3 files changed, 294 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 936f7ccc9736..00150c21166d 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -781,6 +781,14 @@ config REGULATOR_TPS65090
           This driver provides support for the voltage regulators on the
           TI TPS65090 PMIC.
 
+config REGULATOR_TPS65132
+        tristate "TI TPS65132 Dual Output Power regulators"
+        depends on I2C && GPIOLIB
+        select REGMAP_I2C
+        help
+          This driver supports TPS65132 single inductor - dual output
+          power supply specifcally designed for display panels.
+
 config REGULATOR_TPS65217
         tristate "TI TPS65217 Power regulators"
         depends on MFD_TPS65217
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 14294692beb9..0e9275e78271 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_REGULATOR_TPS6586X) += tps6586x-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
 obj-$(CONFIG_REGULATOR_TPS65912) += tps65912-regulator.o
 obj-$(CONFIG_REGULATOR_TPS80031) += tps80031-regulator.o
+obj-$(CONFIG_REGULATOR_TPS65132) += tps65132-regulator.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o twl6030-regulator.o
 obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress-regulator.o
 obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o
diff --git a/drivers/regulator/tps65132-regulator.c b/drivers/regulator/tps65132-regulator.c
new file mode 100644
index 000000000000..a949206065d4
--- /dev/null
+++ b/drivers/regulator/tps65132-regulator.c
@@ -0,0 +1,285 @@
+/*
+ * TI TPS65132 Regulator driver
+ *
+ * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
+ *              Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#define TPS65132_REG_VPOS               0x00
+#define TPS65132_REG_VNEG               0x01
+#define TPS65132_REG_APPS_DISP_DISN     0x03
+#define TPS65132_REG_CONTROL            0x0FF
+
+#define TPS65132_VOUT_MASK              0x1F
+#define TPS65132_VOUT_N_VOLTAGE         0x15
+#define TPS65132_VOUT_VMIN              4000000
+#define TPS65132_VOUT_VMAX              6000000
+#define TPS65132_VOUT_STEP              100000
+
+#define TPS65132_REG_APPS_DIS_VPOS              BIT(0)
+#define TPS65132_REG_APPS_DIS_VNEG              BIT(1)
+
+#define TPS65132_REGULATOR_ID_VPOS      0
+#define TPS65132_REGULATOR_ID_VNEG      1
+#define TPS65132_MAX_REGULATORS         2
+
+#define TPS65132_ACT_DIS_TIME_SLACK             1000
+
+struct tps65132_reg_pdata {
+        struct gpio_desc *en_gpiod;
+        struct gpio_desc *act_dis_gpiod;
+        unsigned int act_dis_time_us;
+        int ena_gpio_state;
+};
+
+struct tps65132_regulator {
+        struct device *dev;
+        struct regmap *rmap;
+        struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS];
+        struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
+        struct regulator_dev *rdev[TPS65132_MAX_REGULATORS];
+};
+
+static int tps65132_regulator_enable(struct regulator_dev *rdev)
+{
+        struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
+        struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
+        int ret;
+
+        if (!IS_ERR(rpdata->en_gpiod)) {
+                gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
+                rpdata->ena_gpio_state = 1;
+        }
+
+        /* Hardware automatically enable discharge bit in enable */
+        if (rdev->constraints->active_discharge ==
+                        REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
+                ret = regulator_set_active_discharge_regmap(rdev, false);
+                if (ret < 0) {
+                        dev_err(tps->dev, "Failed to disable active discharge: %d\n",
+                                ret);
+                        return ret;
+                }
+        }
+
+        return 0;
+}
+
+static int tps65132_regulator_disable(struct regulator_dev *rdev)
+{
+        struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
+        struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
+
+        if (!IS_ERR(rpdata->en_gpiod)) {
+                gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
+                rpdata->ena_gpio_state = 0;
+        }
+
+        if (!IS_ERR(rpdata->act_dis_gpiod)) {
+                gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
+                usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
+                             TPS65132_ACT_DIS_TIME_SLACK);
+                gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
+        }
+
+        return 0;
+}
+
+static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
+{
+        struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
+        struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
+
+        if (!IS_ERR(rpdata->en_gpiod))
+                return rpdata->ena_gpio_state;
+
+        return 1;
+}
+
+static struct regulator_ops tps65132_regulator_ops = {
+        .enable = tps65132_regulator_enable,
+        .disable = tps65132_regulator_disable,
+        .is_enabled = tps65132_regulator_is_enabled,
+        .list_voltage = regulator_list_voltage_linear,
+        .map_voltage = regulator_map_voltage_linear,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+        .set_active_discharge = regulator_set_active_discharge_regmap,
+};
+
+static int tps65132_of_parse_cb(struct device_node *np,
+                                const struct regulator_desc *desc,
+                                struct regulator_config *config)
+{
+        struct tps65132_regulator *tps = config->driver_data;
+        struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
+        int ret;
+
+        rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
+                                        "enable", 0, &np->fwnode, 0, "enable");
+        if (IS_ERR(rpdata->en_gpiod)) {
+                ret = PTR_ERR(rpdata->en_gpiod);
+
+                /* Ignore the error other than probe defer */
+                if (ret == -EPROBE_DEFER)
+                        return ret;
+                return 0;
+        }
+
+        rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
+                                        tps->dev, "active-discharge", 0,
+                                        &np->fwnode, 0, "active-discharge");
+        if (IS_ERR(rpdata->act_dis_gpiod)) {
+                ret = PTR_ERR(rpdata->act_dis_gpiod);
+
+                /* Ignore the error other than probe defer */
+                if (ret == -EPROBE_DEFER)
+                        return ret;
+
+                return 0;
+        }
+
+        ret = of_property_read_u32(np, "ti,active-discharge-time-us",
+                                   &rpdata->act_dis_time_us);
+        if (ret < 0) {
+                dev_err(tps->dev, "Failed to read active discharge time:%d\n",
+                        ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+#define TPS65132_REGULATOR_DESC(_id, _name)             \
+        [TPS65132_REGULATOR_ID_##_id] = {               \
+                .name = "tps65132-"#_name,              \
+                .supply_name = "vin",                   \
+                .id = TPS65132_REGULATOR_ID_##_id,      \
+                .of_match = of_match_ptr(#_name),       \
+                .of_parse_cb    = tps65132_of_parse_cb, \
+                .ops = &tps65132_regulator_ops,         \
+                .n_voltages = TPS65132_VOUT_N_VOLTAGE,  \
+                .min_uV = TPS65132_VOUT_VMIN,           \
+                .uV_step = TPS65132_VOUT_STEP,          \
+                .enable_time = 500,                     \
+                .vsel_mask = TPS65132_VOUT_MASK,        \
+                .vsel_reg = TPS65132_REG_##_id,         \
+                .active_discharge_off = 0,                      \
+                .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
+                .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
+                .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
+                .type = REGULATOR_VOLTAGE,              \
+                .owner = THIS_MODULE,                   \
+        }
+
+static struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
+        TPS65132_REGULATOR_DESC(VPOS, outp),
+        TPS65132_REGULATOR_DESC(VNEG, outn),
+};
+
+static const struct regmap_range tps65132_no_reg_ranges[] = {
+        regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
+                         TPS65132_REG_CONTROL - 1),
+};
+
+static const struct regmap_access_table tps65132_no_reg_table = {
+        .no_ranges = tps65132_no_reg_ranges,
+        .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
+};
+
+static const struct regmap_config tps65132_regmap_config = {
+        .reg_bits       = 8,
+        .val_bits       = 8,
+        .max_register   = TPS65132_REG_CONTROL + 1,
+        .cache_type     = REGCACHE_NONE,
+        .rd_table       = &tps65132_no_reg_table,
+        .wr_table       = &tps65132_no_reg_table,
+};
+
+static int tps65132_probe(struct i2c_client *client,
+                          const struct i2c_device_id *client_id)
+{
+        struct device *dev = &client->dev;
+        struct tps65132_regulator *tps;
+        struct regulator_config config = { };
+        int id;
+        int ret;
+
+        tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
+        if (!tps)
+                return -ENOMEM;
+
+        tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
+        if (IS_ERR(tps->rmap)) {
+                ret = PTR_ERR(tps->rmap);
+                dev_err(dev, "regmap init failed: %d\n", ret);
+                return ret;
+        }
+
+        i2c_set_clientdata(client, tps);
+        tps->dev = dev;
+
+        for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
+                tps->rdesc[id] = &tps_regs_desc[id];
+
+                config.regmap = tps->rmap;
+                config.dev = dev;
+                config.driver_data = tps;
+
+                tps->rdev[id] = devm_regulator_register(dev,
+                                        tps->rdesc[id], &config);
+                if (IS_ERR(tps->rdev[id])) {
+                        ret = PTR_ERR(tps->rdev[id]);
+                        dev_err(dev, "regulator %s register failed: %d\n",
+                                tps->rdesc[id]->name, ret);
+                        return ret;
+                }
+        }
+        return 0;
+}
+
+static const struct i2c_device_id tps65132_id[] = {
+        {.name = "tps65132",},
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, tps65132_id);
+
+static struct i2c_driver tps65132_i2c_driver = {
+        .driver = {
+                .name = "tps65132",
+                .owner = THIS_MODULE,
+        },
+        .probe = tps65132_probe,
+        .id_table = tps65132_id,
+};
+
+module_i2c_driver(tps65132_i2c_driver);
+
+MODULE_DESCRIPTION("tps65132 regulator driver");
+MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL v2");