1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // SLG51000 High PSRR, Multi-Output Regulators
4 // Copyright (C) 2019  Dialog Semiconductor
5 //
6 // Author: Eric Jeong <eric.jeong.opensource@diasemi.com>
7 
8 #include <linux/err.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/i2c.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/regulator/of_regulator.h>
20 #include "slg51000-regulator.h"
21 
22 #define SLG51000_SCTL_EVT               7
23 #define SLG51000_MAX_EVT_REGISTER       8
24 #define SLG51000_LDOHP_LV_MIN           1200000
25 #define SLG51000_LDOHP_HV_MIN           2400000
26 
27 enum slg51000_regulators {
28 	SLG51000_REGULATOR_LDO1 = 0,
29 	SLG51000_REGULATOR_LDO2,
30 	SLG51000_REGULATOR_LDO3,
31 	SLG51000_REGULATOR_LDO4,
32 	SLG51000_REGULATOR_LDO5,
33 	SLG51000_REGULATOR_LDO6,
34 	SLG51000_REGULATOR_LDO7,
35 	SLG51000_MAX_REGULATORS,
36 };
37 
38 struct slg51000 {
39 	struct device *dev;
40 	struct regmap *regmap;
41 	struct regulator_desc *rdesc[SLG51000_MAX_REGULATORS];
42 	struct regulator_dev *rdev[SLG51000_MAX_REGULATORS];
43 	struct gpio_desc *cs_gpiod;
44 	int chip_irq;
45 };
46 
47 struct slg51000_evt_sta {
48 	unsigned int ereg;
49 	unsigned int sreg;
50 };
51 
52 static const struct slg51000_evt_sta es_reg[SLG51000_MAX_EVT_REGISTER] = {
53 	{SLG51000_LDO1_EVENT, SLG51000_LDO1_STATUS},
54 	{SLG51000_LDO2_EVENT, SLG51000_LDO2_STATUS},
55 	{SLG51000_LDO3_EVENT, SLG51000_LDO3_STATUS},
56 	{SLG51000_LDO4_EVENT, SLG51000_LDO4_STATUS},
57 	{SLG51000_LDO5_EVENT, SLG51000_LDO5_STATUS},
58 	{SLG51000_LDO6_EVENT, SLG51000_LDO6_STATUS},
59 	{SLG51000_LDO7_EVENT, SLG51000_LDO7_STATUS},
60 	{SLG51000_SYSCTL_EVENT, SLG51000_SYSCTL_STATUS},
61 };
62 
63 static const struct regmap_range slg51000_writeable_ranges[] = {
64 	regmap_reg_range(SLG51000_SYSCTL_MATRIX_CONF_A,
65 			 SLG51000_SYSCTL_MATRIX_CONF_A),
66 	regmap_reg_range(SLG51000_LDO1_VSEL, SLG51000_LDO1_VSEL),
67 	regmap_reg_range(SLG51000_LDO1_MINV, SLG51000_LDO1_MAXV),
68 	regmap_reg_range(SLG51000_LDO1_IRQ_MASK, SLG51000_LDO1_IRQ_MASK),
69 	regmap_reg_range(SLG51000_LDO2_VSEL, SLG51000_LDO2_VSEL),
70 	regmap_reg_range(SLG51000_LDO2_MINV, SLG51000_LDO2_MAXV),
71 	regmap_reg_range(SLG51000_LDO2_IRQ_MASK, SLG51000_LDO2_IRQ_MASK),
72 	regmap_reg_range(SLG51000_LDO3_VSEL, SLG51000_LDO3_VSEL),
73 	regmap_reg_range(SLG51000_LDO3_MINV, SLG51000_LDO3_MAXV),
74 	regmap_reg_range(SLG51000_LDO3_IRQ_MASK, SLG51000_LDO3_IRQ_MASK),
75 	regmap_reg_range(SLG51000_LDO4_VSEL, SLG51000_LDO4_VSEL),
76 	regmap_reg_range(SLG51000_LDO4_MINV, SLG51000_LDO4_MAXV),
77 	regmap_reg_range(SLG51000_LDO4_IRQ_MASK, SLG51000_LDO4_IRQ_MASK),
78 	regmap_reg_range(SLG51000_LDO5_VSEL, SLG51000_LDO5_VSEL),
79 	regmap_reg_range(SLG51000_LDO5_MINV, SLG51000_LDO5_MAXV),
80 	regmap_reg_range(SLG51000_LDO5_IRQ_MASK, SLG51000_LDO5_IRQ_MASK),
81 	regmap_reg_range(SLG51000_LDO6_VSEL, SLG51000_LDO6_VSEL),
82 	regmap_reg_range(SLG51000_LDO6_MINV, SLG51000_LDO6_MAXV),
83 	regmap_reg_range(SLG51000_LDO6_IRQ_MASK, SLG51000_LDO6_IRQ_MASK),
84 	regmap_reg_range(SLG51000_LDO7_VSEL, SLG51000_LDO7_VSEL),
85 	regmap_reg_range(SLG51000_LDO7_MINV, SLG51000_LDO7_MAXV),
86 	regmap_reg_range(SLG51000_LDO7_IRQ_MASK, SLG51000_LDO7_IRQ_MASK),
87 	regmap_reg_range(SLG51000_OTP_IRQ_MASK, SLG51000_OTP_IRQ_MASK),
88 };
89 
90 static const struct regmap_range slg51000_readable_ranges[] = {
91 	regmap_reg_range(SLG51000_SYSCTL_PATN_ID_B0,
92 			 SLG51000_SYSCTL_PATN_ID_B2),
93 	regmap_reg_range(SLG51000_SYSCTL_SYS_CONF_A,
94 			 SLG51000_SYSCTL_SYS_CONF_A),
95 	regmap_reg_range(SLG51000_SYSCTL_SYS_CONF_D,
96 			 SLG51000_SYSCTL_MATRIX_CONF_B),
97 	regmap_reg_range(SLG51000_SYSCTL_REFGEN_CONF_C,
98 			 SLG51000_SYSCTL_UVLO_CONF_A),
99 	regmap_reg_range(SLG51000_SYSCTL_FAULT_LOG1, SLG51000_SYSCTL_IRQ_MASK),
100 	regmap_reg_range(SLG51000_IO_GPIO1_CONF, SLG51000_IO_GPIO_STATUS),
101 	regmap_reg_range(SLG51000_LUTARRAY_LUT_VAL_0,
102 			 SLG51000_LUTARRAY_LUT_VAL_11),
103 	regmap_reg_range(SLG51000_MUXARRAY_INPUT_SEL_0,
104 			 SLG51000_MUXARRAY_INPUT_SEL_63),
105 	regmap_reg_range(SLG51000_PWRSEQ_RESOURCE_EN_0,
106 			 SLG51000_PWRSEQ_INPUT_SENSE_CONF_B),
107 	regmap_reg_range(SLG51000_LDO1_VSEL, SLG51000_LDO1_VSEL),
108 	regmap_reg_range(SLG51000_LDO1_MINV, SLG51000_LDO1_MAXV),
109 	regmap_reg_range(SLG51000_LDO1_MISC1, SLG51000_LDO1_VSEL_ACTUAL),
110 	regmap_reg_range(SLG51000_LDO1_EVENT, SLG51000_LDO1_IRQ_MASK),
111 	regmap_reg_range(SLG51000_LDO2_VSEL, SLG51000_LDO2_VSEL),
112 	regmap_reg_range(SLG51000_LDO2_MINV, SLG51000_LDO2_MAXV),
113 	regmap_reg_range(SLG51000_LDO2_MISC1, SLG51000_LDO2_VSEL_ACTUAL),
114 	regmap_reg_range(SLG51000_LDO2_EVENT, SLG51000_LDO2_IRQ_MASK),
115 	regmap_reg_range(SLG51000_LDO3_VSEL, SLG51000_LDO3_VSEL),
116 	regmap_reg_range(SLG51000_LDO3_MINV, SLG51000_LDO3_MAXV),
117 	regmap_reg_range(SLG51000_LDO3_CONF1, SLG51000_LDO3_VSEL_ACTUAL),
118 	regmap_reg_range(SLG51000_LDO3_EVENT, SLG51000_LDO3_IRQ_MASK),
119 	regmap_reg_range(SLG51000_LDO4_VSEL, SLG51000_LDO4_VSEL),
120 	regmap_reg_range(SLG51000_LDO4_MINV, SLG51000_LDO4_MAXV),
121 	regmap_reg_range(SLG51000_LDO4_CONF1, SLG51000_LDO4_VSEL_ACTUAL),
122 	regmap_reg_range(SLG51000_LDO4_EVENT, SLG51000_LDO4_IRQ_MASK),
123 	regmap_reg_range(SLG51000_LDO5_VSEL, SLG51000_LDO5_VSEL),
124 	regmap_reg_range(SLG51000_LDO5_MINV, SLG51000_LDO5_MAXV),
125 	regmap_reg_range(SLG51000_LDO5_TRIM2, SLG51000_LDO5_TRIM2),
126 	regmap_reg_range(SLG51000_LDO5_CONF1, SLG51000_LDO5_VSEL_ACTUAL),
127 	regmap_reg_range(SLG51000_LDO5_EVENT, SLG51000_LDO5_IRQ_MASK),
128 	regmap_reg_range(SLG51000_LDO6_VSEL, SLG51000_LDO6_VSEL),
129 	regmap_reg_range(SLG51000_LDO6_MINV, SLG51000_LDO6_MAXV),
130 	regmap_reg_range(SLG51000_LDO6_TRIM2, SLG51000_LDO6_TRIM2),
131 	regmap_reg_range(SLG51000_LDO6_CONF1, SLG51000_LDO6_VSEL_ACTUAL),
132 	regmap_reg_range(SLG51000_LDO6_EVENT, SLG51000_LDO6_IRQ_MASK),
133 	regmap_reg_range(SLG51000_LDO7_VSEL, SLG51000_LDO7_VSEL),
134 	regmap_reg_range(SLG51000_LDO7_MINV, SLG51000_LDO7_MAXV),
135 	regmap_reg_range(SLG51000_LDO7_CONF1, SLG51000_LDO7_VSEL_ACTUAL),
136 	regmap_reg_range(SLG51000_LDO7_EVENT, SLG51000_LDO7_IRQ_MASK),
137 	regmap_reg_range(SLG51000_OTP_EVENT, SLG51000_OTP_EVENT),
138 	regmap_reg_range(SLG51000_OTP_IRQ_MASK, SLG51000_OTP_IRQ_MASK),
139 	regmap_reg_range(SLG51000_OTP_LOCK_OTP_PROG, SLG51000_OTP_LOCK_CTRL),
140 	regmap_reg_range(SLG51000_LOCK_GLOBAL_LOCK_CTRL1,
141 			 SLG51000_LOCK_GLOBAL_LOCK_CTRL1),
142 };
143 
144 static const struct regmap_range slg51000_volatile_ranges[] = {
145 	regmap_reg_range(SLG51000_SYSCTL_FAULT_LOG1, SLG51000_SYSCTL_STATUS),
146 	regmap_reg_range(SLG51000_IO_GPIO_STATUS, SLG51000_IO_GPIO_STATUS),
147 	regmap_reg_range(SLG51000_LDO1_EVENT, SLG51000_LDO1_STATUS),
148 	regmap_reg_range(SLG51000_LDO2_EVENT, SLG51000_LDO2_STATUS),
149 	regmap_reg_range(SLG51000_LDO3_EVENT, SLG51000_LDO3_STATUS),
150 	regmap_reg_range(SLG51000_LDO4_EVENT, SLG51000_LDO4_STATUS),
151 	regmap_reg_range(SLG51000_LDO5_EVENT, SLG51000_LDO5_STATUS),
152 	regmap_reg_range(SLG51000_LDO6_EVENT, SLG51000_LDO6_STATUS),
153 	regmap_reg_range(SLG51000_LDO7_EVENT, SLG51000_LDO7_STATUS),
154 	regmap_reg_range(SLG51000_OTP_EVENT, SLG51000_OTP_EVENT),
155 };
156 
157 static const struct regmap_access_table slg51000_writeable_table = {
158 	.yes_ranges	= slg51000_writeable_ranges,
159 	.n_yes_ranges	= ARRAY_SIZE(slg51000_writeable_ranges),
160 };
161 
162 static const struct regmap_access_table slg51000_readable_table = {
163 	.yes_ranges	= slg51000_readable_ranges,
164 	.n_yes_ranges	= ARRAY_SIZE(slg51000_readable_ranges),
165 };
166 
167 static const struct regmap_access_table slg51000_volatile_table = {
168 	.yes_ranges	= slg51000_volatile_ranges,
169 	.n_yes_ranges	= ARRAY_SIZE(slg51000_volatile_ranges),
170 };
171 
172 static const struct regmap_config slg51000_regmap_config = {
173 	.reg_bits = 16,
174 	.val_bits = 8,
175 	.max_register = 0x8000,
176 	.wr_table = &slg51000_writeable_table,
177 	.rd_table = &slg51000_readable_table,
178 	.volatile_table = &slg51000_volatile_table,
179 };
180 
181 static const struct regulator_ops slg51000_regl_ops = {
182 	.enable = regulator_enable_regmap,
183 	.disable = regulator_disable_regmap,
184 	.is_enabled = regulator_is_enabled_regmap,
185 	.list_voltage = regulator_list_voltage_linear,
186 	.map_voltage = regulator_map_voltage_linear,
187 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
188 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
189 };
190 
191 static const struct regulator_ops slg51000_switch_ops = {
192 	.enable = regulator_enable_regmap,
193 	.disable = regulator_disable_regmap,
194 	.is_enabled = regulator_is_enabled_regmap,
195 };
196 
197 static int slg51000_of_parse_cb(struct device_node *np,
198 				const struct regulator_desc *desc,
199 				struct regulator_config *config)
200 {
201 	struct gpio_desc *ena_gpiod;
202 
203 	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
204 					   GPIOD_OUT_LOW |
205 						GPIOD_FLAGS_BIT_NONEXCLUSIVE,
206 					   "gpio-en-ldo");
207 	if (!IS_ERR(ena_gpiod))
208 		config->ena_gpiod = ena_gpiod;
209 
210 	return 0;
211 }
212 
213 #define SLG51000_REGL_DESC(_id, _name, _s_name, _min, _step) \
214 	[SLG51000_REGULATOR_##_id] = {                             \
215 		.name = #_name,                                    \
216 		.supply_name = _s_name,				   \
217 		.id = SLG51000_REGULATOR_##_id,                    \
218 		.of_match = of_match_ptr(#_name),                  \
219 		.of_parse_cb = slg51000_of_parse_cb,               \
220 		.ops = &slg51000_regl_ops,                         \
221 		.regulators_node = of_match_ptr("regulators"),     \
222 		.n_voltages = 256,                                 \
223 		.min_uV = _min,                                    \
224 		.uV_step = _step,                                  \
225 		.linear_min_sel = 0,                               \
226 		.vsel_mask = SLG51000_VSEL_MASK,                   \
227 		.vsel_reg = SLG51000_##_id##_VSEL,                 \
228 		.enable_reg = SLG51000_SYSCTL_MATRIX_CONF_A,       \
229 		.enable_mask = BIT(SLG51000_REGULATOR_##_id),      \
230 		.type = REGULATOR_VOLTAGE,                         \
231 		.owner = THIS_MODULE,                              \
232 	}
233 
234 static struct regulator_desc regls_desc[SLG51000_MAX_REGULATORS] = {
235 	SLG51000_REGL_DESC(LDO1, ldo1, NULL,   2400000,  5000),
236 	SLG51000_REGL_DESC(LDO2, ldo2, NULL,   2400000,  5000),
237 	SLG51000_REGL_DESC(LDO3, ldo3, "vin3", 1200000, 10000),
238 	SLG51000_REGL_DESC(LDO4, ldo4, "vin4", 1200000, 10000),
239 	SLG51000_REGL_DESC(LDO5, ldo5, "vin5",  400000,  5000),
240 	SLG51000_REGL_DESC(LDO6, ldo6, "vin6",  400000,  5000),
241 	SLG51000_REGL_DESC(LDO7, ldo7, "vin7", 1200000, 10000),
242 };
243 
244 static int slg51000_regulator_init(struct slg51000 *chip)
245 {
246 	struct regulator_config config = { };
247 	struct regulator_desc *rdesc;
248 	unsigned int reg, val;
249 	u8 vsel_range[2];
250 	int id, ret = 0;
251 	const unsigned int min_regs[SLG51000_MAX_REGULATORS] = {
252 		SLG51000_LDO1_MINV, SLG51000_LDO2_MINV, SLG51000_LDO3_MINV,
253 		SLG51000_LDO4_MINV, SLG51000_LDO5_MINV, SLG51000_LDO6_MINV,
254 		SLG51000_LDO7_MINV,
255 	};
256 
257 	for (id = 0; id < SLG51000_MAX_REGULATORS; id++) {
258 		chip->rdesc[id] = &regls_desc[id];
259 		rdesc = chip->rdesc[id];
260 		config.regmap = chip->regmap;
261 		config.dev = chip->dev;
262 		config.driver_data = chip;
263 
264 		ret = regmap_bulk_read(chip->regmap, min_regs[id],
265 				       vsel_range, 2);
266 		if (ret < 0) {
267 			dev_err(chip->dev,
268 				"Failed to read the MIN register\n");
269 			return ret;
270 		}
271 
272 		switch (id) {
273 		case SLG51000_REGULATOR_LDO1:
274 		case SLG51000_REGULATOR_LDO2:
275 			if (id == SLG51000_REGULATOR_LDO1)
276 				reg = SLG51000_LDO1_MISC1;
277 			else
278 				reg = SLG51000_LDO2_MISC1;
279 
280 			ret = regmap_read(chip->regmap, reg, &val);
281 			if (ret < 0) {
282 				dev_err(chip->dev,
283 					"Failed to read voltage range of ldo%d\n",
284 					id + 1);
285 				return ret;
286 			}
287 
288 			rdesc->linear_min_sel = vsel_range[0];
289 			rdesc->n_voltages = vsel_range[1] + 1;
290 			if (val & SLG51000_SEL_VRANGE_MASK)
291 				rdesc->min_uV = SLG51000_LDOHP_HV_MIN
292 						+ (vsel_range[0]
293 						   * rdesc->uV_step);
294 			else
295 				rdesc->min_uV = SLG51000_LDOHP_LV_MIN
296 						+ (vsel_range[0]
297 						   * rdesc->uV_step);
298 			break;
299 
300 		case SLG51000_REGULATOR_LDO5:
301 		case SLG51000_REGULATOR_LDO6:
302 			if (id == SLG51000_REGULATOR_LDO5)
303 				reg = SLG51000_LDO5_TRIM2;
304 			else
305 				reg = SLG51000_LDO6_TRIM2;
306 
307 			ret = regmap_read(chip->regmap, reg, &val);
308 			if (ret < 0) {
309 				dev_err(chip->dev,
310 					"Failed to read LDO mode register\n");
311 				return ret;
312 			}
313 
314 			if (val & SLG51000_SEL_BYP_MODE_MASK) {
315 				rdesc->ops = &slg51000_switch_ops;
316 				rdesc->n_voltages = 0;
317 				rdesc->min_uV = 0;
318 				rdesc->uV_step = 0;
319 				rdesc->linear_min_sel = 0;
320 				break;
321 			}
322 			fallthrough;	/* to the check below */
323 
324 		default:
325 			rdesc->linear_min_sel = vsel_range[0];
326 			rdesc->n_voltages = vsel_range[1] + 1;
327 			rdesc->min_uV = rdesc->min_uV
328 					+ (vsel_range[0] * rdesc->uV_step);
329 			break;
330 		}
331 
332 		chip->rdev[id] = devm_regulator_register(chip->dev, rdesc,
333 							 &config);
334 		if (IS_ERR(chip->rdev[id])) {
335 			ret = PTR_ERR(chip->rdev[id]);
336 			dev_err(chip->dev,
337 				"Failed to register regulator(%s):%d\n",
338 				chip->rdesc[id]->name, ret);
339 			return ret;
340 		}
341 	}
342 
343 	return 0;
344 }
345 
346 static irqreturn_t slg51000_irq_handler(int irq, void *data)
347 {
348 	struct slg51000 *chip = data;
349 	struct regmap *regmap = chip->regmap;
350 	enum { R0 = 0, R1, R2, REG_MAX };
351 	u8 evt[SLG51000_MAX_EVT_REGISTER][REG_MAX];
352 	int ret, i, handled = IRQ_NONE;
353 	unsigned int evt_otp, mask_otp;
354 
355 	/* Read event[R0], status[R1] and mask[R2] register */
356 	for (i = 0; i < SLG51000_MAX_EVT_REGISTER; i++) {
357 		ret = regmap_bulk_read(regmap, es_reg[i].ereg, evt[i], REG_MAX);
358 		if (ret < 0) {
359 			dev_err(chip->dev,
360 				"Failed to read event registers(%d)\n", ret);
361 			return IRQ_NONE;
362 		}
363 	}
364 
365 	ret = regmap_read(regmap, SLG51000_OTP_EVENT, &evt_otp);
366 	if (ret < 0) {
367 		dev_err(chip->dev,
368 			"Failed to read otp event registers(%d)\n", ret);
369 		return IRQ_NONE;
370 	}
371 
372 	ret = regmap_read(regmap, SLG51000_OTP_IRQ_MASK, &mask_otp);
373 	if (ret < 0) {
374 		dev_err(chip->dev,
375 			"Failed to read otp mask register(%d)\n", ret);
376 		return IRQ_NONE;
377 	}
378 
379 	if ((evt_otp & SLG51000_EVT_CRC_MASK) &&
380 	    !(mask_otp & SLG51000_IRQ_CRC_MASK)) {
381 		dev_info(chip->dev,
382 			 "OTP has been read or OTP crc is not zero\n");
383 		handled = IRQ_HANDLED;
384 	}
385 
386 	for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
387 		if (!(evt[i][R2] & SLG51000_IRQ_ILIM_FLAG_MASK) &&
388 		    (evt[i][R0] & SLG51000_EVT_ILIM_FLAG_MASK)) {
389 			regulator_notifier_call_chain(chip->rdev[i],
390 					    REGULATOR_EVENT_OVER_CURRENT, NULL);
391 
392 			if (evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK)
393 				dev_warn(chip->dev,
394 					 "Over-current limit(ldo%d)\n", i + 1);
395 			handled = IRQ_HANDLED;
396 		}
397 	}
398 
399 	if (!(evt[SLG51000_SCTL_EVT][R2] & SLG51000_IRQ_HIGH_TEMP_WARN_MASK) &&
400 	    (evt[SLG51000_SCTL_EVT][R0] & SLG51000_EVT_HIGH_TEMP_WARN_MASK)) {
401 		for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
402 			if (!(evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK) &&
403 			    (evt[i][R1] & SLG51000_STA_VOUT_OK_FLAG_MASK)) {
404 				regulator_notifier_call_chain(chip->rdev[i],
405 					       REGULATOR_EVENT_OVER_TEMP, NULL);
406 			}
407 		}
408 		handled = IRQ_HANDLED;
409 		if (evt[SLG51000_SCTL_EVT][R1] &
410 		    SLG51000_STA_HIGH_TEMP_WARN_MASK)
411 			dev_warn(chip->dev, "High temperature warning!\n");
412 	}
413 
414 	return handled;
415 }
416 
417 static void slg51000_clear_fault_log(struct slg51000 *chip)
418 {
419 	unsigned int val = 0;
420 	int ret = 0;
421 
422 	ret = regmap_read(chip->regmap, SLG51000_SYSCTL_FAULT_LOG1, &val);
423 	if (ret < 0) {
424 		dev_err(chip->dev, "Failed to read Fault log register\n");
425 		return;
426 	}
427 
428 	if (val & SLG51000_FLT_OVER_TEMP_MASK)
429 		dev_dbg(chip->dev, "Fault log: FLT_OVER_TEMP\n");
430 	if (val & SLG51000_FLT_POWER_SEQ_CRASH_REQ_MASK)
431 		dev_dbg(chip->dev, "Fault log: FLT_POWER_SEQ_CRASH_REQ\n");
432 	if (val & SLG51000_FLT_RST_MASK)
433 		dev_dbg(chip->dev, "Fault log: FLT_RST\n");
434 	if (val & SLG51000_FLT_POR_MASK)
435 		dev_dbg(chip->dev, "Fault log: FLT_POR\n");
436 }
437 
438 static int slg51000_i2c_probe(struct i2c_client *client)
439 {
440 	struct device *dev = &client->dev;
441 	struct slg51000 *chip;
442 	struct gpio_desc *cs_gpiod;
443 	int error, ret;
444 
445 	chip = devm_kzalloc(dev, sizeof(struct slg51000), GFP_KERNEL);
446 	if (!chip)
447 		return -ENOMEM;
448 
449 	cs_gpiod = devm_gpiod_get_optional(dev, "dlg,cs",
450 					   GPIOD_OUT_HIGH |
451 						GPIOD_FLAGS_BIT_NONEXCLUSIVE);
452 	if (IS_ERR(cs_gpiod))
453 		return PTR_ERR(cs_gpiod);
454 
455 	if (cs_gpiod) {
456 		dev_info(dev, "Found chip selector property\n");
457 		chip->cs_gpiod = cs_gpiod;
458 	}
459 
460 	usleep_range(10000, 11000);
461 
462 	i2c_set_clientdata(client, chip);
463 	chip->chip_irq = client->irq;
464 	chip->dev = dev;
465 	chip->regmap = devm_regmap_init_i2c(client, &slg51000_regmap_config);
466 	if (IS_ERR(chip->regmap)) {
467 		error = PTR_ERR(chip->regmap);
468 		dev_err(dev, "Failed to allocate register map: %d\n",
469 			error);
470 		return error;
471 	}
472 
473 	ret = slg51000_regulator_init(chip);
474 	if (ret < 0) {
475 		dev_err(chip->dev, "Failed to init regulator(%d)\n", ret);
476 		return ret;
477 	}
478 
479 	slg51000_clear_fault_log(chip);
480 
481 	if (chip->chip_irq) {
482 		ret = devm_request_threaded_irq(dev, chip->chip_irq, NULL,
483 						slg51000_irq_handler,
484 						(IRQF_TRIGGER_HIGH |
485 						IRQF_ONESHOT),
486 						"slg51000-irq", chip);
487 		if (ret != 0) {
488 			dev_err(dev, "Failed to request IRQ: %d\n",
489 				chip->chip_irq);
490 			return ret;
491 		}
492 	} else {
493 		dev_info(dev, "No IRQ configured\n");
494 	}
495 
496 	return ret;
497 }
498 
499 static const struct i2c_device_id slg51000_i2c_id[] = {
500 	{"slg51000", 0},
501 	{},
502 };
503 MODULE_DEVICE_TABLE(i2c, slg51000_i2c_id);
504 
505 static struct i2c_driver slg51000_regulator_driver = {
506 	.driver = {
507 		.name = "slg51000-regulator",
508 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
509 	},
510 	.probe = slg51000_i2c_probe,
511 	.id_table = slg51000_i2c_id,
512 };
513 
514 module_i2c_driver(slg51000_regulator_driver);
515 
516 MODULE_AUTHOR("Eric Jeong <eric.jeong.opensource@diasemi.com>");
517 MODULE_DESCRIPTION("SLG51000 regulator driver");
518 MODULE_LICENSE("GPL");
519 
520