14444a1c1SMarkus Reichl // SPDX-License-Identifier: GPL-2.0
24444a1c1SMarkus Reichl //
34444a1c1SMarkus Reichl // Copyright (c) 2019 five technologies GmbH
44444a1c1SMarkus Reichl // Author: Markus Reichl <m.reichl@fivetechno.de>
54444a1c1SMarkus Reichl
64444a1c1SMarkus Reichl #include <linux/module.h>
74444a1c1SMarkus Reichl #include <linux/i2c.h>
84444a1c1SMarkus Reichl #include <linux/of.h>
94444a1c1SMarkus Reichl #include <linux/regulator/driver.h>
104444a1c1SMarkus Reichl #include <linux/regmap.h>
114444a1c1SMarkus Reichl
124444a1c1SMarkus Reichl
134444a1c1SMarkus Reichl #define VOL_MIN_IDX 0x00
144444a1c1SMarkus Reichl #define VOL_MAX_IDX 0x7ff
154444a1c1SMarkus Reichl
164444a1c1SMarkus Reichl /* Register definitions */
174444a1c1SMarkus Reichl #define MP8859_VOUT_L_REG 0 //3 lo Bits
184444a1c1SMarkus Reichl #define MP8859_VOUT_H_REG 1 //8 hi Bits
194444a1c1SMarkus Reichl #define MP8859_VOUT_GO_REG 2
204444a1c1SMarkus Reichl #define MP8859_IOUT_LIM_REG 3
214444a1c1SMarkus Reichl #define MP8859_CTL1_REG 4
224444a1c1SMarkus Reichl #define MP8859_CTL2_REG 5
234444a1c1SMarkus Reichl #define MP8859_RESERVED1_REG 6
244444a1c1SMarkus Reichl #define MP8859_RESERVED2_REG 7
254444a1c1SMarkus Reichl #define MP8859_RESERVED3_REG 8
264444a1c1SMarkus Reichl #define MP8859_STATUS_REG 9
274444a1c1SMarkus Reichl #define MP8859_INTERRUPT_REG 0x0A
284444a1c1SMarkus Reichl #define MP8859_MASK_REG 0x0B
294444a1c1SMarkus Reichl #define MP8859_ID1_REG 0x0C
304444a1c1SMarkus Reichl #define MP8859_MFR_ID_REG 0x27
314444a1c1SMarkus Reichl #define MP8859_DEV_ID_REG 0x28
324444a1c1SMarkus Reichl #define MP8859_IC_REV_REG 0x29
334444a1c1SMarkus Reichl
344444a1c1SMarkus Reichl #define MP8859_MAX_REG 0x29
354444a1c1SMarkus Reichl
364444a1c1SMarkus Reichl #define MP8859_GO_BIT 0x01
374444a1c1SMarkus Reichl
384444a1c1SMarkus Reichl
mp8859_set_voltage_sel(struct regulator_dev * rdev,unsigned int sel)394444a1c1SMarkus Reichl static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
404444a1c1SMarkus Reichl {
414444a1c1SMarkus Reichl int ret;
424444a1c1SMarkus Reichl
434444a1c1SMarkus Reichl ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7);
444444a1c1SMarkus Reichl
454444a1c1SMarkus Reichl if (ret)
464444a1c1SMarkus Reichl return ret;
474444a1c1SMarkus Reichl ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3);
484444a1c1SMarkus Reichl
494444a1c1SMarkus Reichl if (ret)
504444a1c1SMarkus Reichl return ret;
514444a1c1SMarkus Reichl ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG,
524444a1c1SMarkus Reichl MP8859_GO_BIT, 1);
534444a1c1SMarkus Reichl return ret;
544444a1c1SMarkus Reichl }
554444a1c1SMarkus Reichl
mp8859_get_voltage_sel(struct regulator_dev * rdev)564444a1c1SMarkus Reichl static int mp8859_get_voltage_sel(struct regulator_dev *rdev)
574444a1c1SMarkus Reichl {
584444a1c1SMarkus Reichl unsigned int val_tmp;
594444a1c1SMarkus Reichl unsigned int val;
604444a1c1SMarkus Reichl int ret;
614444a1c1SMarkus Reichl
624444a1c1SMarkus Reichl ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp);
634444a1c1SMarkus Reichl
644444a1c1SMarkus Reichl if (ret)
654444a1c1SMarkus Reichl return ret;
664444a1c1SMarkus Reichl val = val_tmp << 3;
674444a1c1SMarkus Reichl
684444a1c1SMarkus Reichl ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp);
694444a1c1SMarkus Reichl
704444a1c1SMarkus Reichl if (ret)
714444a1c1SMarkus Reichl return ret;
724444a1c1SMarkus Reichl val |= val_tmp & 0x07;
734444a1c1SMarkus Reichl return val;
744444a1c1SMarkus Reichl }
754444a1c1SMarkus Reichl
7660ab7f41SMatti Vaittinen static const struct linear_range mp8859_dcdc_ranges[] = {
774444a1c1SMarkus Reichl REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
784444a1c1SMarkus Reichl };
794444a1c1SMarkus Reichl
804444a1c1SMarkus Reichl static const struct regmap_config mp8859_regmap = {
814444a1c1SMarkus Reichl .reg_bits = 8,
824444a1c1SMarkus Reichl .val_bits = 8,
834444a1c1SMarkus Reichl .max_register = MP8859_MAX_REG,
844444a1c1SMarkus Reichl .cache_type = REGCACHE_RBTREE,
854444a1c1SMarkus Reichl };
864444a1c1SMarkus Reichl
874444a1c1SMarkus Reichl static const struct regulator_ops mp8859_ops = {
884444a1c1SMarkus Reichl .set_voltage_sel = mp8859_set_voltage_sel,
894444a1c1SMarkus Reichl .get_voltage_sel = mp8859_get_voltage_sel,
904444a1c1SMarkus Reichl .list_voltage = regulator_list_voltage_linear_range,
914444a1c1SMarkus Reichl };
924444a1c1SMarkus Reichl
934444a1c1SMarkus Reichl static const struct regulator_desc mp8859_regulators[] = {
944444a1c1SMarkus Reichl {
954444a1c1SMarkus Reichl .id = 0,
964444a1c1SMarkus Reichl .type = REGULATOR_VOLTAGE,
974444a1c1SMarkus Reichl .name = "mp8859_dcdc",
984d49177fSMarkus Reichl .supply_name = "vin",
994444a1c1SMarkus Reichl .of_match = of_match_ptr("mp8859_dcdc"),
1004444a1c1SMarkus Reichl .n_voltages = VOL_MAX_IDX + 1,
1014444a1c1SMarkus Reichl .linear_ranges = mp8859_dcdc_ranges,
1024444a1c1SMarkus Reichl .n_linear_ranges = 1,
1034444a1c1SMarkus Reichl .ops = &mp8859_ops,
1044444a1c1SMarkus Reichl .owner = THIS_MODULE,
1054444a1c1SMarkus Reichl },
1064444a1c1SMarkus Reichl };
1074444a1c1SMarkus Reichl
mp8859_i2c_probe(struct i2c_client * i2c)1084444a1c1SMarkus Reichl static int mp8859_i2c_probe(struct i2c_client *i2c)
1094444a1c1SMarkus Reichl {
1104444a1c1SMarkus Reichl int ret;
1114444a1c1SMarkus Reichl struct regulator_config config = {.dev = &i2c->dev};
1124444a1c1SMarkus Reichl struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap);
1134444a1c1SMarkus Reichl struct regulator_dev *rdev;
1144444a1c1SMarkus Reichl
1154444a1c1SMarkus Reichl if (IS_ERR(regmap)) {
1164444a1c1SMarkus Reichl ret = PTR_ERR(regmap);
1174444a1c1SMarkus Reichl dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
1184444a1c1SMarkus Reichl return ret;
1194444a1c1SMarkus Reichl }
1204444a1c1SMarkus Reichl rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0],
1214444a1c1SMarkus Reichl &config);
1224444a1c1SMarkus Reichl
1234444a1c1SMarkus Reichl if (IS_ERR(rdev)) {
1244444a1c1SMarkus Reichl ret = PTR_ERR(rdev);
1254444a1c1SMarkus Reichl dev_err(&i2c->dev, "failed to register %s: %d\n",
1264444a1c1SMarkus Reichl mp8859_regulators[0].name, ret);
1274444a1c1SMarkus Reichl return ret;
1284444a1c1SMarkus Reichl }
1294444a1c1SMarkus Reichl return 0;
1304444a1c1SMarkus Reichl }
1314444a1c1SMarkus Reichl
132334e6b85SKrzysztof Kozlowski static const struct of_device_id mp8859_dt_id[] __maybe_unused = {
1334444a1c1SMarkus Reichl {.compatible = "mps,mp8859"},
1344444a1c1SMarkus Reichl {},
1354444a1c1SMarkus Reichl };
1364444a1c1SMarkus Reichl MODULE_DEVICE_TABLE(of, mp8859_dt_id);
1374444a1c1SMarkus Reichl
1384444a1c1SMarkus Reichl static const struct i2c_device_id mp8859_i2c_id[] = {
1394444a1c1SMarkus Reichl { "mp8859", },
1404444a1c1SMarkus Reichl { },
1414444a1c1SMarkus Reichl };
1424444a1c1SMarkus Reichl MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
1434444a1c1SMarkus Reichl
1444444a1c1SMarkus Reichl static struct i2c_driver mp8859_regulator_driver = {
1454444a1c1SMarkus Reichl .driver = {
1464444a1c1SMarkus Reichl .name = "mp8859",
14767dc71c6SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1484444a1c1SMarkus Reichl .of_match_table = of_match_ptr(mp8859_dt_id),
1494444a1c1SMarkus Reichl },
150*964e1865SUwe Kleine-König .probe = mp8859_i2c_probe,
1514444a1c1SMarkus Reichl .id_table = mp8859_i2c_id,
1524444a1c1SMarkus Reichl };
1534444a1c1SMarkus Reichl
1544444a1c1SMarkus Reichl module_i2c_driver(mp8859_regulator_driver);
1554444a1c1SMarkus Reichl
1564444a1c1SMarkus Reichl MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
1574444a1c1SMarkus Reichl MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
1584444a1c1SMarkus Reichl MODULE_LICENSE("GPL v2");
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