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