1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * max8973-regulator.c -- Maxim max8973A |
4 | * |
5 | * Regulator driver for MAXIM 8973A DC-DC step-down switching regulator. |
6 | * |
7 | * Copyright (c) 2012, NVIDIA Corporation. |
8 | * |
9 | * Author: Laxman Dewangan <ldewangan@nvidia.com> |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/err.h> |
16 | #include <linux/of.h> |
17 | #include <linux/of_device.h> |
18 | #include <linux/platform_device.h> |
19 | #include <linux/regulator/driver.h> |
20 | #include <linux/regulator/machine.h> |
21 | #include <linux/regulator/max8973-regulator.h> |
22 | #include <linux/regulator/of_regulator.h> |
23 | #include <linux/gpio.h> |
24 | #include <linux/gpio/consumer.h> |
25 | #include <linux/of_gpio.h> |
26 | #include <linux/i2c.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/regmap.h> |
29 | #include <linux/thermal.h> |
30 | #include <linux/irq.h> |
31 | #include <linux/interrupt.h> |
32 | |
33 | /* Register definitions */ |
34 | #define MAX8973_VOUT 0x0 |
35 | #define MAX8973_VOUT_DVS 0x1 |
36 | #define MAX8973_CONTROL1 0x2 |
37 | #define MAX8973_CONTROL2 0x3 |
38 | #define MAX8973_CHIPID1 0x4 |
39 | #define MAX8973_CHIPID2 0x5 |
40 | |
41 | #define MAX8973_MAX_VOUT_REG 2 |
42 | |
43 | /* MAX8973_VOUT */ |
44 | #define MAX8973_VOUT_ENABLE BIT(7) |
45 | #define MAX8973_VOUT_MASK 0x7F |
46 | |
47 | /* MAX8973_VOUT_DVS */ |
48 | #define MAX8973_DVS_VOUT_MASK 0x7F |
49 | |
50 | /* MAX8973_CONTROL1 */ |
51 | #define MAX8973_SNS_ENABLE BIT(7) |
52 | #define MAX8973_FPWM_EN_M BIT(6) |
53 | #define MAX8973_NFSR_ENABLE BIT(5) |
54 | #define MAX8973_AD_ENABLE BIT(4) |
55 | #define MAX8973_BIAS_ENABLE BIT(3) |
56 | #define MAX8973_FREQSHIFT_9PER BIT(2) |
57 | |
58 | #define MAX8973_RAMP_12mV_PER_US 0x0 |
59 | #define MAX8973_RAMP_25mV_PER_US 0x1 |
60 | #define MAX8973_RAMP_50mV_PER_US 0x2 |
61 | #define MAX8973_RAMP_200mV_PER_US 0x3 |
62 | #define MAX8973_RAMP_MASK 0x3 |
63 | |
64 | /* MAX8973_CONTROL2 */ |
65 | #define MAX8973_WDTMR_ENABLE BIT(6) |
66 | #define MAX8973_DISCH_ENBABLE BIT(5) |
67 | #define MAX8973_FT_ENABLE BIT(4) |
68 | #define MAX77621_T_JUNCTION_120 BIT(7) |
69 | |
70 | #define MAX8973_CKKADV_TRIP_MASK 0xC |
71 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC |
72 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 |
73 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 |
74 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 |
75 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 |
76 | |
77 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 |
78 | #define MAX8973_INDUCTOR_NOMINAL 0x1 |
79 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 |
80 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 |
81 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 |
82 | |
83 | #define MAX8973_MIN_VOLATGE 606250 |
84 | #define MAX8973_MAX_VOLATGE 1400000 |
85 | #define MAX8973_VOLATGE_STEP 6250 |
86 | #define MAX8973_BUCK_N_VOLTAGE 0x80 |
87 | |
88 | #define MAX77621_CHIPID_TJINT_S BIT(0) |
89 | |
90 | #define MAX77621_NORMAL_OPERATING_TEMP 100000 |
91 | #define MAX77621_TJINT_WARNING_TEMP_120 120000 |
92 | #define MAX77621_TJINT_WARNING_TEMP_140 140000 |
93 | |
94 | enum device_id { |
95 | MAX8973, |
96 | MAX77621 |
97 | }; |
98 | |
99 | /* Maxim 8973 chip information */ |
100 | struct max8973_chip { |
101 | struct device *dev; |
102 | struct regulator_desc desc; |
103 | struct regmap *regmap; |
104 | bool enable_external_control; |
105 | int dvs_gpio; |
106 | int lru_index[MAX8973_MAX_VOUT_REG]; |
107 | int curr_vout_val[MAX8973_MAX_VOUT_REG]; |
108 | int curr_vout_reg; |
109 | int curr_gpio_val; |
110 | struct regulator_ops ops; |
111 | enum device_id id; |
112 | int junction_temp_warning; |
113 | int irq; |
114 | struct thermal_zone_device *tz_device; |
115 | }; |
116 | |
117 | /* |
118 | * find_voltage_set_register: Find new voltage configuration register (VOUT). |
119 | * The finding of the new VOUT register will be based on the LRU mechanism. |
120 | * Each VOUT register will have different voltage configured . This |
121 | * Function will look if any of the VOUT register have requested voltage set |
122 | * or not. |
123 | * - If it is already there then it will make that register as most |
124 | * recently used and return as found so that caller need not to set |
125 | * the VOUT register but need to set the proper gpios to select this |
126 | * VOUT register. |
127 | * - If requested voltage is not found then it will use the least |
128 | * recently mechanism to get new VOUT register for new configuration |
129 | * and will return not_found so that caller need to set new VOUT |
130 | * register and then gpios (both). |
131 | */ |
132 | static bool find_voltage_set_register(struct max8973_chip *tps, |
133 | int req_vsel, int *vout_reg, int *gpio_val) |
134 | { |
135 | int i; |
136 | bool found = false; |
137 | int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; |
138 | int found_index = MAX8973_MAX_VOUT_REG - 1; |
139 | |
140 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { |
141 | if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { |
142 | new_vout_reg = tps->lru_index[i]; |
143 | found_index = i; |
144 | found = true; |
145 | goto update_lru_index; |
146 | } |
147 | } |
148 | |
149 | update_lru_index: |
150 | for (i = found_index; i > 0; i--) |
151 | tps->lru_index[i] = tps->lru_index[i - 1]; |
152 | |
153 | tps->lru_index[0] = new_vout_reg; |
154 | *gpio_val = new_vout_reg; |
155 | *vout_reg = MAX8973_VOUT + new_vout_reg; |
156 | return found; |
157 | } |
158 | |
159 | static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) |
160 | { |
161 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
162 | unsigned int data; |
163 | int ret; |
164 | |
165 | ret = regmap_read(map: max->regmap, reg: max->curr_vout_reg, val: &data); |
166 | if (ret < 0) { |
167 | dev_err(max->dev, "register %d read failed, err = %d\n" , |
168 | max->curr_vout_reg, ret); |
169 | return ret; |
170 | } |
171 | return data & MAX8973_VOUT_MASK; |
172 | } |
173 | |
174 | static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, |
175 | unsigned vsel) |
176 | { |
177 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
178 | int ret; |
179 | bool found = false; |
180 | int vout_reg = max->curr_vout_reg; |
181 | int gpio_val = max->curr_gpio_val; |
182 | |
183 | /* |
184 | * If gpios are available to select the VOUT register then least |
185 | * recently used register for new configuration. |
186 | */ |
187 | if (gpio_is_valid(number: max->dvs_gpio)) |
188 | found = find_voltage_set_register(tps: max, req_vsel: vsel, |
189 | vout_reg: &vout_reg, gpio_val: &gpio_val); |
190 | |
191 | if (!found) { |
192 | ret = regmap_update_bits(map: max->regmap, reg: vout_reg, |
193 | MAX8973_VOUT_MASK, val: vsel); |
194 | if (ret < 0) { |
195 | dev_err(max->dev, "register %d update failed, err %d\n" , |
196 | vout_reg, ret); |
197 | return ret; |
198 | } |
199 | max->curr_vout_reg = vout_reg; |
200 | max->curr_vout_val[gpio_val] = vsel; |
201 | } |
202 | |
203 | /* Select proper VOUT register vio gpios */ |
204 | if (gpio_is_valid(number: max->dvs_gpio)) { |
205 | gpio_set_value_cansleep(gpio: max->dvs_gpio, value: gpio_val & 0x1); |
206 | max->curr_gpio_val = gpio_val; |
207 | } |
208 | return 0; |
209 | } |
210 | |
211 | static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) |
212 | { |
213 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
214 | int ret; |
215 | int pwm; |
216 | |
217 | /* Enable force PWM mode in FAST mode only. */ |
218 | switch (mode) { |
219 | case REGULATOR_MODE_FAST: |
220 | pwm = MAX8973_FPWM_EN_M; |
221 | break; |
222 | |
223 | case REGULATOR_MODE_NORMAL: |
224 | pwm = 0; |
225 | break; |
226 | |
227 | default: |
228 | return -EINVAL; |
229 | } |
230 | |
231 | ret = regmap_update_bits(map: max->regmap, MAX8973_CONTROL1, |
232 | MAX8973_FPWM_EN_M, val: pwm); |
233 | if (ret < 0) |
234 | dev_err(max->dev, "register %d update failed, err %d\n" , |
235 | MAX8973_CONTROL1, ret); |
236 | return ret; |
237 | } |
238 | |
239 | static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) |
240 | { |
241 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
242 | unsigned int data; |
243 | int ret; |
244 | |
245 | ret = regmap_read(map: max->regmap, MAX8973_CONTROL1, val: &data); |
246 | if (ret < 0) { |
247 | dev_err(max->dev, "register %d read failed, err %d\n" , |
248 | MAX8973_CONTROL1, ret); |
249 | return ret; |
250 | } |
251 | return (data & MAX8973_FPWM_EN_M) ? |
252 | REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; |
253 | } |
254 | |
255 | static int max8973_set_current_limit(struct regulator_dev *rdev, |
256 | int min_ua, int max_ua) |
257 | { |
258 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
259 | unsigned int val; |
260 | int ret; |
261 | |
262 | if (max_ua <= 9000000) |
263 | val = MAX8973_CKKADV_TRIP_75mV_PER_US; |
264 | else if (max_ua <= 12000000) |
265 | val = MAX8973_CKKADV_TRIP_150mV_PER_US; |
266 | else |
267 | val = MAX8973_CKKADV_TRIP_DISABLE; |
268 | |
269 | ret = regmap_update_bits(map: max->regmap, MAX8973_CONTROL2, |
270 | MAX8973_CKKADV_TRIP_MASK, val); |
271 | if (ret < 0) { |
272 | dev_err(max->dev, "register %d update failed: %d\n" , |
273 | MAX8973_CONTROL2, ret); |
274 | return ret; |
275 | } |
276 | return 0; |
277 | } |
278 | |
279 | static int max8973_get_current_limit(struct regulator_dev *rdev) |
280 | { |
281 | struct max8973_chip *max = rdev_get_drvdata(rdev); |
282 | unsigned int control2; |
283 | int ret; |
284 | |
285 | ret = regmap_read(map: max->regmap, MAX8973_CONTROL2, val: &control2); |
286 | if (ret < 0) { |
287 | dev_err(max->dev, "register %d read failed: %d\n" , |
288 | MAX8973_CONTROL2, ret); |
289 | return ret; |
290 | } |
291 | switch (control2 & MAX8973_CKKADV_TRIP_MASK) { |
292 | case MAX8973_CKKADV_TRIP_DISABLE: |
293 | return 15000000; |
294 | case MAX8973_CKKADV_TRIP_150mV_PER_US: |
295 | return 12000000; |
296 | case MAX8973_CKKADV_TRIP_75mV_PER_US: |
297 | return 9000000; |
298 | default: |
299 | break; |
300 | } |
301 | return 9000000; |
302 | } |
303 | |
304 | static const unsigned int max8973_buck_ramp_table[] = { |
305 | 12000, 25000, 50000, 200000 |
306 | }; |
307 | |
308 | static const struct regulator_ops max8973_dcdc_ops = { |
309 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
310 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, |
311 | .list_voltage = regulator_list_voltage_linear, |
312 | .set_mode = max8973_dcdc_set_mode, |
313 | .get_mode = max8973_dcdc_get_mode, |
314 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
315 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
316 | }; |
317 | |
318 | static int max8973_init_dcdc(struct max8973_chip *max, |
319 | struct max8973_regulator_platform_data *pdata) |
320 | { |
321 | int ret; |
322 | uint8_t control1 = 0; |
323 | uint8_t control2 = 0; |
324 | unsigned int data; |
325 | |
326 | ret = regmap_read(map: max->regmap, MAX8973_CONTROL1, val: &data); |
327 | if (ret < 0) { |
328 | dev_err(max->dev, "register %d read failed, err = %d" , |
329 | MAX8973_CONTROL1, ret); |
330 | return ret; |
331 | } |
332 | control1 = data & MAX8973_RAMP_MASK; |
333 | switch (control1) { |
334 | case MAX8973_RAMP_12mV_PER_US: |
335 | max->desc.ramp_delay = 12000; |
336 | break; |
337 | case MAX8973_RAMP_25mV_PER_US: |
338 | max->desc.ramp_delay = 25000; |
339 | break; |
340 | case MAX8973_RAMP_50mV_PER_US: |
341 | max->desc.ramp_delay = 50000; |
342 | break; |
343 | case MAX8973_RAMP_200mV_PER_US: |
344 | max->desc.ramp_delay = 200000; |
345 | break; |
346 | } |
347 | |
348 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) |
349 | control1 |= MAX8973_SNS_ENABLE; |
350 | |
351 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) |
352 | control1 |= MAX8973_NFSR_ENABLE; |
353 | |
354 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) |
355 | control1 |= MAX8973_AD_ENABLE; |
356 | |
357 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
358 | control1 |= MAX8973_BIAS_ENABLE; |
359 | max->desc.enable_time = 20; |
360 | } else { |
361 | max->desc.enable_time = 240; |
362 | } |
363 | |
364 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) |
365 | control1 |= MAX8973_FREQSHIFT_9PER; |
366 | |
367 | if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && |
368 | (max->id == MAX77621)) |
369 | control2 |= MAX77621_T_JUNCTION_120; |
370 | |
371 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
372 | control2 |= MAX8973_DISCH_ENBABLE; |
373 | |
374 | /* Clock advance trip configuration */ |
375 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { |
376 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: |
377 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; |
378 | break; |
379 | |
380 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: |
381 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; |
382 | break; |
383 | |
384 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: |
385 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; |
386 | break; |
387 | |
388 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: |
389 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; |
390 | break; |
391 | } |
392 | |
393 | /* Configure inductor value */ |
394 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { |
395 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: |
396 | control2 |= MAX8973_INDUCTOR_NOMINAL; |
397 | break; |
398 | |
399 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: |
400 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; |
401 | break; |
402 | |
403 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: |
404 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; |
405 | break; |
406 | |
407 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: |
408 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; |
409 | break; |
410 | } |
411 | |
412 | ret = regmap_write(map: max->regmap, MAX8973_CONTROL1, val: control1); |
413 | if (ret < 0) { |
414 | dev_err(max->dev, "register %d write failed, err = %d" , |
415 | MAX8973_CONTROL1, ret); |
416 | return ret; |
417 | } |
418 | |
419 | ret = regmap_write(map: max->regmap, MAX8973_CONTROL2, val: control2); |
420 | if (ret < 0) { |
421 | dev_err(max->dev, "register %d write failed, err = %d" , |
422 | MAX8973_CONTROL2, ret); |
423 | return ret; |
424 | } |
425 | |
426 | /* If external control is enabled then disable EN bit */ |
427 | if (max->enable_external_control && (max->id == MAX8973)) { |
428 | ret = regmap_update_bits(map: max->regmap, MAX8973_VOUT, |
429 | MAX8973_VOUT_ENABLE, val: 0); |
430 | if (ret < 0) |
431 | dev_err(max->dev, "register %d update failed, err = %d" , |
432 | MAX8973_VOUT, ret); |
433 | } |
434 | return ret; |
435 | } |
436 | |
437 | static int max8973_thermal_read_temp(struct thermal_zone_device *tz, int *temp) |
438 | { |
439 | struct max8973_chip *mchip = thermal_zone_device_priv(tzd: tz); |
440 | unsigned int val; |
441 | int ret; |
442 | |
443 | ret = regmap_read(map: mchip->regmap, MAX8973_CHIPID1, val: &val); |
444 | if (ret < 0) { |
445 | dev_err(mchip->dev, "Failed to read register CHIPID1, %d" , ret); |
446 | return ret; |
447 | } |
448 | |
449 | /* +1 degC to trigger cool device */ |
450 | if (val & MAX77621_CHIPID_TJINT_S) |
451 | *temp = mchip->junction_temp_warning + 1000; |
452 | else |
453 | *temp = MAX77621_NORMAL_OPERATING_TEMP; |
454 | |
455 | return 0; |
456 | } |
457 | |
458 | static irqreturn_t max8973_thermal_irq(int irq, void *data) |
459 | { |
460 | struct max8973_chip *mchip = data; |
461 | |
462 | thermal_zone_device_update(mchip->tz_device, |
463 | THERMAL_EVENT_UNSPECIFIED); |
464 | |
465 | return IRQ_HANDLED; |
466 | } |
467 | |
468 | static const struct thermal_zone_device_ops max77621_tz_ops = { |
469 | .get_temp = max8973_thermal_read_temp, |
470 | }; |
471 | |
472 | static int max8973_thermal_init(struct max8973_chip *mchip) |
473 | { |
474 | struct thermal_zone_device *tzd; |
475 | struct irq_data *irq_data; |
476 | unsigned long irq_flags = 0; |
477 | int ret; |
478 | |
479 | if (mchip->id != MAX77621) |
480 | return 0; |
481 | |
482 | tzd = devm_thermal_of_zone_register(dev: mchip->dev, id: 0, data: mchip, |
483 | ops: &max77621_tz_ops); |
484 | if (IS_ERR(ptr: tzd)) { |
485 | ret = PTR_ERR(ptr: tzd); |
486 | dev_err(mchip->dev, "Failed to register thermal sensor: %d\n" , |
487 | ret); |
488 | return ret; |
489 | } |
490 | |
491 | if (mchip->irq <= 0) |
492 | return 0; |
493 | |
494 | irq_data = irq_get_irq_data(irq: mchip->irq); |
495 | if (irq_data) |
496 | irq_flags = irqd_get_trigger_type(d: irq_data); |
497 | |
498 | ret = devm_request_threaded_irq(dev: mchip->dev, irq: mchip->irq, NULL, |
499 | thread_fn: max8973_thermal_irq, |
500 | IRQF_ONESHOT | IRQF_SHARED | irq_flags, |
501 | devname: dev_name(dev: mchip->dev), dev_id: mchip); |
502 | if (ret < 0) { |
503 | dev_err(mchip->dev, "Failed to request irq %d, %d\n" , |
504 | mchip->irq, ret); |
505 | return ret; |
506 | } |
507 | |
508 | return 0; |
509 | } |
510 | |
511 | static const struct regmap_config max8973_regmap_config = { |
512 | .reg_bits = 8, |
513 | .val_bits = 8, |
514 | .max_register = MAX8973_CHIPID2, |
515 | .cache_type = REGCACHE_RBTREE, |
516 | }; |
517 | |
518 | static struct max8973_regulator_platform_data *max8973_parse_dt( |
519 | struct device *dev) |
520 | { |
521 | struct max8973_regulator_platform_data *pdata; |
522 | struct device_node *np = dev->of_node; |
523 | int ret; |
524 | u32 pval; |
525 | bool etr_enable; |
526 | bool etr_sensitivity_high; |
527 | |
528 | pdata = devm_kzalloc(dev, size: sizeof(*pdata), GFP_KERNEL); |
529 | if (!pdata) |
530 | return NULL; |
531 | |
532 | pdata->enable_ext_control = of_property_read_bool(np, |
533 | propname: "maxim,externally-enable" ); |
534 | pdata->dvs_gpio = of_get_named_gpio(np, list_name: "maxim,dvs-gpio" , index: 0); |
535 | |
536 | ret = of_property_read_u32(np, propname: "maxim,dvs-default-state" , out_value: &pval); |
537 | if (!ret) |
538 | pdata->dvs_def_state = pval; |
539 | |
540 | if (of_property_read_bool(np, propname: "maxim,enable-remote-sense" )) |
541 | pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; |
542 | |
543 | if (of_property_read_bool(np, propname: "maxim,enable-falling-slew-rate" )) |
544 | pdata->control_flags |= |
545 | MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; |
546 | |
547 | if (of_property_read_bool(np, propname: "maxim,enable-active-discharge" )) |
548 | pdata->control_flags |= |
549 | MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; |
550 | |
551 | if (of_property_read_bool(np, propname: "maxim,enable-frequency-shift" )) |
552 | pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; |
553 | |
554 | if (of_property_read_bool(np, propname: "maxim,enable-bias-control" )) |
555 | pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; |
556 | |
557 | etr_enable = of_property_read_bool(np, propname: "maxim,enable-etr" ); |
558 | etr_sensitivity_high = of_property_read_bool(np, |
559 | propname: "maxim,enable-high-etr-sensitivity" ); |
560 | if (etr_sensitivity_high) |
561 | etr_enable = true; |
562 | |
563 | if (etr_enable) { |
564 | if (etr_sensitivity_high) |
565 | pdata->control_flags |= |
566 | MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; |
567 | else |
568 | pdata->control_flags |= |
569 | MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; |
570 | } else { |
571 | pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; |
572 | } |
573 | |
574 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; |
575 | ret = of_property_read_u32(np, propname: "junction-warn-millicelsius" , out_value: &pval); |
576 | if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) |
577 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; |
578 | |
579 | return pdata; |
580 | } |
581 | |
582 | static const struct of_device_id of_max8973_match_tbl[] = { |
583 | { .compatible = "maxim,max8973" , .data = (void *)MAX8973, }, |
584 | { .compatible = "maxim,max77621" , .data = (void *)MAX77621, }, |
585 | { }, |
586 | }; |
587 | MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); |
588 | |
589 | static int max8973_probe(struct i2c_client *client) |
590 | { |
591 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
592 | struct max8973_regulator_platform_data *pdata; |
593 | struct regulator_init_data *ridata; |
594 | struct regulator_config config = { }; |
595 | struct regulator_dev *rdev; |
596 | struct max8973_chip *max; |
597 | bool pdata_from_dt = false; |
598 | unsigned int chip_id; |
599 | struct gpio_desc *gpiod; |
600 | enum gpiod_flags gflags; |
601 | int ret; |
602 | |
603 | pdata = dev_get_platdata(dev: &client->dev); |
604 | |
605 | if (!pdata && client->dev.of_node) { |
606 | pdata = max8973_parse_dt(dev: &client->dev); |
607 | pdata_from_dt = true; |
608 | } |
609 | |
610 | if (!pdata) { |
611 | dev_err(&client->dev, "No Platform data" ); |
612 | return -EIO; |
613 | } |
614 | |
615 | if (pdata->dvs_gpio == -EPROBE_DEFER) |
616 | return -EPROBE_DEFER; |
617 | |
618 | max = devm_kzalloc(dev: &client->dev, size: sizeof(*max), GFP_KERNEL); |
619 | if (!max) |
620 | return -ENOMEM; |
621 | |
622 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); |
623 | if (IS_ERR(ptr: max->regmap)) { |
624 | ret = PTR_ERR(ptr: max->regmap); |
625 | dev_err(&client->dev, "regmap init failed, err %d\n" , ret); |
626 | return ret; |
627 | } |
628 | |
629 | if (client->dev.of_node) { |
630 | const struct of_device_id *match; |
631 | |
632 | match = of_match_device(of_match_ptr(of_max8973_match_tbl), |
633 | dev: &client->dev); |
634 | if (!match) |
635 | return -ENODATA; |
636 | max->id = (u32)((uintptr_t)match->data); |
637 | } else { |
638 | max->id = id->driver_data; |
639 | } |
640 | |
641 | ret = regmap_read(map: max->regmap, MAX8973_CHIPID1, val: &chip_id); |
642 | if (ret < 0) { |
643 | dev_err(&client->dev, "register CHIPID1 read failed, %d" , ret); |
644 | return ret; |
645 | } |
646 | |
647 | dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n" , |
648 | (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); |
649 | |
650 | i2c_set_clientdata(client, data: max); |
651 | max->ops = max8973_dcdc_ops; |
652 | max->dev = &client->dev; |
653 | max->desc.name = id->name; |
654 | max->desc.id = 0; |
655 | max->desc.ops = &max->ops; |
656 | max->desc.type = REGULATOR_VOLTAGE; |
657 | max->desc.owner = THIS_MODULE; |
658 | max->desc.min_uV = MAX8973_MIN_VOLATGE; |
659 | max->desc.uV_step = MAX8973_VOLATGE_STEP; |
660 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; |
661 | max->desc.ramp_reg = MAX8973_CONTROL1; |
662 | max->desc.ramp_mask = MAX8973_RAMP_MASK; |
663 | max->desc.ramp_delay_table = max8973_buck_ramp_table; |
664 | max->desc.n_ramp_values = ARRAY_SIZE(max8973_buck_ramp_table); |
665 | |
666 | max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
667 | max->enable_external_control = pdata->enable_ext_control; |
668 | max->curr_gpio_val = pdata->dvs_def_state; |
669 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; |
670 | max->junction_temp_warning = pdata->junction_temp_warning; |
671 | |
672 | max->lru_index[0] = max->curr_vout_reg; |
673 | |
674 | if (gpio_is_valid(number: max->dvs_gpio)) { |
675 | int gpio_flags; |
676 | int i; |
677 | |
678 | gpio_flags = (pdata->dvs_def_state) ? |
679 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; |
680 | ret = devm_gpio_request_one(dev: &client->dev, gpio: max->dvs_gpio, |
681 | flags: gpio_flags, label: "max8973-dvs" ); |
682 | if (ret) { |
683 | dev_err(&client->dev, |
684 | "gpio_request for gpio %d failed, err = %d\n" , |
685 | max->dvs_gpio, ret); |
686 | return ret; |
687 | } |
688 | |
689 | /* |
690 | * Initialize the lru index with vout_reg id |
691 | * The index 0 will be most recently used and |
692 | * set with the max->curr_vout_reg */ |
693 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) |
694 | max->lru_index[i] = i; |
695 | max->lru_index[0] = max->curr_vout_reg; |
696 | max->lru_index[max->curr_vout_reg] = 0; |
697 | } else { |
698 | /* |
699 | * If there is no DVS GPIO, the VOUT register |
700 | * address is fixed. |
701 | */ |
702 | max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; |
703 | max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; |
704 | max->desc.vsel_reg = max->curr_vout_reg; |
705 | max->desc.vsel_mask = MAX8973_VOUT_MASK; |
706 | } |
707 | |
708 | if (pdata_from_dt) |
709 | pdata->reg_init_data = of_get_regulator_init_data(dev: &client->dev, |
710 | node: client->dev.of_node, desc: &max->desc); |
711 | |
712 | ridata = pdata->reg_init_data; |
713 | switch (max->id) { |
714 | case MAX8973: |
715 | if (!pdata->enable_ext_control) { |
716 | max->desc.enable_reg = MAX8973_VOUT; |
717 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; |
718 | max->ops.enable = regulator_enable_regmap; |
719 | max->ops.disable = regulator_disable_regmap; |
720 | max->ops.is_enabled = regulator_is_enabled_regmap; |
721 | break; |
722 | } |
723 | |
724 | if (ridata && (ridata->constraints.always_on || |
725 | ridata->constraints.boot_on)) |
726 | gflags = GPIOD_OUT_HIGH; |
727 | else |
728 | gflags = GPIOD_OUT_LOW; |
729 | gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
730 | gpiod = devm_gpiod_get_optional(dev: &client->dev, |
731 | con_id: "maxim,enable" , |
732 | flags: gflags); |
733 | if (IS_ERR(ptr: gpiod)) |
734 | return PTR_ERR(ptr: gpiod); |
735 | if (gpiod) { |
736 | config.ena_gpiod = gpiod; |
737 | max->enable_external_control = true; |
738 | } |
739 | |
740 | break; |
741 | |
742 | case MAX77621: |
743 | /* |
744 | * We do not let the core switch this regulator on/off, |
745 | * we just leave it on. |
746 | */ |
747 | gpiod = devm_gpiod_get_optional(dev: &client->dev, |
748 | con_id: "maxim,enable" , |
749 | flags: GPIOD_OUT_HIGH); |
750 | if (IS_ERR(ptr: gpiod)) |
751 | return PTR_ERR(ptr: gpiod); |
752 | if (gpiod) |
753 | max->enable_external_control = true; |
754 | |
755 | max->desc.enable_reg = MAX8973_VOUT; |
756 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; |
757 | max->ops.enable = regulator_enable_regmap; |
758 | max->ops.disable = regulator_disable_regmap; |
759 | max->ops.is_enabled = regulator_is_enabled_regmap; |
760 | max->ops.set_current_limit = max8973_set_current_limit; |
761 | max->ops.get_current_limit = max8973_get_current_limit; |
762 | break; |
763 | default: |
764 | break; |
765 | } |
766 | |
767 | ret = max8973_init_dcdc(max, pdata); |
768 | if (ret < 0) { |
769 | dev_err(max->dev, "Max8973 Init failed, err = %d\n" , ret); |
770 | return ret; |
771 | } |
772 | |
773 | config.dev = &client->dev; |
774 | config.init_data = pdata->reg_init_data; |
775 | config.driver_data = max; |
776 | config.of_node = client->dev.of_node; |
777 | config.regmap = max->regmap; |
778 | |
779 | /* |
780 | * Register the regulators |
781 | * Turn the GPIO descriptor over to the regulator core for |
782 | * lifecycle management if we pass an ena_gpiod. |
783 | */ |
784 | if (config.ena_gpiod) |
785 | devm_gpiod_unhinge(dev: &client->dev, desc: config.ena_gpiod); |
786 | rdev = devm_regulator_register(dev: &client->dev, regulator_desc: &max->desc, config: &config); |
787 | if (IS_ERR(ptr: rdev)) { |
788 | ret = PTR_ERR(ptr: rdev); |
789 | dev_err(max->dev, "regulator register failed, err %d\n" , ret); |
790 | return ret; |
791 | } |
792 | |
793 | max8973_thermal_init(mchip: max); |
794 | return 0; |
795 | } |
796 | |
797 | static const struct i2c_device_id max8973_id[] = { |
798 | {.name = "max8973" , .driver_data = MAX8973}, |
799 | {.name = "max77621" , .driver_data = MAX77621}, |
800 | {}, |
801 | }; |
802 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
803 | |
804 | static struct i2c_driver max8973_i2c_driver = { |
805 | .driver = { |
806 | .name = "max8973" , |
807 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
808 | .of_match_table = of_max8973_match_tbl, |
809 | }, |
810 | .probe = max8973_probe, |
811 | .id_table = max8973_id, |
812 | }; |
813 | |
814 | static int __init max8973_init(void) |
815 | { |
816 | return i2c_add_driver(&max8973_i2c_driver); |
817 | } |
818 | subsys_initcall(max8973_init); |
819 | |
820 | static void __exit max8973_cleanup(void) |
821 | { |
822 | i2c_del_driver(driver: &max8973_i2c_driver); |
823 | } |
824 | module_exit(max8973_cleanup); |
825 | |
826 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>" ); |
827 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver" ); |
828 | MODULE_LICENSE("GPL v2" ); |
829 | |