regulator: 88pg86x: new i2c dual regulator chip

This chip is found on Google Chromecast and Valve Steam Link devices.
It provides two DC regulators with I2C voltage control, separate GPIO
enable pins and one sleep mode pin.

This driver does not expose GPIO functionality, but supports voltage
control in 1.0-2.2V range, based on I2C register information given in
Chromecast kernel driver by Jisheng Zhang.

Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Alexander Monakov <amonakov@ispras.ru>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/regulator/88pg86x.c b/drivers/regulator/88pg86x.c
new file mode 100644
index 000000000000..d5ef55c81185
--- /dev/null
+++ b/drivers/regulator/88pg86x.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/regulator/driver.h>
+#include <linux/regmap.h>
+
+static const struct regulator_ops pg86x_ops = {
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.list_voltage = regulator_list_voltage_linear_range,
+};
+
+static const struct regulator_linear_range pg86x_buck1_ranges[] = {
+	REGULATOR_LINEAR_RANGE(      0,  0, 10,     0),
+	REGULATOR_LINEAR_RANGE(1000000, 11, 34, 25000),
+	REGULATOR_LINEAR_RANGE(1600000, 35, 47, 50000),
+};
+
+static const struct regulator_linear_range pg86x_buck2_ranges[] = {
+	REGULATOR_LINEAR_RANGE(      0,  0, 15,     0),
+	REGULATOR_LINEAR_RANGE(1000000, 16, 39, 25000),
+	REGULATOR_LINEAR_RANGE(1600000, 40, 52, 50000),
+};
+
+static const struct regulator_desc pg86x_regulators[] = {
+	{
+		.id = 0,
+		.type = REGULATOR_VOLTAGE,
+		.name = "buck1",
+		.of_match = of_match_ptr("buck1"),
+		.n_voltages = 11 + 24 + 13,
+		.linear_ranges = pg86x_buck1_ranges,
+		.n_linear_ranges = 3,
+		.vsel_reg  = 0x24,
+		.vsel_mask = 0xff,
+		.ops = &pg86x_ops,
+		.owner = THIS_MODULE
+	},
+	{
+		.id = 1,
+		.type = REGULATOR_VOLTAGE,
+		.name = "buck2",
+		.of_match = of_match_ptr("buck2"),
+		.n_voltages = 16 + 24 + 13,
+		.linear_ranges = pg86x_buck2_ranges,
+		.n_linear_ranges = 3,
+		.vsel_reg  = 0x13,
+		.vsel_mask = 0xff,
+		.ops = &pg86x_ops,
+		.owner = THIS_MODULE
+	},
+};
+
+static const struct regmap_config pg86x_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int pg86x_i2c_probe(struct i2c_client *i2c)
+{
+	int id, ret;
+	struct regulator_config config = {.dev = &i2c->dev};
+	struct regmap *regmap = devm_regmap_init_i2c(i2c, &pg86x_regmap);
+
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+		return ret;
+	}
+
+	for (id = 0; id < ARRAY_SIZE(pg86x_regulators); id++) {
+		struct regulator_dev *rdev;
+		rdev = devm_regulator_register(&i2c->dev,
+					       &pg86x_regulators[id],
+					       &config);
+		if (IS_ERR(rdev)) {
+			ret = PTR_ERR(rdev);
+			dev_err(&i2c->dev, "failed to register %s: %d\n",
+				pg86x_regulators[id].name, ret);
+			return ret;
+		}
+	}
+	return 0;
+}
+
+static const struct of_device_id pg86x_dt_ids [] = {
+	{ .compatible = "marvell,88pg867" },
+	{ .compatible = "marvell,88pg868" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pg86x_dt_ids);
+
+static const struct i2c_device_id pg86x_i2c_id[] = {
+	{ "88pg867", },
+	{ "88pg868", },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pg86x_i2c_id);
+
+static struct i2c_driver pg86x_regulator_driver = {
+	.driver = {
+		.name = "88pg86x",
+		.of_match_table = of_match_ptr(pg86x_dt_ids),
+	},
+	.probe_new = pg86x_i2c_probe,
+	.id_table = pg86x_i2c_id,
+};
+
+module_i2c_driver(pg86x_regulator_driver);
+
+MODULE_DESCRIPTION("Marvell 88PG86X voltage regulator");
+MODULE_AUTHOR("Alexander Monakov <amonakov@gmail.com>");
+MODULE_LICENSE("GPL");