xref: /linux/drivers/thermal/k3_j72xx_bandgap.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * TI Bandgap temperature sensor driver for J72XX SoC Family
4  *
5  * Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/
6  */
7 
8 #include <linux/math.h>
9 #include <linux/math64.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/err.h>
16 #include <linux/types.h>
17 #include <linux/io.h>
18 #include <linux/thermal.h>
19 #include <linux/of.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 
23 #define K3_VTM_DEVINFO_PWR0_OFFSET		0x4
24 #define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK	0xf0
25 #define K3_VTM_TMPSENS0_CTRL_OFFSET		0x300
26 #define K3_VTM_MISC_CTRL_OFFSET			0xc
27 #define K3_VTM_TMPSENS_STAT_OFFSET		0x8
28 #define K3_VTM_ANYMAXT_OUTRG_ALERT_EN		0x1
29 #define K3_VTM_MISC_CTRL2_OFFSET		0x10
30 #define K3_VTM_TS_STAT_DTEMP_MASK		0x3ff
31 #define K3_VTM_MAX_NUM_TS			8
32 #define K3_VTM_TMPSENS_CTRL_SOC			BIT(5)
33 #define K3_VTM_TMPSENS_CTRL_CLRZ		BIT(6)
34 #define K3_VTM_TMPSENS_CTRL_CLKON_REQ		BIT(7)
35 #define K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN	BIT(11)
36 
37 #define K3_VTM_CORRECTION_TEMP_CNT		3
38 
39 #define MINUS40CREF				5
40 #define PLUS30CREF				253
41 #define PLUS125CREF				730
42 #define PLUS150CREF				940
43 
44 #define TABLE_SIZE				1024
45 #define MAX_TEMP				123000
46 #define COOL_DOWN_TEMP				105000
47 
48 #define FACTORS_REDUCTION			13
49 static int *derived_table;
50 
compute_value(int index,const s64 * factors,int nr_factors,int reduction)51 static int compute_value(int index, const s64 *factors, int nr_factors,
52 			 int reduction)
53 {
54 	s64 value = 0;
55 	int i;
56 
57 	for (i = 0; i < nr_factors; i++)
58 		value += factors[i] * int_pow(index, i);
59 
60 	return (int)div64_s64(value, int_pow(10, reduction));
61 }
62 
init_table(int factors_size,int * table,const s64 * factors)63 static void init_table(int factors_size, int *table, const s64 *factors)
64 {
65 	int i;
66 
67 	for (i = 0; i < TABLE_SIZE; i++)
68 		table[i] = compute_value(i, factors, factors_size,
69 					 FACTORS_REDUCTION);
70 }
71 
72 /**
73  * struct err_values - structure containing error/reference values
74  * @refs: reference error values for -40C, 30C, 125C & 150C
75  * @errs: Actual error values for -40C, 30C, 125C & 150C read from the efuse
76  */
77 struct err_values {
78 	int refs[4];
79 	int errs[4];
80 };
81 
create_table_segments(struct err_values * err_vals,int seg,int * ref_table)82 static void create_table_segments(struct err_values *err_vals, int seg,
83 				  int *ref_table)
84 {
85 	int m = 0, c, num, den, i, err, idx1, idx2, err1, err2, ref1, ref2;
86 
87 	if (seg == 0)
88 		idx1 = 0;
89 	else
90 		idx1 = err_vals->refs[seg];
91 
92 	idx2 = err_vals->refs[seg + 1];
93 	err1 = err_vals->errs[seg];
94 	err2 = err_vals->errs[seg + 1];
95 	ref1 = err_vals->refs[seg];
96 	ref2 = err_vals->refs[seg + 1];
97 
98 	/*
99 	 * Calculate the slope with adc values read from the register
100 	 * as the y-axis param and err in adc value as x-axis param
101 	 */
102 	num = ref2 - ref1;
103 	den = err2 - err1;
104 	if (den)
105 		m = num / den;
106 	c = ref2 - m * err2;
107 
108 	/*
109 	 * Take care of divide by zero error if error values are same
110 	 * Or when the slope is 0
111 	 */
112 	if (den != 0 && m != 0) {
113 		for (i = idx1; i <= idx2; i++) {
114 			err = (i - c) / m;
115 			if (((i + err) < 0) || ((i + err) >= TABLE_SIZE))
116 				continue;
117 			derived_table[i] = ref_table[i + err];
118 		}
119 	} else { /* Constant error take care of divide by zero */
120 		for (i = idx1; i <= idx2; i++) {
121 			if (((i + err1) < 0) || ((i + err1) >= TABLE_SIZE))
122 				continue;
123 			derived_table[i] = ref_table[i + err1];
124 		}
125 	}
126 }
127 
prep_lookup_table(struct err_values * err_vals,int * ref_table)128 static int prep_lookup_table(struct err_values *err_vals, int *ref_table)
129 {
130 	int inc, i, seg;
131 
132 	/*
133 	 * Fill up the lookup table under 3 segments
134 	 * region -40C to +30C
135 	 * region +30C to +125C
136 	 * region +125C to +150C
137 	 */
138 	for (seg = 0; seg < 3; seg++)
139 		create_table_segments(err_vals, seg, ref_table);
140 
141 	/* Get to the first valid temperature */
142 	i = 0;
143 	while (!derived_table[i])
144 		i++;
145 
146 	/*
147 	 * Get to the last zero index and back fill the temperature for
148 	 * sake of continuity
149 	 */
150 	if (i) {
151 		/* 300 milli celsius steps */
152 		while (i--)
153 			derived_table[i] = derived_table[i + 1] - 300;
154 	}
155 
156 	/*
157 	 * Fill the last trailing 0s which are unfilled with increments of
158 	 * 100 milli celsius till 1023 code
159 	 */
160 	i = TABLE_SIZE - 1;
161 	while (!derived_table[i])
162 		i--;
163 
164 	i++;
165 	inc = 1;
166 	while (i < TABLE_SIZE) {
167 		derived_table[i] = derived_table[i - 1] + inc * 100;
168 		i++;
169 	}
170 
171 	return 0;
172 }
173 
174 struct k3_thermal_data;
175 
176 struct k3_j72xx_bandgap {
177 	struct device *dev;
178 	void __iomem *base;
179 	void __iomem *cfg2_base;
180 	struct k3_thermal_data *ts_data[K3_VTM_MAX_NUM_TS];
181 	int cnt;
182 };
183 
184 /* common data structures */
185 struct k3_thermal_data {
186 	struct k3_j72xx_bandgap *bgp;
187 	u32 ctrl_offset;
188 	u32 stat_offset;
189 };
190 
two_cmp(int tmp,int mask)191 static int two_cmp(int tmp, int mask)
192 {
193 	tmp = ~(tmp);
194 	tmp &= mask;
195 	tmp += 1;
196 
197 	/* Return negative value */
198 	return (0 - tmp);
199 }
200 
vtm_get_best_value(unsigned int s0,unsigned int s1,unsigned int s2)201 static unsigned int vtm_get_best_value(unsigned int s0, unsigned int s1,
202 				       unsigned int s2)
203 {
204 	int d01 = abs(s0 - s1);
205 	int d02 = abs(s0 - s2);
206 	int d12 = abs(s1 - s2);
207 
208 	if (d01 <= d02 && d01 <= d12)
209 		return (s0 + s1) / 2;
210 
211 	if (d02 <= d01 && d02 <= d12)
212 		return (s0 + s2) / 2;
213 
214 	return (s1 + s2) / 2;
215 }
216 
k3_bgp_read_temp(struct k3_thermal_data * devdata,int * temp)217 static inline int k3_bgp_read_temp(struct k3_thermal_data *devdata,
218 				   int *temp)
219 {
220 	struct k3_j72xx_bandgap *bgp;
221 	unsigned int dtemp, s0, s1, s2;
222 
223 	bgp = devdata->bgp;
224 	/*
225 	 * Errata is applicable for am654 pg 1.0 silicon/J7ES. There
226 	 * is a variation of the order for certain degree centigrade on AM654.
227 	 * Work around that by getting the average of two closest
228 	 * readings out of three readings everytime we want to
229 	 * report temperatures.
230 	 *
231 	 * Errata workaround.
232 	 */
233 	s0 = readl(bgp->base + devdata->stat_offset) &
234 		K3_VTM_TS_STAT_DTEMP_MASK;
235 	s1 = readl(bgp->base + devdata->stat_offset) &
236 		K3_VTM_TS_STAT_DTEMP_MASK;
237 	s2 = readl(bgp->base + devdata->stat_offset) &
238 		K3_VTM_TS_STAT_DTEMP_MASK;
239 	dtemp = vtm_get_best_value(s0, s1, s2);
240 
241 	if (dtemp < 0 || dtemp >= TABLE_SIZE)
242 		return -EINVAL;
243 
244 	*temp = derived_table[dtemp];
245 
246 	return 0;
247 }
248 
249 /* Get temperature callback function for thermal zone */
k3_thermal_get_temp(struct thermal_zone_device * tz,int * temp)250 static int k3_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
251 {
252 	return k3_bgp_read_temp(thermal_zone_device_priv(tz), temp);
253 }
254 
255 static const struct thermal_zone_device_ops k3_of_thermal_ops = {
256 	.get_temp = k3_thermal_get_temp,
257 };
258 
k3_j72xx_bandgap_temp_to_adc_code(int temp)259 static int k3_j72xx_bandgap_temp_to_adc_code(int temp)
260 {
261 	int low = 0, high = TABLE_SIZE - 1, mid;
262 
263 	if (temp > 160000 || temp < -50000)
264 		return -EINVAL;
265 
266 	/* Binary search to find the adc code */
267 	while (low < (high - 1)) {
268 		mid = (low + high) / 2;
269 		if (temp <= derived_table[mid])
270 			high = mid;
271 		else
272 			low = mid;
273 	}
274 
275 	return mid;
276 }
277 
get_efuse_values(int id,struct k3_thermal_data * data,int * err,void __iomem * fuse_base)278 static void get_efuse_values(int id, struct k3_thermal_data *data, int *err,
279 			     void __iomem *fuse_base)
280 {
281 	int i, tmp, pow;
282 	int ct_offsets[5][K3_VTM_CORRECTION_TEMP_CNT] = {
283 		{ 0x0, 0x8, 0x4 },
284 		{ 0x0, 0x8, 0x4 },
285 		{ 0x0, -1,  0x4 },
286 		{ 0x0, 0xC, -1 },
287 		{ 0x0, 0xc, 0x8 }
288 	};
289 	int ct_bm[5][K3_VTM_CORRECTION_TEMP_CNT] = {
290 		{ 0x3f, 0x1fe000, 0x1ff },
291 		{ 0xfc0, 0x1fe000, 0x3fe00 },
292 		{ 0x3f000, 0x7f800000, 0x7fc0000 },
293 		{ 0xfc0000, 0x1fe0, 0x1f800000 },
294 		{ 0x3f000000, 0x1fe000, 0x1ff0 }
295 	};
296 
297 	for (i = 0; i < 3; i++) {
298 		/* Extract the offset value using bit-mask */
299 		if (ct_offsets[id][i] == -1 && i == 1) {
300 			/* 25C offset Case of Sensor 2 split between 2 regs */
301 			tmp = (readl(fuse_base + 0x8) & 0xE0000000) >> (29);
302 			tmp |= ((readl(fuse_base + 0xC) & 0x1F) << 3);
303 			pow = tmp & 0x80;
304 		} else if (ct_offsets[id][i] == -1 && i == 2) {
305 			/* 125C Case of Sensor 3 split between 2 regs */
306 			tmp = (readl(fuse_base + 0x4) & 0xF8000000) >> (27);
307 			tmp |= ((readl(fuse_base + 0x8) & 0xF) << 5);
308 			pow = tmp & 0x100;
309 		} else {
310 			tmp = readl(fuse_base + ct_offsets[id][i]);
311 			tmp &= ct_bm[id][i];
312 			tmp = tmp >> __ffs(ct_bm[id][i]);
313 
314 			/* Obtain the sign bit pow*/
315 			pow = ct_bm[id][i] >> __ffs(ct_bm[id][i]);
316 			pow += 1;
317 			pow /= 2;
318 		}
319 
320 		/* Check for negative value */
321 		if (tmp & pow) {
322 			/* 2's complement value */
323 			tmp = two_cmp(tmp, ct_bm[id][i] >> __ffs(ct_bm[id][i]));
324 		}
325 		err[i] = tmp;
326 	}
327 
328 	/* Err value for 150C is set to 0 */
329 	err[i] = 0;
330 }
331 
print_look_up_table(struct device * dev,int * ref_table)332 static void print_look_up_table(struct device *dev, int *ref_table)
333 {
334 	int i;
335 
336 	dev_dbg(dev, "The contents of derived array\n");
337 	dev_dbg(dev, "Code   Temperature\n");
338 	for (i = 0; i < TABLE_SIZE; i++)
339 		dev_dbg(dev, "%d       %d %d\n", i, derived_table[i], ref_table[i]);
340 }
341 
k3_j72xx_bandgap_init_hw(struct k3_j72xx_bandgap * bgp)342 static void k3_j72xx_bandgap_init_hw(struct k3_j72xx_bandgap *bgp)
343 {
344 	struct k3_thermal_data *data;
345 	int id, high_max, low_temp;
346 	u32 val;
347 
348 	for (id = 0; id < bgp->cnt; id++) {
349 		data = bgp->ts_data[id];
350 		val = readl(bgp->cfg2_base + data->ctrl_offset);
351 		val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN |
352 			K3_VTM_TMPSENS_CTRL_SOC |
353 			K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4));
354 		writel(val, bgp->cfg2_base + data->ctrl_offset);
355 	}
356 
357 	/*
358 	 * Program TSHUT thresholds
359 	 * Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2
360 	 * Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN  bit
361 	 *         This is already taken care as per of init
362 	 * Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN  bit
363 	 */
364 	high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP);
365 	low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP);
366 
367 	writel((low_temp << 16) | high_max, bgp->cfg2_base + K3_VTM_MISC_CTRL2_OFFSET);
368 	writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, bgp->cfg2_base + K3_VTM_MISC_CTRL_OFFSET);
369 }
370 
371 struct k3_j72xx_bandgap_data {
372 	const bool has_errata_i2128;
373 };
374 
k3_j72xx_bandgap_probe(struct platform_device * pdev)375 static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
376 {
377 	const struct k3_j72xx_bandgap_data *driver_data;
378 	struct thermal_zone_device *ti_thermal;
379 	struct device *dev = &pdev->dev;
380 	bool workaround_needed = false;
381 	struct k3_j72xx_bandgap *bgp;
382 	struct k3_thermal_data *data;
383 	struct err_values err_vals;
384 	void __iomem *fuse_base;
385 	int ret = 0, val, id;
386 	struct resource *res;
387 	int *ref_table;
388 
389 	const s64 golden_factors[] = {
390 		-490019999999999936,
391 		3251200000000000,
392 		-1705800000000,
393 		603730000,
394 		-92627,
395 	};
396 
397 	const s64 pvt_wa_factors[] = {
398 		-415230000000000000,
399 		3126600000000000,
400 		-1157800000000,
401 	};
402 
403 	bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
404 	if (!bgp)
405 		return -ENOMEM;
406 
407 	bgp->dev = dev;
408 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
409 	bgp->base = devm_ioremap_resource(dev, res);
410 	if (IS_ERR(bgp->base))
411 		return PTR_ERR(bgp->base);
412 
413 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
414 	bgp->cfg2_base = devm_ioremap_resource(dev, res);
415 	if (IS_ERR(bgp->cfg2_base))
416 		return PTR_ERR(bgp->cfg2_base);
417 
418 	driver_data = of_device_get_match_data(dev);
419 	if (driver_data)
420 		workaround_needed = driver_data->has_errata_i2128;
421 
422 	/*
423 	 * Some of TI's J721E SoCs require a software trimming procedure
424 	 * for the temperature monitors to function properly. To determine
425 	 * if this particular SoC is NOT affected, both bits in the
426 	 * WKUP_SPARE_FUSE0[31:30] will be set (0xC0000000) indicating
427 	 * when software trimming should NOT be applied.
428 	 *
429 	 * https://www.ti.com/lit/er/sprz455c/sprz455c.pdf
430 	 */
431 	if (workaround_needed) {
432 		res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
433 		fuse_base = devm_ioremap_resource(dev, res);
434 		if (IS_ERR(fuse_base))
435 			return PTR_ERR(fuse_base);
436 
437 		if ((readl(fuse_base) & 0xc0000000) == 0xc0000000)
438 			workaround_needed = false;
439 	}
440 
441 	dev_dbg(bgp->dev, "Work around %sneeded\n",
442 		workaround_needed ? "" : "not ");
443 
444 	pm_runtime_enable(dev);
445 	ret = pm_runtime_get_sync(dev);
446 	if (ret < 0) {
447 		pm_runtime_put_noidle(dev);
448 		pm_runtime_disable(dev);
449 		return ret;
450 	}
451 
452 	/* Get the sensor count in the VTM */
453 	val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET);
454 	bgp->cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
455 	bgp->cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
456 
457 	data = devm_kcalloc(bgp->dev, bgp->cnt, sizeof(*data), GFP_KERNEL);
458 	if (!data) {
459 		ret = -ENOMEM;
460 		goto err_alloc;
461 	}
462 
463 	ref_table = kzalloc(sizeof(*ref_table) * TABLE_SIZE, GFP_KERNEL);
464 	if (!ref_table) {
465 		ret = -ENOMEM;
466 		goto err_alloc;
467 	}
468 
469 	derived_table = devm_kzalloc(bgp->dev, sizeof(*derived_table) * TABLE_SIZE,
470 				     GFP_KERNEL);
471 	if (!derived_table) {
472 		ret = -ENOMEM;
473 		goto err_free_ref_table;
474 	}
475 
476 	if (!workaround_needed)
477 		init_table(5, ref_table, golden_factors);
478 	else
479 		init_table(3, ref_table, pvt_wa_factors);
480 
481 	/* Precompute the derived table & fill each thermal sensor struct */
482 	for (id = 0; id < bgp->cnt; id++) {
483 		data[id].bgp = bgp;
484 		data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET + id * 0x20;
485 		data[id].stat_offset = data[id].ctrl_offset +
486 					K3_VTM_TMPSENS_STAT_OFFSET;
487 
488 		if (workaround_needed) {
489 			/* ref adc values for -40C, 30C & 125C respectively */
490 			err_vals.refs[0] = MINUS40CREF;
491 			err_vals.refs[1] = PLUS30CREF;
492 			err_vals.refs[2] = PLUS125CREF;
493 			err_vals.refs[3] = PLUS150CREF;
494 			get_efuse_values(id, &data[id], err_vals.errs, fuse_base);
495 		}
496 
497 		if (id == 0 && workaround_needed)
498 			prep_lookup_table(&err_vals, ref_table);
499 		else if (id == 0 && !workaround_needed)
500 			memcpy(derived_table, ref_table, TABLE_SIZE * 4);
501 
502 		bgp->ts_data[id] = &data[id];
503 	}
504 
505 	k3_j72xx_bandgap_init_hw(bgp);
506 
507 	/* Register the thermal sensors */
508 	for (id = 0; id < bgp->cnt; id++) {
509 		ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, &data[id],
510 							   &k3_of_thermal_ops);
511 		if (IS_ERR(ti_thermal)) {
512 			dev_err(bgp->dev, "thermal zone device is NULL\n");
513 			ret = PTR_ERR(ti_thermal);
514 			goto err_free_ref_table;
515 		}
516 	}
517 
518 	platform_set_drvdata(pdev, bgp);
519 
520 	print_look_up_table(dev, ref_table);
521 	/*
522 	 * Now that the derived_table has the appropriate look up values
523 	 * Free up the ref_table
524 	 */
525 	kfree(ref_table);
526 
527 	return 0;
528 
529 err_free_ref_table:
530 	kfree(ref_table);
531 
532 err_alloc:
533 	pm_runtime_put_sync(&pdev->dev);
534 	pm_runtime_disable(&pdev->dev);
535 
536 	return ret;
537 }
538 
k3_j72xx_bandgap_remove(struct platform_device * pdev)539 static void k3_j72xx_bandgap_remove(struct platform_device *pdev)
540 {
541 	pm_runtime_put_sync(&pdev->dev);
542 	pm_runtime_disable(&pdev->dev);
543 }
544 
k3_j72xx_bandgap_suspend(struct device * dev)545 static int k3_j72xx_bandgap_suspend(struct device *dev)
546 {
547 	pm_runtime_put_sync(dev);
548 	pm_runtime_disable(dev);
549 	return 0;
550 }
551 
k3_j72xx_bandgap_resume(struct device * dev)552 static int k3_j72xx_bandgap_resume(struct device *dev)
553 {
554 	struct k3_j72xx_bandgap *bgp = dev_get_drvdata(dev);
555 	int ret;
556 
557 	pm_runtime_enable(dev);
558 	ret = pm_runtime_get_sync(dev);
559 	if (ret < 0) {
560 		pm_runtime_put_noidle(dev);
561 		pm_runtime_disable(dev);
562 		return ret;
563 	}
564 
565 	k3_j72xx_bandgap_init_hw(bgp);
566 
567 	return 0;
568 }
569 
570 static DEFINE_SIMPLE_DEV_PM_OPS(k3_j72xx_bandgap_pm_ops,
571 				k3_j72xx_bandgap_suspend,
572 				k3_j72xx_bandgap_resume);
573 
574 static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j721e_data = {
575 	.has_errata_i2128 = true,
576 };
577 
578 static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j7200_data = {
579 	.has_errata_i2128 = false,
580 };
581 
582 static const struct of_device_id of_k3_j72xx_bandgap_match[] = {
583 	{
584 		.compatible = "ti,j721e-vtm",
585 		.data = &k3_j72xx_bandgap_j721e_data,
586 	},
587 	{
588 		.compatible = "ti,j7200-vtm",
589 		.data = &k3_j72xx_bandgap_j7200_data,
590 	},
591 	{ /* sentinel */ },
592 };
593 MODULE_DEVICE_TABLE(of, of_k3_j72xx_bandgap_match);
594 
595 static struct platform_driver k3_j72xx_bandgap_sensor_driver = {
596 	.probe = k3_j72xx_bandgap_probe,
597 	.remove_new = k3_j72xx_bandgap_remove,
598 	.driver = {
599 		.name = "k3-j72xx-soc-thermal",
600 		.of_match_table	= of_k3_j72xx_bandgap_match,
601 		.pm = pm_sleep_ptr(&k3_j72xx_bandgap_pm_ops),
602 	},
603 };
604 
605 module_platform_driver(k3_j72xx_bandgap_sensor_driver);
606 
607 MODULE_DESCRIPTION("K3 bandgap temperature sensor driver");
608 MODULE_LICENSE("GPL");
609 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
610