1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Regulator driver for LP873X PMIC
4 *
5 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/regmap.h>
12
13 #include <linux/mfd/lp873x.h>
14
15 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
16 _delay, _lr, _cr) \
17 [_id] = { \
18 .desc = { \
19 .name = _name, \
20 .supply_name = _of "-in", \
21 .id = _id, \
22 .of_match = of_match_ptr(_of), \
23 .regulators_node = of_match_ptr("regulators"),\
24 .ops = &_ops, \
25 .n_voltages = _n, \
26 .type = REGULATOR_VOLTAGE, \
27 .owner = THIS_MODULE, \
28 .vsel_reg = _vr, \
29 .vsel_mask = _vm, \
30 .enable_reg = _er, \
31 .enable_mask = _em, \
32 .ramp_delay = _delay, \
33 .linear_ranges = _lr, \
34 .n_linear_ranges = ARRAY_SIZE(_lr), \
35 .curr_table = lp873x_buck_uA, \
36 .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
37 .csel_reg = (_cr), \
38 .csel_mask = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
39 }, \
40 .ctrl2_reg = _cr, \
41 }
42
43 struct lp873x_regulator {
44 struct regulator_desc desc;
45 unsigned int ctrl2_reg;
46 };
47
48 static const struct lp873x_regulator regulators[];
49
50 static const struct linear_range buck0_buck1_ranges[] = {
51 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
52 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
53 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
54 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
55 };
56
57 static const struct linear_range ldo0_ldo1_ranges[] = {
58 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
59 };
60
61 static const unsigned int lp873x_buck_ramp_delay[] = {
62 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
63 };
64
65 /* LP873X BUCK current limit */
66 static const unsigned int lp873x_buck_uA[] = {
67 1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
68 };
69
lp873x_buck_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)70 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
71 int ramp_delay)
72 {
73 int id = rdev_get_id(rdev);
74 struct lp873x *lp873 = rdev_get_drvdata(rdev);
75 unsigned int reg;
76 int ret;
77
78 if (ramp_delay <= 470)
79 reg = 7;
80 else if (ramp_delay <= 940)
81 reg = 6;
82 else if (ramp_delay <= 1900)
83 reg = 5;
84 else if (ramp_delay <= 3800)
85 reg = 4;
86 else if (ramp_delay <= 7500)
87 reg = 3;
88 else if (ramp_delay <= 10000)
89 reg = 2;
90 else if (ramp_delay <= 15000)
91 reg = 1;
92 else
93 reg = 0;
94
95 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
96 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
97 FIELD_PREP(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, reg));
98 if (ret) {
99 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
100 return ret;
101 }
102
103 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
104
105 return 0;
106 }
107
108 /* Operations permitted on BUCK0, BUCK1 */
109 static const struct regulator_ops lp873x_buck01_ops = {
110 .is_enabled = regulator_is_enabled_regmap,
111 .enable = regulator_enable_regmap,
112 .disable = regulator_disable_regmap,
113 .get_voltage_sel = regulator_get_voltage_sel_regmap,
114 .set_voltage_sel = regulator_set_voltage_sel_regmap,
115 .list_voltage = regulator_list_voltage_linear_range,
116 .map_voltage = regulator_map_voltage_linear_range,
117 .set_voltage_time_sel = regulator_set_voltage_time_sel,
118 .set_ramp_delay = lp873x_buck_set_ramp_delay,
119 .set_current_limit = regulator_set_current_limit_regmap,
120 .get_current_limit = regulator_get_current_limit_regmap,
121 };
122
123 /* Operations permitted on LDO0 and LDO1 */
124 static const struct regulator_ops lp873x_ldo01_ops = {
125 .is_enabled = regulator_is_enabled_regmap,
126 .enable = regulator_enable_regmap,
127 .disable = regulator_disable_regmap,
128 .get_voltage_sel = regulator_get_voltage_sel_regmap,
129 .set_voltage_sel = regulator_set_voltage_sel_regmap,
130 .list_voltage = regulator_list_voltage_linear_range,
131 .map_voltage = regulator_map_voltage_linear_range,
132 };
133
134 static const struct lp873x_regulator regulators[] = {
135 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
136 256, LP873X_REG_BUCK0_VOUT,
137 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
138 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
139 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
140 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
141 256, LP873X_REG_BUCK1_VOUT,
142 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
143 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
144 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
145 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
146 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
147 LP873X_REG_LDO0_CTRL,
148 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
149 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
150 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
151 LP873X_REG_LDO1_CTRL,
152 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
153 };
154
lp873x_regulator_probe(struct platform_device * pdev)155 static int lp873x_regulator_probe(struct platform_device *pdev)
156 {
157 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
158 struct regulator_config config = { };
159 struct regulator_dev *rdev;
160 int i;
161
162 platform_set_drvdata(pdev, lp873);
163
164 config.dev = &pdev->dev;
165 config.dev->of_node = lp873->dev->of_node;
166 config.driver_data = lp873;
167 config.regmap = lp873->regmap;
168
169 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
170 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
171 &config);
172 if (IS_ERR(rdev)) {
173 dev_err(lp873->dev, "failed to register %s regulator\n",
174 pdev->name);
175 return PTR_ERR(rdev);
176 }
177 }
178
179 return 0;
180 }
181
182 static const struct platform_device_id lp873x_regulator_id_table[] = {
183 { "lp873x-regulator", },
184 { /* sentinel */ }
185 };
186 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
187
188 static struct platform_driver lp873x_regulator_driver = {
189 .driver = {
190 .name = "lp873x-pmic",
191 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
192 },
193 .probe = lp873x_regulator_probe,
194 .id_table = lp873x_regulator_id_table,
195 };
196 module_platform_driver(lp873x_regulator_driver);
197
198 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
199 MODULE_DESCRIPTION("LP873X voltage regulator driver");
200 MODULE_ALIAS("platform:lp873x-pmic");
201 MODULE_LICENSE("GPL v2");
202