np, sensor_specs.args_count);
487 *id = sensor_specs.args_count ? sensor_specs.args[0] : 0;
489 of_node_put(sensor_specs.np);
493 EXPORT_SYMBOL_GPL(thermal_zone_of_get_sensor_id);
496 * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
497 * @dev: a valid struct device pointer of a sensor device. Must contain
498 * a valid .of_node, for the sensor node.
499 * @sensor_id: a sensor identifier, in case the sensor IP has more
501 * @data: a private pointer (owned by the caller) that will be passed
502 * back, when a temperature reading is needed.
503 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
505 * This function will search the list of thermal zones described in device
506 * tree and look for the zone that refer to the sensor device pointed by
507 * @dev->of_node as temperature providers. For the zone pointing to the
508 * sensor node, the sensor will be added to the DT thermal zone device.
510 * The thermal zone temperature is provided by the @get_temp function
511 * pointer. When called, it will have the private pointer @data back.
513 * The thermal zone temperature trend is provided by the @get_trend function
514 * pointer. When called, it will have the private pointer @data back.
517 * 01 - This function must enqueue the new sensor instead of using
518 * it as the only source of temperature values.
520 * 02 - There must be a way to match the sensor with all thermal zones
523 * Return: On success returns a valid struct thermal_zone_device,
524 * otherwise, it returns a corresponding ERR_PTR(). Caller must
525 * check the return value with help of IS_ERR() helper.
527 struct thermal_zone_device *
528 thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
529 const struct thermal_zone_of_device_ops *ops)
531 struct device_node *np, *child, *sensor_np;
532 struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
534 np = of_find_node_by_name(NULL, "thermal-zones");
536 return ERR_PTR(-ENODEV);
538 if (!dev || !dev->of_node) {
540 return ERR_PTR(-ENODEV);
543 sensor_np = of_node_get(dev->of_node);
545 for_each_available_child_of_node(np, child) {
548 /* For now, thermal framework supports only 1 sensor per zone */
549 ret = thermal_zone_of_get_sensor_id(child, sensor_np, &id);
553 if (id == sensor_id) {
554 tzd = thermal_zone_of_add_sensor(child, sensor_np,
557 tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
564 of_node_put(sensor_np);
569 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
572 * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone
573 * @dev: a valid struct device pointer of a sensor device. Must contain
574 * a valid .of_node, for the sensor node.
575 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
577 * This function removes the sensor callbacks and private data from the
578 * thermal zone device registered with thermal_zone_of_sensor_register()
579 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
580 * thermal zone device callbacks.
582 * TODO: When the support to several sensors per zone is added, this
583 * function must search the sensor list based on @dev parameter.
586 void thermal_zone_of_sensor_unregister(struct device *dev,
587 struct thermal_zone_device *tzd)
589 struct __thermal_zone *tz;
591 if (!dev || !tzd || !tzd->devdata)
596 /* no __thermal_zone, nothing to be done */
600 mutex_lock(&tzd->lock);
601 tzd->ops->get_temp = NULL;
602 tzd->ops->get_trend = NULL;
603 tzd->ops->set_emul_temp = NULL;
606 tz->sensor_data = NULL;
607 mutex_unlock(&tzd->lock);
609 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
611 static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
613 thermal_zone_of_sensor_unregister(dev,
614 *(struct thermal_zone_device **)res);
617 static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
620 struct thermal_zone_device **r = res;
622 if (WARN_ON(!r || !*r))
629 * devm_thermal_zone_of_sensor_register - Resource managed version of
630 * thermal_zone_of_sensor_register()
631 * @dev: a valid struct device pointer of a sensor device. Must contain
632 * a valid .of_node, for the sensor node.
633 * @sensor_id: a sensor identifier, in case the sensor IP has more
635 * @data: a private pointer (owned by the caller) that will be passed
636 * back, when a temperature reading is needed.
637 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
639 * Refer thermal_zone_of_sensor_register() for more details.
641 * Return: On success returns a valid struct thermal_zone_device,
642 * otherwise, it returns a corresponding ERR_PTR(). Caller must
643 * check the return value with help of IS_ERR() helper.
644 * Registered thermal_zone_device device will automatically be
645 * released when device is unbounded.
647 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
648 struct device *dev, int sensor_id,
649 void *data, const struct thermal_zone_of_device_ops *ops)
651 struct thermal_zone_device **ptr, *tzd;
653 ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
656 return ERR_PTR(-ENOMEM);
658 tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
665 devres_add(dev, ptr);
669 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
672 * devm_thermal_zone_of_sensor_unregister - Resource managed version of
673 * thermal_zone_of_sensor_unregister().
674 * @dev: Device for which which resource was allocated.
675 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
677 * This function removes the sensor callbacks and private data from the
678 * thermal zone device registered with devm_thermal_zone_of_sensor_register()
679 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
680 * thermal zone device callbacks.
681 * Normally this function will not need to be called and the resource
682 * management code will ensure that the resource is freed.
684 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
685 struct thermal_zone_device *tzd)
687 WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
688 devm_thermal_zone_of_sensor_match, tzd));
690 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
692 /*** functions parsing device tree nodes ***/
695 * thermal_of_populate_bind_params - parse and fill cooling map data
696 * @np: DT node containing a cooling-map node
697 * @__tbp: data structure to be filled with cooling map info
698 * @trips: array of thermal zone trip points
699 * @ntrips: number of trip points inside trips.
701 * This function parses a cooling-map type of node represented by
702 * @np parameter and fills the read data into @__tbp data structure.
703 * It needs the already parsed array of trip points of the thermal zone
706 * Return: 0 on success, proper error code otherwise
708 static int thermal_of_populate_bind_params(struct device_node *np,
709 struct __thermal_bind_params *__tbp,
710 struct thermal_trip *trips,
713 struct of_phandle_args cooling_spec;
714 struct __thermal_cooling_bind_param *__tcbp;
715 struct device_node *trip;
719 /* Default weight. Usage is optional */
720 __tbp->usage = THERMAL_WEIGHT_DEFAULT;
721 ret = of_property_read_u32(np, "contribution", &prop);
725 trip = of_parse_phandle(np, "trip", 0);
727 pr_err("missing trip property\n");
731 /* match using device_node */
732 for (i = 0; i < ntrips; i++)
733 if (trip == trips[i].np) {
743 count = of_count_phandle_with_args(np, "cooling-device",
746 pr_err("Add a cooling_device property with at least one device\n");
750 __tcbp = kcalloc(count, sizeof(*__tcbp), GFP_KERNEL);
754 for (i = 0; i < count; i++) {
755 ret = of_parse_phandle_with_args(np, "cooling-device",
756 "#cooling-cells", i, &cooling_spec);
758 pr_err("Invalid cooling-device entry\n");
762 __tcbp[i].cooling_device = cooling_spec.np;
764 if (cooling_spec.args_count >= 2) { /* at least min and max */
765 __tcbp[i].min = cooling_spec.args[0];
766 __tcbp[i].max = cooling_spec.args[1];
768 pr_err("wrong reference to cooling device, missing limits\n");
772 __tbp->tcbp = __tcbp;
773 __tbp->count = count;
778 for (i = i - 1; i >= 0; i--)
779 of_node_put(__tcbp[i].cooling_device);
788 * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
789 * into the device tree binding of 'trip', property type.
791 static const char * const trip_types[] = {
792 [THERMAL_TRIP_ACTIVE] = "active",
793 [THERMAL_TRIP_PASSIVE] = "passive",
794 [THERMAL_TRIP_HOT] = "hot",
795 [THERMAL_TRIP_CRITICAL] = "critical",
799 * thermal_of_get_trip_type - Get phy mode for given device_node
800 * @np: Pointer to the given device_node
801 * @type: Pointer to resulting trip type
803 * The function gets trip type string from property 'type',
804 * and store its index in trip_types table in @type,
806 * Return: 0 on success, or errno in error case.
808 static int thermal_of_get_trip_type(struct device_node *np,
809 enum thermal_trip_type *type)
814 err = of_property_read_string(np, "type", &t);
818 for (i = 0; i < ARRAY_SIZE(trip_types); i++)
819 if (!strcasecmp(t, trip_types[i])) {
828 * thermal_of_populate_trip - parse and fill one trip point data
829 * @np: DT node containing a trip point node
830 * @trip: trip point data structure to be filled up
832 * This function parses a trip point type of node represented by
833 * @np parameter and fills the read data into @trip data structure.
835 * Return: 0 on success, proper error code otherwise
837 static int thermal_of_populate_trip(struct device_node *np,
838 struct thermal_trip *trip)
843 ret = of_property_read_u32(np, "temperature", &prop);
845 pr_err("missing temperature property\n");
848 trip->temperature = prop;
850 ret = of_property_read_u32(np, "hysteresis", &prop);
852 pr_err("missing hysteresis property\n");
855 trip->hysteresis = prop;
857 ret = thermal_of_get_trip_type(np, &trip->type);
859 pr_err("wrong trip type property\n");
863 /* Required for cooling map matching */
871 * thermal_of_build_thermal_zone - parse and fill one thermal zone data
872 * @np: DT node containing a thermal zone node
874 * This function parses a thermal zone type of node represented by
875 * @np parameter and fills the read data into a __thermal_zone data structure
876 * and return this pointer.
878 * TODO: Missing properties to parse: thermal-sensor-names
880 * Return: On success returns a valid struct __thermal_zone,
881 * otherwise, it returns a corresponding ERR_PTR(). Caller must
882 * check the return value with help of IS_ERR() helper.
884 static struct __thermal_zone
885 __init *thermal_of_build_thermal_zone(struct device_node *np)
887 struct device_node *child = NULL, *gchild;
888 struct __thermal_zone *tz;
893 pr_err("no thermal zone np\n");
894 return ERR_PTR(-EINVAL);
897 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
899 return ERR_PTR(-ENOMEM);
901 ret = of_property_read_u32(np, "polling-delay-passive", &prop);
903 pr_err("%pOFn: missing polling-delay-passive property\n", np);
906 tz->passive_delay = prop;
908 ret = of_property_read_u32(np, "polling-delay", &prop);
910 pr_err("%pOFn: missing polling-delay property\n", np);
913 tz->polling_delay = prop;
916 * REVIST: for now, the thermal framework supports only
917 * one sensor per thermal zone. Thus, we are considering
918 * only the first two values as slope and offset.
920 ret = of_property_read_u32_array(np, "coefficients", coef, 2);
923 tz->offset = coef[1];
930 child = of_get_child_by_name(np, "trips");
932 /* No trips provided */
936 tz->ntrips = of_get_child_count(child);
937 if (tz->ntrips == 0) /* must have at least one child */
940 tz->trips = kcalloc(tz->ntrips, sizeof(*tz->trips), GFP_KERNEL);
947 for_each_child_of_node(child, gchild) {
948 ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
956 child = of_get_child_by_name(np, "cooling-maps");
958 /* cooling-maps not provided */
962 tz->num_tbps = of_get_child_count(child);
963 if (tz->num_tbps == 0)
966 tz->tbps = kcalloc(tz->num_tbps, sizeof(*tz->tbps), GFP_KERNEL);
973 for_each_child_of_node(child, gchild) {
974 ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
975 tz->trips, tz->ntrips);
982 tz->mode = THERMAL_DEVICE_DISABLED;
987 for (i = i - 1; i >= 0; i--) {
988 struct __thermal_bind_params *tbp = tz->tbps + i;
991 for (j = 0; j < tbp->count; j++)
992 of_node_put(tbp->tcbp[j].cooling_device);
999 for (i = 0; i < tz->ntrips; i++)
1000 of_node_put(tz->trips[i].np);
1002 of_node_put(gchild);
1007 return ERR_PTR(ret);
1010 static __init void of_thermal_free_zone(struct __thermal_zone *tz)
1012 struct __thermal_bind_params *tbp;
1015 for (i = 0; i < tz->num_tbps; i++) {
1018 for (j = 0; j < tbp->count; j++)
1019 of_node_put(tbp->tcbp[j].cooling_device);
1025 for (i = 0; i < tz->ntrips; i++)
1026 of_node_put(tz->trips[i].np);
1032 * of_thermal_destroy_zones - remove all zones parsed and allocated resources
1034 * Finds all zones parsed and added to the thermal framework and remove them
1035 * from the system, together with their resources.
1038 static __init void of_thermal_destroy_zones(void)
1040 struct device_node *np, *child;
1042 np = of_find_node_by_name(NULL, "thermal-zones");
1044 pr_debug("unable to find thermal zones\n");
1048 for_each_available_child_of_node(np, child) {
1049 struct thermal_zone_device *zone;
1051 zone = thermal_zone_get_zone_by_name(child->name);
1055 thermal_zone_device_unregister(zone);
1058 of_thermal_free_zone(zone->devdata);
1064 * of_parse_thermal_zones - parse device tree thermal data
1066 * Initialization function that can be called by machine initialization
1067 * code to parse thermal data and populate the thermal framework
1068 * with hardware thermal zones info. This function only parses thermal zones.
1069 * Cooling devices and sensor devices nodes are supposed to be parsed
1070 * by their respective drivers.
1072 * Return: 0 on success, proper error code otherwise
1075 int __init of_parse_thermal_zones(void)
1077 struct device_node *np, *child;
1078 struct __thermal_zone *tz;
1079 struct thermal_zone_device_ops *ops;
1081 np = of_find_node_by_name(NULL, "thermal-zones");
1083 pr_debug("unable to find thermal zones\n");
1084 return 0; /* Run successfully on systems without thermal DT */
1087 for_each_available_child_of_node(np, child) {
1088 struct thermal_zone_device *zone;
1089 struct thermal_zone_params *tzp;
1093 tz = thermal_of_build_thermal_zone(child);
1095 pr_err("failed to build thermal zone %pOFn: %ld\n",
1101 ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
1105 tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
1111 /* No hwmon because there might be hwmon drivers registering */
1112 tzp->no_hwmon = true;
1114 if (!of_property_read_u32(child, "sustainable-power", &prop))
1115 tzp->sustainable_power = prop;
1117 for (i = 0; i < tz->ntrips; i++)
1120 /* these two are left for temperature drivers to use */
1121 tzp->slope = tz->slope;
1122 tzp->offset = tz->offset;
1124 zone = thermal_zone_device_register(child->name, tz->ntrips,
1130 pr_err("Failed to build %pOFn zone %ld\n", child,
1134 of_thermal_free_zone(tz);
1135 /* attempting to build remaining zones still */
1145 of_thermal_free_zone(tz);
1147 /* no memory available, so free what we have built */
1148 of_thermal_destroy_zones();