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+/*
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+ * TI LM363X Regulator Driver
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+ *
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+ * Copyright 2015 Texas Instruments
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+ *
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+ * Author: Milo Kim <milo.kim@ti.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/err.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/ti-lmu.h>
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+#include <linux/mfd/ti-lmu-register.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_gpio.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/regulator/of_regulator.h>
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+#include <linux/slab.h>
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+
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+/* LM3631 */
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+#define LM3631_BOOST_VSEL_MAX 0x25
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+#define LM3631_LDO_VSEL_MAX 0x28
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+#define LM3631_CONT_VSEL_MAX 0x03
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+#define LM3631_VBOOST_MIN 4500000
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+#define LM3631_VCONT_MIN 1800000
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+#define LM3631_VLDO_MIN 4000000
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+#define ENABLE_TIME_USEC 1000
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+
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+/* LM3632 */
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+#define LM3632_BOOST_VSEL_MAX 0x26
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+#define LM3632_LDO_VSEL_MAX 0x29
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+#define LM3632_VBOOST_MIN 4500000
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+#define LM3632_VLDO_MIN 4000000
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+
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+/* Common */
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+#define LM363X_STEP_50mV 50000
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+#define LM363X_STEP_500mV 500000
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+
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+static const int ldo_cont_enable_time[] = {
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+ 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
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+};
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+
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+static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
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+{
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+ enum lm363x_regulator_id id = rdev_get_id(rdev);
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+ u8 val, addr, mask;
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+
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+ switch (id) {
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+ case LM3631_LDO_CONT:
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+ addr = LM3631_REG_ENTIME_VCONT;
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+ mask = LM3631_ENTIME_CONT_MASK;
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+ break;
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+ case LM3631_LDO_OREF:
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+ addr = LM3631_REG_ENTIME_VOREF;
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+ mask = LM3631_ENTIME_MASK;
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+ break;
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+ case LM3631_LDO_POS:
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+ addr = LM3631_REG_ENTIME_VPOS;
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+ mask = LM3631_ENTIME_MASK;
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+ break;
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+ case LM3631_LDO_NEG:
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+ addr = LM3631_REG_ENTIME_VNEG;
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+ mask = LM3631_ENTIME_MASK;
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+ break;
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+ default:
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+ return 0;
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+ }
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+
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+ if (regmap_read(rdev->regmap, addr, (unsigned int *)&val))
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+ return -EINVAL;
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+
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+ val = (val & mask) >> LM3631_ENTIME_SHIFT;
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+
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+ if (id == LM3631_LDO_CONT)
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+ return ldo_cont_enable_time[val];
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+ else
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+ return ENABLE_TIME_USEC * val;
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+}
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+
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+static struct regulator_ops lm363x_boost_voltage_table_ops = {
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+ .list_voltage = regulator_list_voltage_linear,
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+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
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+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
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+};
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+
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+static struct regulator_ops lm363x_regulator_voltage_table_ops = {
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+ .list_voltage = regulator_list_voltage_linear,
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+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
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+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
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+ .enable = regulator_enable_regmap,
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+ .disable = regulator_disable_regmap,
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+ .is_enabled = regulator_is_enabled_regmap,
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+ .enable_time = lm363x_regulator_enable_time,
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+};
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+
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+static const struct regulator_desc lm363x_regulator_desc[] = {
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+ /* LM3631 */
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+ {
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+ .name = "vboost",
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+ .of_match = "vboost",
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+ .id = LM3631_BOOST,
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+ .ops = &lm363x_boost_voltage_table_ops,
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+ .n_voltages = LM3631_BOOST_VSEL_MAX + 1,
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+ .min_uV = LM3631_VBOOST_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3631_REG_VOUT_BOOST,
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+ .vsel_mask = LM3631_VOUT_MASK,
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+ },
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+ {
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+ .name = "ldo_cont",
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+ .of_match = "vcont",
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+ .id = LM3631_LDO_CONT,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3631_CONT_VSEL_MAX + 1,
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+ .min_uV = LM3631_VCONT_MIN,
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+ .uV_step = LM363X_STEP_500mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3631_REG_VOUT_CONT,
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+ .vsel_mask = LM3631_VOUT_CONT_MASK,
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+ .enable_reg = LM3631_REG_LDO_CTRL2,
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+ .enable_mask = LM3631_EN_CONT_MASK,
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+ },
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+ {
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+ .name = "ldo_oref",
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+ .of_match = "voref",
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+ .id = LM3631_LDO_OREF,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
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+ .min_uV = LM3631_VLDO_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3631_REG_VOUT_OREF,
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+ .vsel_mask = LM3631_VOUT_MASK,
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+ .enable_reg = LM3631_REG_LDO_CTRL1,
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+ .enable_mask = LM3631_EN_OREF_MASK,
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+ },
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+ {
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+ .name = "ldo_vpos",
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+ .of_match = "vpos",
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+ .id = LM3631_LDO_POS,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
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+ .min_uV = LM3631_VLDO_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3631_REG_VOUT_POS,
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+ .vsel_mask = LM3631_VOUT_MASK,
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+ .enable_reg = LM3631_REG_LDO_CTRL1,
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+ .enable_mask = LM3631_EN_VPOS_MASK,
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+ },
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+ {
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+ .name = "ldo_vneg",
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+ .of_match = "vneg",
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+ .id = LM3631_LDO_NEG,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
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+ .min_uV = LM3631_VLDO_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3631_REG_VOUT_NEG,
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+ .vsel_mask = LM3631_VOUT_MASK,
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+ .enable_reg = LM3631_REG_LDO_CTRL1,
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+ .enable_mask = LM3631_EN_VNEG_MASK,
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+ },
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+ /* LM3632 */
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+ {
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+ .name = "vboost",
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+ .of_match = "vboost",
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+ .id = LM3632_BOOST,
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+ .ops = &lm363x_boost_voltage_table_ops,
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+ .n_voltages = LM3632_BOOST_VSEL_MAX + 1,
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+ .min_uV = LM3632_VBOOST_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3632_REG_VOUT_BOOST,
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+ .vsel_mask = LM3632_VOUT_MASK,
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+ },
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+ {
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+ .name = "ldo_vpos",
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+ .of_match = "vpos",
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+ .id = LM3632_LDO_POS,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3632_LDO_VSEL_MAX + 1,
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+ .min_uV = LM3632_VLDO_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3632_REG_VOUT_POS,
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+ .vsel_mask = LM3632_VOUT_MASK,
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+ .enable_reg = LM3632_REG_BIAS_CONFIG,
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+ .enable_mask = LM3632_EN_VPOS_MASK,
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+ },
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+ {
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+ .name = "ldo_vneg",
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+ .of_match = "vneg",
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+ .id = LM3632_LDO_NEG,
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+ .ops = &lm363x_regulator_voltage_table_ops,
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+ .n_voltages = LM3632_LDO_VSEL_MAX + 1,
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+ .min_uV = LM3632_VLDO_MIN,
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+ .uV_step = LM363X_STEP_50mV,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+ .vsel_reg = LM3632_REG_VOUT_NEG,
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+ .vsel_mask = LM3632_VOUT_MASK,
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+ .enable_reg = LM3632_REG_BIAS_CONFIG,
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+ .enable_mask = LM3632_EN_VNEG_MASK,
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+ },
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+};
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+
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+static int lm363x_regulator_of_get_enable_gpio(struct device_node *np, int id)
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+{
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+ /*
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+ * Check LCM_EN1/2_GPIO is configured.
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+ * Those pins are used for enabling VPOS/VNEG LDOs.
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+ */
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+ switch (id) {
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+ case LM3632_LDO_POS:
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+ return of_get_named_gpio(np, "ti,lcm-en1-gpio", 0);
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+ case LM3632_LDO_NEG:
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+ return of_get_named_gpio(np, "ti,lcm-en2-gpio", 0);
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+ default:
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+ return -EINVAL;
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+ }
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+}
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+
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+static int lm363x_regulator_probe(struct platform_device *pdev)
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+{
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+ struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
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+ struct regmap *regmap = lmu->regmap;
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+ struct regulator_config cfg = { };
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+ struct regulator_dev *rdev;
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+ struct device *dev = &pdev->dev;
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+ int id = pdev->id;
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+ int ret, ena_gpio;
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+
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+ cfg.dev = dev;
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+ cfg.regmap = regmap;
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+
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+ /*
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+ * LM3632 LDOs can be controlled by external pin.
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+ * Register update is required if the pin is used.
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+ */
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+ ena_gpio = lm363x_regulator_of_get_enable_gpio(dev->of_node, id);
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+ if (gpio_is_valid(ena_gpio)) {
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+ cfg.ena_gpio = ena_gpio;
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+ cfg.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
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+
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+ ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
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+ LM3632_EXT_EN_MASK,
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+ LM3632_EXT_EN_MASK);
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+ if (ret) {
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+ dev_err(dev, "External pin err: %d\n", ret);
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+ return ret;
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+ }
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+ }
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+
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+ rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
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+ if (IS_ERR(rdev)) {
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+ ret = PTR_ERR(rdev);
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+ dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static struct platform_driver lm363x_regulator_driver = {
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+ .probe = lm363x_regulator_probe,
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+ .driver = {
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+ .name = "lm363x-regulator",
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+ },
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+};
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+
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+module_platform_driver(lm363x_regulator_driver);
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+
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+MODULE_DESCRIPTION("TI LM363X Regulator Driver");
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+MODULE_AUTHOR("Milo Kim");
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+MODULE_LICENSE("GPL v2");
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+MODULE_ALIAS("platform:lm363x-regulator");
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Mark Brown