1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/module.h>
  3#include <linux/i2c.h>
  4#include <linux/of.h>
  5#include <linux/regulator/driver.h>
  6#include <linux/regmap.h>
  7
  8static const struct regulator_ops pg86x_ops = {
  9	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 10	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 11	.list_voltage = regulator_list_voltage_linear_range,
 12};
 13
 14static const struct linear_range pg86x_buck1_ranges[] = {
 15	REGULATOR_LINEAR_RANGE(      0,  0, 10,     0),
 16	REGULATOR_LINEAR_RANGE(1000000, 11, 34, 25000),
 17	REGULATOR_LINEAR_RANGE(1600000, 35, 47, 50000),
 18};
 19
 20static const struct linear_range pg86x_buck2_ranges[] = {
 21	REGULATOR_LINEAR_RANGE(      0,  0, 15,     0),
 22	REGULATOR_LINEAR_RANGE(1000000, 16, 39, 25000),
 23	REGULATOR_LINEAR_RANGE(1600000, 40, 52, 50000),
 24};
 25
 26static const struct regulator_desc pg86x_regulators[] = {
 27	{
 28		.id = 0,
 29		.type = REGULATOR_VOLTAGE,
 30		.name = "buck1",
 31		.of_match = of_match_ptr("buck1"),
 32		.n_voltages = 11 + 24 + 13,
 33		.linear_ranges = pg86x_buck1_ranges,
 34		.n_linear_ranges = 3,
 35		.vsel_reg  = 0x24,
 36		.vsel_mask = 0xff,
 37		.ops = &pg86x_ops,
 38		.owner = THIS_MODULE
 39	},
 40	{
 41		.id = 1,
 42		.type = REGULATOR_VOLTAGE,
 43		.name = "buck2",
 44		.of_match = of_match_ptr("buck2"),
 45		.n_voltages = 16 + 24 + 13,
 46		.linear_ranges = pg86x_buck2_ranges,
 47		.n_linear_ranges = 3,
 48		.vsel_reg  = 0x13,
 49		.vsel_mask = 0xff,
 50		.ops = &pg86x_ops,
 51		.owner = THIS_MODULE
 52	},
 53};
 54
 55static const struct regmap_config pg86x_regmap = {
 56	.reg_bits = 8,
 57	.val_bits = 8,
 58};
 59
 60static int pg86x_i2c_probe(struct i2c_client *i2c)
 61{
 62	int id, ret;
 63	struct regulator_config config = {.dev = &i2c->dev};
 64	struct regmap *regmap = devm_regmap_init_i2c(i2c, &pg86x_regmap);
 65
 66	if (IS_ERR(regmap)) {
 67		ret = PTR_ERR(regmap);
 68		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 69		return ret;
 70	}
 71
 72	for (id = 0; id < ARRAY_SIZE(pg86x_regulators); id++) {
 73		struct regulator_dev *rdev;
 74		rdev = devm_regulator_register(&i2c->dev,
 75					       &pg86x_regulators[id],
 76					       &config);
 77		if (IS_ERR(rdev)) {
 78			ret = PTR_ERR(rdev);
 79			dev_err(&i2c->dev, "failed to register %s: %d\n",
 80				pg86x_regulators[id].name, ret);
 81			return ret;
 82		}
 83	}
 84	return 0;
 85}
 86
 87static const struct of_device_id __maybe_unused pg86x_dt_ids[] = {
 88	{ .compatible = "marvell,88pg867" },
 89	{ .compatible = "marvell,88pg868" },
 90	{ }
 91};
 92MODULE_DEVICE_TABLE(of, pg86x_dt_ids);
 93
 94static const struct i2c_device_id pg86x_i2c_id[] = {
 95	{ "88pg867", },
 96	{ "88pg868", },
 97	{ }
 98};
 99MODULE_DEVICE_TABLE(i2c, pg86x_i2c_id);
100
101static struct i2c_driver pg86x_regulator_driver = {
102	.driver = {
103		.name = "88pg86x",
104		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
105		.of_match_table = of_match_ptr(pg86x_dt_ids),
106	},
107	.probe = pg86x_i2c_probe,
108	.id_table = pg86x_i2c_id,
109};
110
111module_i2c_driver(pg86x_regulator_driver);
112
113MODULE_DESCRIPTION("Marvell 88PG86X voltage regulator");
114MODULE_AUTHOR("Alexander Monakov <amonakov@gmail.com>");
115MODULE_LICENSE("GPL");