--- /dev/null
+/*
+ * Regulator driver for mp8865
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define MP8865_MAX_VSEL 0x7f
+#define VOL_MIN_IDX 0x00
+#define VOL_MAX_IDX 0x7f
+
+/* Register definitions */
+#define MP8865_VOUT_REG 0
+#define MP8865_SYSCNTL_REG 1
+#define MP8865_ID_REG 2
+#define MP8865_STATUS_REG 3
+
+#define MP8865_VOUT_MASK 0x7f
+#define MP8865_VBOOT_MASK 0x80
+
+#define MP8865_ENABLE 0x80
+#define MP8865_GO_BIT 0x40
+#define MP8865_SLEW_RATE_MASK 0x1c
+#define MP8865_SWITCH_FRE_MASK 0x06
+#define MP8865_PFM_MODE 0X01
+
+/* mp8865 chip information */
+struct mp8865_chip {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+};
+
+struct mp8865_platform_data {
+ struct regulator_init_data *mp8865_init_data;
+ struct device_node *of_node;
+};
+
+static const struct regulator_linear_range mp8865_voltage_ranges[] = {
+ REGULATOR_LINEAR_RANGE(600000, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
+};
+
+static int mp8865_set_voltage(struct regulator_dev *rdev, unsigned sel)
+{
+ int ret;
+
+ ret = regmap_update_bits(rdev->regmap, MP8865_SYSCNTL_REG,
+ MP8865_GO_BIT, MP8865_GO_BIT);
+ if (ret)
+ return ret;
+
+ sel <<= ffs(rdev->desc->vsel_mask) - 1;
+ return regmap_write(rdev->regmap, MP8865_VOUT_REG, sel);
+}
+
+static const struct regmap_config mp8865_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static struct regulator_ops mp8865_dcdc_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = mp8865_set_voltage,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct of_device_id mp8865_of_match[] = {
+ {.compatible = "mps,mp8865", .data = (void *)0},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mp8865_of_match);
+
+static struct of_regulator_match mp8865_matches = {
+ .name = "mp8865_dcdc1",
+ .driver_data = (void *)0,
+};
+
+static struct mp8865_platform_data *
+ mp8865_parse_dt(struct i2c_client *client,
+ struct of_regulator_match **mp8865_reg_matches)
+{
+ struct mp8865_platform_data *pdata;
+ struct device_node *np, *regulators;
+ int ret;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(struct mp8865_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ np = of_node_get(client->dev.of_node);
+ regulators = of_find_node_by_name(np, "regulators");
+ if (!regulators) {
+ dev_err(&client->dev, "regulator node not found\n");
+ return NULL;
+ }
+
+ ret = of_regulator_match(&client->dev, regulators, &mp8865_matches, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "Error parsing regulators init data\n");
+ return NULL;
+ }
+ *mp8865_reg_matches = &mp8865_matches;
+ of_node_put(regulators);
+
+ pdata->mp8865_init_data = mp8865_matches.init_data;
+ pdata->of_node = mp8865_matches.of_node;
+
+ return pdata;
+}
+
+static int mp8865_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct mp8865_chip *mp8865;
+ struct mp8865_platform_data *pdata;
+ struct of_regulator_match *mp8865_reg_matches = NULL;
+ struct regulator_dev *sy_rdev;
+ struct regulator_config config;
+ struct regulator_desc *rdesc;
+
+ mp8865 = devm_kzalloc(&client->dev, sizeof(struct mp8865_chip),
+ GFP_KERNEL);
+ if (!mp8865)
+ return -ENOMEM;
+ pdata = dev_get_platdata(&client->dev);
+ if (!pdata)
+ pdata = mp8865_parse_dt(client, &mp8865_reg_matches);
+
+ if (!pdata || !pdata->mp8865_init_data) {
+ dev_err(&client->dev, "Platform data not found!\n");
+ return -ENODEV;
+ }
+
+ mp8865->dev = &client->dev;
+ mp8865->regmap = devm_regmap_init_i2c(client, &mp8865_regmap_config);
+ if (IS_ERR(mp8865->regmap)) {
+ dev_err(&client->dev, "Failed to allocate regmap!\n");
+ return PTR_ERR(mp8865->regmap);
+ }
+
+ i2c_set_clientdata(client, mp8865);
+
+ config.dev = mp8865->dev;
+ config.driver_data = mp8865;
+ config.init_data = pdata->mp8865_init_data;
+ config.of_node = pdata->of_node;
+ config.regmap = mp8865->regmap;
+
+ rdesc = &mp8865->desc;
+ rdesc->name = "mp8865_dcdc1",
+ rdesc->id = 0,
+ rdesc->ops = &mp8865_dcdc_ops,
+ rdesc->n_voltages = MP8865_MAX_VSEL + 1,
+ rdesc->linear_ranges = mp8865_voltage_ranges,
+ rdesc->n_linear_ranges = ARRAY_SIZE(mp8865_voltage_ranges),
+ rdesc->vsel_reg = MP8865_VOUT_REG;
+ rdesc->vsel_mask = MP8865_VOUT_MASK;
+ rdesc->enable_reg = MP8865_SYSCNTL_REG;
+ rdesc->enable_mask = MP8865_ENABLE;
+ rdesc->type = REGULATOR_VOLTAGE,
+ rdesc->owner = THIS_MODULE;
+
+ sy_rdev = devm_regulator_register(mp8865->dev, &mp8865->desc,
+ &config);
+ if (IS_ERR(sy_rdev)) {
+ dev_err(mp8865->dev, "failed to register regulator\n");
+ return PTR_ERR(sy_rdev);
+ }
+
+ dev_info(mp8865->dev, "mp8865 register successful\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id mp8865_id[] = {
+ { .name = "mps,mp8865", },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mp8865_id);
+
+static struct i2c_driver mp8865_driver = {
+ .driver = {
+ .name = "mp8865",
+ .of_match_table = of_match_ptr(mp8865_of_match),
+ .owner = THIS_MODULE,
+ },
+ .probe = mp8865_probe,
+ .id_table = mp8865_id,
+};
+module_i2c_driver(mp8865_driver);
+
+MODULE_AUTHOR("Zain Wang <zain.wang@rock-chips.com>");
+MODULE_DESCRIPTION("mp8865 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
projects / firefly-linux-kernel-4.4.55.git / commitdiff