Date:   Mon, 6 Mar 2017 22:06:58 +0530
From:   Venkat Reddy Talla <vreddytalla@...dia.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <ldewangan@...dia.com>, <vreddytalla@...dia.com>
Subject: [PATCH 1/2] regulator: tps65132: add regulator driver for TI TPS65132

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@...dia.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@...dia.com>
+ *	Venkat Reddy Talla <vreddytalla@...dia.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@...dia.com>");
+MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@...dia.com>");
+MODULE_LICENSE("GPL v2");
--
2.1.4

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