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e634cf4e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
5928f538 | 2 | /* |
f1e5ecc5 | 3 | * max8973-regulator.c -- Maxim max8973A |
5928f538 | 4 | * |
f1e5ecc5 | 5 | * Regulator driver for MAXIM 8973A DC-DC step-down switching regulator. |
5928f538 LD |
6 | * |
7 | * Copyright (c) 2012, NVIDIA Corporation. | |
8 | * | |
9 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
5928f538 LD |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/err.h> | |
42dc3023 | 16 | #include <linux/of.h> |
0f7d6ece | 17 | #include <linux/of_device.h> |
5928f538 LD |
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> | |
42dc3023 | 22 | #include <linux/regulator/of_regulator.h> |
5928f538 | 23 | #include <linux/gpio.h> |
e7d2be69 | 24 | #include <linux/gpio/consumer.h> |
c2ffa973 | 25 | #include <linux/of_gpio.h> |
5928f538 LD |
26 | #include <linux/i2c.h> |
27 | #include <linux/slab.h> | |
28 | #include <linux/regmap.h> | |
d2d5437b LD |
29 | #include <linux/thermal.h> |
30 | #include <linux/irq.h> | |
31 | #include <linux/interrupt.h> | |
5928f538 LD |
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 | |
3064c1f3 | 62 | #define MAX8973_RAMP_MASK 0x3 |
5928f538 LD |
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) | |
d2d5437b | 68 | #define MAX77621_T_JUNCTION_120 BIT(7) |
5928f538 | 69 | |
ffaab991 | 70 | #define MAX8973_CKKADV_TRIP_MASK 0xC |
5928f538 LD |
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 | ||
d2d5437b LD |
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 | ||
0f7d6ece LD |
94 | enum device_id { |
95 | MAX8973, | |
96 | MAX77621 | |
97 | }; | |
98 | ||
5928f538 LD |
99 | /* Maxim 8973 chip information */ |
100 | struct max8973_chip { | |
101 | struct device *dev; | |
102 | struct regulator_desc desc; | |
5928f538 LD |
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; | |
db892ff6 | 110 | struct regulator_ops ops; |
0f7d6ece | 111 | enum device_id id; |
d2d5437b LD |
112 | int junction_temp_warning; |
113 | int irq; | |
114 | struct thermal_zone_device *tz_device; | |
5928f538 LD |
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(max->regmap, max->curr_vout_reg, &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 | */ | |
fa5f509f | 187 | if (gpio_is_valid(max->dvs_gpio)) |
5928f538 LD |
188 | found = find_voltage_set_register(max, vsel, |
189 | &vout_reg, &gpio_val); | |
190 | ||
191 | if (!found) { | |
192 | ret = regmap_update_bits(max->regmap, vout_reg, | |
193 | MAX8973_VOUT_MASK, 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 */ | |
fa5f509f | 204 | if (gpio_is_valid(max->dvs_gpio)) { |
5928f538 LD |
205 | gpio_set_value_cansleep(max->dvs_gpio, 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(max->regmap, MAX8973_CONTROL1, | |
232 | MAX8973_FPWM_EN_M, 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(max->regmap, MAX8973_CONTROL1, &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 | ||
ffaab991 LD |
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(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(max->regmap, MAX8973_CONTROL2, &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 | ||
8590ccd4 AL |
304 | static const unsigned int max8973_buck_ramp_table[] = { |
305 | 12000, 25000, 50000, 200000 | |
306 | }; | |
307 | ||
db892ff6 | 308 | static const struct regulator_ops max8973_dcdc_ops = { |
5928f538 LD |
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, | |
3064c1f3 | 314 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
8590ccd4 | 315 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
5928f538 LD |
316 | }; |
317 | ||
3d68dfe3 GKH |
318 | static int max8973_init_dcdc(struct max8973_chip *max, |
319 | struct max8973_regulator_platform_data *pdata) | |
5928f538 LD |
320 | { |
321 | int ret; | |
322 | uint8_t control1 = 0; | |
323 | uint8_t control2 = 0; | |
3064c1f3 LD |
324 | unsigned int data; |
325 | ||
326 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &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: | |
366604ec | 338 | max->desc.ramp_delay = 25000; |
3064c1f3 LD |
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 | } | |
5928f538 LD |
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 | ||
dcd9ec6a | 357 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
5928f538 | 358 | control1 |= MAX8973_BIAS_ENABLE; |
dcd9ec6a LD |
359 | max->desc.enable_time = 20; |
360 | } else { | |
361 | max->desc.enable_time = 240; | |
362 | } | |
5928f538 LD |
363 | |
364 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) | |
365 | control1 |= MAX8973_FREQSHIFT_9PER; | |
366 | ||
d2d5437b LD |
367 | if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && |
368 | (max->id == MAX77621)) | |
369 | control2 |= MAX77621_T_JUNCTION_120; | |
370 | ||
5928f538 LD |
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(max->regmap, MAX8973_CONTROL1, 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(max->regmap, MAX8973_CONTROL2, 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 */ | |
0f7d6ece | 427 | if (max->enable_external_control && (max->id == MAX8973)) { |
5928f538 LD |
428 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
429 | MAX8973_VOUT_ENABLE, 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 | ||
826855ff | 437 | static int max8973_thermal_read_temp(struct thermal_zone_device *tz, int *temp) |
d2d5437b | 438 | { |
3d4e1bad | 439 | struct max8973_chip *mchip = thermal_zone_device_priv(tz); |
d2d5437b LD |
440 | unsigned int val; |
441 | int ret; | |
442 | ||
443 | ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); | |
444 | if (ret < 0) { | |
445 | dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); | |
446 | return ret; | |
447 | } | |
448 | ||
bbc7ba0f | 449 | /* +1 degC to trigger cool device */ |
d2d5437b LD |
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 | ||
0e70f466 SP |
462 | thermal_zone_device_update(mchip->tz_device, |
463 | THERMAL_EVENT_UNSPECIFIED); | |
d2d5437b LD |
464 | |
465 | return IRQ_HANDLED; | |
466 | } | |
467 | ||
826855ff | 468 | static const struct thermal_zone_device_ops max77621_tz_ops = { |
d2d5437b LD |
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 | ||
826855ff DL |
482 | tzd = devm_thermal_of_zone_register(mchip->dev, 0, mchip, |
483 | &max77621_tz_ops); | |
d2d5437b LD |
484 | if (IS_ERR(tzd)) { |
485 | ret = PTR_ERR(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(mchip->irq); | |
495 | if (irq_data) | |
496 | irq_flags = irqd_get_trigger_type(irq_data); | |
497 | ||
498 | ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, | |
499 | max8973_thermal_irq, | |
500 | IRQF_ONESHOT | IRQF_SHARED | irq_flags, | |
501 | dev_name(mchip->dev), 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 | ||
5928f538 LD |
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 | ||
c2ffa973 LD |
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; | |
3692db3a LD |
525 | bool etr_enable; |
526 | bool etr_sensitivity_high; | |
c2ffa973 LD |
527 | |
528 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
529 | if (!pdata) | |
530 | return NULL; | |
531 | ||
532 | pdata->enable_ext_control = of_property_read_bool(np, | |
533 | "maxim,externally-enable"); | |
534 | pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); | |
535 | ||
536 | ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); | |
537 | if (!ret) | |
538 | pdata->dvs_def_state = pval; | |
539 | ||
540 | if (of_property_read_bool(np, "maxim,enable-remote-sense")) | |
541 | pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; | |
542 | ||
543 | if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) | |
544 | pdata->control_flags |= | |
545 | MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; | |
546 | ||
547 | if (of_property_read_bool(np, "maxim,enable-active-discharge")) | |
548 | pdata->control_flags |= | |
549 | MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; | |
550 | ||
551 | if (of_property_read_bool(np, "maxim,enable-frequency-shift")) | |
552 | pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; | |
553 | ||
554 | if (of_property_read_bool(np, "maxim,enable-bias-control")) | |
127e1062 | 555 | pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; |
c2ffa973 | 556 | |
3692db3a LD |
557 | etr_enable = of_property_read_bool(np, "maxim,enable-etr"); |
558 | etr_sensitivity_high = of_property_read_bool(np, | |
559 | "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 | ||
d2d5437b LD |
574 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; |
575 | ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); | |
576 | if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) | |
577 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; | |
578 | ||
c2ffa973 LD |
579 | return pdata; |
580 | } | |
581 | ||
0f7d6ece LD |
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 | ||
4e85e5d6 | 589 | static int max8973_probe(struct i2c_client *client) |
5928f538 | 590 | { |
4e85e5d6 | 591 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
5928f538 | 592 | struct max8973_regulator_platform_data *pdata; |
69eb0980 | 593 | struct regulator_init_data *ridata; |
5928f538 LD |
594 | struct regulator_config config = { }; |
595 | struct regulator_dev *rdev; | |
596 | struct max8973_chip *max; | |
c2ffa973 | 597 | bool pdata_from_dt = false; |
0f7d6ece | 598 | unsigned int chip_id; |
e7d2be69 LW |
599 | struct gpio_desc *gpiod; |
600 | enum gpiod_flags gflags; | |
5928f538 LD |
601 | int ret; |
602 | ||
dff91d0b | 603 | pdata = dev_get_platdata(&client->dev); |
42dc3023 | 604 | |
c2ffa973 LD |
605 | if (!pdata && client->dev.of_node) { |
606 | pdata = max8973_parse_dt(&client->dev); | |
607 | pdata_from_dt = true; | |
608 | } | |
609 | ||
610 | if (!pdata) { | |
5928f538 LD |
611 | dev_err(&client->dev, "No Platform data"); |
612 | return -EIO; | |
613 | } | |
614 | ||
e7d2be69 | 615 | if (pdata->dvs_gpio == -EPROBE_DEFER) |
c2ffa973 LD |
616 | return -EPROBE_DEFER; |
617 | ||
5928f538 | 618 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
21024dee | 619 | if (!max) |
5928f538 | 620 | return -ENOMEM; |
5928f538 LD |
621 | |
622 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); | |
623 | if (IS_ERR(max->regmap)) { | |
624 | ret = PTR_ERR(max->regmap); | |
625 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
626 | return ret; | |
627 | } | |
628 | ||
0f7d6ece LD |
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 | &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(max->regmap, MAX8973_CHIPID1, &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 | ||
5928f538 | 650 | i2c_set_clientdata(client, max); |
db892ff6 | 651 | max->ops = max8973_dcdc_ops; |
5928f538 LD |
652 | max->dev = &client->dev; |
653 | max->desc.name = id->name; | |
654 | max->desc.id = 0; | |
db892ff6 | 655 | max->desc.ops = &max->ops; |
5928f538 LD |
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; | |
8590ccd4 AL |
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); | |
5928f538 | 665 | |
69eb0980 | 666 | max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
69eb0980 LD |
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; | |
d2d5437b | 670 | max->junction_temp_warning = pdata->junction_temp_warning; |
69eb0980 | 671 | |
5928f538 | 672 | max->lru_index[0] = max->curr_vout_reg; |
5928f538 LD |
673 | |
674 | if (gpio_is_valid(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(&client->dev, max->dvs_gpio, | |
681 | gpio_flags, "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 | } | |
5928f538 LD |
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; | |
b10c7f3c MP |
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; | |
5928f538 LD |
706 | } |
707 | ||
c2ffa973 LD |
708 | if (pdata_from_dt) |
709 | pdata->reg_init_data = of_get_regulator_init_data(&client->dev, | |
710 | client->dev.of_node, &max->desc); | |
711 | ||
0f7d6ece LD |
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 | ||
e7d2be69 LW |
724 | if (ridata && (ridata->constraints.always_on || |
725 | ridata->constraints.boot_on)) | |
726 | gflags = GPIOD_OUT_HIGH; | |
727 | else | |
728 | gflags = GPIOD_OUT_LOW; | |
63239e4b | 729 | gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
e7d2be69 LW |
730 | gpiod = devm_gpiod_get_optional(&client->dev, |
731 | "maxim,enable", | |
732 | gflags); | |
733 | if (IS_ERR(gpiod)) | |
734 | return PTR_ERR(gpiod); | |
735 | if (gpiod) { | |
736 | config.ena_gpiod = gpiod; | |
737 | max->enable_external_control = true; | |
0f7d6ece | 738 | } |
e7d2be69 | 739 | |
0f7d6ece LD |
740 | break; |
741 | ||
742 | case MAX77621: | |
e7d2be69 LW |
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(&client->dev, | |
748 | "maxim,enable", | |
749 | GPIOD_OUT_HIGH); | |
750 | if (IS_ERR(gpiod)) | |
751 | return PTR_ERR(gpiod); | |
752 | if (gpiod) | |
753 | max->enable_external_control = true; | |
0f7d6ece LD |
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; | |
ffaab991 LD |
760 | max->ops.set_current_limit = max8973_set_current_limit; |
761 | max->ops.get_current_limit = max8973_get_current_limit; | |
0f7d6ece LD |
762 | break; |
763 | default: | |
764 | break; | |
765 | } | |
766 | ||
c2ffa973 LD |
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; | |
5928f538 LD |
771 | } |
772 | ||
773 | config.dev = &client->dev; | |
c2ffa973 | 774 | config.init_data = pdata->reg_init_data; |
5928f538 LD |
775 | config.driver_data = max; |
776 | config.of_node = client->dev.of_node; | |
777 | config.regmap = max->regmap; | |
778 | ||
48bd226f LW |
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(&client->dev, config.ena_gpiod); | |
8d581fd0 | 786 | rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
5928f538 LD |
787 | if (IS_ERR(rdev)) { |
788 | ret = PTR_ERR(rdev); | |
789 | dev_err(max->dev, "regulator register failed, err %d\n", ret); | |
790 | return ret; | |
791 | } | |
792 | ||
d2d5437b | 793 | max8973_thermal_init(max); |
5928f538 LD |
794 | return 0; |
795 | } | |
796 | ||
5928f538 | 797 | static const struct i2c_device_id max8973_id[] = { |
0f7d6ece LD |
798 | {.name = "max8973", .driver_data = MAX8973}, |
799 | {.name = "max77621", .driver_data = MAX77621}, | |
5928f538 LD |
800 | {}, |
801 | }; | |
5928f538 LD |
802 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
803 | ||
804 | static struct i2c_driver max8973_i2c_driver = { | |
805 | .driver = { | |
806 | .name = "max8973", | |
259b93b2 | 807 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
0f7d6ece | 808 | .of_match_table = of_max8973_match_tbl, |
5928f538 | 809 | }, |
964e1865 | 810 | .probe = max8973_probe, |
5928f538 LD |
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(&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"); |