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 * @passive_delay: polling interval while passive cooling is activated
55 * @polling_delay: zone polling interval
56 * @slope: slope of the temperature adjustment curve
57 * @offset: offset of the temperature adjustment curve
58 * @ntrips: number of trip points
59 * @trips: an array of trip points (0..ntrips - 1)
60 * @num_tbps: number of thermal bind params
61 * @tbps: an array of thermal bind params (0..num_tbps - 1)
62 * @sensor_data: sensor private data used while reading temperature and trend
63 * @ops: set of callbacks to handle the thermal zone based on DT
66 struct __thermal_zone {
74 struct thermal_trip *trips;
76 /* cooling binding data */
78 struct __thermal_bind_params *tbps;
80 /* sensor interface */
82 const struct thermal_zone_of_device_ops *ops;
85 /*** DT thermal zone device callbacks ***/
87 static int of_thermal_get_temp(struct thermal_zone_device *tz,
90 struct __thermal_zone *data = tz->devdata;
92 if (!data->ops->get_temp)
95 return data->ops->get_temp(data->sensor_data, temp);
98 static int of_thermal_set_trips(struct thermal_zone_device *tz,
101 struct __thermal_zone *data = tz->devdata;
103 if (!data->ops || !data->ops->set_trips)
106 return data->ops->set_trips(data->sensor_data, low, high);
110 * of_thermal_get_ntrips - function to export number of available trip
112 * @tz: pointer to a thermal zone
114 * This function is a globally visible wrapper to get number of trip points
115 * stored in the local struct __thermal_zone
117 * Return: number of available trip points, -ENODEV when data not available
119 int of_thermal_get_ntrips(struct thermal_zone_device *tz)
121 struct __thermal_zone *data = tz->devdata;
123 if (!data || IS_ERR(data))
128 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
131 * of_thermal_is_trip_valid - function to check if trip point is valid
133 * @tz: pointer to a thermal zone
134 * @trip: trip point to evaluate
136 * This function is responsible for checking if passed trip point is valid
138 * Return: true if trip point is valid, false otherwise
140 bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
142 struct __thermal_zone *data = tz->devdata;
144 if (!data || trip >= data->ntrips || trip < 0)
149 EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
152 * of_thermal_get_trip_points - function to get access to a globally exported
155 * @tz: pointer to a thermal zone
157 * This function provides a pointer to trip points table
159 * Return: pointer to trip points table, NULL otherwise
161 const struct thermal_trip *
162 of_thermal_get_trip_points(struct thermal_zone_device *tz)
164 struct __thermal_zone *data = tz->devdata;
171 EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
174 * of_thermal_set_emul_temp - function to set emulated temperature
176 * @tz: pointer to a thermal zone
177 * @temp: temperature to set
179 * This function gives the ability to set emulated value of temperature,
180 * which is handy for debugging
182 * Return: zero on success, error code otherwise
184 static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
187 struct __thermal_zone *data = tz->devdata;
189 return data->ops->set_emul_temp(data->sensor_data, temp);
192 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
193 enum thermal_trend *trend)
195 struct __thermal_zone *data = tz->devdata;
197 if (!data->ops->get_trend)
200 return data->ops->get_trend(data->sensor_data, trip, trend);
203 static int of_thermal_bind(struct thermal_zone_device *thermal,
204 struct thermal_cooling_device *cdev)
206 struct __thermal_zone *data = thermal->devdata;
207 struct __thermal_bind_params *tbp;
208 struct __thermal_cooling_bind_param *tcbp;
211 if (!data || IS_ERR(data))
214 /* find where to bind */
215 for (i = 0; i < data->num_tbps; i++) {
216 tbp = data->tbps + i;
218 for (j = 0; j < tbp->count; j++) {
219 tcbp = tbp->tcbp + j;
221 if (tcbp->cooling_device == cdev->np) {
224 ret = thermal_zone_bind_cooling_device(thermal,
238 static int of_thermal_unbind(struct thermal_zone_device *thermal,
239 struct thermal_cooling_device *cdev)
241 struct __thermal_zone *data = thermal->devdata;
242 struct __thermal_bind_params *tbp;
243 struct __thermal_cooling_bind_param *tcbp;
246 if (!data || IS_ERR(data))
249 /* find where to unbind */
250 for (i = 0; i < data->num_tbps; i++) {
251 tbp = data->tbps + i;
253 for (j = 0; j < tbp->count; j++) {
254 tcbp = tbp->tcbp + j;
256 if (tcbp->cooling_device == cdev->np) {
259 ret = thermal_zone_unbind_cooling_device(thermal,
270 static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
271 enum thermal_trip_type *type)
273 struct __thermal_zone *data = tz->devdata;
275 if (trip >= data->ntrips || trip < 0)
278 *type = data->trips[trip].type;
283 static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
286 struct __thermal_zone *data = tz->devdata;
288 if (trip >= data->ntrips || trip < 0)
291 *temp = data->trips[trip].temperature;
296 static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
299 struct __thermal_zone *data = tz->devdata;
301 if (trip >= data->ntrips || trip < 0)
304 if (data->ops->set_trip_temp) {
307 ret = data->ops->set_trip_temp(data->sensor_data, trip, temp);
312 /* thermal framework should take care of data->mask & (1 << trip) */
313 data->trips[trip].temperature = temp;
318 static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
321 struct __thermal_zone *data = tz->devdata;
323 if (trip >= data->ntrips || trip < 0)
326 *hyst = data->trips[trip].hysteresis;
331 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
334 struct __thermal_zone *data = tz->devdata;
336 if (trip >= data->ntrips || trip < 0)
339 /* thermal framework should take care of data->mask & (1 << trip) */
340 data->trips[trip].hysteresis = hyst;
345 static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
348 struct __thermal_zone *data = tz->devdata;
351 for (i = 0; i < data->ntrips; i++)
352 if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
353 *temp = data->trips[i].temperature;
360 static struct thermal_zone_device_ops of_thermal_ops = {
361 .get_trip_type = of_thermal_get_trip_type,
362 .get_trip_temp = of_thermal_get_trip_temp,
363 .set_trip_temp = of_thermal_set_trip_temp,
364 .get_trip_hyst = of_thermal_get_trip_hyst,
365 .set_trip_hyst = of_thermal_set_trip_hyst,
366 .get_crit_temp = of_thermal_get_crit_temp,
368 .bind = of_thermal_bind,
369 .unbind = of_thermal_unbind,
374 static struct thermal_zone_device *
375 thermal_zone_of_add_sensor(struct device_node *zone,
376 struct device_node *sensor, void *data,
377 const struct thermal_zone_of_device_ops *ops)
379 struct thermal_zone_device *tzd;
380 struct __thermal_zone *tz;
382 tzd = thermal_zone_get_zone_by_name(zone->name);
384 return ERR_PTR(-EPROBE_DEFER);
389 return ERR_PTR(-EINVAL);
391 mutex_lock(&tzd->lock);
393 tz->sensor_data = data;
395 tzd->ops->get_temp = of_thermal_get_temp;
396 tzd->ops->get_trend = of_thermal_get_trend;
399 * The thermal zone core will calculate the window if they have set the
400 * optional set_trips pointer.
403 tzd->ops->set_trips = of_thermal_set_trips;
405 if (ops->set_emul_temp)
406 tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
408 mutex_unlock(&tzd->lock);
414 * thermal_zone_of_get_sensor_id - get sensor ID from a DT thermal zone
415 * @tz_np: a valid thermal zone device node.
416 * @sensor_np: a sensor node of a valid sensor device.
417 * @id: the sensor ID returned if success.
419 * This function will get sensor ID from a given thermal zone node and
420 * the sensor node must match the temperature provider @sensor_np.
422 * Return: 0 on success, proper error code otherwise.
425 int thermal_zone_of_get_sensor_id(struct device_node *tz_np,
426 struct device_node *sensor_np,
429 struct of_phandle_args sensor_specs;
432 ret = of_parse_phandle_with_args(tz_np,
434 "#thermal-sensor-cells",
440 if (sensor_specs.np != sensor_np) {
441 of_node_put(sensor_specs.np);
445 if (sensor_specs.args_count > 1)
446 pr_warn("%pOFn: too many cells in sensor specifier %d\n",
447 sensor_specs.np, sensor_specs.args_count);
449 *id = sensor_specs.args_count ? sensor_specs.args[0] : 0;
451 of_node_put(sensor_specs.np);
455 EXPORT_SYMBOL_GPL(thermal_zone_of_get_sensor_id);
458 * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
459 * @dev: a valid struct device pointer of a sensor device. Must contain
460 * a valid .of_node, for the sensor node.
461 * @sensor_id: a sensor identifier, in case the sensor IP has more
463 * @data: a private pointer (owned by the caller) that will be passed
464 * back, when a temperature reading is needed.
465 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
467 * This function will search the list of thermal zones described in device
468 * tree and look for the zone that refer to the sensor device pointed by
469 * @dev->of_node as temperature providers. For the zone pointing to the
470 * sensor node, the sensor will be added to the DT thermal zone device.
472 * The thermal zone temperature is provided by the @get_temp function
473 * pointer. When called, it will have the private pointer @data back.
475 * The thermal zone temperature trend is provided by the @get_trend function
476 * pointer. When called, it will have the private pointer @data back.
479 * 01 - This function must enqueue the new sensor instead of using
480 * it as the only source of temperature values.
482 * 02 - There must be a way to match the sensor with all thermal zones
485 * Return: On success returns a valid struct thermal_zone_device,
486 * otherwise, it returns a corresponding ERR_PTR(). Caller must
487 * check the return value with help of IS_ERR() helper.
489 struct thermal_zone_device *
490 thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
491 const struct thermal_zone_of_device_ops *ops)
493 struct device_node *np, *child, *sensor_np;
494 struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
496 np = of_find_node_by_name(NULL, "thermal-zones");
498 return ERR_PTR(-ENODEV);
500 if (!dev || !dev->of_node) {
502 return ERR_PTR(-ENODEV);
505 sensor_np = of_node_get(dev->of_node);
507 for_each_available_child_of_node(np, child) {
510 /* For now, thermal framework supports only 1 sensor per zone */
511 ret = thermal_zone_of_get_sensor_id(child, sensor_np, &id);
515 if (id == sensor_id) {
516 tzd = thermal_zone_of_add_sensor(child, sensor_np,
519 thermal_zone_device_enable(tzd);
526 of_node_put(sensor_np);
531 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
534 * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone
535 * @dev: a valid struct device pointer of a sensor device. Must contain
536 * a valid .of_node, for the sensor node.
537 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
539 * This function removes the sensor callbacks and private data from the
540 * thermal zone device registered with thermal_zone_of_sensor_register()
541 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
542 * thermal zone device callbacks.
544 * TODO: When the support to several sensors per zone is added, this
545 * function must search the sensor list based on @dev parameter.
548 void thermal_zone_of_sensor_unregister(struct device *dev,
549 struct thermal_zone_device *tzd)
551 struct __thermal_zone *tz;
553 if (!dev || !tzd || !tzd->devdata)
558 /* no __thermal_zone, nothing to be done */
562 /* stop temperature polling */
563 thermal_zone_device_disable(tzd);
565 mutex_lock(&tzd->lock);
566 tzd->ops->get_temp = NULL;
567 tzd->ops->get_trend = NULL;
568 tzd->ops->set_emul_temp = NULL;
571 tz->sensor_data = NULL;
572 mutex_unlock(&tzd->lock);
574 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
576 static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
578 thermal_zone_of_sensor_unregister(dev,
579 *(struct thermal_zone_device **)res);
582 static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
585 struct thermal_zone_device **r = res;
587 if (WARN_ON(!r || !*r))
594 * devm_thermal_zone_of_sensor_register - Resource managed version of
595 * thermal_zone_of_sensor_register()
596 * @dev: a valid struct device pointer of a sensor device. Must contain
597 * a valid .of_node, for the sensor node.
598 * @sensor_id: a sensor identifier, in case the sensor IP has more
600 * @data: a private pointer (owned by the caller) that will be passed
601 * back, when a temperature reading is needed.
602 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
604 * Refer thermal_zone_of_sensor_register() for more details.
606 * Return: On success returns a valid struct thermal_zone_device,
607 * otherwise, it returns a corresponding ERR_PTR(). Caller must
608 * check the return value with help of IS_ERR() helper.
609 * Registered thermal_zone_device device will automatically be
610 * released when device is unbounded.
612 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
613 struct device *dev, int sensor_id,
614 void *data, const struct thermal_zone_of_device_ops *ops)
616 struct thermal_zone_device **ptr, *tzd;
618 ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
621 return ERR_PTR(-ENOMEM);
623 tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
630 devres_add(dev, ptr);
634 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
637 * devm_thermal_zone_of_sensor_unregister - Resource managed version of
638 * thermal_zone_of_sensor_unregister().
639 * @dev: Device for which which resource was allocated.
640 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
642 * This function removes the sensor callbacks and private data from the
643 * thermal zone device registered with devm_thermal_zone_of_sensor_register()
644 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
645 * thermal zone device callbacks.
646 * Normally this function will not need to be called and the resource
647 * management code will ensure that the resource is freed.
649 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
650 struct thermal_zone_device *tzd)
652 WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
653 devm_thermal_zone_of_sensor_match, tzd));
655 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
657 /*** functions parsing device tree nodes ***/
660 * thermal_of_populate_bind_params - parse and fill cooling map data
661 * @np: DT node containing a cooling-map node
662 * @__tbp: data structure to be filled with cooling map info
663 * @trips: array of thermal zone trip points
664 * @ntrips: number of trip points inside trips.
666 * This function parses a cooling-map type of node represented by
667 * @np parameter and fills the read data into @__tbp data structure.
668 * It needs the already parsed array of trip points of the thermal zone
671 * Return: 0 on success, proper error code otherwise
673 static int thermal_of_populate_bind_params(struct device_node *np,
674 struct __thermal_bind_params *__tbp,
675 struct thermal_trip *trips,
678 struct of_phandle_args cooling_spec;
679 struct __thermal_cooling_bind_param *__tcbp;
680 struct device_node *trip;
684 /* Default weight. Usage is optional */
685 __tbp->usage = THERMAL_WEIGHT_DEFAULT;
686 ret = of_property_read_u32(np, "contribution", &prop);
690 trip = of_parse_phandle(np, "trip", 0);
692 pr_err("missing trip property\n");
696 /* match using device_node */
697 for (i = 0; i < ntrips; i++)
698 if (trip == trips[i].np) {
708 count = of_count_phandle_with_args(np, "cooling-device",
711 pr_err("Add a cooling_device property with at least one device\n");
716 __tcbp = kcalloc(count, sizeof(*__tcbp), GFP_KERNEL);
722 for (i = 0; i < count; i++) {
723 ret = of_parse_phandle_with_args(np, "cooling-device",
724 "#cooling-cells", i, &cooling_spec);
726 pr_err("Invalid cooling-device entry\n");
730 __tcbp[i].cooling_device = cooling_spec.np;
732 if (cooling_spec.args_count >= 2) { /* at least min and max */
733 __tcbp[i].min = cooling_spec.args[0];
734 __tcbp[i].max = cooling_spec.args[1];
736 pr_err("wrong reference to cooling device, missing limits\n");
740 __tbp->tcbp = __tcbp;
741 __tbp->count = count;
746 for (i = i - 1; i >= 0; i--)
747 of_node_put(__tcbp[i].cooling_device);
756 * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
757 * into the device tree binding of 'trip', property type.
759 static const char * const trip_types[] = {
760 [THERMAL_TRIP_ACTIVE] = "active",
761 [THERMAL_TRIP_PASSIVE] = "passive",
762 [THERMAL_TRIP_HOT] = "hot",
763 [THERMAL_TRIP_CRITICAL] = "critical",
767 * thermal_of_get_trip_type - Get phy mode for given device_node
768 * @np: Pointer to the given device_node
769 * @type: Pointer to resulting trip type
771 * The function gets trip type string from property 'type',
772 * and store its index in trip_types table in @type,
774 * Return: 0 on success, or errno in error case.
776 static int thermal_of_get_trip_type(struct device_node *np,
777 enum thermal_trip_type *type)
782 err = of_property_read_string(np, "type", &t);
786 for (i = 0; i < ARRAY_SIZE(trip_types); i++)
787 if (!strcasecmp(t, trip_types[i])) {
796 * thermal_of_populate_trip - parse and fill one trip point data
797 * @np: DT node containing a trip point node
798 * @trip: trip point data structure to be filled up
800 * This function parses a trip point type of node represented by
801 * @np parameter and fills the read data into @trip data structure.
803 * Return: 0 on success, proper error code otherwise
805 static int thermal_of_populate_trip(struct device_node *np,
806 struct thermal_trip *trip)
811 ret = of_property_read_u32(np, "temperature", &prop);
813 pr_err("missing temperature property\n");
816 trip->temperature = prop;
818 ret = of_property_read_u32(np, "hysteresis", &prop);
820 pr_err("missing hysteresis property\n");
823 trip->hysteresis = prop;
825 ret = thermal_of_get_trip_type(np, &trip->type);
827 pr_err("wrong trip type property\n");
831 /* Required for cooling map matching */
839 * thermal_of_build_thermal_zone - parse and fill one thermal zone data
840 * @np: DT node containing a thermal zone node
842 * This function parses a thermal zone type of node represented by
843 * @np parameter and fills the read data into a __thermal_zone data structure
844 * and return this pointer.
846 * TODO: Missing properties to parse: thermal-sensor-names
848 * Return: On success returns a valid struct __thermal_zone,
849 * otherwise, it returns a corresponding ERR_PTR(). Caller must
850 * check the return value with help of IS_ERR() helper.
852 static struct __thermal_zone
853 __init *thermal_of_build_thermal_zone(struct device_node *np)
855 struct device_node *child = NULL, *gchild;
856 struct __thermal_zone *tz;
861 pr_err("no thermal zone np\n");
862 return ERR_PTR(-EINVAL);
865 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
867 return ERR_PTR(-ENOMEM);
869 ret = of_property_read_u32(np, "polling-delay-passive", &prop);
871 pr_err("%pOFn: missing polling-delay-passive property\n", np);
874 tz->passive_delay = prop;
876 ret = of_property_read_u32(np, "polling-delay", &prop);
878 pr_err("%pOFn: missing polling-delay property\n", np);
881 tz->polling_delay = prop;
884 * REVIST: for now, the thermal framework supports only
885 * one sensor per thermal zone. Thus, we are considering
886 * only the first two values as slope and offset.
888 ret = of_property_read_u32_array(np, "coefficients", coef, 2);
891 tz->offset = coef[1];
898 child = of_get_child_by_name(np, "trips");
900 /* No trips provided */
904 tz->ntrips = of_get_child_count(child);
905 if (tz->ntrips == 0) /* must have at least one child */
908 tz->trips = kcalloc(tz->ntrips, sizeof(*tz->trips), GFP_KERNEL);
915 for_each_child_of_node(child, gchild) {
916 ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
924 child = of_get_child_by_name(np, "cooling-maps");
926 /* cooling-maps not provided */
930 tz->num_tbps = of_get_child_count(child);
931 if (tz->num_tbps == 0)
934 tz->tbps = kcalloc(tz->num_tbps, sizeof(*tz->tbps), GFP_KERNEL);
941 for_each_child_of_node(child, gchild) {
942 ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
943 tz->trips, tz->ntrips);
954 for (i = i - 1; i >= 0; i--) {
955 struct __thermal_bind_params *tbp = tz->tbps + i;
958 for (j = 0; j < tbp->count; j++)
959 of_node_put(tbp->tcbp[j].cooling_device);
966 for (i = 0; i < tz->ntrips; i++)
967 of_node_put(tz->trips[i].np);
977 static __init void of_thermal_free_zone(struct __thermal_zone *tz)
979 struct __thermal_bind_params *tbp;
982 for (i = 0; i < tz->num_tbps; i++) {
985 for (j = 0; j < tbp->count; j++)
986 of_node_put(tbp->tcbp[j].cooling_device);
992 for (i = 0; i < tz->ntrips; i++)
993 of_node_put(tz->trips[i].np);
999 * of_thermal_destroy_zones - remove all zones parsed and allocated resources
1001 * Finds all zones parsed and added to the thermal framework and remove them
1002 * from the system, together with their resources.
1005 static __init void of_thermal_destroy_zones(void)
1007 struct device_node *np, *child;
1009 np = of_find_node_by_name(NULL, "thermal-zones");
1011 pr_debug("unable to find thermal zones\n");
1015 for_each_available_child_of_node(np, child) {
1016 struct thermal_zone_device *zone;
1018 zone = thermal_zone_get_zone_by_name(child->name);
1022 thermal_zone_device_unregister(zone);
1025 of_thermal_free_zone(zone->devdata);
1031 * of_parse_thermal_zones - parse device tree thermal data
1033 * Initialization function that can be called by machine initialization
1034 * code to parse thermal data and populate the thermal framework
1035 * with hardware thermal zones info. This function only parses thermal zones.
1036 * Cooling devices and sensor devices nodes are supposed to be parsed
1037 * by their respective drivers.
1039 * Return: 0 on success, proper error code otherwise
1042 int __init of_parse_thermal_zones(void)
1044 struct device_node *np, *child;
1045 struct __thermal_zone *tz;
1046 struct thermal_zone_device_ops *ops;
1048 np = of_find_node_by_name(NULL, "thermal-zones");
1050 pr_debug("unable to find thermal zones\n");
1051 return 0; /* Run successfully on systems without thermal DT */
1054 for_each_available_child_of_node(np, child) {
1055 struct thermal_zone_device *zone;
1056 struct thermal_zone_params *tzp;
1060 tz = thermal_of_build_thermal_zone(child);
1062 pr_err("failed to build thermal zone %pOFn: %ld\n",
1068 ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
1072 tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
1078 /* No hwmon because there might be hwmon drivers registering */
1079 tzp->no_hwmon = true;
1081 if (!of_property_read_u32(child, "sustainable-power", &prop))
1082 tzp->sustainable_power = prop;
1084 for (i = 0; i < tz->ntrips; i++)
1087 /* these two are left for temperature drivers to use */
1088 tzp->slope = tz->slope;
1089 tzp->offset = tz->offset;
1091 zone = thermal_zone_device_register(child->name, tz->ntrips,
1097 pr_err("Failed to build %pOFn zone %ld\n", child,
1101 of_thermal_free_zone(tz);
1102 /* attempting to build remaining zones still */
1112 of_thermal_free_zone(tz);
1114 /* no memory available, so free what we have built */
1115 of_thermal_destroy_zones();