1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // mpq7920.c - regulator driver for mps mpq7920
4 //
5 // Copyright 2019 Monolithic Power Systems, Inc
6 //
7 // Author: Saravanan Sekar <sravanhome@gmail.com>
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/i2c.h>
19 #include <linux/regmap.h>
20 #include "mpq7920.h"
21
22 #define MPQ7920_BUCK_VOLT_RANGE \
23 ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
24 #define MPQ7920_LDO_VOLT_RANGE \
25 ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
26
27 #define MPQ7920BUCK(_name, _id, _ilim) \
28 [MPQ7920_BUCK ## _id] = { \
29 .id = MPQ7920_BUCK ## _id, \
30 .name = _name, \
31 .of_match = _name, \
32 .regulators_node = "regulators", \
33 .of_parse_cb = mpq7920_parse_cb, \
34 .ops = &mpq7920_buck_ops, \
35 .min_uV = MPQ7920_BUCK_VOLT_MIN, \
36 .uV_step = MPQ7920_VOLT_STEP, \
37 .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \
38 .curr_table = _ilim, \
39 .n_current_limits = ARRAY_SIZE(_ilim), \
40 .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \
41 .csel_mask = MPQ7920_MASK_BUCK_ILIM, \
42 .enable_reg = MPQ7920_REG_REGULATOR_EN, \
43 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
44 MPQ7920_BUCK ## _id), \
45 .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \
46 .vsel_mask = MPQ7920_MASK_VREF, \
47 .active_discharge_on = MPQ7920_DISCHARGE_ON, \
48 .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \
49 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
50 .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \
51 .soft_start_mask = MPQ7920_MASK_SOFTSTART, \
52 .owner = THIS_MODULE, \
53 }
54
55 #define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \
56 [MPQ7920_LDO ## _id] = { \
57 .id = MPQ7920_LDO ## _id, \
58 .name = _name, \
59 .of_match = _name, \
60 .regulators_node = "regulators", \
61 .ops = _ops, \
62 .min_uV = MPQ7920_LDO_VOLT_MIN, \
63 .uV_step = MPQ7920_VOLT_STEP, \
64 .n_voltages = MPQ7920_LDO_VOLT_RANGE, \
65 .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \
66 .vsel_mask = MPQ7920_MASK_VREF, \
67 .curr_table = _ilim, \
68 .n_current_limits = _ilim_sz, \
69 .csel_reg = _creg, \
70 .csel_mask = _cmask, \
71 .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\
72 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
73 MPQ7920_LDO ##_id + 1), \
74 .active_discharge_on = MPQ7920_DISCHARGE_ON, \
75 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
76 .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \
77 .type = REGULATOR_VOLTAGE, \
78 .owner = THIS_MODULE, \
79 }
80
81 enum mpq7920_regulators {
82 MPQ7920_BUCK1,
83 MPQ7920_BUCK2,
84 MPQ7920_BUCK3,
85 MPQ7920_BUCK4,
86 MPQ7920_LDO1, /* LDORTC */
87 MPQ7920_LDO2,
88 MPQ7920_LDO3,
89 MPQ7920_LDO4,
90 MPQ7920_LDO5,
91 MPQ7920_MAX_REGULATORS,
92 };
93
94 struct mpq7920_regulator_info {
95 struct regmap *regmap;
96 struct regulator_desc *rdesc;
97 };
98
99 static const struct regmap_config mpq7920_regmap_config = {
100 .reg_bits = 8,
101 .val_bits = 8,
102 .max_register = 0x25,
103 };
104
105 /* Current limits array (in uA)
106 * ILIM1 & ILIM3
107 */
108 static const unsigned int mpq7920_I_limits1[] = {
109 4600000, 6600000, 7600000, 9300000
110 };
111
112 /* ILIM2 & ILIM4 */
113 static const unsigned int mpq7920_I_limits2[] = {
114 2700000, 3900000, 5100000, 6100000
115 };
116
117 /* LDO4 & LDO5 */
118 static const unsigned int mpq7920_I_limits3[] = {
119 300000, 700000
120 };
121
122 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
123 static int mpq7920_parse_cb(struct device_node *np,
124 const struct regulator_desc *rdesc,
125 struct regulator_config *config);
126
127 /* RTCLDO not controllable, always ON */
128 static const struct regulator_ops mpq7920_ldortc_ops = {
129 .list_voltage = regulator_list_voltage_linear,
130 .map_voltage = regulator_map_voltage_linear,
131 .get_voltage_sel = regulator_get_voltage_sel_regmap,
132 .set_voltage_sel = regulator_set_voltage_sel_regmap,
133 };
134
135 static const struct regulator_ops mpq7920_ldo_wo_current_ops = {
136 .enable = regulator_enable_regmap,
137 .disable = regulator_disable_regmap,
138 .is_enabled = regulator_is_enabled_regmap,
139 .list_voltage = regulator_list_voltage_linear,
140 .map_voltage = regulator_map_voltage_linear,
141 .get_voltage_sel = regulator_get_voltage_sel_regmap,
142 .set_voltage_sel = regulator_set_voltage_sel_regmap,
143 .set_active_discharge = regulator_set_active_discharge_regmap,
144 };
145
146 static const struct regulator_ops mpq7920_ldo_ops = {
147 .enable = regulator_enable_regmap,
148 .disable = regulator_disable_regmap,
149 .is_enabled = regulator_is_enabled_regmap,
150 .list_voltage = regulator_list_voltage_linear,
151 .map_voltage = regulator_map_voltage_linear,
152 .get_voltage_sel = regulator_get_voltage_sel_regmap,
153 .set_voltage_sel = regulator_set_voltage_sel_regmap,
154 .set_active_discharge = regulator_set_active_discharge_regmap,
155 .get_current_limit = regulator_get_current_limit_regmap,
156 .set_current_limit = regulator_set_current_limit_regmap,
157 };
158
159 static const struct regulator_ops mpq7920_buck_ops = {
160 .enable = regulator_enable_regmap,
161 .disable = regulator_disable_regmap,
162 .is_enabled = regulator_is_enabled_regmap,
163 .list_voltage = regulator_list_voltage_linear,
164 .map_voltage = regulator_map_voltage_linear,
165 .get_voltage_sel = regulator_get_voltage_sel_regmap,
166 .set_voltage_sel = regulator_set_voltage_sel_regmap,
167 .set_active_discharge = regulator_set_active_discharge_regmap,
168 .set_soft_start = regulator_set_soft_start_regmap,
169 .set_ramp_delay = mpq7920_set_ramp_delay,
170 };
171
172 static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {
173 MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),
174 MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),
175 MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),
176 MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),
177 MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),
178 MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
179 MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
180 MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,
181 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,
182 MPQ7920_MASK_LDO_ILIM),
183 MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,
184 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,
185 MPQ7920_MASK_LDO_ILIM),
186 };
187
188 /*
189 * DVS ramp rate BUCK1 to BUCK4
190 * 00-01: Reserved
191 * 10: 8mV/us
192 * 11: 4mV/us
193 */
mpq7920_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)194 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
195 {
196 unsigned int ramp_val;
197
198 if (ramp_delay > 8000 || ramp_delay < 0)
199 return -EINVAL;
200
201 if (ramp_delay <= 4000)
202 ramp_val = 3;
203 else
204 ramp_val = 2;
205
206 return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,
207 MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);
208 }
209
mpq7920_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)210 static int mpq7920_parse_cb(struct device_node *np,
211 const struct regulator_desc *desc,
212 struct regulator_config *config)
213 {
214 uint8_t val;
215 int ret;
216 struct mpq7920_regulator_info *info = config->driver_data;
217 struct regulator_desc *rdesc = &info->rdesc[desc->id];
218
219 if (of_property_read_bool(np, "mps,buck-ovp-disable")) {
220 regmap_update_bits(config->regmap,
221 MPQ7920_BUCK1_REG_B + (rdesc->id * 4),
222 MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);
223 }
224
225 ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);
226 if (!ret) {
227 regmap_update_bits(config->regmap,
228 MPQ7920_BUCK1_REG_C + (rdesc->id * 4),
229 MPQ7920_MASK_BUCK_PHASE_DEALY,
230 (val & 3) << 4);
231 }
232
233 ret = of_property_read_u8(np, "mps,buck-softstart", &val);
234 if (!ret)
235 rdesc->soft_start_val_on = (val & 3) << 2;
236
237 return 0;
238 }
239
mpq7920_parse_dt(struct device * dev,struct mpq7920_regulator_info * info)240 static void mpq7920_parse_dt(struct device *dev,
241 struct mpq7920_regulator_info *info)
242 {
243 int ret;
244 struct device_node *np = dev->of_node;
245 uint8_t freq;
246
247 np = of_get_child_by_name(np, "regulators");
248 if (!np) {
249 dev_err(dev, "missing 'regulators' subnode in DT\n");
250 return;
251 }
252
253 ret = of_property_read_u8(np, "mps,switch-freq", &freq);
254 if (!ret) {
255 regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,
256 MPQ7920_MASK_SWITCH_FREQ,
257 (freq & 3) << 4);
258 }
259
260 of_node_put(np);
261 }
262
mpq7920_i2c_probe(struct i2c_client * client)263 static int mpq7920_i2c_probe(struct i2c_client *client)
264 {
265 struct device *dev = &client->dev;
266 struct mpq7920_regulator_info *info;
267 struct regulator_config config = { NULL, };
268 struct regulator_dev *rdev;
269 struct regmap *regmap;
270 int i;
271
272 info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),
273 GFP_KERNEL);
274 if (!info)
275 return -ENOMEM;
276
277 info->rdesc = mpq7920_regulators_desc;
278 regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config);
279 if (IS_ERR(regmap)) {
280 dev_err(dev, "Failed to allocate regmap!\n");
281 return PTR_ERR(regmap);
282 }
283
284 i2c_set_clientdata(client, info);
285 info->regmap = regmap;
286 if (client->dev.of_node)
287 mpq7920_parse_dt(&client->dev, info);
288
289 config.dev = dev;
290 config.regmap = regmap;
291 config.driver_data = info;
292
293 for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {
294 rdev = devm_regulator_register(dev,
295 &mpq7920_regulators_desc[i],
296 &config);
297 if (IS_ERR(rdev)) {
298 dev_err(dev, "Failed to register regulator!\n");
299 return PTR_ERR(rdev);
300 }
301 }
302
303 return 0;
304 }
305
306 static const struct of_device_id mpq7920_of_match[] = {
307 { .compatible = "mps,mpq7920"},
308 {},
309 };
310 MODULE_DEVICE_TABLE(of, mpq7920_of_match);
311
312 static const struct i2c_device_id mpq7920_id[] = {
313 { "mpq7920", },
314 { },
315 };
316 MODULE_DEVICE_TABLE(i2c, mpq7920_id);
317
318 static struct i2c_driver mpq7920_regulator_driver = {
319 .driver = {
320 .name = "mpq7920",
321 .of_match_table = of_match_ptr(mpq7920_of_match),
322 },
323 .probe_new = mpq7920_i2c_probe,
324 .id_table = mpq7920_id,
325 };
326 module_i2c_driver(mpq7920_regulator_driver);
327
328 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
329 MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");
330 MODULE_LICENSE("GPL");
331
