1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HiSilicon thermal sensor driver
4  *
5  * Copyright (c) 2014-2015 HiSilicon Limited.
6  * Copyright (c) 2014-2015 Linaro Limited.
7  *
8  * Xinwei Kong <kong.kongxinwei@hisilicon.com>
9  * Leo Yan <leo.yan@linaro.org>
10  */
11 
12 #include <linux/cpufreq.h>
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/io.h>
18 #include <linux/of_device.h>
19 
20 #include "thermal_core.h"
21 
22 #define HI6220_TEMP0_LAG			(0x0)
23 #define HI6220_TEMP0_TH				(0x4)
24 #define HI6220_TEMP0_RST_TH			(0x8)
25 #define HI6220_TEMP0_CFG			(0xC)
26 #define HI6220_TEMP0_CFG_SS_MSK			(0xF000)
27 #define HI6220_TEMP0_CFG_HDAK_MSK		(0x30)
28 #define HI6220_TEMP0_EN				(0x10)
29 #define HI6220_TEMP0_INT_EN			(0x14)
30 #define HI6220_TEMP0_INT_CLR			(0x18)
31 #define HI6220_TEMP0_RST_MSK			(0x1C)
32 #define HI6220_TEMP0_VALUE			(0x28)
33 
34 #define HI3660_OFFSET(chan)		((chan) * 0x40)
35 #define HI3660_TEMP(chan)		(HI3660_OFFSET(chan) + 0x1C)
36 #define HI3660_TH(chan)			(HI3660_OFFSET(chan) + 0x20)
37 #define HI3660_LAG(chan)		(HI3660_OFFSET(chan) + 0x28)
38 #define HI3660_INT_EN(chan)		(HI3660_OFFSET(chan) + 0x2C)
39 #define HI3660_INT_CLR(chan)		(HI3660_OFFSET(chan) + 0x30)
40 
41 #define HI6220_TEMP_BASE			(-60000)
42 #define HI6220_TEMP_RESET			(100000)
43 #define HI6220_TEMP_STEP			(785)
44 #define HI6220_TEMP_LAG				(3500)
45 
46 #define HI3660_TEMP_BASE		(-63780)
47 #define HI3660_TEMP_STEP		(205)
48 #define HI3660_TEMP_LAG			(4000)
49 
50 #define HI6220_CLUSTER0_SENSOR		2
51 #define HI6220_CLUSTER1_SENSOR		1
52 
53 #define HI3660_LITTLE_SENSOR		0
54 #define HI3660_BIG_SENSOR		1
55 #define HI3660_G3D_SENSOR		2
56 #define HI3660_MODEM_SENSOR		3
57 
58 struct hisi_thermal_data;
59 
60 struct hisi_thermal_sensor {
61 	struct hisi_thermal_data *data;
62 	struct thermal_zone_device *tzd;
63 	const char *irq_name;
64 	uint32_t id;
65 	uint32_t thres_temp;
66 };
67 
68 struct hisi_thermal_ops {
69 	int (*get_temp)(struct hisi_thermal_sensor *sensor);
70 	int (*enable_sensor)(struct hisi_thermal_sensor *sensor);
71 	int (*disable_sensor)(struct hisi_thermal_sensor *sensor);
72 	int (*irq_handler)(struct hisi_thermal_sensor *sensor);
73 	int (*probe)(struct hisi_thermal_data *data);
74 };
75 
76 struct hisi_thermal_data {
77 	const struct hisi_thermal_ops *ops;
78 	struct hisi_thermal_sensor *sensor;
79 	struct platform_device *pdev;
80 	struct clk *clk;
81 	void __iomem *regs;
82 	int nr_sensors;
83 };
84 
85 /*
86  * The temperature computation on the tsensor is as follow:
87  *	Unit: millidegree Celsius
88  *	Step: 200/255 (0.7843)
89  *	Temperature base: -60°C
90  *
91  * The register is programmed in temperature steps, every step is 785
92  * millidegree and begins at -60 000 m°C
93  *
94  * The temperature from the steps:
95  *
96  *	Temp = TempBase + (steps x 785)
97  *
98  * and the steps from the temperature:
99  *
100  *	steps = (Temp - TempBase) / 785
101  *
102  */
103 static inline int hi6220_thermal_step_to_temp(int step)
104 {
105 	return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
106 }
107 
108 static inline int hi6220_thermal_temp_to_step(int temp)
109 {
110 	return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
111 }
112 
113 /*
114  * for Hi3660,
115  *	Step: 189/922 (0.205)
116  *	Temperature base: -63.780°C
117  *
118  * The register is programmed in temperature steps, every step is 205
119  * millidegree and begins at -63 780 m°C
120  */
121 static inline int hi3660_thermal_step_to_temp(int step)
122 {
123 	return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP;
124 }
125 
126 static inline int hi3660_thermal_temp_to_step(int temp)
127 {
128 	return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP);
129 }
130 
131 /*
132  * The lag register contains 5 bits encoding the temperature in steps.
133  *
134  * Each time the temperature crosses the threshold boundary, an
135  * interrupt is raised. It could be when the temperature is going
136  * above the threshold or below. However, if the temperature is
137  * fluctuating around this value due to the load, we can receive
138  * several interrupts which may not desired.
139  *
140  * We can setup a temperature representing the delta between the
141  * threshold and the current temperature when the temperature is
142  * decreasing.
143  *
144  * For instance: the lag register is 5°C, the threshold is 65°C, when
145  * the temperature reaches 65°C an interrupt is raised and when the
146  * temperature decrease to 65°C - 5°C another interrupt is raised.
147  *
148  * A very short lag can lead to an interrupt storm, a long lag
149  * increase the latency to react to the temperature changes.  In our
150  * case, that is not really a problem as we are polling the
151  * temperature.
152  *
153  * [0:4] : lag register
154  *
155  * The temperature is coded in steps, cf. HI6220_TEMP_STEP.
156  *
157  * Min : 0x00 :  0.0 °C
158  * Max : 0x1F : 24.3 °C
159  *
160  * The 'value' parameter is in milliCelsius.
161  */
162 static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
163 {
164 	writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
165 			addr + HI6220_TEMP0_LAG);
166 }
167 
168 static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
169 {
170 	writel(value, addr + HI6220_TEMP0_INT_CLR);
171 }
172 
173 static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
174 {
175 	writel(value, addr + HI6220_TEMP0_INT_EN);
176 }
177 
178 static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
179 {
180 	writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00,
181 	       addr + HI6220_TEMP0_TH);
182 }
183 
184 static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
185 {
186 	writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
187 }
188 
189 static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
190 {
191 	writel(value, addr + HI6220_TEMP0_RST_MSK);
192 }
193 
194 static inline void hi6220_thermal_enable(void __iomem *addr, int value)
195 {
196 	writel(value, addr + HI6220_TEMP0_EN);
197 }
198 
199 static inline int hi6220_thermal_get_temperature(void __iomem *addr)
200 {
201 	return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
202 }
203 
204 /*
205  * [0:6] lag register
206  *
207  * The temperature is coded in steps, cf. HI3660_TEMP_STEP.
208  *
209  * Min : 0x00 :  0.0 °C
210  * Max : 0x7F : 26.0 °C
211  *
212  */
213 static inline void hi3660_thermal_set_lag(void __iomem *addr,
214 					  int id, int value)
215 {
216 	writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F,
217 			addr + HI3660_LAG(id));
218 }
219 
220 static inline void hi3660_thermal_alarm_clear(void __iomem *addr,
221 					      int id, int value)
222 {
223 	writel(value, addr + HI3660_INT_CLR(id));
224 }
225 
226 static inline void hi3660_thermal_alarm_enable(void __iomem *addr,
227 					       int id, int value)
228 {
229 	writel(value, addr + HI3660_INT_EN(id));
230 }
231 
232 static inline void hi3660_thermal_alarm_set(void __iomem *addr,
233 					    int id, int value)
234 {
235 	writel(value, addr + HI3660_TH(id));
236 }
237 
238 static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id)
239 {
240 	return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id)));
241 }
242 
243 /*
244  * Temperature configuration register - Sensor selection
245  *
246  * Bits [19:12]
247  *
248  * 0x0: local sensor (default)
249  * 0x1: remote sensor 1 (ACPU cluster 1)
250  * 0x2: remote sensor 2 (ACPU cluster 0)
251  * 0x3: remote sensor 3 (G3D)
252  */
253 static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
254 {
255 	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) |
256 	       (sensor << 12), addr + HI6220_TEMP0_CFG);
257 }
258 
259 /*
260  * Temperature configuration register - Hdak conversion polling interval
261  *
262  * Bits [5:4]
263  *
264  * 0x0 :   0.768 ms
265  * 0x1 :   6.144 ms
266  * 0x2 :  49.152 ms
267  * 0x3 : 393.216 ms
268  */
269 static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
270 {
271 	writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) |
272 	       (value << 4), addr + HI6220_TEMP0_CFG);
273 }
274 
275 static int hi6220_thermal_irq_handler(struct hisi_thermal_sensor *sensor)
276 {
277 	struct hisi_thermal_data *data = sensor->data;
278 
279 	hi6220_thermal_alarm_clear(data->regs, 1);
280 	return 0;
281 }
282 
283 static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor)
284 {
285 	struct hisi_thermal_data *data = sensor->data;
286 
287 	hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
288 	return 0;
289 }
290 
291 static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor)
292 {
293 	struct hisi_thermal_data *data = sensor->data;
294 
295 	return hi6220_thermal_get_temperature(data->regs);
296 }
297 
298 static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor)
299 {
300 	struct hisi_thermal_data *data = sensor->data;
301 
302 	return hi3660_thermal_get_temperature(data->regs, sensor->id);
303 }
304 
305 static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor)
306 {
307 	struct hisi_thermal_data *data = sensor->data;
308 
309 	/* disable sensor module */
310 	hi6220_thermal_enable(data->regs, 0);
311 	hi6220_thermal_alarm_enable(data->regs, 0);
312 	hi6220_thermal_reset_enable(data->regs, 0);
313 
314 	clk_disable_unprepare(data->clk);
315 
316 	return 0;
317 }
318 
319 static int hi3660_thermal_disable_sensor(struct hisi_thermal_sensor *sensor)
320 {
321 	struct hisi_thermal_data *data = sensor->data;
322 
323 	/* disable sensor module */
324 	hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
325 	return 0;
326 }
327 
328 static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor)
329 {
330 	struct hisi_thermal_data *data = sensor->data;
331 	int ret;
332 
333 	/* enable clock for tsensor */
334 	ret = clk_prepare_enable(data->clk);
335 	if (ret)
336 		return ret;
337 
338 	/* disable module firstly */
339 	hi6220_thermal_reset_enable(data->regs, 0);
340 	hi6220_thermal_enable(data->regs, 0);
341 
342 	/* select sensor id */
343 	hi6220_thermal_sensor_select(data->regs, sensor->id);
344 
345 	/* setting the hdak time */
346 	hi6220_thermal_hdak_set(data->regs, 0);
347 
348 	/* setting lag value between current temp and the threshold */
349 	hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
350 
351 	/* enable for interrupt */
352 	hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
353 
354 	hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
355 
356 	/* enable module */
357 	hi6220_thermal_reset_enable(data->regs, 1);
358 	hi6220_thermal_enable(data->regs, 1);
359 
360 	hi6220_thermal_alarm_clear(data->regs, 0);
361 	hi6220_thermal_alarm_enable(data->regs, 1);
362 
363 	return 0;
364 }
365 
366 static int hi3660_thermal_enable_sensor(struct hisi_thermal_sensor *sensor)
367 {
368 	unsigned int value;
369 	struct hisi_thermal_data *data = sensor->data;
370 
371 	/* disable interrupt */
372 	hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
373 
374 	/* setting lag value between current temp and the threshold */
375 	hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG);
376 
377 	/* set interrupt threshold */
378 	value = hi3660_thermal_temp_to_step(sensor->thres_temp);
379 	hi3660_thermal_alarm_set(data->regs, sensor->id, value);
380 
381 	/* enable interrupt */
382 	hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
383 	hi3660_thermal_alarm_enable(data->regs, sensor->id, 1);
384 
385 	return 0;
386 }
387 
388 static int hi6220_thermal_probe(struct hisi_thermal_data *data)
389 {
390 	struct platform_device *pdev = data->pdev;
391 	struct device *dev = &pdev->dev;
392 	int ret;
393 
394 	data->clk = devm_clk_get(dev, "thermal_clk");
395 	if (IS_ERR(data->clk)) {
396 		ret = PTR_ERR(data->clk);
397 		if (ret != -EPROBE_DEFER)
398 			dev_err(dev, "failed to get thermal clk: %d\n", ret);
399 		return ret;
400 	}
401 
402 	data->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL);
403 	if (!data->sensor)
404 		return -ENOMEM;
405 
406 	data->sensor[0].id = HI6220_CLUSTER0_SENSOR;
407 	data->sensor[0].irq_name = "tsensor_intr";
408 	data->sensor[0].data = data;
409 	data->nr_sensors = 1;
410 
411 	return 0;
412 }
413 
414 static int hi3660_thermal_probe(struct hisi_thermal_data *data)
415 {
416 	struct platform_device *pdev = data->pdev;
417 	struct device *dev = &pdev->dev;
418 
419 	data->nr_sensors = 1;
420 
421 	data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) *
422 				    data->nr_sensors, GFP_KERNEL);
423 	if (!data->sensor)
424 		return -ENOMEM;
425 
426 	data->sensor[0].id = HI3660_BIG_SENSOR;
427 	data->sensor[0].irq_name = "tsensor_a73";
428 	data->sensor[0].data = data;
429 
430 	data->sensor[1].id = HI3660_LITTLE_SENSOR;
431 	data->sensor[1].irq_name = "tsensor_a53";
432 	data->sensor[1].data = data;
433 
434 	return 0;
435 }
436 
437 static int hisi_thermal_get_temp(void *__data, int *temp)
438 {
439 	struct hisi_thermal_sensor *sensor = __data;
440 	struct hisi_thermal_data *data = sensor->data;
441 
442 	*temp = data->ops->get_temp(sensor);
443 
444 	dev_dbg(&data->pdev->dev, "tzd=%p, id=%d, temp=%d, thres=%d\n",
445 		sensor->tzd, sensor->id, *temp, sensor->thres_temp);
446 
447 	return 0;
448 }
449 
450 static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
451 	.get_temp = hisi_thermal_get_temp,
452 };
453 
454 static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
455 {
456 	struct hisi_thermal_sensor *sensor = dev;
457 	struct hisi_thermal_data *data = sensor->data;
458 	int temp = 0;
459 
460 	data->ops->irq_handler(sensor);
461 
462 	hisi_thermal_get_temp(sensor, &temp);
463 
464 	if (temp >= sensor->thres_temp) {
465 		dev_crit(&data->pdev->dev,
466 			 "sensor <%d> THERMAL ALARM: %d > %d\n",
467 			 sensor->id, temp, sensor->thres_temp);
468 
469 		thermal_zone_device_update(sensor->tzd,
470 					   THERMAL_EVENT_UNSPECIFIED);
471 
472 	} else {
473 		dev_crit(&data->pdev->dev,
474 			 "sensor <%d> THERMAL ALARM stopped: %d < %d\n",
475 			 sensor->id, temp, sensor->thres_temp);
476 	}
477 
478 	return IRQ_HANDLED;
479 }
480 
481 static int hisi_thermal_register_sensor(struct platform_device *pdev,
482 					struct hisi_thermal_sensor *sensor)
483 {
484 	int ret, i;
485 	const struct thermal_trip *trip;
486 
487 	sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
488 							   sensor->id, sensor,
489 							   &hisi_of_thermal_ops);
490 	if (IS_ERR(sensor->tzd)) {
491 		ret = PTR_ERR(sensor->tzd);
492 		sensor->tzd = NULL;
493 		dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
494 			sensor->id, ret);
495 		return ret;
496 	}
497 
498 	trip = of_thermal_get_trip_points(sensor->tzd);
499 
500 	for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
501 		if (trip[i].type == THERMAL_TRIP_PASSIVE) {
502 			sensor->thres_temp = trip[i].temperature;
503 			break;
504 		}
505 	}
506 
507 	return 0;
508 }
509 
510 static const struct hisi_thermal_ops hi6220_ops = {
511 	.get_temp	= hi6220_thermal_get_temp,
512 	.enable_sensor	= hi6220_thermal_enable_sensor,
513 	.disable_sensor	= hi6220_thermal_disable_sensor,
514 	.irq_handler	= hi6220_thermal_irq_handler,
515 	.probe		= hi6220_thermal_probe,
516 };
517 
518 static const struct hisi_thermal_ops hi3660_ops = {
519 	.get_temp	= hi3660_thermal_get_temp,
520 	.enable_sensor	= hi3660_thermal_enable_sensor,
521 	.disable_sensor	= hi3660_thermal_disable_sensor,
522 	.irq_handler	= hi3660_thermal_irq_handler,
523 	.probe		= hi3660_thermal_probe,
524 };
525 
526 static const struct of_device_id of_hisi_thermal_match[] = {
527 	{
528 		.compatible = "hisilicon,tsensor",
529 		.data = &hi6220_ops,
530 	},
531 	{
532 		.compatible = "hisilicon,hi3660-tsensor",
533 		.data = &hi3660_ops,
534 	},
535 	{ /* end */ }
536 };
537 MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
538 
539 static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
540 				       bool on)
541 {
542 	struct thermal_zone_device *tzd = sensor->tzd;
543 
544 	if (on)
545 		thermal_zone_device_enable(tzd);
546 	else
547 		thermal_zone_device_disable(tzd);
548 }
549 
550 static int hisi_thermal_probe(struct platform_device *pdev)
551 {
552 	struct hisi_thermal_data *data;
553 	struct device *dev = &pdev->dev;
554 	struct resource *res;
555 	int i, ret;
556 
557 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
558 	if (!data)
559 		return -ENOMEM;
560 
561 	data->pdev = pdev;
562 	platform_set_drvdata(pdev, data);
563 	data->ops = of_device_get_match_data(dev);
564 
565 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
566 	data->regs = devm_ioremap_resource(dev, res);
567 	if (IS_ERR(data->regs))
568 		return PTR_ERR(data->regs);
569 
570 	ret = data->ops->probe(data);
571 	if (ret)
572 		return ret;
573 
574 	for (i = 0; i < data->nr_sensors; i++) {
575 		struct hisi_thermal_sensor *sensor = &data->sensor[i];
576 
577 		ret = hisi_thermal_register_sensor(pdev, sensor);
578 		if (ret) {
579 			dev_err(dev, "failed to register thermal sensor: %d\n",
580 				ret);
581 			return ret;
582 		}
583 
584 		ret = platform_get_irq(pdev, 0);
585 		if (ret < 0)
586 			return ret;
587 
588 		ret = devm_request_threaded_irq(dev, ret, NULL,
589 						hisi_thermal_alarm_irq_thread,
590 						IRQF_ONESHOT, sensor->irq_name,
591 						sensor);
592 		if (ret < 0) {
593 			dev_err(dev, "Failed to request alarm irq: %d\n", ret);
594 			return ret;
595 		}
596 
597 		ret = data->ops->enable_sensor(sensor);
598 		if (ret) {
599 			dev_err(dev, "Failed to setup the sensor: %d\n", ret);
600 			return ret;
601 		}
602 
603 		hisi_thermal_toggle_sensor(sensor, true);
604 	}
605 
606 	return 0;
607 }
608 
609 static int hisi_thermal_remove(struct platform_device *pdev)
610 {
611 	struct hisi_thermal_data *data = platform_get_drvdata(pdev);
612 	int i;
613 
614 	for (i = 0; i < data->nr_sensors; i++) {
615 		struct hisi_thermal_sensor *sensor = &data->sensor[i];
616 
617 		hisi_thermal_toggle_sensor(sensor, false);
618 		data->ops->disable_sensor(sensor);
619 	}
620 
621 	return 0;
622 }
623 
624 static int hisi_thermal_suspend(struct device *dev)
625 {
626 	struct hisi_thermal_data *data = dev_get_drvdata(dev);
627 	int i;
628 
629 	for (i = 0; i < data->nr_sensors; i++)
630 		data->ops->disable_sensor(&data->sensor[i]);
631 
632 	return 0;
633 }
634 
635 static int hisi_thermal_resume(struct device *dev)
636 {
637 	struct hisi_thermal_data *data = dev_get_drvdata(dev);
638 	int i, ret = 0;
639 
640 	for (i = 0; i < data->nr_sensors; i++)
641 		ret |= data->ops->enable_sensor(&data->sensor[i]);
642 
643 	return ret;
644 }
645 
646 static DEFINE_SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
647 			 hisi_thermal_suspend, hisi_thermal_resume);
648 
649 static struct platform_driver hisi_thermal_driver = {
650 	.driver = {
651 		.name		= "hisi_thermal",
652 		.pm		= pm_sleep_ptr(&hisi_thermal_pm_ops),
653 		.of_match_table = of_hisi_thermal_match,
654 	},
655 	.probe	= hisi_thermal_probe,
656 	.remove	= hisi_thermal_remove,
657 };
658 
659 module_platform_driver(hisi_thermal_driver);
660 
661 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
662 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
663 MODULE_DESCRIPTION("HiSilicon thermal driver");
664 MODULE_LICENSE("GPL v2");
665