1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
4 //
5 // Supported Part Numbers:
6 // FAN53555UC00X/01X/03X/04X/05X
7 //
8 // Copyright (c) 2012 Marvell Technology Ltd.
9 // Yunfan Zhang <yfzhang@marvell.com>
10
11 #include <linux/module.h>
12 #include <linux/param.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/of_device.h>
19 #include <linux/i2c.h>
20 #include <linux/slab.h>
21 #include <linux/regmap.h>
22 #include <linux/regulator/fan53555.h>
23 #include <linux/gpio.h>
24 #include <linux/of_gpio.h>
25
26 /* Voltage setting */
27 #define FAN53555_VSEL0 0x00
28 #define FAN53555_VSEL1 0x01
29
30 #define RK860X_VSEL0 0x06
31 #define RK860X_VSEL1 0x07
32 #define RK860X_MAX_SET 0x08
33
34 #define TCS452X_VSEL0 0x11
35 #define TCS452X_VSEL1 0x10
36 #define TCS452X_TIME 0x13
37 #define TCS452X_COMMAND 0x14
38 #define TCS452X_LIMCONF 0x16
39
40 /* Control register */
41 #define FAN53555_CONTROL 0x02
42 /* IC Type */
43 #define FAN53555_ID1 0x03
44 /* IC mask version */
45 #define FAN53555_ID2 0x04
46 /* Monitor register */
47 #define FAN53555_MONITOR 0x05
48
49 /* VSEL bit definitions */
50 #define VSEL_BUCK_EN (1 << 7)
51 #define VSEL_MODE (1 << 6)
52 #define VSEL_NSEL_MASK 0x3F
53 /* Chip ID and Verison */
54 #define DIE_ID 0x0F /* ID1 */
55 #define DIE_REV 0x0F /* ID2 */
56 /* Control bit definitions */
57 #define CTL_OUTPUT_DISCHG (1 << 7)
58 #define CTL_SLEW_MASK (0x7 << 4)
59 #define CTL_SLEW_SHIFT 4
60 #define CTL_RESET (1 << 2)
61 #define CTL_MODE_VSEL0_MODE BIT(0)
62 #define CTL_MODE_VSEL1_MODE BIT(1)
63
64 #define RK_VSEL_NSEL_MASK 0xff
65
66 #define TCS_VSEL_NSEL_MASK 0x7f
67 #define TCS_VSEL0_MODE (1 << 7)
68 #define TCS_VSEL1_MODE (1 << 6)
69
70 #define TCS_SLEW_SHIFT 3
71 #define TCS_SLEW_MASK (0x3 < 3)
72
73 #define FAN53555_NVOLTAGES_64 64 /* Numbers of voltages */
74 #define FAN53555_NVOLTAGES_127 127 /* Numbers of voltages */
75 #define FAN53555_NVOLTAGES_160 160 /* Numbers of voltages */
76
77 #define FAN53555_VOLTAGE_MIN_A 600000 /* min of voltage range */
78 #define FAN53555_VOLTAGE_MIN_B 800000 /* min of voltage range */
79 #define FAN53555_VOLTAGE_MIN_C 603000 /* min of voltage range */
80 #define FAN53555_VOLTAGE_MIN_D 500000 /* min of voltage range */
81 #define FAN53555_VOLTAGE_MIN_E 712500 /* min of voltage range */
82 #define FAN53555_VOLTAGE_STEP_A 6250 /* step of voltage range */
83 #define FAN53555_VOLTAGE_STEP_B 10000 /* step of voltage range */
84 #define FAN53555_VOLTAGE_STEP_C 12826 /* step of voltage range */
85 #define FAN53555_VOLTAGE_STEP_D 12500 /* step of voltage range */
86 #define FAN53555_VOLTAGE_LIMIT_A 1500000 /* limit of voltage range */
87 #define FAN53555_ENABLE_TIME_A 400 /* enable time */
88
89 enum fan53555_vendor {
90 FAN53526_VENDOR_FAIRCHILD = 0,
91 FAN53555_VENDOR_FAIRCHILD,
92 FAN53555_VENDOR_RK,
93 FAN53555_VENDOR_SILERGY,
94 FAN53555_VENDOR_TCS,
95 };
96
97 enum {
98 FAN53526_CHIP_ID_01 = 1,
99 };
100
101 enum {
102 FAN53526_CHIP_REV_08 = 8,
103 };
104
105 /* IC Type */
106 enum {
107 FAN53555_CHIP_ID_00 = 0,
108 FAN53555_CHIP_ID_01,
109 FAN53555_CHIP_ID_02,
110 FAN53555_CHIP_ID_03,
111 FAN53555_CHIP_ID_04,
112 FAN53555_CHIP_ID_05,
113 FAN53555_CHIP_ID_08 = 8,
114 };
115
116 /* IC mask revision */
117 enum {
118 FAN53555_CHIP_REV_00 = 0x3,
119 FAN53555_CHIP_REV_13 = 0xf,
120 };
121
122 enum {
123 SILERGY_SYR82X = 8,
124 SILERGY_SYR83X = 9,
125 };
126
127 struct fan53555_device_info {
128 enum fan53555_vendor vendor;
129 struct regmap *regmap;
130 struct device *dev;
131 struct regulator_desc desc;
132 struct regulator_dev *rdev;
133 struct regulator_init_data *regulator;
134 /* IC Type and Rev */
135 int chip_id;
136 int chip_rev;
137 /* Voltage setting register */
138 unsigned int vol_reg;
139 unsigned int sleep_reg;
140 unsigned int en_reg;
141 unsigned int sleep_en_reg;
142 unsigned int mode_reg;
143 unsigned int vol_mask;
144 unsigned int mode_mask;
145 unsigned int slew_reg;
146 unsigned int slew_mask;
147 unsigned int slew_shift;
148 /* Voltage range and step(linear) */
149 unsigned int vsel_min;
150 unsigned int vsel_step;
151 unsigned int n_voltages;
152 /* Voltage slew rate limiting */
153 unsigned int slew_rate;
154 /* Sleep voltage cache */
155 unsigned int sleep_vol_cache;
156 struct gpio_desc *vsel_gpio;
157 unsigned int sleep_vsel_id;
158 };
159
fan53555_map_mode(unsigned int mode)160 static unsigned int fan53555_map_mode(unsigned int mode)
161 {
162 return mode == REGULATOR_MODE_FAST ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
163 }
164
fan53555_get_voltage(struct regulator_dev * rdev)165 static int fan53555_get_voltage(struct regulator_dev *rdev)
166 {
167 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
168 unsigned int val;
169 int ret;
170
171 if (di->vendor == FAN53555_VENDOR_RK) {
172 ret = regmap_read(di->regmap, RK860X_MAX_SET, &val);
173 if (ret < 0) {
174 return ret;
175 }
176 ret = regulator_get_voltage_sel_regmap(rdev);
177 if (ret > val) {
178 return val;
179 }
180 } else {
181 ret = regulator_get_voltage_sel_regmap(rdev);
182 }
183
184 return ret;
185 }
186
fan53555_set_suspend_voltage(struct regulator_dev * rdev,int uV)187 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
188 {
189 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
190 int ret;
191
192 if (di->sleep_vol_cache == uV) {
193 return 0;
194 }
195 ret = regulator_map_voltage_linear(rdev, uV, uV);
196 if (ret < 0) {
197 return ret;
198 }
199 ret = regmap_update_bits(di->regmap, di->sleep_reg, di->vol_mask, ret);
200 if (ret < 0) {
201 return ret;
202 }
203 /* Cache the sleep voltage setting.
204 * Might not be the real voltage which is rounded */
205 di->sleep_vol_cache = uV;
206
207 return 0;
208 }
209
fan53555_set_suspend_enable(struct regulator_dev * rdev)210 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
211 {
212 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
213
214 return regmap_update_bits(di->regmap, di->sleep_en_reg, VSEL_BUCK_EN, VSEL_BUCK_EN);
215 }
216
fan53555_set_suspend_disable(struct regulator_dev * rdev)217 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
218 {
219 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
220
221 return regmap_update_bits(di->regmap, di->sleep_en_reg, VSEL_BUCK_EN, 0);
222 }
223
fan53555_set_enable(struct regulator_dev * rdev)224 static int fan53555_set_enable(struct regulator_dev *rdev)
225 {
226 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
227
228 if (di->vsel_gpio) {
229 gpiod_set_raw_value(di->vsel_gpio, !di->sleep_vsel_id);
230 return 0;
231 }
232
233 return regmap_update_bits(di->regmap, di->en_reg, VSEL_BUCK_EN, VSEL_BUCK_EN);
234 }
235
fan53555_set_disable(struct regulator_dev * rdev)236 static int fan53555_set_disable(struct regulator_dev *rdev)
237 {
238 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
239
240 if (di->vsel_gpio) {
241 gpiod_set_raw_value(di->vsel_gpio, di->sleep_vsel_id);
242 return 0;
243 }
244
245 return regmap_update_bits(di->regmap, di->en_reg, VSEL_BUCK_EN, 0);
246 }
247
fan53555_is_enabled(struct regulator_dev * rdev)248 static int fan53555_is_enabled(struct regulator_dev *rdev)
249 {
250 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
251 unsigned int val;
252 int ret = 0;
253
254 if (di->vsel_gpio) {
255 if (di->sleep_vsel_id) {
256 return !gpiod_get_raw_value(di->vsel_gpio);
257 } else {
258 return gpiod_get_raw_value(di->vsel_gpio);
259 }
260 }
261
262 ret = regmap_read(di->regmap, di->en_reg, &val);
263 if (ret < 0) {
264 return ret;
265 }
266 if (val & VSEL_BUCK_EN) {
267 return 1;
268 } else {
269 return 0;
270 }
271 }
272
fan53555_set_mode(struct regulator_dev * rdev,unsigned int mode)273 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
274 {
275 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
276
277 switch (mode) {
278 case REGULATOR_MODE_FAST:
279 regmap_update_bits(di->regmap, di->mode_reg, di->mode_mask, di->mode_mask);
280 break;
281 case REGULATOR_MODE_NORMAL:
282 regmap_update_bits(di->regmap, di->mode_reg, di->mode_mask, 0);
283 break;
284 default:
285 return -EINVAL;
286 }
287 return 0;
288 }
289
fan53555_get_mode(struct regulator_dev * rdev)290 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
291 {
292 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
293 unsigned int val;
294 int ret = 0;
295
296 ret = regmap_read(di->regmap, di->mode_reg, &val);
297 if (ret < 0) {
298 return ret;
299 }
300 if (val & di->mode_mask) {
301 return REGULATOR_MODE_FAST;
302 } else {
303 return REGULATOR_MODE_NORMAL;
304 }
305 }
306
307 static const int slew_rates[] = {
308 64000, 32000, 16000, 8000, 4000, 2000, 1000, 500,
309 };
310
311 static const int tcs_slew_rates[] = {
312 18700,
313 9300,
314 4600,
315 2300,
316 };
317
fan53555_set_ramp(struct regulator_dev * rdev,int ramp)318 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
319 {
320 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
321 int regval = -1, i;
322 const int *slew_rate_t;
323 int slew_rate_n;
324
325 switch (di->vendor) {
326 case FAN53555_VENDOR_FAIRCHILD:
327 case FAN53555_VENDOR_RK:
328 case FAN53555_VENDOR_SILERGY:
329 slew_rate_t = slew_rates;
330 slew_rate_n = ARRAY_SIZE(slew_rates);
331 break;
332 case FAN53555_VENDOR_TCS:
333 slew_rate_t = tcs_slew_rates;
334 slew_rate_n = ARRAY_SIZE(tcs_slew_rates);
335 break;
336 default:
337 return -EINVAL;
338 }
339
340 for (i = 0; i < slew_rate_n; i++) {
341 if (ramp <= slew_rate_t[i]) {
342 regval = i;
343 } else {
344 break;
345 }
346 }
347
348 if (regval < 0) {
349 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
350 return -EINVAL;
351 }
352
353 return regmap_update_bits(di->regmap, di->slew_reg, di->slew_mask, regval << di->slew_shift);
354 }
355
356 static const struct regulator_ops fan53555_regulator_ops = {
357 .set_voltage_sel = regulator_set_voltage_sel_regmap,
358 .get_voltage_sel = fan53555_get_voltage,
359 .set_voltage_time_sel = regulator_set_voltage_time_sel,
360 .map_voltage = regulator_map_voltage_linear,
361 .list_voltage = regulator_list_voltage_linear,
362 .set_suspend_voltage = fan53555_set_suspend_voltage,
363 .enable = fan53555_set_enable,
364 .disable = fan53555_set_disable,
365 .is_enabled = fan53555_is_enabled,
366 .set_mode = fan53555_set_mode,
367 .get_mode = fan53555_get_mode,
368 .set_ramp_delay = fan53555_set_ramp,
369 .set_suspend_enable = fan53555_set_suspend_enable,
370 .set_suspend_disable = fan53555_set_suspend_disable,
371 };
372
fan53526_voltages_setup_fairchild(struct fan53555_device_info * di)373 static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
374 {
375 /* Init voltage range and step */
376 switch (di->chip_id) {
377 case FAN53526_CHIP_ID_01:
378 switch (di->chip_rev) {
379 case FAN53526_CHIP_REV_08:
380 di->vsel_min = FAN53555_VOLTAGE_MIN_A;
381 di->vsel_step = FAN53555_VOLTAGE_STEP_A;
382 break;
383 default:
384 dev_err(di->dev, "Chip ID %d with rev %d not supported!\n", di->chip_id, di->chip_rev);
385 return -EINVAL;
386 }
387 break;
388 default:
389 dev_err(di->dev, "Chip ID %d not supported!\n", di->chip_id);
390 return -EINVAL;
391 }
392
393 di->n_voltages = FAN53555_NVOLTAGES_64;
394
395 return 0;
396 }
397
fan53555_voltages_setup_fairchild(struct fan53555_device_info * di)398 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
399 {
400 /* Init voltage range and step */
401 switch (di->chip_id) {
402 case FAN53555_CHIP_ID_00:
403 switch (di->chip_rev) {
404 case FAN53555_CHIP_REV_00:
405 di->vsel_min = FAN53555_VOLTAGE_MIN_A;
406 di->vsel_step = FAN53555_VOLTAGE_STEP_B;
407 break;
408 case FAN53555_CHIP_REV_13:
409 di->vsel_min = FAN53555_VOLTAGE_MIN_B;
410 di->vsel_step = FAN53555_VOLTAGE_STEP_B;
411 break;
412 default:
413 dev_err(di->dev, "Chip ID %d with rev %d not supported!\n", di->chip_id, di->chip_rev);
414 return -EINVAL;
415 }
416 break;
417 case FAN53555_CHIP_ID_01:
418 case FAN53555_CHIP_ID_03:
419 case FAN53555_CHIP_ID_05:
420 case FAN53555_CHIP_ID_08:
421 di->vsel_min = FAN53555_VOLTAGE_MIN_A;
422 di->vsel_step = FAN53555_VOLTAGE_STEP_B;
423 break;
424 case FAN53555_CHIP_ID_04:
425 di->vsel_min = FAN53555_VOLTAGE_MIN_C;
426 di->vsel_step = FAN53555_VOLTAGE_STEP_C;
427 break;
428 default:
429 dev_err(di->dev, "Chip ID %d not supported!\n", di->chip_id);
430 return -EINVAL;
431 }
432 di->vol_mask = VSEL_NSEL_MASK;
433 di->mode_reg = di->vol_reg;
434 di->mode_mask = VSEL_MODE;
435 di->slew_reg = FAN53555_CONTROL;
436 di->slew_mask = CTL_SLEW_MASK;
437 di->slew_shift = CTL_SLEW_SHIFT;
438 di->n_voltages = FAN53555_NVOLTAGES_64;
439
440 return 0;
441 }
442
fan53555_voltages_setup_rk(struct fan53555_device_info * di,struct fan53555_platform_data * pdata)443 static int fan53555_voltages_setup_rk(struct fan53555_device_info *di, struct fan53555_platform_data *pdata)
444 {
445 int ret = 0, val;
446
447 if (di->sleep_vsel_id) {
448 di->sleep_reg = RK860X_VSEL1;
449 di->vol_reg = RK860X_VSEL0;
450 di->mode_reg = FAN53555_VSEL0;
451 di->en_reg = FAN53555_VSEL0;
452 di->sleep_en_reg = FAN53555_VSEL1;
453 } else {
454 di->sleep_reg = RK860X_VSEL0;
455 di->vol_reg = RK860X_VSEL1;
456 di->mode_reg = FAN53555_VSEL1;
457 di->en_reg = FAN53555_VSEL1;
458 di->sleep_en_reg = FAN53555_VSEL0;
459 }
460
461 di->mode_mask = VSEL_MODE;
462 di->vol_mask = RK_VSEL_NSEL_MASK;
463 di->slew_reg = FAN53555_CONTROL;
464 di->slew_mask = CTL_SLEW_MASK;
465 di->slew_shift = CTL_SLEW_SHIFT;
466
467 /* Init voltage range and step */
468 di->vsel_min = FAN53555_VOLTAGE_MIN_D;
469 di->vsel_step = FAN53555_VOLTAGE_STEP_A;
470 di->n_voltages = FAN53555_NVOLTAGES_160;
471
472 if (pdata->limit_volt) {
473 if (pdata->limit_volt < di->vsel_min || pdata->limit_volt > FAN53555_VOLTAGE_LIMIT_A) {
474 pdata->limit_volt = FAN53555_VOLTAGE_LIMIT_A;
475 }
476 val = (pdata->limit_volt - di->vsel_min) / di->vsel_step;
477 ret = regmap_write(di->regmap, RK860X_MAX_SET, val);
478 if (ret < 0) {
479 dev_err(di->dev, "Failed to set limit voltage!\n");
480 return ret;
481 }
482 }
483
484 return 0;
485 }
486
fan53555_voltages_setup_silergy(struct fan53555_device_info * di)487 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
488 {
489 /* Init voltage range and step */
490 switch (di->chip_id) {
491 case SILERGY_SYR82X:
492 case SILERGY_SYR83X:
493 di->vsel_min = FAN53555_VOLTAGE_MIN_E;
494 di->vsel_step = FAN53555_VOLTAGE_STEP_D;
495 break;
496 default:
497 dev_err(di->dev, "Chip ID %d not supported!\n", di->chip_id);
498 return -EINVAL;
499 }
500 di->vol_mask = VSEL_NSEL_MASK;
501 di->mode_reg = di->vol_reg;
502 di->mode_mask = VSEL_MODE;
503 di->slew_reg = FAN53555_CONTROL;
504 di->slew_reg = FAN53555_CONTROL;
505 di->slew_mask = CTL_SLEW_MASK;
506 di->slew_shift = CTL_SLEW_SHIFT;
507 di->n_voltages = FAN53555_NVOLTAGES_64;
508
509 return 0;
510 }
511
fan53555_voltages_setup_tcs(struct fan53555_device_info * di)512 static int fan53555_voltages_setup_tcs(struct fan53555_device_info *di)
513 {
514 if (di->sleep_vsel_id) {
515 di->sleep_reg = TCS452X_VSEL1;
516 di->vol_reg = TCS452X_VSEL0;
517 di->mode_mask = TCS_VSEL0_MODE;
518 } else {
519 di->sleep_reg = TCS452X_VSEL0;
520 di->vol_reg = TCS452X_VSEL1;
521 di->mode_mask = TCS_VSEL1_MODE;
522 }
523
524 di->mode_reg = TCS452X_COMMAND;
525 di->vol_mask = TCS_VSEL_NSEL_MASK;
526 di->slew_reg = TCS452X_TIME;
527 di->slew_mask = TCS_SLEW_MASK;
528 di->slew_shift = TCS_SLEW_MASK;
529
530 /* Init voltage range and step */
531 di->vsel_min = FAN53555_VOLTAGE_MIN_A;
532 di->vsel_step = FAN53555_VOLTAGE_STEP_A;
533 di->n_voltages = FAN53555_NVOLTAGES_127;
534
535 di->en_reg = di->vol_reg;
536 di->sleep_en_reg = di->sleep_reg;
537
538 return 0;
539 }
540
541 /* For 00,01,03,05 options:
542 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
543 * For 04 option:
544 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
545 * */
fan53555_device_setup(struct fan53555_device_info * di,struct fan53555_platform_data * pdata)546 static int fan53555_device_setup(struct fan53555_device_info *di, struct fan53555_platform_data *pdata)
547 {
548 int ret = 0;
549
550 /* Setup voltage control register */
551 switch (pdata->sleep_vsel_id) {
552 case FAN53555_VSEL_ID_0:
553 di->sleep_reg = FAN53555_VSEL0;
554 di->vol_reg = FAN53555_VSEL1;
555 break;
556 case FAN53555_VSEL_ID_1:
557 di->sleep_reg = FAN53555_VSEL1;
558 di->vol_reg = FAN53555_VSEL0;
559 break;
560 default:
561 dev_err(di->dev, "Invalid VSEL ID!\n");
562 return -EINVAL;
563 }
564
565 di->en_reg = di->vol_reg;
566 di->sleep_en_reg = di->sleep_reg;
567
568 /* Setup voltage range */
569 switch (di->vendor) {
570 case FAN53526_VENDOR_FAIRCHILD:
571 di->mode_reg = FAN53555_CONTROL;
572
573 switch (pdata->sleep_vsel_id) {
574 case FAN53555_VSEL_ID_0:
575 di->mode_mask = CTL_MODE_VSEL1_MODE;
576 break;
577 case FAN53555_VSEL_ID_1:
578 di->mode_mask = CTL_MODE_VSEL0_MODE;
579 break;
580 }
581 ret = fan53526_voltages_setup_fairchild(di);
582 break;
583 case FAN53555_VENDOR_FAIRCHILD:
584 ret = fan53555_voltages_setup_fairchild(di);
585 break;
586 case FAN53555_VENDOR_RK:
587 ret = fan53555_voltages_setup_rk(di, pdata);
588 break;
589 case FAN53555_VENDOR_SILERGY:
590 ret = fan53555_voltages_setup_silergy(di);
591 break;
592 case FAN53555_VENDOR_TCS:
593 ret = fan53555_voltages_setup_tcs(di);
594 break;
595 default:
596 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
597 return -EINVAL;
598 }
599
600 return ret;
601 }
602
fan53555_regulator_register(struct fan53555_device_info * di,struct regulator_config * config)603 static int fan53555_regulator_register(struct fan53555_device_info *di, struct regulator_config *config)
604 {
605 struct regulator_desc *rdesc = &di->desc;
606
607 rdesc->name = "fan53555-reg";
608 rdesc->supply_name = "vin";
609 rdesc->ops = &fan53555_regulator_ops;
610 rdesc->type = REGULATOR_VOLTAGE;
611 rdesc->n_voltages = di->n_voltages;
612 rdesc->enable_reg = di->en_reg;
613 rdesc->enable_mask = VSEL_BUCK_EN;
614 rdesc->min_uV = di->vsel_min;
615 rdesc->uV_step = di->vsel_step;
616 rdesc->vsel_reg = di->vol_reg;
617 rdesc->vsel_mask = di->vol_mask;
618 rdesc->owner = THIS_MODULE;
619 rdesc->enable_time = FAN53555_ENABLE_TIME_A;
620
621 di->rdev = devm_regulator_register(di->dev, &di->desc, config);
622 return PTR_ERR_OR_ZERO(di->rdev);
623 }
624
625 static const struct regmap_config fan53555_regmap_config = {
626 .reg_bits = 8,
627 .val_bits = 8,
628 };
629
fan53555_parse_dt(struct device * dev,struct device_node * np,const struct regulator_desc * desc)630 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev, struct device_node *np,
631 const struct regulator_desc *desc)
632 {
633 struct fan53555_platform_data *pdata;
634 int ret, flag, limit_volt;
635 u32 tmp;
636
637 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
638 if (!pdata) {
639 return NULL;
640 }
641
642 pdata->regulator = of_get_regulator_init_data(dev, np, desc);
643 pdata->regulator->constraints.initial_state = PM_SUSPEND_MEM;
644
645 if (!(of_property_read_u32(np, "limit-microvolt", &limit_volt))) {
646 pdata->limit_volt = limit_volt;
647 }
648
649 ret = of_property_read_u32(np, "fcs,suspend-voltage-selector", &tmp);
650 if (!ret) {
651 pdata->sleep_vsel_id = tmp;
652 }
653
654 if (pdata->sleep_vsel_id) {
655 flag = GPIOD_OUT_LOW;
656 } else {
657 flag = GPIOD_OUT_HIGH;
658 }
659
660 pdata->vsel_gpio = devm_gpiod_get_index_optional(dev, "vsel", 0, flag);
661 if (IS_ERR(pdata->vsel_gpio)) {
662 ret = PTR_ERR(pdata->vsel_gpio);
663 dev_err(dev, "failed to get vesl gpio (%d)\n", ret);
664 pdata->vsel_gpio = NULL;
665 }
666
667 return pdata;
668 }
669
670 static const struct of_device_id __maybe_unused fan53555_dt_ids[] = {
671 {
672 .compatible = "fcs,fan53526",
673 .data = (void *)FAN53526_VENDOR_FAIRCHILD,
674 },
675 {.compatible = "fcs,fan53555", .data = (void *)FAN53555_VENDOR_FAIRCHILD},
676 {
677 .compatible = "rockchip,rk8603",
678 .data = (void *)FAN53555_VENDOR_RK,
679 },
680 {
681 .compatible = "rockchip,rk8604",
682 .data = (void *)FAN53555_VENDOR_RK,
683 },
684 {
685 .compatible = "silergy,syr827",
686 .data = (void *)FAN53555_VENDOR_SILERGY,
687 },
688 {
689 .compatible = "silergy,syr828",
690 .data = (void *)FAN53555_VENDOR_SILERGY,
691 },
692 {.compatible = "tcs,tcs452x", /* tcs4525/4526 */
693 .data = (void *)FAN53555_VENDOR_TCS},
694 {}};
695 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
696
fan53555_regulator_probe(struct i2c_client * client,const struct i2c_device_id * id)697 static int fan53555_regulator_probe(struct i2c_client *client, const struct i2c_device_id *id)
698 {
699 struct device_node *np = client->dev.of_node;
700 struct fan53555_device_info *di;
701 struct fan53555_platform_data *pdata;
702 struct regulator_config config = {};
703 unsigned int val;
704 int ret;
705
706 di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info), GFP_KERNEL);
707 if (!di) {
708 return -ENOMEM;
709 }
710
711 di->desc.of_map_mode = fan53555_map_mode;
712
713 pdata = dev_get_platdata(&client->dev);
714 if (!pdata) {
715 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
716 }
717
718 if (!pdata || !pdata->regulator) {
719 dev_err(&client->dev, "Platform data not found!\n");
720 return -ENODEV;
721 }
722
723 di->vsel_gpio = pdata->vsel_gpio;
724 di->sleep_vsel_id = pdata->sleep_vsel_id;
725
726 di->regulator = pdata->regulator;
727 if (client->dev.of_node) {
728 di->vendor = (unsigned long)of_device_get_match_data(&client->dev);
729 } else {
730 /* if no ramp constraint set, get the pdata ramp_delay */
731 if (!di->regulator->constraints.ramp_delay) {
732 if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
733 dev_err(&client->dev, "Invalid slew_rate\n");
734 return -EINVAL;
735 }
736
737 di->regulator->constraints.ramp_delay = slew_rates[pdata->slew_rate];
738 }
739
740 di->vendor = id->driver_data;
741 }
742
743 di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
744 if (IS_ERR(di->regmap)) {
745 dev_err(&client->dev, "Failed to allocate regmap!\n");
746 return PTR_ERR(di->regmap);
747 }
748 di->dev = &client->dev;
749 i2c_set_clientdata(client, di);
750 /* Get chip ID */
751 ret = regmap_read(di->regmap, FAN53555_ID1, &val);
752 if (ret < 0) {
753 dev_err(&client->dev, "Failed to get chip ID!\n");
754 return ret;
755 }
756 di->chip_id = val & DIE_ID;
757 /* Get chip revision */
758 ret = regmap_read(di->regmap, FAN53555_ID2, &val);
759 if (ret < 0) {
760 dev_err(&client->dev, "Failed to get chip Rev!\n");
761 return ret;
762 }
763 di->chip_rev = val & DIE_REV;
764 dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n", di->chip_id, di->chip_rev);
765 /* Device init */
766 ret = fan53555_device_setup(di, pdata);
767 if (ret < 0) {
768 dev_err(&client->dev, "Failed to setup device!\n");
769 return ret;
770 }
771 /* Register regulator */
772 config.dev = di->dev;
773 config.init_data = di->regulator;
774 config.regmap = di->regmap;
775 config.driver_data = di;
776 config.of_node = np;
777
778 ret = fan53555_regulator_register(di, &config);
779 if (ret < 0) {
780 dev_err(&client->dev, "Failed to register regulator!\n");
781 }
782
783 return ret;
784 }
785
fan53555_regulator_shutdown(struct i2c_client * client)786 static void fan53555_regulator_shutdown(struct i2c_client *client)
787 {
788 struct fan53555_device_info *di;
789 int ret;
790
791 di = i2c_get_clientdata(client);
792
793 dev_info(di->dev, "fan53555..... reset\n");
794
795 switch (di->vendor) {
796 case FAN53555_VENDOR_FAIRCHILD:
797 case FAN53555_VENDOR_RK:
798 case FAN53555_VENDOR_SILERGY:
799 ret = regmap_update_bits(di->regmap, di->slew_reg, CTL_RESET, CTL_RESET);
800 break;
801 case FAN53555_VENDOR_TCS:
802 ret = regmap_update_bits(di->regmap, TCS452X_LIMCONF, CTL_RESET, CTL_RESET);
803 /*
804 * the device can't return 'ack' during the reset,
805 * it will return -ENXIO, ignore this error.
806 */
807 if (ret == -ENXIO) {
808 ret = 0;
809 }
810 break;
811 default:
812 ret = -EINVAL;
813 break;
814 }
815
816 if (ret < 0) {
817 dev_err(di->dev, "reset: force fan53555_reset error! ret=%d\n", ret);
818 } else {
819 dev_info(di->dev, "reset: force fan53555_reset ok!\n");
820 }
821 }
822
823 static const struct i2c_device_id fan53555_id[] = {
824 {.name = "fan53526", .driver_data = FAN53526_VENDOR_FAIRCHILD},
825 {.name = "fan53555", .driver_data = FAN53555_VENDOR_FAIRCHILD},
826 {.name = "rk8603", .driver_data = FAN53555_VENDOR_RK},
827 {.name = "rk8604", .driver_data = FAN53555_VENDOR_RK},
828 {.name = "syr827", .driver_data = FAN53555_VENDOR_SILERGY},
829 {.name = "syr828", .driver_data = FAN53555_VENDOR_SILERGY},
830 {.name = "tcs452x", .driver_data = FAN53555_VENDOR_TCS},
831 {},
832 };
833 MODULE_DEVICE_TABLE(i2c, fan53555_id);
834
835 static struct i2c_driver fan53555_regulator_driver = {
836 .driver =
837 {
838 .name = "fan53555-regulator",
839 .of_match_table = of_match_ptr(fan53555_dt_ids),
840 },
841 .probe = fan53555_regulator_probe,
842 .shutdown = fan53555_regulator_shutdown,
843 .id_table = fan53555_id,
844 };
845
846 module_i2c_driver(fan53555_regulator_driver);
847
848 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
849 MODULE_DESCRIPTION("FAN53555 regulator driver");
850 MODULE_LICENSE("GPL v2");
851