regulator: tps65218: Add Regulator driver for TPS65218 PMIC

This patch adds support for TPS65218 PMIC regulators.

The regulators set consists of 6 DCDCs and 1 LDO. The output
voltages are configurable and are meant to supply power to the
main processor and other components.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 314 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6a7932822e37..b05da8803bd1 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -513,6 +513,15 @@ config REGULATOR_TPS65217
           voltage regulators. It supports software based voltage control
           for different voltage domains
 
+config REGULATOR_TPS65218
+        tristate "TI TPS65218 Power regulators"
+        depends on MFD_TPS65218
+        help
+          This driver supports TPS65218 voltage regulator chips. TPS65218
+          provides six step-down converters and one general-purpose LDO
+          voltage regulators. It supports software based voltage control
+          for different voltage domains
+
 config REGULATOR_TPS6524X
         tristate "TI TPS6524X Power regulators"
         depends on SPI
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 979f9ddcf259..ba801a5081b6 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65090) += tps65090-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65217) += tps65217-regulator.o
+obj-$(CONFIG_REGULATOR_TPS65218) += tps65218-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6524X) += tps6524x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
diff --git a/drivers/regulator/tps65218-regulator.c b/drivers/regulator/tps65218-regulator.c
new file mode 100644
index 000000000000..958276c891a4
--- /dev/null
+++ b/drivers/regulator/tps65218-regulator.c
@@ -0,0 +1,304 @@
+/*
+ * tps65218-regulator.c
+ *
+ * Regulator driver for TPS65218 PMIC
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.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 "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License version 2 for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/tps65218.h>
+
+static unsigned int tps65218_ramp_delay = 4000;
+
+enum tps65218_regulators { DCDC1, DCDC2, DCDC3, DCDC4, DCDC5, DCDC6, LDO1 };
+
+#define TPS65218_REGULATOR(_name, _id, _ops, _n, _vr, _vm, _er, _em, _t, \
+                            _lr, _nlr)                          \
+        {                                                       \
+                .name                   = _name,                \
+                .id                     = _id,                  \
+                .ops                    = &_ops,                \
+                .n_voltages             = _n,                   \
+                .type                   = REGULATOR_VOLTAGE,    \
+                .owner                  = THIS_MODULE,          \
+                .vsel_reg               = _vr,                  \
+                .vsel_mask              = _vm,                  \
+                .enable_reg             = _er,                  \
+                .enable_mask            = _em,                  \
+                .volt_table             = _t,                   \
+                .linear_ranges          = _lr,                  \
+                .n_linear_ranges        = _nlr,                 \
+        }                                                       \
+
+#define TPS65218_INFO(_id, _nm, _min, _max)     \
+        {                                               \
+                .id             = _id,                  \
+                .name           = _nm,                  \
+                .min_uV         = _min,                 \
+                .max_uV         = _max,                 \
+        }
+
+static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
+        REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
+        REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
+};
+
+static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
+        REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
+        REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
+};
+
+static const struct regulator_linear_range dcdc4_ranges[] = {
+        REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
+        REGULATOR_LINEAR_RANGE(1550000, 0x10, 0x34, 50000),
+};
+
+static struct tps_info tps65218_pmic_regs[] = {
+        TPS65218_INFO(0, "DCDC1", 850000, 167500),
+        TPS65218_INFO(1, "DCDC2", 850000, 1675000),
+        TPS65218_INFO(2, "DCDC3", 900000, 3400000),
+        TPS65218_INFO(3, "DCDC4", 1175000, 3400000),
+        TPS65218_INFO(4, "DCDC5", 1000000, 1000000),
+        TPS65218_INFO(5, "DCDC6", 1800000, 1800000),
+        TPS65218_INFO(6, "LDO1", 900000, 3400000),
+};
+
+#define TPS65218_OF_MATCH(comp, label) \
+        { \
+                .compatible = comp, \
+                .data = &label, \
+        }
+
+static const struct of_device_id tps65218_of_match[] = {
+        TPS65218_OF_MATCH("ti,tps65218-dcdc1", tps65218_pmic_regs[DCDC1]),
+        TPS65218_OF_MATCH("ti,tps65218-dcdc2", tps65218_pmic_regs[DCDC2]),
+        TPS65218_OF_MATCH("ti,tps65218-dcdc3", tps65218_pmic_regs[DCDC3]),
+        TPS65218_OF_MATCH("ti,tps65218-dcdc4", tps65218_pmic_regs[DCDC4]),
+        TPS65218_OF_MATCH("ti,tps65218-dcdc5", tps65218_pmic_regs[DCDC5]),
+        TPS65218_OF_MATCH("ti,tps65218-dcdc6", tps65218_pmic_regs[DCDC6]),
+        TPS65218_OF_MATCH("ti,tps65218-ldo1", tps65218_pmic_regs[LDO1]),
+};
+MODULE_DEVICE_TABLE(of, tps65218_of_match);
+
+static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
+                                         unsigned selector)
+{
+        int ret;
+        struct tps65218 *tps = rdev_get_drvdata(dev);
+        unsigned int rid = rdev_get_id(dev);
+
+        /* Set the voltage based on vsel value and write protect level is 2 */
+        ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
+                                selector, TPS65218_PROTECT_L1);
+
+        /* Set GO bit for DCDC1/2 to initiate voltage transistion */
+        switch (rid) {
+        case TPS65218_DCDC_1:
+        case TPS65218_DCDC_2:
+                ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
+                                        TPS65218_SLEW_RATE_GO,
+                                        TPS65218_SLEW_RATE_GO,
+                                        TPS65218_PROTECT_L1);
+                break;
+        }
+
+        return ret;
+}
+
+static int tps65218_pmic_enable(struct regulator_dev *dev)
+{
+        struct tps65218 *tps = rdev_get_drvdata(dev);
+        unsigned int rid = rdev_get_id(dev);
+
+        if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
+                return -EINVAL;
+
+        /* Enable the regulator and password protection is level 1 */
+        return tps65218_set_bits(tps, dev->desc->enable_reg,
+                                 dev->desc->enable_mask, dev->desc->enable_mask,
+                                 TPS65218_PROTECT_L1);
+}
+
+static int tps65218_pmic_disable(struct regulator_dev *dev)
+{
+        struct tps65218 *tps = rdev_get_drvdata(dev);
+        unsigned int rid = rdev_get_id(dev);
+
+        if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
+                return -EINVAL;
+
+        /* Disable the regulator and password protection is level 1 */
+        return tps65218_clear_bits(tps, dev->desc->enable_reg,
+                                   dev->desc->enable_mask, TPS65218_PROTECT_L1);
+}
+
+static int tps65218_set_voltage_time_sel(struct regulator_dev *rdev,
+        unsigned int old_selector, unsigned int new_selector)
+{
+        int old_uv, new_uv;
+
+        old_uv = regulator_list_voltage_linear_range(rdev, old_selector);
+        if (old_uv < 0)
+                return old_uv;
+
+        new_uv = regulator_list_voltage_linear_range(rdev, new_selector);
+        if (new_uv < 0)
+                return new_uv;
+
+        return DIV_ROUND_UP(abs(old_uv - new_uv), tps65218_ramp_delay);
+}
+
+/* Operations permitted on DCDC1, DCDC2 */
+static struct regulator_ops tps65218_dcdc12_ops = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = tps65218_pmic_enable,
+        .disable                = tps65218_pmic_disable,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
+        .list_voltage           = regulator_list_voltage_linear_range,
+        .map_voltage            = regulator_map_voltage_linear_range,
+        .set_voltage_time_sel   = tps65218_set_voltage_time_sel,
+};
+
+/* Operations permitted on DCDC3, DCDC4 and LDO1 */
+static struct regulator_ops tps65218_ldo1_dcdc34_ops = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = tps65218_pmic_enable,
+        .disable                = tps65218_pmic_disable,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
+        .list_voltage           = regulator_list_voltage_linear_range,
+        .map_voltage            = regulator_map_voltage_linear_range,
+};
+
+/* Operations permitted on DCDC5, DCDC6 */
+static struct regulator_ops tps65218_dcdc56_pmic_ops = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = tps65218_pmic_enable,
+        .disable                = tps65218_pmic_disable,
+};
+
+static const struct regulator_desc regulators[] = {
+        TPS65218_REGULATOR("DCDC1", TPS65218_DCDC_1, tps65218_dcdc12_ops, 64,
+                           TPS65218_REG_CONTROL_DCDC1,
+                           TPS65218_CONTROL_DCDC1_MASK,
+                           TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC1_EN, NULL,
+                           dcdc1_dcdc2_ranges, 2),
+        TPS65218_REGULATOR("DCDC2", TPS65218_DCDC_2, tps65218_dcdc12_ops, 64,
+                           TPS65218_REG_CONTROL_DCDC2,
+                           TPS65218_CONTROL_DCDC2_MASK,
+                           TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC2_EN, NULL,
+                           dcdc1_dcdc2_ranges, 2),
+        TPS65218_REGULATOR("DCDC3", TPS65218_DCDC_3, tps65218_ldo1_dcdc34_ops,
+                           64, TPS65218_REG_CONTROL_DCDC3,
+                           TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
+                           TPS65218_ENABLE1_DC3_EN, NULL,
+                           ldo1_dcdc3_ranges, 2),
+        TPS65218_REGULATOR("DCDC4", TPS65218_DCDC_4, tps65218_ldo1_dcdc34_ops,
+                           53, TPS65218_REG_CONTROL_DCDC4,
+                           TPS65218_CONTROL_DCDC4_MASK,
+                           TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC4_EN, NULL,
+                           dcdc4_ranges, 2),
+        TPS65218_REGULATOR("DCDC5", TPS65218_DCDC_5, tps65218_dcdc56_pmic_ops,
+                           1, -1, -1, TPS65218_REG_ENABLE1,
+                           TPS65218_ENABLE1_DC5_EN, NULL, NULL, 0),
+        TPS65218_REGULATOR("DCDC6", TPS65218_DCDC_6, tps65218_dcdc56_pmic_ops,
+                           1, -1, -1, TPS65218_REG_ENABLE1,
+                           TPS65218_ENABLE1_DC6_EN, NULL, NULL, 0),
+        TPS65218_REGULATOR("LDO1", TPS65218_LDO_1, tps65218_ldo1_dcdc34_ops, 64,
+                           TPS65218_REG_CONTROL_DCDC4,
+                           TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
+                           TPS65218_ENABLE2_LDO1_EN, NULL, ldo1_dcdc3_ranges,
+                           2),
+};
+
+static int tps65218_regulator_probe(struct platform_device *pdev)
+{
+        struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
+        struct regulator_init_data *init_data;
+        const struct tps_info   *template;
+        struct regulator_dev *rdev;
+        const struct of_device_id       *match;
+        struct regulator_config config = { };
+        int id;
+
+        match = of_match_device(tps65218_of_match, &pdev->dev);
+        if (match) {
+                template = match->data;
+                id = template->id;
+                init_data = of_get_regulator_init_data(&pdev->dev,
+                                                      pdev->dev.of_node);
+        } else {
+                return -ENODEV;
+        }
+
+        platform_set_drvdata(pdev, tps);
+
+        tps->info[id] = &tps65218_pmic_regs[id];
+        config.dev = &pdev->dev;
+        config.init_data = init_data;
+        config.driver_data = tps;
+        config.regmap = tps->regmap;
+
+        rdev = devm_regulator_register(&pdev->dev, &regulators[id], &config);
+        if (IS_ERR(rdev)) {
+                dev_err(tps->dev, "failed to register %s regulator\n",
+                        pdev->name);
+                return PTR_ERR(rdev);
+        }
+
+        /* Save regulator */
+        tps->rdev[id] = rdev;
+
+        return 0;
+}
+
+static int tps65218_regulator_remove(struct platform_device *pdev)
+{
+        struct tps65218 *tps = platform_get_drvdata(pdev);
+        const struct of_device_id       *match;
+        const struct tps_info           *template;
+
+        match = of_match_device(tps65218_of_match, &pdev->dev);
+        template = match->data;
+        regulator_unregister(tps->rdev[template->id]);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver tps65218_regulator_driver = {
+        .driver = {
+                .name = "tps65218-pmic",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(tps65218_of_match),
+        },
+        .probe = tps65218_regulator_probe,
+        .remove = tps65218_regulator_remove,
+};
+
+module_platform_driver(tps65218_regulator_driver);
+
+MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
+MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
+MODULE_ALIAS("platform:tps65218-pmic");
+MODULE_LICENSE("GPL v2");