2 * of-thermal.c - Generic Thermal Management device tree support.
4 * Copyright (C) 2013 Texas Instruments
5 * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/thermal.h>
26 #include <linux/slab.h>
27 #include <linux/types.h>
28 #include <linux/of_device.h>
29 #include <linux/of_platform.h>
30 #include <linux/err.h>
31 #include <linux/export.h>
32 #include <linux/string.h>
33 #include <linux/thermal.h>
35 #include "thermal_core.h"
37 /*** Private data structures to represent thermal device tree data ***/
40 * struct __thermal_bind_param - a match between trip and cooling device
41 * @cooling_device: a pointer to identify the referred cooling device
42 * @trip_id: the trip point index
43 * @usage: the percentage (from 0 to 100) of cooling contribution
44 * @min: minimum cooling state used at this trip point
45 * @max: maximum cooling state used at this trip point
48 struct __thermal_bind_params {
49 struct device_node *cooling_device;
57 * struct __thermal_zone - internal representation of a thermal zone
58 * @mode: current thermal zone device mode (enabled/disabled)
59 * @passive_delay: polling interval while passive cooling is activated
60 * @polling_delay: zone polling interval
61 * @slope: slope of the temperature adjustment curve
62 * @offset: offset of the temperature adjustment curve
63 * @ntrips: number of trip points
64 * @trips: an array of trip points (0..ntrips - 1)
65 * @num_tbps: number of thermal bind params
66 * @tbps: an array of thermal bind params (0..num_tbps - 1)
67 * @sensor_data: sensor private data used while reading temperature and trend
68 * @ops: set of callbacks to handle the thermal zone based on DT
71 struct __thermal_zone {
72 enum thermal_device_mode mode;
80 struct thermal_trip *trips;
82 /* cooling binding data */
84 struct __thermal_bind_params *tbps;
86 /* sensor interface */
88 const struct thermal_zone_of_device_ops *ops;
91 /*** DT thermal zone device callbacks ***/
93 static int of_thermal_get_temp(struct thermal_zone_device *tz,
96 struct __thermal_zone *data = tz->devdata;
98 if (!data->ops->get_temp)
101 return data->ops->get_temp(data->sensor_data, temp);
105 * of_thermal_get_ntrips - function to export number of available trip
107 * @tz: pointer to a thermal zone
109 * This function is a globally visible wrapper to get number of trip points
110 * stored in the local struct __thermal_zone
112 * Return: number of available trip points, -ENODEV when data not available
114 int of_thermal_get_ntrips(struct thermal_zone_device *tz)
116 struct __thermal_zone *data = tz->devdata;
118 if (!data || IS_ERR(data))
123 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
126 * of_thermal_is_trip_valid - function to check if trip point is valid
128 * @tz: pointer to a thermal zone
129 * @trip: trip point to evaluate
131 * This function is responsible for checking if passed trip point is valid
133 * Return: true if trip point is valid, false otherwise
135 bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
137 struct __thermal_zone *data = tz->devdata;
139 if (!data || trip >= data->ntrips || trip < 0)
144 EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
147 * of_thermal_get_trip_points - function to get access to a globally exported
150 * @tz: pointer to a thermal zone
152 * This function provides a pointer to trip points table
154 * Return: pointer to trip points table, NULL otherwise
156 const struct thermal_trip *
157 of_thermal_get_trip_points(struct thermal_zone_device *tz)
159 struct __thermal_zone *data = tz->devdata;
166 EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
169 * of_thermal_set_emul_temp - function to set emulated temperature
171 * @tz: pointer to a thermal zone
172 * @temp: temperature to set
174 * This function gives the ability to set emulated value of temperature,
175 * which is handy for debugging
177 * Return: zero on success, error code otherwise
179 static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
182 struct __thermal_zone *data = tz->devdata;
184 if (!data->ops || !data->ops->set_emul_temp)
187 return data->ops->set_emul_temp(data->sensor_data, temp);
190 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
191 enum thermal_trend *trend)
193 struct __thermal_zone *data = tz->devdata;
197 if (!data->ops->get_trend)
200 r = data->ops->get_trend(data->sensor_data, &dev_trend);
204 /* TODO: These intervals might have some thresholds, but in core code */
206 *trend = THERMAL_TREND_RAISING;
207 else if (dev_trend < 0)
208 *trend = THERMAL_TREND_DROPPING;
210 *trend = THERMAL_TREND_STABLE;
215 static int of_thermal_bind(struct thermal_zone_device *thermal,
216 struct thermal_cooling_device *cdev)
218 struct __thermal_zone *data = thermal->devdata;
221 if (!data || IS_ERR(data))
224 /* find where to bind */
225 for (i = 0; i < data->num_tbps; i++) {
226 struct __thermal_bind_params *tbp = data->tbps + i;
228 if (tbp->cooling_device == cdev->np) {
231 ret = thermal_zone_bind_cooling_device(thermal,
244 static int of_thermal_unbind(struct thermal_zone_device *thermal,
245 struct thermal_cooling_device *cdev)
247 struct __thermal_zone *data = thermal->devdata;
250 if (!data || IS_ERR(data))
253 /* find where to unbind */
254 for (i = 0; i < data->num_tbps; i++) {
255 struct __thermal_bind_params *tbp = data->tbps + i;
257 if (tbp->cooling_device == cdev->np) {
260 ret = thermal_zone_unbind_cooling_device(thermal,
270 static int of_thermal_get_mode(struct thermal_zone_device *tz,
271 enum thermal_device_mode *mode)
273 struct __thermal_zone *data = tz->devdata;
280 static int of_thermal_set_mode(struct thermal_zone_device *tz,
281 enum thermal_device_mode mode)
283 struct __thermal_zone *data = tz->devdata;
285 mutex_lock(&tz->lock);
287 if (mode == THERMAL_DEVICE_ENABLED)
288 tz->polling_delay = data->polling_delay;
290 tz->polling_delay = 0;
292 mutex_unlock(&tz->lock);
295 thermal_zone_device_update(tz);
300 static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
301 enum thermal_trip_type *type)
303 struct __thermal_zone *data = tz->devdata;
305 if (trip >= data->ntrips || trip < 0)
308 *type = data->trips[trip].type;
313 static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
316 struct __thermal_zone *data = tz->devdata;
318 if (trip >= data->ntrips || trip < 0)
321 *temp = data->trips[trip].temperature;
326 static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
329 struct __thermal_zone *data = tz->devdata;
331 if (trip >= data->ntrips || trip < 0)
334 /* thermal framework should take care of data->mask & (1 << trip) */
335 data->trips[trip].temperature = temp;
340 static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
343 struct __thermal_zone *data = tz->devdata;
345 if (trip >= data->ntrips || trip < 0)
348 *hyst = data->trips[trip].hysteresis;
353 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
356 struct __thermal_zone *data = tz->devdata;
358 if (trip >= data->ntrips || trip < 0)
361 /* thermal framework should take care of data->mask & (1 << trip) */
362 data->trips[trip].hysteresis = hyst;
367 static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
370 struct __thermal_zone *data = tz->devdata;
373 for (i = 0; i < data->ntrips; i++)
374 if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
375 *temp = data->trips[i].temperature;
382 static struct thermal_zone_device_ops of_thermal_ops = {
383 .get_mode = of_thermal_get_mode,
384 .set_mode = of_thermal_set_mode,
386 .get_trip_type = of_thermal_get_trip_type,
387 .get_trip_temp = of_thermal_get_trip_temp,
388 .set_trip_temp = of_thermal_set_trip_temp,
389 .get_trip_hyst = of_thermal_get_trip_hyst,
390 .set_trip_hyst = of_thermal_set_trip_hyst,
391 .get_crit_temp = of_thermal_get_crit_temp,
393 .bind = of_thermal_bind,
394 .unbind = of_thermal_unbind,
399 static struct thermal_zone_device *
400 thermal_zone_of_add_sensor(struct device_node *zone,
401 struct device_node *sensor, void *data,
402 const struct thermal_zone_of_device_ops *ops)
404 struct thermal_zone_device *tzd;
405 struct __thermal_zone *tz;
407 tzd = thermal_zone_get_zone_by_name(zone->name);
409 return ERR_PTR(-EPROBE_DEFER);
414 return ERR_PTR(-EINVAL);
416 mutex_lock(&tzd->lock);
418 tz->sensor_data = data;
420 tzd->ops->get_temp = of_thermal_get_temp;
421 tzd->ops->get_trend = of_thermal_get_trend;
422 tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
423 mutex_unlock(&tzd->lock);
429 * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
430 * @dev: a valid struct device pointer of a sensor device. Must contain
431 * a valid .of_node, for the sensor node.
432 * @sensor_id: a sensor identifier, in case the sensor IP has more
434 * @data: a private pointer (owned by the caller) that will be passed
435 * back, when a temperature reading is needed.
436 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
438 * This function will search the list of thermal zones described in device
439 * tree and look for the zone that refer to the sensor device pointed by
440 * @dev->of_node as temperature providers. For the zone pointing to the
441 * sensor node, the sensor will be added to the DT thermal zone device.
443 * The thermal zone temperature is provided by the @get_temp function
444 * pointer. When called, it will have the private pointer @data back.
446 * The thermal zone temperature trend is provided by the @get_trend function
447 * pointer. When called, it will have the private pointer @data back.
450 * 01 - This function must enqueue the new sensor instead of using
451 * it as the only source of temperature values.
453 * 02 - There must be a way to match the sensor with all thermal zones
456 * Return: On success returns a valid struct thermal_zone_device,
457 * otherwise, it returns a corresponding ERR_PTR(). Caller must
458 * check the return value with help of IS_ERR() helper.
460 struct thermal_zone_device *
461 thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
462 const struct thermal_zone_of_device_ops *ops)
464 struct device_node *np, *child, *sensor_np;
465 struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
467 np = of_find_node_by_name(NULL, "thermal-zones");
469 return ERR_PTR(-ENODEV);
471 if (!dev || !dev->of_node) {
473 return ERR_PTR(-EINVAL);
476 sensor_np = of_node_get(dev->of_node);
478 for_each_child_of_node(np, child) {
479 struct of_phandle_args sensor_specs;
482 /* Check whether child is enabled or not */
483 if (!of_device_is_available(child))
486 /* For now, thermal framework supports only 1 sensor per zone */
487 ret = of_parse_phandle_with_args(child, "thermal-sensors",
488 "#thermal-sensor-cells",
493 if (sensor_specs.args_count >= 1) {
494 id = sensor_specs.args[0];
495 WARN(sensor_specs.args_count > 1,
496 "%s: too many cells in sensor specifier %d\n",
497 sensor_specs.np->name, sensor_specs.args_count);
502 if (sensor_specs.np == sensor_np && id == sensor_id) {
503 tzd = thermal_zone_of_add_sensor(child, sensor_np,
506 tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
508 of_node_put(sensor_specs.np);
512 of_node_put(sensor_specs.np);
515 of_node_put(sensor_np);
520 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
523 * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone
524 * @dev: a valid struct device pointer of a sensor device. Must contain
525 * a valid .of_node, for the sensor node.
526 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
528 * This function removes the sensor callbacks and private data from the
529 * thermal zone device registered with thermal_zone_of_sensor_register()
530 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
531 * thermal zone device callbacks.
533 * TODO: When the support to several sensors per zone is added, this
534 * function must search the sensor list based on @dev parameter.
537 void thermal_zone_of_sensor_unregister(struct device *dev,
538 struct thermal_zone_device *tzd)
540 struct __thermal_zone *tz;
542 if (!dev || !tzd || !tzd->devdata)
547 /* no __thermal_zone, nothing to be done */
551 mutex_lock(&tzd->lock);
552 tzd->ops->get_temp = NULL;
553 tzd->ops->get_trend = NULL;
554 tzd->ops->set_emul_temp = NULL;
557 tz->sensor_data = NULL;
558 mutex_unlock(&tzd->lock);
560 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
562 static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
564 thermal_zone_of_sensor_unregister(dev,
565 *(struct thermal_zone_device **)res);
568 static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
571 struct thermal_zone_device **r = res;
573 if (WARN_ON(!r || !*r))
580 * devm_thermal_zone_of_sensor_register - Resource managed version of
581 * thermal_zone_of_sensor_register()
582 * @dev: a valid struct device pointer of a sensor device. Must contain
583 * a valid .of_node, for the sensor node.
584 * @sensor_id: a sensor identifier, in case the sensor IP has more
586 * @data: a private pointer (owned by the caller) that will be passed
587 * back, when a temperature reading is needed.
588 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
590 * Refer thermal_zone_of_sensor_register() for more details.
592 * Return: On success returns a valid struct thermal_zone_device,
593 * otherwise, it returns a corresponding ERR_PTR(). Caller must
594 * check the return value with help of IS_ERR() helper.
595 * Registered hermal_zone_device device will automatically be
596 * released when device is unbounded.
598 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
599 struct device *dev, int sensor_id,
600 void *data, const struct thermal_zone_of_device_ops *ops)
602 struct thermal_zone_device **ptr, *tzd;
604 ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
607 return ERR_PTR(-ENOMEM);
609 tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
616 devres_add(dev, ptr);
620 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
623 * devm_thermal_zone_of_sensor_unregister - Resource managed version of
624 * thermal_zone_of_sensor_unregister().
625 * @dev: Device for which which resource was allocated.
626 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
628 * This function removes the sensor callbacks and private data from the
629 * thermal zone device registered with devm_thermal_zone_of_sensor_register()
630 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
631 * thermal zone device callbacks.
632 * Normally this function will not need to be called and the resource
633 * management code will ensure that the resource is freed.
635 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
636 struct thermal_zone_device *tzd)
638 WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
639 devm_thermal_zone_of_sensor_match, tzd));
641 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
643 /*** functions parsing device tree nodes ***/
646 * thermal_of_populate_bind_params - parse and fill cooling map data
647 * @np: DT node containing a cooling-map node
648 * @__tbp: data structure to be filled with cooling map info
649 * @trips: array of thermal zone trip points
650 * @ntrips: number of trip points inside trips.
652 * This function parses a cooling-map type of node represented by
653 * @np parameter and fills the read data into @__tbp data structure.
654 * It needs the already parsed array of trip points of the thermal zone
657 * Return: 0 on success, proper error code otherwise
659 static int thermal_of_populate_bind_params(struct device_node *np,
660 struct __thermal_bind_params *__tbp,
661 struct thermal_trip *trips,
664 struct of_phandle_args cooling_spec;
665 struct device_node *trip;
669 /* Default weight. Usage is optional */
670 __tbp->usage = THERMAL_WEIGHT_DEFAULT;
671 ret = of_property_read_u32(np, "contribution", &prop);
675 trip = of_parse_phandle(np, "trip", 0);
677 pr_err("missing trip property\n");
681 /* match using device_node */
682 for (i = 0; i < ntrips; i++)
683 if (trip == trips[i].np) {
693 ret = of_parse_phandle_with_args(np, "cooling-device", "#cooling-cells",
696 pr_err("missing cooling_device property\n");
699 __tbp->cooling_device = cooling_spec.np;
700 if (cooling_spec.args_count >= 2) { /* at least min and max */
701 __tbp->min = cooling_spec.args[0];
702 __tbp->max = cooling_spec.args[1];
704 pr_err("wrong reference to cooling device, missing limits\n");
714 * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
715 * into the device tree binding of 'trip', property type.
717 static const char * const trip_types[] = {
718 [THERMAL_TRIP_ACTIVE] = "active",
719 [THERMAL_TRIP_PASSIVE] = "passive",
720 [THERMAL_TRIP_HOT] = "hot",
721 [THERMAL_TRIP_CRITICAL] = "critical",
725 * thermal_of_get_trip_type - Get phy mode for given device_node
726 * @np: Pointer to the given device_node
727 * @type: Pointer to resulting trip type
729 * The function gets trip type string from property 'type',
730 * and store its index in trip_types table in @type,
732 * Return: 0 on success, or errno in error case.
734 static int thermal_of_get_trip_type(struct device_node *np,
735 enum thermal_trip_type *type)
740 err = of_property_read_string(np, "type", &t);
744 for (i = 0; i < ARRAY_SIZE(trip_types); i++)
745 if (!strcasecmp(t, trip_types[i])) {
754 * thermal_of_populate_trip - parse and fill one trip point data
755 * @np: DT node containing a trip point node
756 * @trip: trip point data structure to be filled up
758 * This function parses a trip point type of node represented by
759 * @np parameter and fills the read data into @trip data structure.
761 * Return: 0 on success, proper error code otherwise
763 static int thermal_of_populate_trip(struct device_node *np,
764 struct thermal_trip *trip)
769 ret = of_property_read_u32(np, "temperature", &prop);
771 pr_err("missing temperature property\n");
774 trip->temperature = prop;
776 ret = of_property_read_u32(np, "hysteresis", &prop);
778 pr_err("missing hysteresis property\n");
781 trip->hysteresis = prop;
783 ret = thermal_of_get_trip_type(np, &trip->type);
785 pr_err("wrong trip type property\n");
789 /* Required for cooling map matching */
797 * thermal_of_build_thermal_zone - parse and fill one thermal zone data
798 * @np: DT node containing a thermal zone node
800 * This function parses a thermal zone type of node represented by
801 * @np parameter and fills the read data into a __thermal_zone data structure
802 * and return this pointer.
804 * TODO: Missing properties to parse: thermal-sensor-names
806 * Return: On success returns a valid struct __thermal_zone,
807 * otherwise, it returns a corresponding ERR_PTR(). Caller must
808 * check the return value with help of IS_ERR() helper.
810 static struct __thermal_zone *
811 thermal_of_build_thermal_zone(struct device_node *np)
813 struct device_node *child = NULL, *gchild;
814 struct __thermal_zone *tz;
819 pr_err("no thermal zone np\n");
820 return ERR_PTR(-EINVAL);
823 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
825 return ERR_PTR(-ENOMEM);
827 ret = of_property_read_u32(np, "polling-delay-passive", &prop);
829 pr_err("missing polling-delay-passive property\n");
832 tz->passive_delay = prop;
834 ret = of_property_read_u32(np, "polling-delay", &prop);
836 pr_err("missing polling-delay property\n");
839 tz->polling_delay = prop;
842 * REVIST: for now, the thermal framework supports only
843 * one sensor per thermal zone. Thus, we are considering
844 * only the first two values as slope and offset.
846 ret = of_property_read_u32_array(np, "coefficients", coef, 2);
849 tz->offset = coef[1];
856 child = of_get_child_by_name(np, "trips");
858 /* No trips provided */
862 tz->ntrips = of_get_child_count(child);
863 if (tz->ntrips == 0) /* must have at least one child */
866 tz->trips = kzalloc(tz->ntrips * sizeof(*tz->trips), GFP_KERNEL);
873 for_each_child_of_node(child, gchild) {
874 ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
882 child = of_get_child_by_name(np, "cooling-maps");
884 /* cooling-maps not provided */
888 tz->num_tbps = of_get_child_count(child);
889 if (tz->num_tbps == 0)
892 tz->tbps = kzalloc(tz->num_tbps * sizeof(*tz->tbps), GFP_KERNEL);
899 for_each_child_of_node(child, gchild) {
900 ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
901 tz->trips, tz->ntrips);
908 tz->mode = THERMAL_DEVICE_DISABLED;
913 for (i = 0; i < tz->num_tbps; i++)
914 of_node_put(tz->tbps[i].cooling_device);
917 for (i = 0; i < tz->ntrips; i++)
918 of_node_put(tz->trips[i].np);
928 static inline void of_thermal_free_zone(struct __thermal_zone *tz)
932 for (i = 0; i < tz->num_tbps; i++)
933 of_node_put(tz->tbps[i].cooling_device);
935 for (i = 0; i < tz->ntrips; i++)
936 of_node_put(tz->trips[i].np);
942 * of_parse_thermal_zones - parse device tree thermal data
944 * Initialization function that can be called by machine initialization
945 * code to parse thermal data and populate the thermal framework
946 * with hardware thermal zones info. This function only parses thermal zones.
947 * Cooling devices and sensor devices nodes are supposed to be parsed
948 * by their respective drivers.
950 * Return: 0 on success, proper error code otherwise
953 int __init of_parse_thermal_zones(void)
955 struct device_node *np, *child;
956 struct __thermal_zone *tz;
957 struct thermal_zone_device_ops *ops;
959 np = of_find_node_by_name(NULL, "thermal-zones");
961 pr_debug("unable to find thermal zones\n");
962 return 0; /* Run successfully on systems without thermal DT */
965 for_each_child_of_node(np, child) {
966 struct thermal_zone_device *zone;
967 struct thermal_zone_params *tzp;
971 /* Check whether child is enabled or not */
972 if (!of_device_is_available(child))
975 tz = thermal_of_build_thermal_zone(child);
977 pr_err("failed to build thermal zone %s: %ld\n",
983 ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
987 tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
993 /* No hwmon because there might be hwmon drivers registering */
994 tzp->no_hwmon = true;
996 if (!of_property_read_u32(child, "sustainable-power", &prop))
997 tzp->sustainable_power = prop;
999 for (i = 0; i < tz->ntrips; i++)
1002 /* these two are left for temperature drivers to use */
1003 tzp->slope = tz->slope;
1004 tzp->offset = tz->offset;
1006 zone = thermal_zone_device_register(child->name, tz->ntrips,
1012 pr_err("Failed to build %s zone %ld\n", child->name,
1016 of_thermal_free_zone(tz);
1017 /* attempting to build remaining zones still */
1027 of_thermal_free_zone(tz);
1029 /* no memory available, so free what we have built */
1030 of_thermal_destroy_zones();
1036 * of_thermal_destroy_zones - remove all zones parsed and allocated resources
1038 * Finds all zones parsed and added to the thermal framework and remove them
1039 * from the system, together with their resources.
1042 void of_thermal_destroy_zones(void)
1044 struct device_node *np, *child;
1046 np = of_find_node_by_name(NULL, "thermal-zones");
1048 pr_debug("unable to find thermal zones\n");
1052 for_each_child_of_node(np, child) {
1053 struct thermal_zone_device *zone;
1055 /* Check whether child is enabled or not */
1056 if (!of_device_is_available(child))
1059 zone = thermal_zone_get_zone_by_name(child->name);
1063 thermal_zone_device_unregister(zone);
1066 of_thermal_free_zone(zone->devdata);