1// SPDX-License-Identifier: GPL-2.0+
2//
3// mp5416.c  - regulator driver for mps mp5416
4//
5// Copyright 2020 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/platform_device.h>
14#include <linux/regmap.h>
15#include <linux/regulator/driver.h>
16#include <linux/i2c.h>
17
18#define MP5416_REG_CTL0			0x00
19#define MP5416_REG_CTL1			0x01
20#define MP5416_REG_CTL2			0x02
21#define MP5416_REG_ILIM			0x03
22#define MP5416_REG_BUCK1		0x04
23#define MP5416_REG_BUCK2		0x05
24#define MP5416_REG_BUCK3		0x06
25#define MP5416_REG_BUCK4		0x07
26#define MP5416_REG_LDO1			0x08
27#define MP5416_REG_LDO2			0x09
28#define MP5416_REG_LDO3			0x0a
29#define MP5416_REG_LDO4			0x0b
30
31#define MP5416_REGULATOR_EN		BIT(7)
32#define MP5416_MASK_VSET		0x7f
33#define MP5416_MASK_BUCK1_ILIM		0xc0
34#define MP5416_MASK_BUCK2_ILIM		0x0c
35#define MP5416_MASK_BUCK3_ILIM		0x30
36#define MP5416_MASK_BUCK4_ILIM		0x03
37#define MP5416_MASK_DVS_SLEWRATE	0xc0
38
39/* values in uV */
40#define MP5416_VOLT1_MIN		600000
41#define MP5416_VOLT1_MAX		2187500
42#define MP5416_VOLT1_STEP		12500
43#define MP5416_VOLT2_MIN		800000
44#define MP5416_VOLT2_MAX		3975000
45#define MP5416_VOLT2_STEP		25000
46
47#define MP5416_VOLT1_RANGE \
48	((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1)
49#define MP5416_VOLT2_RANGE \
50	((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1)
51
52#define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel)		\
53	[MP5416_BUCK ## _id] = {					\
54		.id = MP5416_BUCK ## _id,				\
55		.name = _name,						\
56		.of_match = _name,					\
57		.regulators_node = "regulators",			\
58		.ops = &mp5416_buck_ops,				\
59		.min_uV = MP5416_VOLT ##_vsel## _MIN,			\
60		.uV_step = MP5416_VOLT ##_vsel## _STEP,			\
61		.n_voltages = MP5416_VOLT ##_vsel## _RANGE,		\
62		.curr_table = _ilim,					\
63		.n_current_limits = ARRAY_SIZE(_ilim),			\
64		.csel_reg = MP5416_REG_ILIM,				\
65		.csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM,		\
66		.vsel_reg = MP5416_REG_BUCK ## _id,			\
67		.vsel_mask = MP5416_MASK_VSET,				\
68		.enable_reg = MP5416_REG_BUCK ## _id,			\
69		.enable_mask = MP5416_REGULATOR_EN,			\
70		.active_discharge_on	= _dval,			\
71		.active_discharge_reg	= _dreg,			\
72		.active_discharge_mask	= _dval,			\
73		.owner			= THIS_MODULE,			\
74	}
75
76#define MP5416LDO(_name, _id, _dval)					\
77	[MP5416_LDO ## _id] = {						\
78		.id = MP5416_LDO ## _id,				\
79		.name = _name,						\
80		.of_match = _name,					\
81		.regulators_node = "regulators",			\
82		.ops = &mp5416_ldo_ops,					\
83		.min_uV = MP5416_VOLT2_MIN,				\
84		.uV_step = MP5416_VOLT2_STEP,				\
85		.n_voltages = MP5416_VOLT2_RANGE,			\
86		.vsel_reg = MP5416_REG_LDO ##_id,			\
87		.vsel_mask = MP5416_MASK_VSET,				\
88		.enable_reg = MP5416_REG_LDO ##_id,			\
89		.enable_mask = MP5416_REGULATOR_EN,			\
90		.active_discharge_on	= _dval,			\
91		.active_discharge_reg	= MP5416_REG_CTL2,		\
92		.active_discharge_mask	= _dval,			\
93		.owner			= THIS_MODULE,			\
94	}
95
96enum mp5416_regulators {
97	MP5416_BUCK1,
98	MP5416_BUCK2,
99	MP5416_BUCK3,
100	MP5416_BUCK4,
101	MP5416_LDO1,
102	MP5416_LDO2,
103	MP5416_LDO3,
104	MP5416_LDO4,
105	MP5416_MAX_REGULATORS,
106};
107
108static const struct regmap_config mp5416_regmap_config = {
109	.reg_bits = 8,
110	.val_bits = 8,
111	.max_register = 0x0d,
112};
113
114/* Current limits array (in uA)
115 * ILIM1 & ILIM3
116 */
117static const unsigned int mp5416_I_limits1[] = {
118	3800000, 4600000, 5600000, 6800000
119};
120
121/* ILIM2 & ILIM4 */
122static const unsigned int mp5416_I_limits2[] = {
123	2200000, 3200000, 4200000, 5200000
124};
125
126static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
127
128static const struct regulator_ops mp5416_ldo_ops = {
129	.enable			= regulator_enable_regmap,
130	.disable		= regulator_disable_regmap,
131	.is_enabled		= regulator_is_enabled_regmap,
132	.list_voltage		= regulator_list_voltage_linear,
133	.map_voltage		= regulator_map_voltage_linear,
134	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
135	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
136	.set_active_discharge	= regulator_set_active_discharge_regmap,
137};
138
139static const struct regulator_ops mp5416_buck_ops = {
140	.enable			= regulator_enable_regmap,
141	.disable		= regulator_disable_regmap,
142	.is_enabled		= regulator_is_enabled_regmap,
143	.list_voltage		= regulator_list_voltage_linear,
144	.map_voltage		= regulator_map_voltage_linear,
145	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
146	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
147	.set_active_discharge	= regulator_set_active_discharge_regmap,
148	.get_current_limit	= regulator_get_current_limit_regmap,
149	.set_current_limit	= regulator_set_current_limit_regmap,
150	.set_ramp_delay		= mp5416_set_ramp_delay,
151};
152
153static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
154	MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
155	MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
156	MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
157	MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
158	MP5416LDO("ldo1", 1, BIT(4)),
159	MP5416LDO("ldo2", 2, BIT(3)),
160	MP5416LDO("ldo3", 3, BIT(2)),
161	MP5416LDO("ldo4", 4, BIT(1)),
162};
163
164/*
165 * DVS ramp rate BUCK1 to BUCK4
166 * 00: 32mV/us
167 * 01: 16mV/us
168 * 10: 8mV/us
169 * 11: 4mV/us
170 */
171static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
172{
173	unsigned int ramp_val;
174
175	if (ramp_delay > 32000 || ramp_delay < 0)
176		return -EINVAL;
177
178	if (ramp_delay <= 4000)
179		ramp_val = 3;
180	else if (ramp_delay <= 8000)
181		ramp_val = 2;
182	else if (ramp_delay <= 16000)
183		ramp_val = 1;
184	else
185		ramp_val = 0;
186
187	return regmap_update_bits(rdev->regmap, MP5416_REG_CTL2,
188				  MP5416_MASK_DVS_SLEWRATE, ramp_val << 6);
189}
190
191static int mp5416_i2c_probe(struct i2c_client *client)
192{
193	struct device *dev = &client->dev;
194	struct regulator_config config = { NULL, };
195	struct regulator_dev *rdev;
196	struct regmap *regmap;
197	int i;
198
199	regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
200	if (IS_ERR(regmap)) {
201		dev_err(dev, "Failed to allocate regmap!\n");
202		return PTR_ERR(regmap);
203	}
204
205	config.dev = dev;
206	config.regmap = regmap;
207
208	for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
209		rdev = devm_regulator_register(dev,
210					       &mp5416_regulators_desc[i],
211					       &config);
212		if (IS_ERR(rdev)) {
213			dev_err(dev, "Failed to register regulator!\n");
214			return PTR_ERR(rdev);
215		}
216	}
217
218	return 0;
219}
220
221static const struct of_device_id mp5416_of_match[] = {
222	{ .compatible = "mps,mp5416" },
223	{},
224};
225MODULE_DEVICE_TABLE(of, mp5416_of_match);
226
227static const struct i2c_device_id mp5416_id[] = {
228	{ "mp5416", },
229	{ },
230};
231MODULE_DEVICE_TABLE(i2c, mp5416_id);
232
233static struct i2c_driver mp5416_regulator_driver = {
234	.driver = {
235		.name = "mp5416",
236		.of_match_table = of_match_ptr(mp5416_of_match),
237	},
238	.probe_new = mp5416_i2c_probe,
239	.id_table = mp5416_id,
240};
241module_i2c_driver(mp5416_regulator_driver);
242
243MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
244MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
245MODULE_LICENSE("GPL");
246