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 
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 
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, &regulators[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