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@@ -0,0 +1,167 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+//
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+// sy8106a-regulator.c - Regulator device driver for SY8106A
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+//
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+// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>
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+// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>
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+
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+#include <linux/err.h>
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+#include <linux/i2c.h>
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+#include <linux/module.h>
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+#include <linux/regmap.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/regulator/of_regulator.h>
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+
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+#define SY8106A_REG_VOUT1_SEL 0x01
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+#define SY8106A_REG_VOUT_COM 0x02
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+#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
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+#define SY8106A_DISABLE_REG BIT(0)
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+/*
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+ * The I2C controlled voltage will only work when this bit is set; otherwise
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+ * it will behave like a fixed regulator.
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+ */
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+#define SY8106A_GO_BIT BIT(7)
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+
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+struct sy8106a {
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+ struct regulator_dev *rdev;
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+ struct regmap *regmap;
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+ u32 fixed_voltage;
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+};
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+
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+static const struct regmap_config sy8106a_regmap_config = {
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+ .reg_bits = 8,
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+ .val_bits = 8,
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+};
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+
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+static const struct regulator_ops sy8106a_ops = {
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+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
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+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
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+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
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+ .list_voltage = regulator_list_voltage_linear,
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+ /* Enabling/disabling the regulator is not yet implemented */
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+};
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+
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+/* Default limits measured in millivolts */
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+#define SY8106A_MIN_MV 680
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+#define SY8106A_MAX_MV 1950
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+#define SY8106A_STEP_MV 10
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+
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+static const struct regulator_desc sy8106a_reg = {
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+ .name = "SY8106A",
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+ .id = 0,
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+ .ops = &sy8106a_ops,
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+ .type = REGULATOR_VOLTAGE,
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+ .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
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+ .min_uV = (SY8106A_MIN_MV * 1000),
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+ .uV_step = (SY8106A_STEP_MV * 1000),
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+ .vsel_reg = SY8106A_REG_VOUT1_SEL,
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+ .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
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+ /*
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+ * This ramp_delay is a conservative default value which works on
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+ * H3/H5 boards VDD-CPUX situations.
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+ */
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+ .ramp_delay = 200,
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+ .owner = THIS_MODULE,
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+};
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+
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+/*
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+ * I2C driver interface functions
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+ */
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+static int sy8106a_i2c_probe(struct i2c_client *i2c,
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+ const struct i2c_device_id *id)
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+{
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+ struct sy8106a *chip;
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+ struct device *dev = &i2c->dev;
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+ struct regulator_dev *rdev = NULL;
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+ struct regulator_config config = { };
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+ unsigned int reg, vsel;
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+ int error;
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+
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+ chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL);
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+ if (!chip)
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+ return -ENOMEM;
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+
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+ error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",
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+ &chip->fixed_voltage);
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+ if (error)
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+ return error;
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+
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+ if (chip->fixed_voltage < SY8106A_MIN_MV * 1000 ||
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+ chip->fixed_voltage > SY8106A_MAX_MV * 1000)
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+ return -EINVAL;
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+
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+ chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
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+ if (IS_ERR(chip->regmap)) {
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+ error = PTR_ERR(chip->regmap);
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+ dev_err(dev, "Failed to allocate register map: %d\n", error);
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+ return error;
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+ }
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+
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+ config.dev = &i2c->dev;
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+ config.regmap = chip->regmap;
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+ config.driver_data = chip;
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+
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+ config.of_node = dev->of_node;
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+ config.init_data = of_get_regulator_init_data(dev, dev->of_node,
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+ &sy8106a_reg);
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+
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+ if (!config.init_data)
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+ return -ENOMEM;
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+
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+ /* Ensure GO_BIT is enabled when probing */
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+ error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, ®);
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+ if (error)
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+ return error;
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+
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+ if (!(reg & SY8106A_GO_BIT)) {
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+ vsel = (chip->fixed_voltage / 1000 - SY8106A_MIN_MV) /
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+ SY8106A_STEP_MV;
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+
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+ error = regmap_write(chip->regmap, SY8106A_REG_VOUT1_SEL,
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+ vsel | SY8106A_GO_BIT);
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+ if (error)
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+ return error;
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+ }
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+
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+ /* Probe regulator */
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+ rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
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+ if (IS_ERR(rdev)) {
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+ error = PTR_ERR(rdev);
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+ dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);
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+ return error;
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+ }
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+
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+ chip->rdev = rdev;
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+
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+ i2c_set_clientdata(i2c, chip);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id sy8106a_i2c_of_match[] = {
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+ { .compatible = "silergy,sy8106a" },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);
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+
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+static const struct i2c_device_id sy8106a_i2c_id[] = {
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+ { "sy8106a", 0 },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
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+
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+static struct i2c_driver sy8106a_regulator_driver = {
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+ .driver = {
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+ .name = "sy8106a",
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+ .of_match_table = of_match_ptr(sy8106a_i2c_of_match),
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+ },
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+ .probe = sy8106a_i2c_probe,
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+ .id_table = sy8106a_i2c_id,
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+};
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+
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+module_i2c_driver(sy8106a_regulator_driver);
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+
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+MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");
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+MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
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+MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
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+MODULE_LICENSE("GPL");
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Ondrej Jirman