1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Regulator driver for LP87565 PMIC
4  *
5  * Copyright (C) 2017 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/lp87565.h>
13 
14 enum LP87565_regulator_id {
15 	/* BUCK's */
16 	LP87565_BUCK_0,
17 	LP87565_BUCK_1,
18 	LP87565_BUCK_2,
19 	LP87565_BUCK_3,
20 	LP87565_BUCK_10,
21 	LP87565_BUCK_23,
22 	LP87565_BUCK_3210,
23 };
24 
25 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm,		\
26 			  _er, _em, _ev, _delay, _lr, _cr)		\
27 	[_id] = {							\
28 		.desc = {						\
29 			.name			= _name,		\
30 			.supply_name		= _of "-in",		\
31 			.id			= _id,			\
32 			.of_match		= _of,			\
33 			.regulators_node	= "regulators",		\
34 			.ops			= &_ops,		\
35 			.n_voltages		= _n,			\
36 			.type			= REGULATOR_VOLTAGE,	\
37 			.owner			= THIS_MODULE,		\
38 			.vsel_reg		= _vr,			\
39 			.vsel_mask		= _vm,			\
40 			.enable_reg		= _er,			\
41 			.enable_mask		= _em,			\
42 			.enable_val		= _ev,			\
43 			.ramp_delay		= _delay,		\
44 			.linear_ranges		= _lr,			\
45 			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
46 			.curr_table = lp87565_buck_uA,			\
47 			.n_current_limits = ARRAY_SIZE(lp87565_buck_uA),\
48 			.csel_reg = (_cr),				\
49 			.csel_mask = LP87565_BUCK_CTRL_2_ILIM,		\
50 		},							\
51 		.ctrl2_reg = _cr,					\
52 	}
53 
54 struct lp87565_regulator {
55 	struct regulator_desc desc;
56 	unsigned int ctrl2_reg;
57 };
58 
59 static const struct lp87565_regulator regulators[];
60 
61 static const struct linear_range buck0_1_2_3_ranges[] = {
62 	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
63 	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
64 	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
65 };
66 
67 static const unsigned int lp87565_buck_ramp_delay[] = {
68 	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
69 };
70 
71 /* LP87565 BUCK current limit */
72 static const unsigned int lp87565_buck_uA[] = {
73 	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
74 };
75 
lp87565_buck_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)76 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
77 				       int ramp_delay)
78 {
79 	int id = rdev_get_id(rdev);
80 	unsigned int reg;
81 	int ret;
82 
83 	if (ramp_delay <= 470)
84 		reg = 7;
85 	else if (ramp_delay <= 940)
86 		reg = 6;
87 	else if (ramp_delay <= 1900)
88 		reg = 5;
89 	else if (ramp_delay <= 3800)
90 		reg = 4;
91 	else if (ramp_delay <= 7500)
92 		reg = 3;
93 	else if (ramp_delay <= 10000)
94 		reg = 2;
95 	else if (ramp_delay <= 15000)
96 		reg = 1;
97 	else
98 		reg = 0;
99 
100 	ret = regmap_update_bits(rdev->regmap, regulators[id].ctrl2_reg,
101 				 LP87565_BUCK_CTRL_2_SLEW_RATE,
102 				 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
103 	if (ret) {
104 		dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
105 		return ret;
106 	}
107 
108 	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
109 
110 	/* Conservatively give a 15% margin */
111 	rdev->constraints->ramp_delay =
112 				rdev->constraints->ramp_delay * 85 / 100;
113 
114 	return 0;
115 }
116 
117 /* Operations permitted on BUCKs */
118 static const struct regulator_ops lp87565_buck_ops = {
119 	.is_enabled		= regulator_is_enabled_regmap,
120 	.enable			= regulator_enable_regmap,
121 	.disable		= regulator_disable_regmap,
122 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
123 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
124 	.list_voltage		= regulator_list_voltage_linear_range,
125 	.map_voltage		= regulator_map_voltage_linear_range,
126 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
127 	.set_ramp_delay		= lp87565_buck_set_ramp_delay,
128 	.set_current_limit	= regulator_set_current_limit_regmap,
129 	.get_current_limit	= regulator_get_current_limit_regmap,
130 };
131 
132 static const struct lp87565_regulator regulators[] = {
133 	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
134 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
135 			  LP87565_REG_BUCK0_CTRL_1,
136 			  LP87565_BUCK_CTRL_1_EN |
137 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
138 			  LP87565_BUCK_CTRL_1_EN, 3230,
139 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
140 	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
141 			  256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
142 			  LP87565_REG_BUCK1_CTRL_1,
143 			  LP87565_BUCK_CTRL_1_EN |
144 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
145 			  LP87565_BUCK_CTRL_1_EN, 3230,
146 			  buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
147 	LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
148 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
149 			  LP87565_REG_BUCK2_CTRL_1,
150 			  LP87565_BUCK_CTRL_1_EN |
151 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
152 			  LP87565_BUCK_CTRL_1_EN, 3230,
153 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
154 	LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
155 			  256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
156 			  LP87565_REG_BUCK3_CTRL_1,
157 			  LP87565_BUCK_CTRL_1_EN |
158 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
159 			  LP87565_BUCK_CTRL_1_EN, 3230,
160 			  buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
161 	LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
162 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
163 			  LP87565_REG_BUCK0_CTRL_1,
164 			  LP87565_BUCK_CTRL_1_EN |
165 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
166 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
167 			  LP87565_BUCK_CTRL_1_EN |
168 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
169 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
170 	LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
171 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
172 			  LP87565_REG_BUCK2_CTRL_1,
173 			  LP87565_BUCK_CTRL_1_EN |
174 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
175 			  LP87565_BUCK_CTRL_1_EN, 3230,
176 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
177 	LP87565_REGULATOR("BUCK3210", LP87565_BUCK_3210, "buck3210",
178 			  lp87565_buck_ops, 256, LP87565_REG_BUCK0_VOUT,
179 			  LP87565_BUCK_VSET, LP87565_REG_BUCK0_CTRL_1,
180 			  LP87565_BUCK_CTRL_1_EN |
181 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
182 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
183 			  LP87565_BUCK_CTRL_1_EN |
184 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
185 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
186 };
187 
lp87565_regulator_probe(struct platform_device * pdev)188 static int lp87565_regulator_probe(struct platform_device *pdev)
189 {
190 	struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
191 	struct regulator_config config = { };
192 	struct regulator_dev *rdev;
193 	int i, min_idx, max_idx;
194 
195 	platform_set_drvdata(pdev, lp87565);
196 
197 	config.dev = &pdev->dev;
198 	config.dev->of_node = lp87565->dev->of_node;
199 	config.driver_data = lp87565;
200 	config.regmap = lp87565->regmap;
201 
202 	switch (lp87565->dev_type) {
203 	case LP87565_DEVICE_TYPE_LP87565_Q1:
204 		min_idx = LP87565_BUCK_10;
205 		max_idx = LP87565_BUCK_23;
206 		break;
207 	case LP87565_DEVICE_TYPE_LP87561_Q1:
208 		min_idx = LP87565_BUCK_3210;
209 		max_idx = LP87565_BUCK_3210;
210 		break;
211 	default:
212 		min_idx = LP87565_BUCK_0;
213 		max_idx = LP87565_BUCK_3;
214 		break;
215 	}
216 
217 	for (i = min_idx; i <= max_idx; i++) {
218 		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
219 					       &config);
220 		if (IS_ERR(rdev)) {
221 			dev_err(lp87565->dev, "failed to register %s regulator\n",
222 				pdev->name);
223 			return PTR_ERR(rdev);
224 		}
225 	}
226 
227 	return 0;
228 }
229 
230 static const struct platform_device_id lp87565_regulator_id_table[] = {
231 	{ "lp87565-regulator", },
232 	{ "lp87565-q1-regulator", },
233 	{ /* sentinel */ }
234 };
235 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
236 
237 static struct platform_driver lp87565_regulator_driver = {
238 	.driver = {
239 		.name = "lp87565-pmic",
240 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
241 	},
242 	.probe = lp87565_regulator_probe,
243 	.id_table = lp87565_regulator_id_table,
244 };
245 module_platform_driver(lp87565_regulator_driver);
246 
247 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
248 MODULE_DESCRIPTION("LP87565 voltage regulator driver");
249 MODULE_LICENSE("GPL v2");
250