drivers/thermal/hisi_thermal.c

   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(struct thermal_zone_device *tz, int *temp)
 438 {
 439         struct hisi_thermal_sensor *sensor = tz->devdata;
 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_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         temp = data->ops->get_temp(sensor);
 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_of_zone_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");