1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Thermal sensor driver for Allwinner SOC
4  * Copyright (C) 2019 Yangtao Li
5  *
6  * Based on the work of Icenowy Zheng <icenowy@aosc.io>
7  * Based on the work of Ondrej Jirman <megous@megous.com>
8  * Based on the work of Josef Gajdusek <atx@atx.name>
9  */
10 
11 #include <linux/bitmap.h>
12 #include <linux/clk.h>
13 #include <linux/device.h>
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/nvmem-consumer.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/regmap.h>
20 #include <linux/reset.h>
21 #include <linux/slab.h>
22 #include <linux/thermal.h>
23 
24 #include "thermal_hwmon.h"
25 
26 #define MAX_SENSOR_NUM	4
27 
28 #define FT_TEMP_MASK				GENMASK(11, 0)
29 #define TEMP_CALIB_MASK				GENMASK(11, 0)
30 #define CALIBRATE_DEFAULT			0x800
31 
32 #define SUN8I_THS_CTRL0				0x00
33 #define SUN8I_THS_CTRL2				0x40
34 #define SUN8I_THS_IC				0x44
35 #define SUN8I_THS_IS				0x48
36 #define SUN8I_THS_MFC				0x70
37 #define SUN8I_THS_TEMP_CALIB			0x74
38 #define SUN8I_THS_TEMP_DATA			0x80
39 
40 #define SUN50I_THS_CTRL0			0x00
41 #define SUN50I_H6_THS_ENABLE			0x04
42 #define SUN50I_H6_THS_PC			0x08
43 #define SUN50I_H6_THS_DIC			0x10
44 #define SUN50I_H6_THS_DIS			0x20
45 #define SUN50I_H6_THS_MFC			0x30
46 #define SUN50I_H6_THS_TEMP_CALIB		0xa0
47 #define SUN50I_H6_THS_TEMP_DATA			0xc0
48 
49 #define SUN8I_THS_CTRL0_T_ACQ0(x)		(GENMASK(15, 0) & (x))
50 #define SUN8I_THS_CTRL2_T_ACQ1(x)		((GENMASK(15, 0) & (x)) << 16)
51 #define SUN8I_THS_DATA_IRQ_STS(x)		BIT(x + 8)
52 
53 #define SUN50I_THS_CTRL0_T_ACQ(x)		((GENMASK(15, 0) & (x)) << 16)
54 #define SUN50I_THS_FILTER_EN			BIT(2)
55 #define SUN50I_THS_FILTER_TYPE(x)		(GENMASK(1, 0) & (x))
56 #define SUN50I_H6_THS_PC_TEMP_PERIOD(x)		((GENMASK(19, 0) & (x)) << 12)
57 #define SUN50I_H6_THS_DATA_IRQ_STS(x)		BIT(x)
58 
59 struct tsensor {
60 	struct ths_device		*tmdev;
61 	struct thermal_zone_device	*tzd;
62 	int				id;
63 };
64 
65 struct ths_thermal_chip {
66 	bool            has_mod_clk;
67 	bool            has_bus_clk_reset;
68 	int		sensor_num;
69 	int		offset;
70 	int		scale;
71 	int		ft_deviation;
72 	int		temp_data_base;
73 	int		(*calibrate)(struct ths_device *tmdev,
74 				     u16 *caldata, int callen);
75 	int		(*init)(struct ths_device *tmdev);
76 	unsigned long	(*irq_ack)(struct ths_device *tmdev);
77 	int		(*calc_temp)(struct ths_device *tmdev,
78 				     int id, int reg);
79 };
80 
81 struct ths_device {
82 	const struct ths_thermal_chip		*chip;
83 	struct device				*dev;
84 	struct regmap				*regmap;
85 	struct reset_control			*reset;
86 	struct clk				*bus_clk;
87 	struct clk                              *mod_clk;
88 	struct tsensor				sensor[MAX_SENSOR_NUM];
89 };
90 
91 /* Temp Unit: millidegree Celsius */
92 static int sun8i_ths_calc_temp(struct ths_device *tmdev,
93 			       int id, int reg)
94 {
95 	return tmdev->chip->offset - (reg * tmdev->chip->scale / 10);
96 }
97 
98 static int sun50i_h5_calc_temp(struct ths_device *tmdev,
99 			       int id, int reg)
100 {
101 	if (reg >= 0x500)
102 		return -1191 * reg / 10 + 223000;
103 	else if (!id)
104 		return -1452 * reg / 10 + 259000;
105 	else
106 		return -1590 * reg / 10 + 276000;
107 }
108 
109 static int sun8i_ths_get_temp(struct thermal_zone_device *tz, int *temp)
110 {
111 	struct tsensor *s = thermal_zone_device_priv(tz);
112 	struct ths_device *tmdev = s->tmdev;
113 	int val = 0;
114 
115 	regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
116 		    0x4 * s->id, &val);
117 
118 	/* ths have no data yet */
119 	if (!val)
120 		return -EAGAIN;
121 
122 	*temp = tmdev->chip->calc_temp(tmdev, s->id, val);
123 	/*
124 	 * According to the original sdk, there are some platforms(rarely)
125 	 * that add a fixed offset value after calculating the temperature
126 	 * value. We can't simply put it on the formula for calculating the
127 	 * temperature above, because the formula for calculating the
128 	 * temperature above is also used when the sensor is calibrated. If
129 	 * do this, the correct calibration formula is hard to know.
130 	 */
131 	*temp += tmdev->chip->ft_deviation;
132 
133 	return 0;
134 }
135 
136 static const struct thermal_zone_device_ops ths_ops = {
137 	.get_temp = sun8i_ths_get_temp,
138 };
139 
140 static const struct regmap_config config = {
141 	.reg_bits = 32,
142 	.val_bits = 32,
143 	.reg_stride = 4,
144 	.fast_io = true,
145 	.max_register = 0xfc,
146 };
147 
148 static unsigned long sun8i_h3_irq_ack(struct ths_device *tmdev)
149 {
150 	unsigned long irq_bitmap = 0;
151 	int i, state;
152 
153 	regmap_read(tmdev->regmap, SUN8I_THS_IS, &state);
154 
155 	for (i = 0; i < tmdev->chip->sensor_num; i++) {
156 		if (state & SUN8I_THS_DATA_IRQ_STS(i)) {
157 			regmap_write(tmdev->regmap, SUN8I_THS_IS,
158 				     SUN8I_THS_DATA_IRQ_STS(i));
159 			bitmap_set(&irq_bitmap, i, 1);
160 		}
161 	}
162 
163 	return irq_bitmap;
164 }
165 
166 static unsigned long sun50i_h6_irq_ack(struct ths_device *tmdev)
167 {
168 	unsigned long irq_bitmap = 0;
169 	int i, state;
170 
171 	regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state);
172 
173 	for (i = 0; i < tmdev->chip->sensor_num; i++) {
174 		if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) {
175 			regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS,
176 				     SUN50I_H6_THS_DATA_IRQ_STS(i));
177 			bitmap_set(&irq_bitmap, i, 1);
178 		}
179 	}
180 
181 	return irq_bitmap;
182 }
183 
184 static irqreturn_t sun8i_irq_thread(int irq, void *data)
185 {
186 	struct ths_device *tmdev = data;
187 	unsigned long irq_bitmap = tmdev->chip->irq_ack(tmdev);
188 	int i;
189 
190 	for_each_set_bit(i, &irq_bitmap, tmdev->chip->sensor_num) {
191 		thermal_zone_device_update(tmdev->sensor[i].tzd,
192 					   THERMAL_EVENT_UNSPECIFIED);
193 	}
194 
195 	return IRQ_HANDLED;
196 }
197 
198 static int sun8i_h3_ths_calibrate(struct ths_device *tmdev,
199 				  u16 *caldata, int callen)
200 {
201 	int i;
202 
203 	if (!caldata[0] || callen < 2 * tmdev->chip->sensor_num)
204 		return -EINVAL;
205 
206 	for (i = 0; i < tmdev->chip->sensor_num; i++) {
207 		int offset = (i % 2) << 4;
208 
209 		regmap_update_bits(tmdev->regmap,
210 				   SUN8I_THS_TEMP_CALIB + (4 * (i >> 1)),
211 				   TEMP_CALIB_MASK << offset,
212 				   caldata[i] << offset);
213 	}
214 
215 	return 0;
216 }
217 
218 static int sun50i_h6_ths_calibrate(struct ths_device *tmdev,
219 				   u16 *caldata, int callen)
220 {
221 	struct device *dev = tmdev->dev;
222 	int i, ft_temp;
223 
224 	if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num)
225 		return -EINVAL;
226 
227 	/*
228 	 * efuse layout:
229 	 *
230 	 *	0   11  16	 32
231 	 *	+-------+-------+-------+
232 	 *	|temp|  |sensor0|sensor1|
233 	 *	+-------+-------+-------+
234 	 *
235 	 * The calibration data on the H6 is the ambient temperature and
236 	 * sensor values that are filled during the factory test stage.
237 	 *
238 	 * The unit of stored FT temperature is 0.1 degree celsius.
239 	 *
240 	 * We need to calculate a delta between measured and caluclated
241 	 * register values and this will become a calibration offset.
242 	 */
243 	ft_temp = (caldata[0] & FT_TEMP_MASK) * 100;
244 
245 	for (i = 0; i < tmdev->chip->sensor_num; i++) {
246 		int sensor_reg = caldata[i + 1] & TEMP_CALIB_MASK;
247 		int cdata, offset;
248 		int sensor_temp = tmdev->chip->calc_temp(tmdev, i, sensor_reg);
249 
250 		/*
251 		 * Calibration data is CALIBRATE_DEFAULT - (calculated
252 		 * temperature from sensor reading at factory temperature
253 		 * minus actual factory temperature) * 14.88 (scale from
254 		 * temperature to register values)
255 		 */
256 		cdata = CALIBRATE_DEFAULT -
257 			((sensor_temp - ft_temp) * 10 / tmdev->chip->scale);
258 		if (cdata & ~TEMP_CALIB_MASK) {
259 			/*
260 			 * Calibration value more than 12-bit, but calibration
261 			 * register is 12-bit. In this case, ths hardware can
262 			 * still work without calibration, although the data
263 			 * won't be so accurate.
264 			 */
265 			dev_warn(dev, "sensor%d is not calibrated.\n", i);
266 			continue;
267 		}
268 
269 		offset = (i % 2) * 16;
270 		regmap_update_bits(tmdev->regmap,
271 				   SUN50I_H6_THS_TEMP_CALIB + (i / 2 * 4),
272 				   TEMP_CALIB_MASK << offset,
273 				   cdata << offset);
274 	}
275 
276 	return 0;
277 }
278 
279 static int sun8i_ths_calibrate(struct ths_device *tmdev)
280 {
281 	struct nvmem_cell *calcell;
282 	struct device *dev = tmdev->dev;
283 	u16 *caldata;
284 	size_t callen;
285 	int ret = 0;
286 
287 	calcell = nvmem_cell_get(dev, "calibration");
288 	if (IS_ERR(calcell)) {
289 		if (PTR_ERR(calcell) == -EPROBE_DEFER)
290 			return -EPROBE_DEFER;
291 		/*
292 		 * Even if the external calibration data stored in sid is
293 		 * not accessible, the THS hardware can still work, although
294 		 * the data won't be so accurate.
295 		 *
296 		 * The default value of calibration register is 0x800 for
297 		 * every sensor, and the calibration value is usually 0x7xx
298 		 * or 0x8xx, so they won't be away from the default value
299 		 * for a lot.
300 		 *
301 		 * So here we do not return error if the calibration data is
302 		 * not available, except the probe needs deferring.
303 		 */
304 		goto out;
305 	}
306 
307 	caldata = nvmem_cell_read(calcell, &callen);
308 	if (IS_ERR(caldata)) {
309 		ret = PTR_ERR(caldata);
310 		goto out;
311 	}
312 
313 	tmdev->chip->calibrate(tmdev, caldata, callen);
314 
315 	kfree(caldata);
316 out:
317 	if (!IS_ERR(calcell))
318 		nvmem_cell_put(calcell);
319 	return ret;
320 }
321 
322 static void sun8i_ths_reset_control_assert(void *data)
323 {
324 	reset_control_assert(data);
325 }
326 
327 static int sun8i_ths_resource_init(struct ths_device *tmdev)
328 {
329 	struct device *dev = tmdev->dev;
330 	struct platform_device *pdev = to_platform_device(dev);
331 	void __iomem *base;
332 	int ret;
333 
334 	base = devm_platform_ioremap_resource(pdev, 0);
335 	if (IS_ERR(base))
336 		return PTR_ERR(base);
337 
338 	tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
339 	if (IS_ERR(tmdev->regmap))
340 		return PTR_ERR(tmdev->regmap);
341 
342 	if (tmdev->chip->has_bus_clk_reset) {
343 		tmdev->reset = devm_reset_control_get(dev, NULL);
344 		if (IS_ERR(tmdev->reset))
345 			return PTR_ERR(tmdev->reset);
346 
347 		ret = reset_control_deassert(tmdev->reset);
348 		if (ret)
349 			return ret;
350 
351 		ret = devm_add_action_or_reset(dev, sun8i_ths_reset_control_assert,
352 					       tmdev->reset);
353 		if (ret)
354 			return ret;
355 
356 		tmdev->bus_clk = devm_clk_get_enabled(&pdev->dev, "bus");
357 		if (IS_ERR(tmdev->bus_clk))
358 			return PTR_ERR(tmdev->bus_clk);
359 	}
360 
361 	if (tmdev->chip->has_mod_clk) {
362 		tmdev->mod_clk = devm_clk_get_enabled(&pdev->dev, "mod");
363 		if (IS_ERR(tmdev->mod_clk))
364 			return PTR_ERR(tmdev->mod_clk);
365 	}
366 
367 	ret = clk_set_rate(tmdev->mod_clk, 24000000);
368 	if (ret)
369 		return ret;
370 
371 	ret = sun8i_ths_calibrate(tmdev);
372 	if (ret)
373 		return ret;
374 
375 	return 0;
376 }
377 
378 static int sun8i_h3_thermal_init(struct ths_device *tmdev)
379 {
380 	int val;
381 
382 	/* average over 4 samples */
383 	regmap_write(tmdev->regmap, SUN8I_THS_MFC,
384 		     SUN50I_THS_FILTER_EN |
385 		     SUN50I_THS_FILTER_TYPE(1));
386 	/*
387 	 * clkin = 24MHz
388 	 * filter_samples = 4
389 	 * period = 0.25s
390 	 *
391 	 * x = period * clkin / 4096 / filter_samples - 1
392 	 *   = 365
393 	 */
394 	val = GENMASK(7 + tmdev->chip->sensor_num, 8);
395 	regmap_write(tmdev->regmap, SUN8I_THS_IC,
396 		     SUN50I_H6_THS_PC_TEMP_PERIOD(365) | val);
397 	/*
398 	 * T_acq = 20us
399 	 * clkin = 24MHz
400 	 *
401 	 * x = T_acq * clkin - 1
402 	 *   = 479
403 	 */
404 	regmap_write(tmdev->regmap, SUN8I_THS_CTRL0,
405 		     SUN8I_THS_CTRL0_T_ACQ0(479));
406 	val = GENMASK(tmdev->chip->sensor_num - 1, 0);
407 	regmap_write(tmdev->regmap, SUN8I_THS_CTRL2,
408 		     SUN8I_THS_CTRL2_T_ACQ1(479) | val);
409 
410 	return 0;
411 }
412 
413 /*
414  * Without this undocumented value, the returned temperatures would
415  * be higher than real ones by about 20C.
416  */
417 #define SUN50I_H6_CTRL0_UNK 0x0000002f
418 
419 static int sun50i_h6_thermal_init(struct ths_device *tmdev)
420 {
421 	int val;
422 
423 	/*
424 	 * T_acq = 20us
425 	 * clkin = 24MHz
426 	 *
427 	 * x = T_acq * clkin - 1
428 	 *   = 479
429 	 */
430 	regmap_write(tmdev->regmap, SUN50I_THS_CTRL0,
431 		     SUN50I_H6_CTRL0_UNK | SUN50I_THS_CTRL0_T_ACQ(479));
432 	/* average over 4 samples */
433 	regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC,
434 		     SUN50I_THS_FILTER_EN |
435 		     SUN50I_THS_FILTER_TYPE(1));
436 	/*
437 	 * clkin = 24MHz
438 	 * filter_samples = 4
439 	 * period = 0.25s
440 	 *
441 	 * x = period * clkin / 4096 / filter_samples - 1
442 	 *   = 365
443 	 */
444 	regmap_write(tmdev->regmap, SUN50I_H6_THS_PC,
445 		     SUN50I_H6_THS_PC_TEMP_PERIOD(365));
446 	/* enable sensor */
447 	val = GENMASK(tmdev->chip->sensor_num - 1, 0);
448 	regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val);
449 	/* thermal data interrupt enable */
450 	val = GENMASK(tmdev->chip->sensor_num - 1, 0);
451 	regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val);
452 
453 	return 0;
454 }
455 
456 static int sun8i_ths_register(struct ths_device *tmdev)
457 {
458 	int i;
459 
460 	for (i = 0; i < tmdev->chip->sensor_num; i++) {
461 		tmdev->sensor[i].tmdev = tmdev;
462 		tmdev->sensor[i].id = i;
463 		tmdev->sensor[i].tzd =
464 			devm_thermal_of_zone_register(tmdev->dev,
465 						      i,
466 						      &tmdev->sensor[i],
467 						      &ths_ops);
468 		if (IS_ERR(tmdev->sensor[i].tzd))
469 			return PTR_ERR(tmdev->sensor[i].tzd);
470 
471 		devm_thermal_add_hwmon_sysfs(tmdev->dev, tmdev->sensor[i].tzd);
472 	}
473 
474 	return 0;
475 }
476 
477 static int sun8i_ths_probe(struct platform_device *pdev)
478 {
479 	struct ths_device *tmdev;
480 	struct device *dev = &pdev->dev;
481 	int ret, irq;
482 
483 	tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL);
484 	if (!tmdev)
485 		return -ENOMEM;
486 
487 	tmdev->dev = dev;
488 	tmdev->chip = of_device_get_match_data(&pdev->dev);
489 	if (!tmdev->chip)
490 		return -EINVAL;
491 
492 	ret = sun8i_ths_resource_init(tmdev);
493 	if (ret)
494 		return ret;
495 
496 	irq = platform_get_irq(pdev, 0);
497 	if (irq < 0)
498 		return irq;
499 
500 	ret = tmdev->chip->init(tmdev);
501 	if (ret)
502 		return ret;
503 
504 	ret = sun8i_ths_register(tmdev);
505 	if (ret)
506 		return ret;
507 
508 	/*
509 	 * Avoid entering the interrupt handler, the thermal device is not
510 	 * registered yet, we deffer the registration of the interrupt to
511 	 * the end.
512 	 */
513 	ret = devm_request_threaded_irq(dev, irq, NULL,
514 					sun8i_irq_thread,
515 					IRQF_ONESHOT, "ths", tmdev);
516 	if (ret)
517 		return ret;
518 
519 	return 0;
520 }
521 
522 static const struct ths_thermal_chip sun8i_a83t_ths = {
523 	.sensor_num = 3,
524 	.scale = 705,
525 	.offset = 191668,
526 	.temp_data_base = SUN8I_THS_TEMP_DATA,
527 	.calibrate = sun8i_h3_ths_calibrate,
528 	.init = sun8i_h3_thermal_init,
529 	.irq_ack = sun8i_h3_irq_ack,
530 	.calc_temp = sun8i_ths_calc_temp,
531 };
532 
533 static const struct ths_thermal_chip sun8i_h3_ths = {
534 	.sensor_num = 1,
535 	.scale = 1211,
536 	.offset = 217000,
537 	.has_mod_clk = true,
538 	.has_bus_clk_reset = true,
539 	.temp_data_base = SUN8I_THS_TEMP_DATA,
540 	.calibrate = sun8i_h3_ths_calibrate,
541 	.init = sun8i_h3_thermal_init,
542 	.irq_ack = sun8i_h3_irq_ack,
543 	.calc_temp = sun8i_ths_calc_temp,
544 };
545 
546 static const struct ths_thermal_chip sun8i_r40_ths = {
547 	.sensor_num = 2,
548 	.offset = 251086,
549 	.scale = 1130,
550 	.has_mod_clk = true,
551 	.has_bus_clk_reset = true,
552 	.temp_data_base = SUN8I_THS_TEMP_DATA,
553 	.calibrate = sun8i_h3_ths_calibrate,
554 	.init = sun8i_h3_thermal_init,
555 	.irq_ack = sun8i_h3_irq_ack,
556 	.calc_temp = sun8i_ths_calc_temp,
557 };
558 
559 static const struct ths_thermal_chip sun50i_a64_ths = {
560 	.sensor_num = 3,
561 	.offset = 260890,
562 	.scale = 1170,
563 	.has_mod_clk = true,
564 	.has_bus_clk_reset = true,
565 	.temp_data_base = SUN8I_THS_TEMP_DATA,
566 	.calibrate = sun8i_h3_ths_calibrate,
567 	.init = sun8i_h3_thermal_init,
568 	.irq_ack = sun8i_h3_irq_ack,
569 	.calc_temp = sun8i_ths_calc_temp,
570 };
571 
572 static const struct ths_thermal_chip sun50i_a100_ths = {
573 	.sensor_num = 3,
574 	.has_bus_clk_reset = true,
575 	.ft_deviation = 8000,
576 	.offset = 187744,
577 	.scale = 672,
578 	.temp_data_base = SUN50I_H6_THS_TEMP_DATA,
579 	.calibrate = sun50i_h6_ths_calibrate,
580 	.init = sun50i_h6_thermal_init,
581 	.irq_ack = sun50i_h6_irq_ack,
582 	.calc_temp = sun8i_ths_calc_temp,
583 };
584 
585 static const struct ths_thermal_chip sun50i_h5_ths = {
586 	.sensor_num = 2,
587 	.has_mod_clk = true,
588 	.has_bus_clk_reset = true,
589 	.temp_data_base = SUN8I_THS_TEMP_DATA,
590 	.calibrate = sun8i_h3_ths_calibrate,
591 	.init = sun8i_h3_thermal_init,
592 	.irq_ack = sun8i_h3_irq_ack,
593 	.calc_temp = sun50i_h5_calc_temp,
594 };
595 
596 static const struct ths_thermal_chip sun50i_h6_ths = {
597 	.sensor_num = 2,
598 	.has_bus_clk_reset = true,
599 	.ft_deviation = 7000,
600 	.offset = 187744,
601 	.scale = 672,
602 	.temp_data_base = SUN50I_H6_THS_TEMP_DATA,
603 	.calibrate = sun50i_h6_ths_calibrate,
604 	.init = sun50i_h6_thermal_init,
605 	.irq_ack = sun50i_h6_irq_ack,
606 	.calc_temp = sun8i_ths_calc_temp,
607 };
608 
609 static const struct of_device_id of_ths_match[] = {
610 	{ .compatible = "allwinner,sun8i-a83t-ths", .data = &sun8i_a83t_ths },
611 	{ .compatible = "allwinner,sun8i-h3-ths", .data = &sun8i_h3_ths },
612 	{ .compatible = "allwinner,sun8i-r40-ths", .data = &sun8i_r40_ths },
613 	{ .compatible = "allwinner,sun50i-a64-ths", .data = &sun50i_a64_ths },
614 	{ .compatible = "allwinner,sun50i-a100-ths", .data = &sun50i_a100_ths },
615 	{ .compatible = "allwinner,sun50i-h5-ths", .data = &sun50i_h5_ths },
616 	{ .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
617 	{ /* sentinel */ },
618 };
619 MODULE_DEVICE_TABLE(of, of_ths_match);
620 
621 static struct platform_driver ths_driver = {
622 	.probe = sun8i_ths_probe,
623 	.driver = {
624 		.name = "sun8i-thermal",
625 		.of_match_table = of_ths_match,
626 	},
627 };
628 module_platform_driver(ths_driver);
629 
630 MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC");
631 MODULE_LICENSE("GPL v2");
632