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);
104 static int of_thermal_set_trips(struct thermal_zone_device *tz,
107 struct __thermal_zone *data = tz->devdata;
109 if (!data->ops || !data->ops->set_trips)
112 return data->ops->set_trips(data->sensor_data, low, high);
116 * of_thermal_get_ntrips - function to export number of available trip
118 * @tz: pointer to a thermal zone
120 * This function is a globally visible wrapper to get number of trip points
121 * stored in the local struct __thermal_zone
123 * Return: number of available trip points, -ENODEV when data not available
125 int of_thermal_get_ntrips(struct thermal_zone_device *tz)
127 struct __thermal_zone *data = tz->devdata;
129 if (!data || IS_ERR(data))
134 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
137 * of_thermal_is_trip_valid - function to check if trip point is valid
139 * @tz: pointer to a thermal zone
140 * @trip: trip point to evaluate
142 * This function is responsible for checking if passed trip point is valid
144 * Return: true if trip point is valid, false otherwise
146 bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
148 struct __thermal_zone *data = tz->devdata;
150 if (!data || trip >= data->ntrips || trip < 0)
155 EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
158 * of_thermal_get_trip_points - function to get access to a globally exported
161 * @tz: pointer to a thermal zone
163 * This function provides a pointer to trip points table
165 * Return: pointer to trip points table, NULL otherwise
167 const struct thermal_trip *
168 of_thermal_get_trip_points(struct thermal_zone_device *tz)
170 struct __thermal_zone *data = tz->devdata;
177 EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
180 * of_thermal_set_emul_temp - function to set emulated temperature
182 * @tz: pointer to a thermal zone
183 * @temp: temperature to set
185 * This function gives the ability to set emulated value of temperature,
186 * which is handy for debugging
188 * Return: zero on success, error code otherwise
190 static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
193 struct __thermal_zone *data = tz->devdata;
195 if (!data->ops || !data->ops->set_emul_temp)
198 return data->ops->set_emul_temp(data->sensor_data, temp);
201 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
202 enum thermal_trend *trend)
204 struct __thermal_zone *data = tz->devdata;
208 if (!data->ops->get_trend)
211 r = data->ops->get_trend(data->sensor_data, &dev_trend);
215 /* TODO: These intervals might have some thresholds, but in core code */
217 *trend = THERMAL_TREND_RAISING;
218 else if (dev_trend < 0)
219 *trend = THERMAL_TREND_DROPPING;
221 *trend = THERMAL_TREND_STABLE;
226 static int of_thermal_bind(struct thermal_zone_device *thermal,
227 struct thermal_cooling_device *cdev)
229 struct __thermal_zone *data = thermal->devdata;
232 if (!data || IS_ERR(data))
235 /* find where to bind */
236 for (i = 0; i < data->num_tbps; i++) {
237 struct __thermal_bind_params *tbp = data->tbps + i;
239 if (tbp->cooling_device == cdev->np) {
242 ret = thermal_zone_bind_cooling_device(thermal,
255 static int of_thermal_unbind(struct thermal_zone_device *thermal,
256 struct thermal_cooling_device *cdev)
258 struct __thermal_zone *data = thermal->devdata;
261 if (!data || IS_ERR(data))
264 /* find where to unbind */
265 for (i = 0; i < data->num_tbps; i++) {
266 struct __thermal_bind_params *tbp = data->tbps + i;
268 if (tbp->cooling_device == cdev->np) {
271 ret = thermal_zone_unbind_cooling_device(thermal,
281 static int of_thermal_get_mode(struct thermal_zone_device *tz,
282 enum thermal_device_mode *mode)
284 struct __thermal_zone *data = tz->devdata;
291 static int of_thermal_set_mode(struct thermal_zone_device *tz,
292 enum thermal_device_mode mode)
294 struct __thermal_zone *data = tz->devdata;
296 mutex_lock(&tz->lock);
298 if (mode == THERMAL_DEVICE_ENABLED)
299 tz->polling_delay = data->polling_delay;
301 tz->polling_delay = 0;
303 mutex_unlock(&tz->lock);
306 thermal_zone_device_update(tz);
311 static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
312 enum thermal_trip_type *type)
314 struct __thermal_zone *data = tz->devdata;
316 if (trip >= data->ntrips || trip < 0)
319 *type = data->trips[trip].type;
324 static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
327 struct __thermal_zone *data = tz->devdata;
329 if (trip >= data->ntrips || trip < 0)
332 *temp = data->trips[trip].temperature;
337 static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
340 struct __thermal_zone *data = tz->devdata;
342 if (trip >= data->ntrips || trip < 0)
345 if (data->ops->set_trip_temp) {
348 ret = data->ops->set_trip_temp(data->sensor_data, trip, temp);
353 /* thermal framework should take care of data->mask & (1 << trip) */
354 data->trips[trip].temperature = temp;
359 static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
362 struct __thermal_zone *data = tz->devdata;
364 if (trip >= data->ntrips || trip < 0)
367 *hyst = data->trips[trip].hysteresis;
372 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
375 struct __thermal_zone *data = tz->devdata;
377 if (trip >= data->ntrips || trip < 0)
380 /* thermal framework should take care of data->mask & (1 << trip) */
381 data->trips[trip].hysteresis = hyst;
386 static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
389 struct __thermal_zone *data = tz->devdata;
392 for (i = 0; i < data->ntrips; i++)
393 if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
394 *temp = data->trips[i].temperature;
401 static struct thermal_zone_device_ops of_thermal_ops = {
402 .get_mode = of_thermal_get_mode,
403 .set_mode = of_thermal_set_mode,
405 .get_trip_type = of_thermal_get_trip_type,
406 .get_trip_temp = of_thermal_get_trip_temp,
407 .set_trip_temp = of_thermal_set_trip_temp,
408 .get_trip_hyst = of_thermal_get_trip_hyst,
409 .set_trip_hyst = of_thermal_set_trip_hyst,
410 .get_crit_temp = of_thermal_get_crit_temp,
412 .bind = of_thermal_bind,
413 .unbind = of_thermal_unbind,
418 static struct thermal_zone_device *
419 thermal_zone_of_add_sensor(struct device_node *zone,
420 struct device_node *sensor, void *data,
421 const struct thermal_zone_of_device_ops *ops)
423 struct thermal_zone_device *tzd;
424 struct __thermal_zone *tz;
426 tzd = thermal_zone_get_zone_by_name(zone->name);
428 return ERR_PTR(-EPROBE_DEFER);
433 return ERR_PTR(-EINVAL);
435 mutex_lock(&tzd->lock);
437 tz->sensor_data = data;
439 tzd->ops->get_temp = of_thermal_get_temp;
440 tzd->ops->get_trend = of_thermal_get_trend;
441 tzd->ops->set_trips = of_thermal_set_trips;
442 tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
443 mutex_unlock(&tzd->lock);
449 * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
450 * @dev: a valid struct device pointer of a sensor device. Must contain
451 * a valid .of_node, for the sensor node.
452 * @sensor_id: a sensor identifier, in case the sensor IP has more
454 * @data: a private pointer (owned by the caller) that will be passed
455 * back, when a temperature reading is needed.
456 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
458 * This function will search the list of thermal zones described in device
459 * tree and look for the zone that refer to the sensor device pointed by
460 * @dev->of_node as temperature providers. For the zone pointing to the
461 * sensor node, the sensor will be added to the DT thermal zone device.
463 * The thermal zone temperature is provided by the @get_temp function
464 * pointer. When called, it will have the private pointer @data back.
466 * The thermal zone temperature trend is provided by the @get_trend function
467 * pointer. When called, it will have the private pointer @data back.
470 * 01 - This function must enqueue the new sensor instead of using
471 * it as the only source of temperature values.
473 * 02 - There must be a way to match the sensor with all thermal zones
476 * Return: On success returns a valid struct thermal_zone_device,
477 * otherwise, it returns a corresponding ERR_PTR(). Caller must
478 * check the return value with help of IS_ERR() helper.
480 struct thermal_zone_device *
481 thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
482 const struct thermal_zone_of_device_ops *ops)
484 struct device_node *np, *child, *sensor_np;
485 struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
487 np = of_find_node_by_name(NULL, "thermal-zones");
489 return ERR_PTR(-ENODEV);
491 if (!dev || !dev->of_node) {
493 return ERR_PTR(-EINVAL);
496 sensor_np = of_node_get(dev->of_node);
498 for_each_child_of_node(np, child) {
499 struct of_phandle_args sensor_specs;
502 /* Check whether child is enabled or not */
503 if (!of_device_is_available(child))
506 /* For now, thermal framework supports only 1 sensor per zone */
507 ret = of_parse_phandle_with_args(child, "thermal-sensors",
508 "#thermal-sensor-cells",
513 if (sensor_specs.args_count >= 1) {
514 id = sensor_specs.args[0];
515 WARN(sensor_specs.args_count > 1,
516 "%s: too many cells in sensor specifier %d\n",
517 sensor_specs.np->name, sensor_specs.args_count);
522 if (sensor_specs.np == sensor_np && id == sensor_id) {
523 tzd = thermal_zone_of_add_sensor(child, sensor_np,
526 tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
528 of_node_put(sensor_specs.np);
532 of_node_put(sensor_specs.np);
535 of_node_put(sensor_np);
540 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
543 * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone
544 * @dev: a valid struct device pointer of a sensor device. Must contain
545 * a valid .of_node, for the sensor node.
546 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
548 * This function removes the sensor callbacks and private data from the
549 * thermal zone device registered with thermal_zone_of_sensor_register()
550 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
551 * thermal zone device callbacks.
553 * TODO: When the support to several sensors per zone is added, this
554 * function must search the sensor list based on @dev parameter.
557 void thermal_zone_of_sensor_unregister(struct device *dev,
558 struct thermal_zone_device *tzd)
560 struct __thermal_zone *tz;
562 if (!dev || !tzd || !tzd->devdata)
567 /* no __thermal_zone, nothing to be done */
571 mutex_lock(&tzd->lock);
572 tzd->ops->get_temp = NULL;
573 tzd->ops->get_trend = NULL;
574 tzd->ops->set_emul_temp = NULL;
577 tz->sensor_data = NULL;
578 mutex_unlock(&tzd->lock);
580 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
582 static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
584 thermal_zone_of_sensor_unregister(dev,
585 *(struct thermal_zone_device **)res);
588 static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
591 struct thermal_zone_device **r = res;
593 if (WARN_ON(!r || !*r))
600 * devm_thermal_zone_of_sensor_register - Resource managed version of
601 * thermal_zone_of_sensor_register()
602 * @dev: a valid struct device pointer of a sensor device. Must contain
603 * a valid .of_node, for the sensor node.
604 * @sensor_id: a sensor identifier, in case the sensor IP has more
606 * @data: a private pointer (owned by the caller) that will be passed
607 * back, when a temperature reading is needed.
608 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
610 * Refer thermal_zone_of_sensor_register() for more details.
612 * Return: On success returns a valid struct thermal_zone_device,
613 * otherwise, it returns a corresponding ERR_PTR(). Caller must
614 * check the return value with help of IS_ERR() helper.
615 * Registered hermal_zone_device device will automatically be
616 * released when device is unbounded.
618 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
619 struct device *dev, int sensor_id,
620 void *data, const struct thermal_zone_of_device_ops *ops)
622 struct thermal_zone_device **ptr, *tzd;
624 ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
627 return ERR_PTR(-ENOMEM);
629 tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
636 devres_add(dev, ptr);
640 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
643 * devm_thermal_zone_of_sensor_unregister - Resource managed version of
644 * thermal_zone_of_sensor_unregister().
645 * @dev: Device for which which resource was allocated.
646 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
648 * This function removes the sensor callbacks and private data from the
649 * thermal zone device registered with devm_thermal_zone_of_sensor_register()
650 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
651 * thermal zone device callbacks.
652 * Normally this function will not need to be called and the resource
653 * management code will ensure that the resource is freed.
655 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
656 struct thermal_zone_device *tzd)
658 WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
659 devm_thermal_zone_of_sensor_match, tzd));
661 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
663 /*** functions parsing device tree nodes ***/
666 * thermal_of_populate_bind_params - parse and fill cooling map data
667 * @np: DT node containing a cooling-map node
668 * @__tbp: data structure to be filled with cooling map info
669 * @trips: array of thermal zone trip points
670 * @ntrips: number of trip points inside trips.
672 * This function parses a cooling-map type of node represented by
673 * @np parameter and fills the read data into @__tbp data structure.
674 * It needs the already parsed array of trip points of the thermal zone
677 * Return: 0 on success, proper error code otherwise
679 static int thermal_of_populate_bind_params(struct device_node *np,
680 struct __thermal_bind_params *__tbp,
681 struct thermal_trip *trips,
684 struct of_phandle_args cooling_spec;
685 struct device_node *trip;
689 /* Default weight. Usage is optional */
690 __tbp->usage = THERMAL_WEIGHT_DEFAULT;
691 ret = of_property_read_u32(np, "contribution", &prop);
695 trip = of_parse_phandle(np, "trip", 0);
697 pr_err("missing trip property\n");
701 /* match using device_node */
702 for (i = 0; i < ntrips; i++)
703 if (trip == trips[i].np) {
713 ret = of_parse_phandle_with_args(np, "cooling-device", "#cooling-cells",
716 pr_err("missing cooling_device property\n");
719 __tbp->cooling_device = cooling_spec.np;
720 if (cooling_spec.args_count >= 2) { /* at least min and max */
721 __tbp->min = cooling_spec.args[0];
722 __tbp->max = cooling_spec.args[1];
724 pr_err("wrong reference to cooling device, missing limits\n");
734 * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
735 * into the device tree binding of 'trip', property type.
737 static const char * const trip_types[] = {
738 [THERMAL_TRIP_ACTIVE] = "active",
739 [THERMAL_TRIP_PASSIVE] = "passive",
740 [THERMAL_TRIP_HOT] = "hot",
741 [THERMAL_TRIP_CRITICAL] = "critical",
745 * thermal_of_get_trip_type - Get phy mode for given device_node
746 * @np: Pointer to the given device_node
747 * @type: Pointer to resulting trip type
749 * The function gets trip type string from property 'type',
750 * and store its index in trip_types table in @type,
752 * Return: 0 on success, or errno in error case.
754 static int thermal_of_get_trip_type(struct device_node *np,
755 enum thermal_trip_type *type)
760 err = of_property_read_string(np, "type", &t);
764 for (i = 0; i < ARRAY_SIZE(trip_types); i++)
765 if (!strcasecmp(t, trip_types[i])) {
774 * thermal_of_populate_trip - parse and fill one trip point data
775 * @np: DT node containing a trip point node
776 * @trip: trip point data structure to be filled up
778 * This function parses a trip point type of node represented by
779 * @np parameter and fills the read data into @trip data structure.
781 * Return: 0 on success, proper error code otherwise
783 static int thermal_of_populate_trip(struct device_node *np,
784 struct thermal_trip *trip)
789 ret = of_property_read_u32(np, "temperature", &prop);
791 pr_err("missing temperature property\n");
794 trip->temperature = prop;
796 ret = of_property_read_u32(np, "hysteresis", &prop);
798 pr_err("missing hysteresis property\n");
801 trip->hysteresis = prop;
803 ret = thermal_of_get_trip_type(np, &trip->type);
805 pr_err("wrong trip type property\n");
809 /* Required for cooling map matching */
817 * thermal_of_build_thermal_zone - parse and fill one thermal zone data
818 * @np: DT node containing a thermal zone node
820 * This function parses a thermal zone type of node represented by
821 * @np parameter and fills the read data into a __thermal_zone data structure
822 * and return this pointer.
824 * TODO: Missing properties to parse: thermal-sensor-names
826 * Return: On success returns a valid struct __thermal_zone,
827 * otherwise, it returns a corresponding ERR_PTR(). Caller must
828 * check the return value with help of IS_ERR() helper.
830 static struct __thermal_zone *
831 thermal_of_build_thermal_zone(struct device_node *np)
833 struct device_node *child = NULL, *gchild;
834 struct __thermal_zone *tz;
839 pr_err("no thermal zone np\n");
840 return ERR_PTR(-EINVAL);
843 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
845 return ERR_PTR(-ENOMEM);
847 ret = of_property_read_u32(np, "polling-delay-passive", &prop);
849 pr_err("missing polling-delay-passive property\n");
852 tz->passive_delay = prop;
854 ret = of_property_read_u32(np, "polling-delay", &prop);
856 pr_err("missing polling-delay property\n");
859 tz->polling_delay = prop;
862 * REVIST: for now, the thermal framework supports only
863 * one sensor per thermal zone. Thus, we are considering
864 * only the first two values as slope and offset.
866 ret = of_property_read_u32_array(np, "coefficients", coef, 2);
869 tz->offset = coef[1];
876 child = of_get_child_by_name(np, "trips");
878 /* No trips provided */
882 tz->ntrips = of_get_child_count(child);
883 if (tz->ntrips == 0) /* must have at least one child */
886 tz->trips = kzalloc(tz->ntrips * sizeof(*tz->trips), GFP_KERNEL);
893 for_each_child_of_node(child, gchild) {
894 ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
902 child = of_get_child_by_name(np, "cooling-maps");
904 /* cooling-maps not provided */
908 tz->num_tbps = of_get_child_count(child);
909 if (tz->num_tbps == 0)
912 tz->tbps = kzalloc(tz->num_tbps * sizeof(*tz->tbps), GFP_KERNEL);
919 for_each_child_of_node(child, gchild) {
920 ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
921 tz->trips, tz->ntrips);
928 tz->mode = THERMAL_DEVICE_DISABLED;
933 for (i = 0; i < tz->num_tbps; i++)
934 of_node_put(tz->tbps[i].cooling_device);
937 for (i = 0; i < tz->ntrips; i++)
938 of_node_put(tz->trips[i].np);
948 static inline void of_thermal_free_zone(struct __thermal_zone *tz)
952 for (i = 0; i < tz->num_tbps; i++)
953 of_node_put(tz->tbps[i].cooling_device);
955 for (i = 0; i < tz->ntrips; i++)
956 of_node_put(tz->trips[i].np);
962 * of_parse_thermal_zones - parse device tree thermal data
964 * Initialization function that can be called by machine initialization
965 * code to parse thermal data and populate the thermal framework
966 * with hardware thermal zones info. This function only parses thermal zones.
967 * Cooling devices and sensor devices nodes are supposed to be parsed
968 * by their respective drivers.
970 * Return: 0 on success, proper error code otherwise
973 int __init of_parse_thermal_zones(void)
975 struct device_node *np, *child;
976 struct __thermal_zone *tz;
977 struct thermal_zone_device_ops *ops;
979 np = of_find_node_by_name(NULL, "thermal-zones");
981 pr_debug("unable to find thermal zones\n");
982 return 0; /* Run successfully on systems without thermal DT */
985 for_each_child_of_node(np, child) {
986 struct thermal_zone_device *zone;
987 struct thermal_zone_params *tzp;
991 /* Check whether child is enabled or not */
992 if (!of_device_is_available(child))
995 tz = thermal_of_build_thermal_zone(child);
997 pr_err("failed to build thermal zone %s: %ld\n",
1003 ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
1007 tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
1013 /* No hwmon because there might be hwmon drivers registering */
1014 tzp->no_hwmon = true;
1016 if (!of_property_read_u32(child, "sustainable-power", &prop))
1017 tzp->sustainable_power = prop;
1019 for (i = 0; i < tz->ntrips; i++)
1022 /* these two are left for temperature drivers to use */
1023 tzp->slope = tz->slope;
1024 tzp->offset = tz->offset;
1026 zone = thermal_zone_device_register(child->name, tz->ntrips,
1032 pr_err("Failed to build %s zone %ld\n", child->name,
1036 of_thermal_free_zone(tz);
1037 /* attempting to build remaining zones still */
1047 of_thermal_free_zone(tz);
1049 /* no memory available, so free what we have built */
1050 of_thermal_destroy_zones();
1056 * of_thermal_destroy_zones - remove all zones parsed and allocated resources
1058 * Finds all zones parsed and added to the thermal framework and remove them
1059 * from the system, together with their resources.
1062 void of_thermal_destroy_zones(void)
1064 struct device_node *np, *child;
1066 np = of_find_node_by_name(NULL, "thermal-zones");
1068 pr_debug("unable to find thermal zones\n");
1072 for_each_child_of_node(np, child) {
1073 struct thermal_zone_device *zone;
1075 /* Check whether child is enabled or not */
1076 if (!of_device_is_available(child))
1079 zone = thermal_zone_get_zone_by_name(child->name);
1083 thermal_zone_device_unregister(zone);
1086 of_thermal_free_zone(zone->devdata);