1 // SPDX-License-Identifier: GPL-2.0-or-later
3 // max77826-regulator.c - regulator driver for Maxim MAX77826
5 // Author: Iskren Chernev <iskren.chernev@gmail.com>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/err.h>
12 #include <linux/of_device.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/of_regulator.h>
16 #include <linux/i2c.h>
17 #include <linux/regmap.h>
19 enum max77826_registers
{
20 MAX77826_REG_INT_SRC
= 0x00,
25 MAX77826_REG_INT_SRC_M
,
26 MAX77826_REG_TOPSYS_INT_M
,
29 MAX77826_REG_BB_INT_M
,
30 MAX77826_REG_TOPSYS_STAT
,
34 /* 0x0E - 0x0F: Reserved */
35 MAX77826_REG_LDO_OPMD1
= 0x10,
36 MAX77826_REG_LDO_OPMD2
,
37 MAX77826_REG_LDO_OPMD3
,
38 MAX77826_REG_LDO_OPMD4
,
39 MAX77826_REG_B_BB_OPMD
,
40 /* 0x15 - 0x1F: Reserved */
41 MAX77826_REG_LDO1_CFG
= 0x20,
42 MAX77826_REG_LDO2_CFG
,
43 MAX77826_REG_LDO3_CFG
,
44 MAX77826_REG_LDO4_CFG
,
45 MAX77826_REG_LDO5_CFG
,
46 MAX77826_REG_LDO6_CFG
,
47 MAX77826_REG_LDO7_CFG
,
48 MAX77826_REG_LDO8_CFG
,
49 MAX77826_REG_LDO9_CFG
,
50 MAX77826_REG_LDO10_CFG
,
51 MAX77826_REG_LDO11_CFG
,
52 MAX77826_REG_LDO12_CFG
,
53 MAX77826_REG_LDO13_CFG
,
54 MAX77826_REG_LDO14_CFG
,
55 MAX77826_REG_LDO15_CFG
,
57 MAX77826_REG_BUCK_CFG
= 0x30,
58 MAX77826_REG_BUCK_VOUT
,
61 /* 0x34 - 0x3F: Reserved */
62 MAX77826_REG_BUCK_SS_FREQ
= 0x40,
63 MAX77826_REG_UVLO_FALL
,
64 /* 0x42 - 0xCE: Reserved */
65 MAX77826_REG_DEVICE_ID
= 0xCF,
68 enum max77826_regulators
{
86 MAX77826_MAX_REGULATORS
,
89 #define MAX77826_MASK_LDO 0x7f
90 #define MAX77826_MASK_BUCK 0xff
91 #define MAX77826_MASK_BUCKBOOST 0x7f
92 #define MAX77826_BUCK_RAMP_DELAY 12500
96 #define MAX77826_NMOS_LDO_VOLT_MIN 600000
97 #define MAX77826_NMOS_LDO_VOLT_MAX 2187500
98 #define MAX77826_NMOS_LDO_VOLT_STEP 12500
101 #define MAX77826_PMOS_LDO_VOLT_MIN 800000
102 #define MAX77826_PMOS_LDO_VOLT_MAX 3975000
103 #define MAX77826_PMOS_LDO_VOLT_STEP 25000
106 #define MAX77826_BUCK_VOLT_MIN 500000
107 #define MAX77826_BUCK_VOLT_MAX 1800000
108 #define MAX77826_BUCK_VOLT_STEP 6250
111 #define MAX77826_BUCKBOOST_VOLT_MIN 2600000
112 #define MAX77826_BUCKBOOST_VOLT_MAX 4187500
113 #define MAX77826_BUCKBOOST_VOLT_STEP 12500
114 #define MAX77826_VOLT_RANGE(_type) \
115 ((MAX77826_ ## _type ## _VOLT_MAX - \
116 MAX77826_ ## _type ## _VOLT_MIN) / \
117 MAX77826_ ## _type ## _VOLT_STEP + 1)
119 #define MAX77826_LDO(_id, _type) \
120 [MAX77826_LDO ## _id] = { \
121 .id = MAX77826_LDO ## _id, \
123 .of_match = of_match_ptr("LDO"#_id), \
124 .regulators_node = "regulators", \
125 .ops = &max77826_most_ops, \
126 .min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
127 .uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
128 .n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
129 .enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
130 .enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
131 .vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
132 .vsel_mask = MAX77826_MASK_LDO, \
133 .owner = THIS_MODULE, \
136 #define MAX77826_BUCK(_idx, _id, _ops) \
137 [MAX77826_ ## _id] = { \
138 .id = MAX77826_ ## _id, \
140 .of_match = of_match_ptr(#_id), \
141 .regulators_node = "regulators", \
143 .min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
144 .uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
145 .n_voltages = MAX77826_VOLT_RANGE(_id), \
146 .enable_reg = MAX77826_REG_B_BB_OPMD, \
147 .enable_mask = BIT(_idx * 2 + 1), \
148 .vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
149 .vsel_mask = MAX77826_MASK_ ## _id, \
150 .owner = THIS_MODULE, \
155 struct max77826_regulator_info
{
156 struct regmap
*regmap
;
157 struct regulator_desc
*rdesc
;
160 static const struct regmap_config max77826_regmap_config
= {
163 .max_register
= MAX77826_REG_DEVICE_ID
,
166 static int max77826_set_voltage_time_sel(struct regulator_dev
*,
167 unsigned int old_selector
,
168 unsigned int new_selector
);
170 static const struct regulator_ops max77826_most_ops
= {
171 .enable
= regulator_enable_regmap
,
172 .disable
= regulator_disable_regmap
,
173 .is_enabled
= regulator_is_enabled_regmap
,
174 .list_voltage
= regulator_list_voltage_linear
,
175 .map_voltage
= regulator_map_voltage_linear
,
176 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
177 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
180 static const struct regulator_ops max77826_buck_ops
= {
181 .enable
= regulator_enable_regmap
,
182 .disable
= regulator_disable_regmap
,
183 .is_enabled
= regulator_is_enabled_regmap
,
184 .list_voltage
= regulator_list_voltage_linear
,
185 .map_voltage
= regulator_map_voltage_linear
,
186 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
187 .set_voltage_sel
= regulator_set_voltage_sel_regmap
,
188 .set_voltage_time_sel
= max77826_set_voltage_time_sel
,
191 static struct regulator_desc max77826_regulators_desc
[] = {
192 MAX77826_LDO(1, NMOS
),
193 MAX77826_LDO(2, NMOS
),
194 MAX77826_LDO(3, NMOS
),
195 MAX77826_LDO(4, PMOS
),
196 MAX77826_LDO(5, PMOS
),
197 MAX77826_LDO(6, PMOS
),
198 MAX77826_LDO(7, PMOS
),
199 MAX77826_LDO(8, PMOS
),
200 MAX77826_LDO(9, PMOS
),
201 MAX77826_LDO(10, PMOS
),
202 MAX77826_LDO(11, PMOS
),
203 MAX77826_LDO(12, PMOS
),
204 MAX77826_LDO(13, PMOS
),
205 MAX77826_LDO(14, PMOS
),
206 MAX77826_LDO(15, PMOS
),
207 MAX77826_BUCK(0, BUCK
, max77826_buck_ops
),
208 MAX77826_BUCK(1, BUCKBOOST
, max77826_most_ops
),
211 static int max77826_set_voltage_time_sel(struct regulator_dev
*rdev
,
212 unsigned int old_selector
,
213 unsigned int new_selector
)
215 if (new_selector
> old_selector
) {
216 return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP
*
217 (new_selector
- old_selector
),
218 MAX77826_BUCK_RAMP_DELAY
);
224 static int max77826_read_device_id(struct regmap
*regmap
, struct device
*dev
)
226 unsigned int device_id
;
229 res
= regmap_read(regmap
, MAX77826_REG_DEVICE_ID
, &device_id
);
231 dev_dbg(dev
, "DEVICE_ID: 0x%x\n", device_id
);
236 static int max77826_i2c_probe(struct i2c_client
*client
)
238 struct device
*dev
= &client
->dev
;
239 struct max77826_regulator_info
*info
;
240 struct regulator_config config
= {};
241 struct regulator_dev
*rdev
;
242 struct regmap
*regmap
;
245 info
= devm_kzalloc(dev
, sizeof(struct max77826_regulator_info
),
250 info
->rdesc
= max77826_regulators_desc
;
251 regmap
= devm_regmap_init_i2c(client
, &max77826_regmap_config
);
252 if (IS_ERR(regmap
)) {
253 dev_err(dev
, "Failed to allocate regmap!\n");
254 return PTR_ERR(regmap
);
257 info
->regmap
= regmap
;
258 i2c_set_clientdata(client
, info
);
261 config
.regmap
= regmap
;
262 config
.driver_data
= info
;
264 for (i
= 0; i
< MAX77826_MAX_REGULATORS
; i
++) {
265 rdev
= devm_regulator_register(dev
,
266 &max77826_regulators_desc
[i
],
269 dev_err(dev
, "Failed to register regulator!\n");
270 return PTR_ERR(rdev
);
274 return max77826_read_device_id(regmap
, dev
);
277 static const struct of_device_id __maybe_unused max77826_of_match
[] = {
278 { .compatible
= "maxim,max77826" },
281 MODULE_DEVICE_TABLE(of
, max77826_of_match
);
283 static const struct i2c_device_id max77826_id
[] = {
284 { "max77826-regulator" },
287 MODULE_DEVICE_TABLE(i2c
, max77826_id
);
289 static struct i2c_driver max77826_regulator_driver
= {
292 .of_match_table
= of_match_ptr(max77826_of_match
),
294 .probe_new
= max77826_i2c_probe
,
295 .id_table
= max77826_id
,
297 module_i2c_driver(max77826_regulator_driver
);
299 MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
300 MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
301 MODULE_LICENSE("GPL");