regulator: mt6311: Add support for mt6311 regulator
Add regulator support for mt6311.
It has 2 regulaotrs - Buck and LDO, provide the related buck/ldo voltage
data to the driver, and creates the regulator_desc table. Supported
operations for Buck are enabled/disabled and voltage change, only
enabled/disabled for LDO.
Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/mt6311-regulator.c b/drivers/regulator/mt6311-regulator.c
new file mode 100644
index 0000000..096e620
--- /dev/null
+++ b/drivers/regulator/mt6311-regulator.c
@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Henry Chen <henryc.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/mt6311.h>
+#include <linux/slab.h>
+#include "mt6311-regulator.h"
+
+static const struct regmap_config mt6311_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = MT6311_FQMTR_CON4,
+};
+
+/* Default limits measured in millivolts and milliamps */
+#define MT6311_MIN_UV 600000
+#define MT6311_MAX_UV 1400000
+#define MT6311_STEP_UV 6250
+
+static const struct regulator_linear_range buck_volt_range[] = {
+ REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV),
+};
+
+static struct regulator_ops mt6311_buck_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static struct regulator_ops mt6311_ldo_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+#define MT6311_BUCK(_id) \
+{\
+ .name = #_id,\
+ .ops = &mt6311_buck_ops,\
+ .of_match = of_match_ptr(#_id),\
+ .regulators_node = of_match_ptr("regulators"),\
+ .type = REGULATOR_VOLTAGE,\
+ .id = MT6311_ID_##_id,\
+ .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
+ .min_uV = MT6311_MIN_UV,\
+ .uV_step = MT6311_STEP_UV,\
+ .owner = THIS_MODULE,\
+ .linear_ranges = buck_volt_range, \
+ .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \
+ .enable_reg = MT6311_VDVFS11_CON9,\
+ .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
+ .vsel_reg = MT6311_VDVFS11_CON12,\
+ .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
+}
+
+#define MT6311_LDO(_id) \
+{\
+ .name = #_id,\
+ .ops = &mt6311_ldo_ops,\
+ .of_match = of_match_ptr(#_id),\
+ .regulators_node = of_match_ptr("regulators"),\
+ .type = REGULATOR_VOLTAGE,\
+ .id = MT6311_ID_##_id,\
+ .owner = THIS_MODULE,\
+ .enable_reg = MT6311_LDO_CON3,\
+ .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
+}
+
+static struct regulator_desc mt6311_regulators[] = {
+ MT6311_BUCK(VDVFS),
+ MT6311_LDO(VBIASN),
+};
+
+/*
+ * I2C driver interface functions
+ */
+static int mt6311_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+ int error, i, ret;
+ unsigned int data;
+
+ regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
+ if (IS_ERR(regmap)) {
+ error = PTR_ERR(regmap);
+ dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
+ error);
+ return error;
+ }
+
+ ret = regmap_read(regmap, MT6311_SWCID, &data);
+ if (ret < 0) {
+ dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
+ return ret;
+ }
+
+ switch (data) {
+ case MT6311_E1_CID_CODE:
+ case MT6311_E2_CID_CODE:
+ case MT6311_E3_CID_CODE:
+ break;
+ default:
+ dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
+ return -ENODEV;
+ }
+
+ for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
+ config.dev = &i2c->dev;
+ config.regmap = regmap;
+
+ rdev = devm_regulator_register(&i2c->dev,
+ &mt6311_regulators[i], &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev,
+ "Failed to register MT6311 regulator\n");
+ return PTR_ERR(rdev);
+ }
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id mt6311_i2c_id[] = {
+ {"mt6311", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id mt6311_dt_ids[] = {
+ { .compatible = "mediatek,mt6311-regulator",
+ .data = &mt6311_i2c_id[0] },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
+#endif
+
+static struct i2c_driver mt6311_regulator_driver = {
+ .driver = {
+ .name = "mt6311",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(mt6311_dt_ids),
+ },
+ .probe = mt6311_i2c_probe,
+ .id_table = mt6311_i2c_id,
+};
+
+module_i2c_driver(mt6311_regulator_driver);
+
+MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
+MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
+MODULE_LICENSE("GPL v2");