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