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Subject[PATCH 1/2] regulator: tps65132: add regulator driver for TI TPS65132
Date
Adding regulator driver for the device TI TPS65132 which is
single inductor - dual output power supply device. TPS65132
device is designed to support general positive/negative
driven applications like TFT display panels.

TPS65132 regulator driver supports to enable/disable and
set voltage on its output.

Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/tps65132-regulator.c | 327 +++++++++++++++++++++++++++++++++
3 files changed, 336 insertions(+)
create mode 100644 drivers/regulator/tps65132-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index be06eb2..85d295d 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -843,6 +843,14 @@ config REGULATOR_TPS80031
converters, 11 general purpose LDOs, VBUS generator and digital
output to control regulators.

+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_TWL4030
tristate "TI TWL4030/TWL5030/TWL6030/TPS659x0 PMIC"
depends on TWL4030_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ef7725e..8bc7faa 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -105,6 +105,7 @@ 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 0000000..f50f3ad
--- /dev/null
+++ b/drivers/regulator/tps65132-regulator.c
@@ -0,0 +1,327 @@
+/*
+ * TI TPS65132 Regulator driver
+ *
+ * Copyright (C) 2015 NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ * Venkat Reddy Talla <vreddytalla@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/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#define tps65132_rails(_name) "tps65132-"#_name
+
+#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_DISN BIT(0)
+#define TPS65132_REG_APPS_DISP 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 regulator_init_data *ridata;
+ unsigned int active_discharge_time;
+ int enable_gpio;
+ int active_discharge_gpio;
+ bool disable_active_discharge;
+};
+
+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_enable(struct regulator_dev *rdev)
+{
+ struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ unsigned int dis_mask;
+ int ret;
+
+ dis_mask = (id == TPS65132_REGULATOR_ID_VPOS) ?
+ TPS65132_REG_APPS_DISP : TPS65132_REG_APPS_DISN;
+
+ if (tps->reg_pdata[id].disable_active_discharge) {
+ ret = regmap_update_bits(tps->rmap, TPS65132_REG_APPS_DISP_DISN,
+ dis_mask, 0);
+ if (ret < 0) {
+ dev_err(tps->dev,
+ "Reg APPS_DISP_DISN update failed: %d\n", ret);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+static int tps65132_disable(struct regulator_dev *rdev)
+{
+ struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+ int act_dis_gpio = tps->reg_pdata[id].active_discharge_gpio;
+ unsigned int act_dis_time_us = tps->reg_pdata[id].active_discharge_time;
+
+ if (gpio_is_valid(act_dis_gpio)) {
+ gpio_set_value_cansleep(act_dis_gpio, 1);
+ usleep_range(act_dis_time_us,
+ act_dis_time_us + TPS65132_ACT_DIS_TIME_SLACK);
+ gpio_set_value_cansleep(act_dis_gpio, 0);
+ }
+
+ return 0;
+}
+
+static struct regulator_ops tps65132_regulator_ops = {
+ .enable = tps65132_enable,
+ .disable = tps65132_disable,
+ .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,
+};
+
+#define TPS65132_REGULATOR_DESC(_id, _name) \
+ [TPS65132_REGULATOR_ID_##_id] = { \
+ .name = tps65132_rails(_name), \
+ .supply_name = "vin", \
+ .id = TPS65132_REGULATOR_ID_##_id, \
+ .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, \
+ .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 struct of_regulator_match tps65132_regulator_matches[] = {
+ { .name = "outp", },
+ { .name = "outn", },
+};
+
+static int tps65132_get_regulator_dt_data(struct device *dev,
+ struct tps65132_regulator *tps65132_regs)
+{
+ struct tps65132_reg_pdata *rpdata;
+ struct device_node *rnode;
+ int id;
+ int ret;
+
+ ret = of_regulator_match(dev, dev->of_node, tps65132_regulator_matches,
+ ARRAY_SIZE(tps65132_regulator_matches));
+ if (ret < 0) {
+ dev_err(dev, "node parsing for regulator failed: %d\n", ret);
+ return ret;
+ }
+
+ for (id = 0; id < ARRAY_SIZE(tps65132_regulator_matches); ++id) {
+ rpdata = &tps65132_regs->reg_pdata[id];
+ rnode = tps65132_regulator_matches[id].of_node;
+ if (!rnode)
+ continue;
+
+ rpdata->ridata = tps65132_regulator_matches[id].init_data;
+ rpdata->enable_gpio = of_get_named_gpio(rnode,
+ "ti,enable-gpio", 0);
+ if (rpdata->enable_gpio == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ rpdata->disable_active_discharge = of_property_read_bool(rnode,
+ "ti,disable-active-discharge");
+
+ rpdata->active_discharge_gpio = of_get_named_gpio(rnode,
+ "ti,active-discharge-gpio", 0);
+ if (rpdata->active_discharge_gpio == -EPROBE_DEFER) {
+ return -EPROBE_DEFER;
+ } else if (gpio_is_valid(rpdata->active_discharge_gpio)) {
+ ret = of_property_read_u32(rnode,
+ "ti,active-discharge-time",
+ &rpdata->active_discharge_time);
+ if (ret < 0) {
+ dev_err(dev, "Discharge time read failed: %d\n",
+ ret);
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
+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_reg_pdata *rpdata;
+ struct regulator_config config = { };
+ struct regulator_desc *rdesc;
+ struct tps65132_regulator *tps;
+ int id;
+ int ret;
+
+ tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
+ if (!tps)
+ return -ENOMEM;
+
+ ret = tps65132_get_regulator_dt_data(dev, tps);
+ if (ret == -EPROBE_DEFER) {
+ dev_err(dev, "Probe deffered\n");
+ return ret;
+ } else if (ret < 0) {
+ dev_err(dev, "Reading data from DT failed: %d\n", ret);
+ return ret;
+ }
+
+ 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) {
+ rdesc = &tps_regs_desc[id];
+ tps->rdesc[id] = rdesc;
+ rpdata = &tps->reg_pdata[id];
+
+ config.regmap = tps->rmap;
+ config.dev = dev;
+ config.init_data = rpdata->ridata;
+ config.driver_data = tps;
+ config.of_node = tps65132_regulator_matches[id].of_node;
+
+ if (gpio_is_valid(rpdata->enable_gpio)) {
+ config.ena_gpio = rpdata->enable_gpio;
+ if (rpdata->ridata &&
+ (rpdata->ridata->constraints.always_on ||
+ rpdata->ridata->constraints.boot_on))
+ config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
+ }
+
+ if (gpio_is_valid(rpdata->active_discharge_gpio)) {
+ ret = devm_gpio_request_one(dev,
+ rpdata->active_discharge_gpio,
+ GPIOF_OUT_INIT_LOW, rdesc->name);
+ if (ret < 0) {
+ dev_err(dev,
+ "act dis gpio req failed for %s: %d\n",
+ rdesc->name, ret);
+ return ret;
+ }
+ } else {
+ dev_info(dev, "No active discharge gpio for regulator %s\n",
+ rdesc->name);
+ }
+
+ tps->rdev[id] = devm_regulator_register(dev, rdesc, &config);
+ if (IS_ERR(tps->rdev[id])) {
+ ret = PTR_ERR(tps->rdev[id]);
+ dev_err(dev, "regulator %s register failed: %d\n",
+ rdesc->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,
+};
+
+static int __init tps65132_init(void)
+{
+ return i2c_add_driver(&tps65132_i2c_driver);
+}
+subsys_initcall(tps65132_init);
+
+static void __exit tps65132_exit(void)
+{
+ i2c_del_driver(&tps65132_i2c_driver);
+}
+module_exit(tps65132_exit);
+
+MODULE_DESCRIPTION("tps65132 regulator driver");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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