1e7314653SIskren Chernev // SPDX-License-Identifier: GPL-2.0-or-later
2e7314653SIskren Chernev //
3e7314653SIskren Chernev // max77826-regulator.c - regulator driver for Maxim MAX77826
4e7314653SIskren Chernev //
5e7314653SIskren Chernev // Author: Iskren Chernev <iskren.chernev@gmail.com>
6e7314653SIskren Chernev
7e7314653SIskren Chernev #include <linux/kernel.h>
8e7314653SIskren Chernev #include <linux/module.h>
9e7314653SIskren Chernev #include <linux/init.h>
10e7314653SIskren Chernev #include <linux/err.h>
11e7314653SIskren Chernev #include <linux/of.h>
12e7314653SIskren Chernev #include <linux/platform_device.h>
13e7314653SIskren Chernev #include <linux/regulator/driver.h>
14e7314653SIskren Chernev #include <linux/regulator/of_regulator.h>
15e7314653SIskren Chernev #include <linux/i2c.h>
16e7314653SIskren Chernev #include <linux/regmap.h>
17e7314653SIskren Chernev
18e7314653SIskren Chernev enum max77826_registers {
19e7314653SIskren Chernev MAX77826_REG_INT_SRC = 0x00,
20e7314653SIskren Chernev MAX77826_REG_SYS_INT,
21e7314653SIskren Chernev MAX77826_REG_INT1,
22e7314653SIskren Chernev MAX77826_REG_INT2,
23e7314653SIskren Chernev MAX77826_REG_BB_INT,
24e7314653SIskren Chernev MAX77826_REG_INT_SRC_M,
25e7314653SIskren Chernev MAX77826_REG_TOPSYS_INT_M,
26e7314653SIskren Chernev MAX77826_REG_INT1_M,
27e7314653SIskren Chernev MAX77826_REG_INT2_M,
28e7314653SIskren Chernev MAX77826_REG_BB_INT_M,
29e7314653SIskren Chernev MAX77826_REG_TOPSYS_STAT,
30e7314653SIskren Chernev MAX77826_REG_STAT1,
31e7314653SIskren Chernev MAX77826_REG_STAT2,
32e7314653SIskren Chernev MAX77826_REG_BB_STAT,
33e7314653SIskren Chernev /* 0x0E - 0x0F: Reserved */
34e7314653SIskren Chernev MAX77826_REG_LDO_OPMD1 = 0x10,
35e7314653SIskren Chernev MAX77826_REG_LDO_OPMD2,
36e7314653SIskren Chernev MAX77826_REG_LDO_OPMD3,
37e7314653SIskren Chernev MAX77826_REG_LDO_OPMD4,
38e7314653SIskren Chernev MAX77826_REG_B_BB_OPMD,
39e7314653SIskren Chernev /* 0x15 - 0x1F: Reserved */
40e7314653SIskren Chernev MAX77826_REG_LDO1_CFG = 0x20,
41e7314653SIskren Chernev MAX77826_REG_LDO2_CFG,
42e7314653SIskren Chernev MAX77826_REG_LDO3_CFG,
43e7314653SIskren Chernev MAX77826_REG_LDO4_CFG,
44e7314653SIskren Chernev MAX77826_REG_LDO5_CFG,
45e7314653SIskren Chernev MAX77826_REG_LDO6_CFG,
46e7314653SIskren Chernev MAX77826_REG_LDO7_CFG,
47e7314653SIskren Chernev MAX77826_REG_LDO8_CFG,
48e7314653SIskren Chernev MAX77826_REG_LDO9_CFG,
49e7314653SIskren Chernev MAX77826_REG_LDO10_CFG,
50e7314653SIskren Chernev MAX77826_REG_LDO11_CFG,
51e7314653SIskren Chernev MAX77826_REG_LDO12_CFG,
52e7314653SIskren Chernev MAX77826_REG_LDO13_CFG,
53e7314653SIskren Chernev MAX77826_REG_LDO14_CFG,
54e7314653SIskren Chernev MAX77826_REG_LDO15_CFG,
55e7314653SIskren Chernev /* 0x2F: Reserved */
56e7314653SIskren Chernev MAX77826_REG_BUCK_CFG = 0x30,
57e7314653SIskren Chernev MAX77826_REG_BUCK_VOUT,
58e7314653SIskren Chernev MAX77826_REG_BB_CFG,
59e7314653SIskren Chernev MAX77826_REG_BB_VOUT,
60e7314653SIskren Chernev /* 0x34 - 0x3F: Reserved */
61e7314653SIskren Chernev MAX77826_REG_BUCK_SS_FREQ = 0x40,
62e7314653SIskren Chernev MAX77826_REG_UVLO_FALL,
63e7314653SIskren Chernev /* 0x42 - 0xCE: Reserved */
64e7314653SIskren Chernev MAX77826_REG_DEVICE_ID = 0xCF,
65e7314653SIskren Chernev };
66e7314653SIskren Chernev
67e7314653SIskren Chernev enum max77826_regulators {
68e7314653SIskren Chernev MAX77826_LDO1 = 0,
69e7314653SIskren Chernev MAX77826_LDO2,
70e7314653SIskren Chernev MAX77826_LDO3,
71e7314653SIskren Chernev MAX77826_LDO4,
72e7314653SIskren Chernev MAX77826_LDO5,
73e7314653SIskren Chernev MAX77826_LDO6,
74e7314653SIskren Chernev MAX77826_LDO7,
75e7314653SIskren Chernev MAX77826_LDO8,
76e7314653SIskren Chernev MAX77826_LDO9,
77e7314653SIskren Chernev MAX77826_LDO10,
78e7314653SIskren Chernev MAX77826_LDO11,
79e7314653SIskren Chernev MAX77826_LDO12,
80e7314653SIskren Chernev MAX77826_LDO13,
81e7314653SIskren Chernev MAX77826_LDO14,
82e7314653SIskren Chernev MAX77826_LDO15,
83e7314653SIskren Chernev MAX77826_BUCK,
84e7314653SIskren Chernev MAX77826_BUCKBOOST,
85e7314653SIskren Chernev MAX77826_MAX_REGULATORS,
86e7314653SIskren Chernev };
87e7314653SIskren Chernev
88e7314653SIskren Chernev #define MAX77826_MASK_LDO 0x7f
89e7314653SIskren Chernev #define MAX77826_MASK_BUCK 0xff
90e7314653SIskren Chernev #define MAX77826_MASK_BUCKBOOST 0x7f
91e7314653SIskren Chernev #define MAX77826_BUCK_RAMP_DELAY 12500
92e7314653SIskren Chernev
93e7314653SIskren Chernev /* values in mV */
94e7314653SIskren Chernev /* for LDO1-3 */
95e7314653SIskren Chernev #define MAX77826_NMOS_LDO_VOLT_MIN 600000
96e7314653SIskren Chernev #define MAX77826_NMOS_LDO_VOLT_MAX 2187500
97e7314653SIskren Chernev #define MAX77826_NMOS_LDO_VOLT_STEP 12500
98e7314653SIskren Chernev
99e7314653SIskren Chernev /* for LDO4-15 */
100e7314653SIskren Chernev #define MAX77826_PMOS_LDO_VOLT_MIN 800000
101e7314653SIskren Chernev #define MAX77826_PMOS_LDO_VOLT_MAX 3975000
102e7314653SIskren Chernev #define MAX77826_PMOS_LDO_VOLT_STEP 25000
103e7314653SIskren Chernev
104e7314653SIskren Chernev /* for BUCK */
105e7314653SIskren Chernev #define MAX77826_BUCK_VOLT_MIN 500000
106e7314653SIskren Chernev #define MAX77826_BUCK_VOLT_MAX 1800000
107e7314653SIskren Chernev #define MAX77826_BUCK_VOLT_STEP 6250
108e7314653SIskren Chernev
109e7314653SIskren Chernev /* for BUCKBOOST */
110e7314653SIskren Chernev #define MAX77826_BUCKBOOST_VOLT_MIN 2600000
111e7314653SIskren Chernev #define MAX77826_BUCKBOOST_VOLT_MAX 4187500
112e7314653SIskren Chernev #define MAX77826_BUCKBOOST_VOLT_STEP 12500
113e7314653SIskren Chernev #define MAX77826_VOLT_RANGE(_type) \
114e7314653SIskren Chernev ((MAX77826_ ## _type ## _VOLT_MAX - \
115e7314653SIskren Chernev MAX77826_ ## _type ## _VOLT_MIN) / \
116e7314653SIskren Chernev MAX77826_ ## _type ## _VOLT_STEP + 1)
117e7314653SIskren Chernev
118e7314653SIskren Chernev #define MAX77826_LDO(_id, _type) \
119e7314653SIskren Chernev [MAX77826_LDO ## _id] = { \
120e7314653SIskren Chernev .id = MAX77826_LDO ## _id, \
121e7314653SIskren Chernev .name = "LDO"#_id, \
122e7314653SIskren Chernev .of_match = of_match_ptr("LDO"#_id), \
123e7314653SIskren Chernev .regulators_node = "regulators", \
124e7314653SIskren Chernev .ops = &max77826_most_ops, \
125e7314653SIskren Chernev .min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
126e7314653SIskren Chernev .uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
127e7314653SIskren Chernev .n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
128e7314653SIskren Chernev .enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
129e7314653SIskren Chernev .enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
130e7314653SIskren Chernev .vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
131e7314653SIskren Chernev .vsel_mask = MAX77826_MASK_LDO, \
132e7314653SIskren Chernev .owner = THIS_MODULE, \
133e7314653SIskren Chernev }
134e7314653SIskren Chernev
135e7314653SIskren Chernev #define MAX77826_BUCK(_idx, _id, _ops) \
136e7314653SIskren Chernev [MAX77826_ ## _id] = { \
137e7314653SIskren Chernev .id = MAX77826_ ## _id, \
138e7314653SIskren Chernev .name = #_id, \
139e7314653SIskren Chernev .of_match = of_match_ptr(#_id), \
140e7314653SIskren Chernev .regulators_node = "regulators", \
141e7314653SIskren Chernev .ops = &_ops, \
142e7314653SIskren Chernev .min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
143e7314653SIskren Chernev .uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
144e7314653SIskren Chernev .n_voltages = MAX77826_VOLT_RANGE(_id), \
145e7314653SIskren Chernev .enable_reg = MAX77826_REG_B_BB_OPMD, \
146e7314653SIskren Chernev .enable_mask = BIT(_idx * 2 + 1), \
147e7314653SIskren Chernev .vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
148e7314653SIskren Chernev .vsel_mask = MAX77826_MASK_ ## _id, \
149e7314653SIskren Chernev .owner = THIS_MODULE, \
150e7314653SIskren Chernev }
151e7314653SIskren Chernev
152e7314653SIskren Chernev
153e7314653SIskren Chernev
154e7314653SIskren Chernev struct max77826_regulator_info {
155e7314653SIskren Chernev struct regmap *regmap;
156e7314653SIskren Chernev struct regulator_desc *rdesc;
157e7314653SIskren Chernev };
158e7314653SIskren Chernev
159e7314653SIskren Chernev static const struct regmap_config max77826_regmap_config = {
160e7314653SIskren Chernev .reg_bits = 8,
161e7314653SIskren Chernev .val_bits = 8,
162e7314653SIskren Chernev .max_register = MAX77826_REG_DEVICE_ID,
163e7314653SIskren Chernev };
164e7314653SIskren Chernev
165e7314653SIskren Chernev static int max77826_set_voltage_time_sel(struct regulator_dev *,
166e7314653SIskren Chernev unsigned int old_selector,
167e7314653SIskren Chernev unsigned int new_selector);
168e7314653SIskren Chernev
169e7314653SIskren Chernev static const struct regulator_ops max77826_most_ops = {
170e7314653SIskren Chernev .enable = regulator_enable_regmap,
171e7314653SIskren Chernev .disable = regulator_disable_regmap,
172e7314653SIskren Chernev .is_enabled = regulator_is_enabled_regmap,
173e7314653SIskren Chernev .list_voltage = regulator_list_voltage_linear,
174e7314653SIskren Chernev .map_voltage = regulator_map_voltage_linear,
175e7314653SIskren Chernev .get_voltage_sel = regulator_get_voltage_sel_regmap,
176e7314653SIskren Chernev .set_voltage_sel = regulator_set_voltage_sel_regmap,
177e7314653SIskren Chernev };
178e7314653SIskren Chernev
179e7314653SIskren Chernev static const struct regulator_ops max77826_buck_ops = {
180e7314653SIskren Chernev .enable = regulator_enable_regmap,
181e7314653SIskren Chernev .disable = regulator_disable_regmap,
182e7314653SIskren Chernev .is_enabled = regulator_is_enabled_regmap,
183e7314653SIskren Chernev .list_voltage = regulator_list_voltage_linear,
184e7314653SIskren Chernev .map_voltage = regulator_map_voltage_linear,
185e7314653SIskren Chernev .get_voltage_sel = regulator_get_voltage_sel_regmap,
186e7314653SIskren Chernev .set_voltage_sel = regulator_set_voltage_sel_regmap,
187e7314653SIskren Chernev .set_voltage_time_sel = max77826_set_voltage_time_sel,
188e7314653SIskren Chernev };
189e7314653SIskren Chernev
190e7314653SIskren Chernev static struct regulator_desc max77826_regulators_desc[] = {
191e7314653SIskren Chernev MAX77826_LDO(1, NMOS),
192e7314653SIskren Chernev MAX77826_LDO(2, NMOS),
193e7314653SIskren Chernev MAX77826_LDO(3, NMOS),
194e7314653SIskren Chernev MAX77826_LDO(4, PMOS),
195e7314653SIskren Chernev MAX77826_LDO(5, PMOS),
196e7314653SIskren Chernev MAX77826_LDO(6, PMOS),
197e7314653SIskren Chernev MAX77826_LDO(7, PMOS),
198e7314653SIskren Chernev MAX77826_LDO(8, PMOS),
199e7314653SIskren Chernev MAX77826_LDO(9, PMOS),
200e7314653SIskren Chernev MAX77826_LDO(10, PMOS),
201e7314653SIskren Chernev MAX77826_LDO(11, PMOS),
202e7314653SIskren Chernev MAX77826_LDO(12, PMOS),
203e7314653SIskren Chernev MAX77826_LDO(13, PMOS),
204e7314653SIskren Chernev MAX77826_LDO(14, PMOS),
205e7314653SIskren Chernev MAX77826_LDO(15, PMOS),
206e7314653SIskren Chernev MAX77826_BUCK(0, BUCK, max77826_buck_ops),
207e7314653SIskren Chernev MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
208e7314653SIskren Chernev };
209e7314653SIskren Chernev
max77826_set_voltage_time_sel(struct regulator_dev * rdev,unsigned int old_selector,unsigned int new_selector)210e7314653SIskren Chernev static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
211e7314653SIskren Chernev unsigned int old_selector,
212e7314653SIskren Chernev unsigned int new_selector)
213e7314653SIskren Chernev {
214e7314653SIskren Chernev if (new_selector > old_selector) {
215e7314653SIskren Chernev return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
216e7314653SIskren Chernev (new_selector - old_selector),
217e7314653SIskren Chernev MAX77826_BUCK_RAMP_DELAY);
218e7314653SIskren Chernev }
219e7314653SIskren Chernev
220e7314653SIskren Chernev return 0;
221e7314653SIskren Chernev }
222e7314653SIskren Chernev
max77826_read_device_id(struct regmap * regmap,struct device * dev)223e7314653SIskren Chernev static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
224e7314653SIskren Chernev {
225e7314653SIskren Chernev unsigned int device_id;
226e7314653SIskren Chernev int res;
227e7314653SIskren Chernev
228e7314653SIskren Chernev res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
229e7314653SIskren Chernev if (!res)
230e7314653SIskren Chernev dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
231e7314653SIskren Chernev
232e7314653SIskren Chernev return res;
233e7314653SIskren Chernev }
234e7314653SIskren Chernev
max77826_i2c_probe(struct i2c_client * client)235e7314653SIskren Chernev static int max77826_i2c_probe(struct i2c_client *client)
236e7314653SIskren Chernev {
237e7314653SIskren Chernev struct device *dev = &client->dev;
238e7314653SIskren Chernev struct max77826_regulator_info *info;
239e7314653SIskren Chernev struct regulator_config config = {};
240e7314653SIskren Chernev struct regulator_dev *rdev;
241e7314653SIskren Chernev struct regmap *regmap;
242e7314653SIskren Chernev int i;
243e7314653SIskren Chernev
244e7314653SIskren Chernev info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
245e7314653SIskren Chernev GFP_KERNEL);
246e7314653SIskren Chernev if (!info)
247e7314653SIskren Chernev return -ENOMEM;
248e7314653SIskren Chernev
249e7314653SIskren Chernev info->rdesc = max77826_regulators_desc;
250e7314653SIskren Chernev regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
251e7314653SIskren Chernev if (IS_ERR(regmap)) {
252e7314653SIskren Chernev dev_err(dev, "Failed to allocate regmap!\n");
253e7314653SIskren Chernev return PTR_ERR(regmap);
254e7314653SIskren Chernev }
255e7314653SIskren Chernev
256e7314653SIskren Chernev info->regmap = regmap;
257e7314653SIskren Chernev i2c_set_clientdata(client, info);
258e7314653SIskren Chernev
259e7314653SIskren Chernev config.dev = dev;
260e7314653SIskren Chernev config.regmap = regmap;
261e7314653SIskren Chernev config.driver_data = info;
262e7314653SIskren Chernev
263e7314653SIskren Chernev for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
264e7314653SIskren Chernev rdev = devm_regulator_register(dev,
265e7314653SIskren Chernev &max77826_regulators_desc[i],
266e7314653SIskren Chernev &config);
267e7314653SIskren Chernev if (IS_ERR(rdev)) {
268e7314653SIskren Chernev dev_err(dev, "Failed to register regulator!\n");
269e7314653SIskren Chernev return PTR_ERR(rdev);
270e7314653SIskren Chernev }
271e7314653SIskren Chernev }
272e7314653SIskren Chernev
273e7314653SIskren Chernev return max77826_read_device_id(regmap, dev);
274e7314653SIskren Chernev }
275e7314653SIskren Chernev
2767bf0a29cSJisheng Zhang static const struct of_device_id __maybe_unused max77826_of_match[] = {
277e7314653SIskren Chernev { .compatible = "maxim,max77826" },
278e7314653SIskren Chernev { /* sentinel */ }
279e7314653SIskren Chernev };
280e7314653SIskren Chernev MODULE_DEVICE_TABLE(of, max77826_of_match);
281e7314653SIskren Chernev
282e7314653SIskren Chernev static const struct i2c_device_id max77826_id[] = {
283e7314653SIskren Chernev { "max77826-regulator" },
284e7314653SIskren Chernev { /* sentinel */ }
285e7314653SIskren Chernev };
286e7314653SIskren Chernev MODULE_DEVICE_TABLE(i2c, max77826_id);
287e7314653SIskren Chernev
288e7314653SIskren Chernev static struct i2c_driver max77826_regulator_driver = {
289e7314653SIskren Chernev .driver = {
290e7314653SIskren Chernev .name = "max77826",
29167dc71c6SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
292e7314653SIskren Chernev .of_match_table = of_match_ptr(max77826_of_match),
293e7314653SIskren Chernev },
294*964e1865SUwe Kleine-König .probe = max77826_i2c_probe,
295e7314653SIskren Chernev .id_table = max77826_id,
296e7314653SIskren Chernev };
297e7314653SIskren Chernev module_i2c_driver(max77826_regulator_driver);
298e7314653SIskren Chernev
299e7314653SIskren Chernev MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
300e7314653SIskren Chernev MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
301e7314653SIskren Chernev MODULE_LICENSE("GPL");
302