regulator: fan53555: Adding driver
Jake Park [Fri, 2 Dec 2011 02:11:31 +0000 (11:11 +0900)]
Adding regulator driver for the device FAN53555.

Bug 892117

Change-Id: I895094d3e0aaeb85cfd33f1bc16008c66961b403
Reviewed-on: http://git-master/r/67862
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Jake Park <jakep@nvidia.com>

drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/fan53555-regulator.c [new file with mode: 0644]
include/linux/regulator/fan53555-regulator.h [new file with mode: 0644]

index 3d8793a..fe311c2 100644 (file)
@@ -368,5 +368,18 @@ config REGULATOR_GPIO_SWITCH
          Say Yes if the given platform have the rail enable through the
          gpios.
 
+config REGULATOR_AAT2870
+       tristate "AnalogicTech AAT2870 Regulators"
+       depends on MFD_AAT2870_CORE
+       help
+         If you have a AnalogicTech AAT2870 say Y to enable the
+         regulator driver.
+
+config REGULATOR_FAN53555
+       tristate "Fairchild FAN53555 DC-DC CPU power supply regulators"
+       default n
+       help
+         This driver supports FAN53555 DC-DC CPU power supply.
+
 endif
 
index bbfa1d1..3de5daf 100644 (file)
@@ -52,5 +52,5 @@ obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 obj-$(CONFIG_REGULATOR_GPIO_SWITCH)    += gpio-switch-regulator.o
-
+obj-$(CONFIG_REGULATOR_FAN53555) += fan53555-regulator.o
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/fan53555-regulator.c b/drivers/regulator/fan53555-regulator.c
new file mode 100644 (file)
index 0000000..13fa79c
--- /dev/null
@@ -0,0 +1,567 @@
+/*
+ * driver/regultor/fan53555-regulator.c
+ *
+ * Driver for FAN53555UC00X, FAN53555UC01X, FAN53555UC03X,
+ *            FAN53555UC04X, FAN53555UC05X
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * 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 version 2.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307, USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/fan53555-regulator.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+/* Register definitions */
+#define FAN53555_REG_VSEL0             0
+#define FAN53555_REG_VSEL1             1
+#define FAN53555_REG_CONTROL           2
+#define FAN53555_REG_ID1               3
+#define FAN53555_REG_ID2               4
+#define FAN53555_REG_MONITOR           5
+
+#define FAN53555_VSEL_BUCK_EN          BIT(7)
+#define FAN53555_VSEL_MODE             BIT(6)
+#define FAN53555_VSEL_NSEL_SHIFT       0
+#define FAN53555_VSEL_NSEL_MASK                0x3F
+
+#define FAN53555_CONTROL_DISCHARGE     BIT(7)
+#define FAN53555_CONTROL_SLEW_SHIFT    4
+#define FAN53555_CONTROL_SLEW_MASK     0x70
+#define FAN53555_CONTROL_RESET         BIT(2)
+
+#define FAN53555_ID1_VENDOR_SHIFT      4
+#define FAN53555_ID1_VENDOR_MASK       0xF0
+#define FAN53555_ID1_DIE_ID_SHIFT      0
+#define FAN53555_ID1_DIE_ID_MASK       0x0F
+
+#define FAN53555_ID2_REV_SHIFT         0
+#define FAN53555_ID2_REV_MASK          0x0F
+
+#define FAN53555_MONITOR_ILIM          BIT(7)
+#define FAN53555_MONITOR_UVLO          BIT(6)
+#define FAN53555_MONITOR_OVP           BIT(5)
+#define FAN53555_MONITOR_POS           BIT(4)
+#define FAN53555_MONITOR_NEG           BIT(3)
+#define FAN53555_MONITOR_RESET_STAT    BIT(2)
+#define FAN53555_MONITOR_OT            BIT(1)
+#define FAN53555_MONITOR_BUCK_STATUS   BIT(0)
+
+#define FAN53555_VSEL0_ID              0
+#define FAN53555_VSEL1_ID              1
+
+#define FAN53555UC00X_ID               0x80
+#define FAN53555UC01X_ID               0x81
+#define FAN53555UC03X_ID               0x83
+#define FAN53555UC04X_ID               0x84
+#define FAN53555UC05X_ID               0x85
+
+#define FAN53555_N_VOLTAGES            64
+
+/* FAN53555 chip information */
+struct fan53555_chip {
+       const char *name;
+       struct device *dev;
+       struct regulator_desc desc;
+       struct i2c_client *client;
+       struct regulator_dev *rdev;
+       struct mutex io_lock;
+       int chip_id;
+       int vsel_id;
+       u8 shadow[6];
+};
+
+#define FAN53555_VOLTAGE(chip_id, vsel)                                \
+       (((chip_id) == FAN53555UC04X_ID) ?                      \
+        ((vsel) * 12826 + 600000) : ((vsel) * 10000 + 600000))
+
+static int fan53555_read(struct fan53555_chip *fan, u8 reg)
+{
+       u8 data;
+       u8 val;
+       int ret;
+
+       data = reg;
+
+       ret = i2c_master_send(fan->client, &data, 1);
+       if (ret < 0)
+               goto out;
+
+       ret = i2c_master_recv(fan->client, &val, 1);
+       if (ret < 0)
+               goto out;
+
+       ret = val;
+out:
+       return ret;
+}
+
+static inline int fan53555_write(struct fan53555_chip *fan, u8 reg, u8 val)
+{
+       u8 msg[2];
+       int ret;
+
+       msg[0] = reg;
+       msg[1] = val;
+
+       ret = i2c_master_send(fan->client, msg, 2);
+       if (ret < 0)
+               return ret;
+       if (ret != 2)
+               return -EIO;
+       return 0;
+}
+
+static int fan53555_read_reg(struct fan53555_chip *fan, u8 reg)
+{
+       int data;
+
+       mutex_lock(&fan->io_lock);
+       data = fan53555_read(fan, reg);
+       if (data < 0)
+               dev_err(fan->dev, "Read from reg 0x%x failed\n", reg);
+       mutex_unlock(&fan->io_lock);
+
+       return data;
+}
+
+static int fan53555_set_bits(struct fan53555_chip *fan, u8 reg, u8 mask, u8 val)
+{
+       int err;
+       u8 data;
+
+       mutex_lock(&fan->io_lock);
+       data = fan->shadow[reg];
+       data &= ~mask;
+       val &= mask;
+       data |= val;
+       err = fan53555_write(fan, reg, data);
+       if (err)
+               dev_err(fan->dev, "write for reg 0x%x failed\n", reg);
+       else
+               fan->shadow[reg] = data;
+       mutex_unlock(&fan->io_lock);
+
+       return err;
+}
+
+static int __fan53555_dcdc_set_voltage(struct fan53555_chip *fan,
+                                      int vsel_id, int min_uV, int max_uV,
+                                      unsigned *selector)
+{
+       int nsel;
+       int uV;
+       int chip_id;
+       int n_voltages;
+
+       chip_id = fan->chip_id;
+       n_voltages = fan->desc.n_voltages;
+
+       if (max_uV < min_uV) {
+               dev_err(fan->dev, "max_uV(%d) < min_uV(%d)\n", max_uV, min_uV);
+               return -EINVAL;
+       }
+       if (min_uV > FAN53555_VOLTAGE(chip_id, n_voltages - 1)) {
+               dev_err(fan->dev, "min_uV(%d) > %d[uV]\n",
+                       min_uV, FAN53555_VOLTAGE(chip_id, n_voltages - 1));
+               return -EINVAL;
+       }
+       if (max_uV < FAN53555_VOLTAGE(chip_id, 0)) {
+               dev_err(fan->dev, "max_uV(%d) < %d[uV]\n",
+                       max_uV, FAN53555_VOLTAGE(chip_id, 0));
+               return -EINVAL;
+       }
+       if ((vsel_id != FAN53555_VSEL0_ID) && (vsel_id != FAN53555_VSEL1_ID)) {
+               dev_err(fan->dev,
+                       "%d is not valid VSEL register ID\n", vsel_id);
+               return -EINVAL;
+       }
+       for (nsel = 0; nsel < n_voltages; nsel++) {
+               uV = FAN53555_VOLTAGE(chip_id, nsel);
+               if (min_uV <= uV && uV <= max_uV) {
+                       if (selector)
+                               *selector = nsel;
+                       return fan53555_set_bits(fan,
+                                                FAN53555_REG_VSEL0 + vsel_id,
+                                                FAN53555_VSEL_NSEL_MASK,
+                                                nsel <<
+                                                FAN53555_VSEL_NSEL_SHIFT);
+               }
+       }
+
+       return -EINVAL;
+}
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static int dbg_fan_show(struct seq_file *s, void *unused)
+{
+       struct fan53555_chip *fan = s->private;
+       int val;
+
+       seq_printf(s, "FAN53555 Registers\n");
+       seq_printf(s, "------------------\n");
+
+       val = fan53555_read_reg(fan, FAN53555_REG_VSEL0);
+       if (val >= 0)
+               seq_printf(s, "Reg VSEL0   Value 0x%02x\n", val);
+
+       val = fan53555_read_reg(fan, FAN53555_REG_VSEL1);
+       if (val >= 0)
+               seq_printf(s, "Reg VSEL1   Value 0x%02x\n", val);
+
+       val = fan53555_read_reg(fan, FAN53555_REG_CONTROL);
+       if (val >= 0)
+               seq_printf(s, "Reg CONTROL Value 0x%02x\n", val);
+
+       val = fan53555_read_reg(fan, FAN53555_REG_ID1);
+       if (val >= 0)
+               seq_printf(s, "Reg ID1     Value 0x%02x\n", val);
+
+       val = fan53555_read_reg(fan, FAN53555_REG_ID2);
+       if (val >= 0)
+               seq_printf(s, "Reg ID2     Value 0x%02x\n", val);
+
+       val = fan53555_read_reg(fan, FAN53555_REG_MONITOR);
+       if (val >= 0)
+               seq_printf(s, "Reg MONITOR Value 0x%02x\n", val);
+
+       return 0;
+}
+
+static int dbg_fan_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, dbg_fan_show, inode->i_private);
+}
+
+static const struct file_operations debug_fops = {
+       .open = dbg_fan_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+};
+
+static void __init fan53555_debuginit(struct fan53555_chip *fan)
+{
+       (void)debugfs_create_file("fan53555", S_IRUGO, NULL, fan, &debug_fops);
+}
+#else
+static void __init fan53555_debuginit(struct fan53555_chip *fan)
+{
+}
+#endif
+
+static int fan53555_dcdc_init(struct fan53555_chip *fan,
+                             struct i2c_client *client,
+                             struct fan53555_regulator_platform_data *pdata)
+{
+       int err;
+       int val;
+
+       err = fan53555_read_reg(fan, FAN53555_REG_VSEL0);
+       if (err < 0)
+               return err;
+       fan->shadow[FAN53555_REG_VSEL0] = (u8)err;
+
+       err = fan53555_read_reg(fan, FAN53555_REG_VSEL1);
+       if (err < 0)
+               return err;
+       fan->shadow[FAN53555_REG_VSEL1] = (u8)err;
+
+       err = fan53555_read_reg(fan, FAN53555_REG_CONTROL);
+       if (err < 0)
+               return err;
+       fan->shadow[FAN53555_REG_CONTROL] = (u8)err;
+
+       err = __fan53555_dcdc_set_voltage(fan,
+                                         FAN53555_VSEL0_ID,
+                                         pdata->init_vsel0_min_uV,
+                                         pdata->init_vsel0_max_uV,
+                                         NULL);
+       if (err < 0)
+               return err;
+
+       val = pdata->vsel0_buck_en ? FAN53555_VSEL_BUCK_EN : 0;
+       val |= pdata->vsel0_mode ? FAN53555_VSEL_MODE : 0;
+       err = fan53555_set_bits(fan,
+                               FAN53555_REG_VSEL0,
+                               FAN53555_VSEL_BUCK_EN | FAN53555_VSEL_MODE,
+                               val);
+       if (err < 0)
+               return err;
+
+       err = __fan53555_dcdc_set_voltage(fan,
+                                         FAN53555_VSEL1_ID,
+                                         pdata->init_vsel1_min_uV,
+                                         pdata->init_vsel1_max_uV,
+                                         NULL);
+       if (err < 0)
+               return err;
+
+       val = pdata->vsel1_buck_en ? FAN53555_VSEL_BUCK_EN : 0;
+       val |= pdata->vsel1_mode ? FAN53555_VSEL_MODE : 0;
+       err = fan53555_set_bits(fan,
+                               FAN53555_REG_VSEL1,
+                               FAN53555_VSEL_BUCK_EN | FAN53555_VSEL_MODE,
+                               val);
+       if (err < 0)
+               return err;
+
+       val = pdata->slew_rate;
+       val <<= FAN53555_CONTROL_SLEW_SHIFT;
+       val |= pdata->output_discharge ? FAN53555_CONTROL_DISCHARGE : 0;
+       err = fan53555_set_bits(fan,
+                               FAN53555_REG_CONTROL,
+                               FAN53555_CONTROL_DISCHARGE |
+                               FAN53555_CONTROL_SLEW_MASK, val);
+       return err;
+}
+
+static int fan53555_dcdc_list_voltage(struct regulator_dev *dev,
+                                     unsigned selector)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+
+       if ((selector < 0) || (selector >= fan->desc.n_voltages))
+               return -EINVAL;
+
+       return FAN53555_VOLTAGE(fan->chip_id, selector);
+}
+
+static int fan53555_dcdc_set_voltage(struct regulator_dev *dev,
+                                    int min_uV, int max_uV,
+                                    unsigned *selector)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+
+       return __fan53555_dcdc_set_voltage(fan, fan->vsel_id, min_uV, max_uV,
+                                          selector);
+}
+
+static int fan53555_dcdc_get_voltage(struct regulator_dev *dev)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+       u8 data;
+
+       if ((fan->vsel_id != FAN53555_VSEL0_ID) &&
+           (fan->vsel_id != FAN53555_VSEL1_ID)) {
+               dev_err(fan->dev,
+                       "%d is not valid VSEL register ID\n", fan->vsel_id);
+               return -EINVAL;
+       }
+       data = fan->shadow[FAN53555_REG_VSEL0 + fan->vsel_id];
+       data &= FAN53555_VSEL_NSEL_MASK;
+       data >>= FAN53555_VSEL_NSEL_SHIFT;
+
+       return FAN53555_VOLTAGE(fan->chip_id, data);
+}
+
+static int fan53555_dcdc_enable(struct regulator_dev *dev)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+
+       if ((fan->vsel_id != FAN53555_VSEL0_ID) &&
+           (fan->vsel_id != FAN53555_VSEL1_ID)) {
+               dev_err(fan->dev,
+                       "%d is not valid VSEL register ID\n", fan->vsel_id);
+               return -EINVAL;
+       }
+
+       return fan53555_set_bits(fan,
+                                FAN53555_REG_VSEL0 + fan->vsel_id,
+                                FAN53555_VSEL_BUCK_EN, FAN53555_VSEL_BUCK_EN);
+}
+
+static int fan53555_dcdc_disable(struct regulator_dev *dev)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+
+       if ((fan->vsel_id != FAN53555_VSEL0_ID) &&
+           (fan->vsel_id != FAN53555_VSEL1_ID)) {
+               dev_err(fan->dev,
+                       "%d is not valid VSEL register ID\n", fan->vsel_id);
+               return -EINVAL;
+       }
+
+       return fan53555_set_bits(fan,
+                                FAN53555_REG_VSEL0 + fan->vsel_id,
+                                FAN53555_VSEL_BUCK_EN, 0);
+}
+
+static int fan53555_dcdc_is_enabled(struct regulator_dev *dev)
+{
+       struct fan53555_chip *fan = rdev_get_drvdata(dev);
+       u8 data;
+
+       if ((fan->vsel_id != FAN53555_VSEL0_ID) &&
+           (fan->vsel_id != FAN53555_VSEL1_ID)) {
+               dev_err(fan->dev,
+                       "%d is not valid VSEL register ID\n", fan->vsel_id);
+               return -EINVAL;
+       }
+       data = fan->shadow[FAN53555_REG_VSEL0 + fan->vsel_id];
+
+       return (data & FAN53555_VSEL_BUCK_EN) ? 1 : 0;
+}
+
+static struct regulator_ops fan53555_dcdc_ops = {
+       .list_voltage = fan53555_dcdc_list_voltage,
+       .set_voltage = fan53555_dcdc_set_voltage,
+       .get_voltage = fan53555_dcdc_get_voltage,
+       .enable = fan53555_dcdc_enable,
+       .disable = fan53555_dcdc_disable,
+       .is_enabled = fan53555_dcdc_is_enabled,
+};
+
+static int __devinit fan53555_probe(struct i2c_client *client,
+                                   const struct i2c_device_id *id)
+{
+       struct fan53555_regulator_platform_data *pdata;
+       struct regulator_init_data *init_data;
+       struct regulator_dev *rdev;
+       struct fan53555_chip *fan;
+       int chip_id;
+       int err;
+
+       pdata = client->dev.platform_data;
+       if (!pdata) {
+               dev_err(&client->dev, "Err: Platform data not found\n");
+               return -EIO;
+       }
+       init_data = &pdata->reg_init_data;
+       fan = kzalloc(sizeof(*fan), GFP_KERNEL);
+       if (!fan) {
+               dev_err(&client->dev, "Err: Memory allocation fails\n");
+               return -ENOMEM;
+       }
+       mutex_init(&fan->io_lock);
+       fan->client = client;
+       fan->dev = &client->dev;
+       fan->vsel_id = pdata->vsel_id;
+       fan->name = id->name;
+       fan->desc.name = id->name;
+       fan->desc.id = 0;
+       fan->desc.irq = 0;
+       fan->desc.ops = &fan53555_dcdc_ops;
+       fan->desc.type = REGULATOR_VOLTAGE;
+       fan->desc.owner = THIS_MODULE;
+       fan->desc.n_voltages = FAN53555_N_VOLTAGES;
+       i2c_set_clientdata(client, fan);
+
+       chip_id = fan53555_read_reg(fan, FAN53555_REG_ID1);
+       if (chip_id < 0) {
+               err = chip_id;
+               dev_err(fan->dev, "Error in reading device %d\n", err);
+               goto fail;
+       }
+
+       switch (chip_id) {
+       case FAN53555UC00X_ID:
+       case FAN53555UC01X_ID:
+       case FAN53555UC03X_ID:
+       case FAN53555UC04X_ID:
+       case FAN53555UC05X_ID:
+               fan->chip_id = chip_id;
+               break;
+       default:
+               dev_err(fan->dev, "Err: not supported device chip id 0x%x",
+                       chip_id);
+               err = -ENODEV;
+               goto fail;
+       }
+
+       err = fan53555_dcdc_init(fan, client, pdata);
+       if (err < 0) {
+               dev_err(fan->dev, "FAN53555 init fails with %d\n", err);
+               goto fail;
+       }
+
+       rdev = regulator_register(&fan->desc, &client->dev, init_data, fan);
+       if (IS_ERR(rdev)) {
+               dev_err(fan->dev, "Failed to register %s\n", id->name);
+               err = PTR_ERR(rdev);
+               goto fail;
+       }
+       fan->rdev = rdev;
+
+       fan53555_debuginit(fan);
+       return 0;
+
+fail:
+       kfree(fan);
+       return err;
+}
+
+/**
+ * fan53555_remove - fan53555 driver i2c remove handler
+ * @client: i2c driver client device structure
+ *
+ * Unregister fan53555 driver as an i2c client device driver
+ */
+static int __devexit fan53555_remove(struct i2c_client *client)
+{
+       struct fan53555_chip *chip = i2c_get_clientdata(client);
+
+       regulator_unregister(chip->rdev);
+       kfree(chip);
+       return 0;
+}
+
+static const struct i2c_device_id fan53555_id[] = {
+       {.name = "fan53555", .driver_data = 0 },
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, fan53555_id);
+
+static struct i2c_driver fan53555_i2c_driver = {
+       .driver = {
+               .name = "fan53555",
+               .owner = THIS_MODULE,
+       },
+       .probe = fan53555_probe,
+       .remove = __devexit_p(fan53555_remove),
+       .id_table = fan53555_id,
+};
+
+/* Module init function */
+static int __init fan53555_init(void)
+{
+       return i2c_add_driver(&fan53555_i2c_driver);
+}
+subsys_initcall_sync(fan53555_init);
+
+/* Module exit function */
+static void __exit fan53555_cleanup(void)
+{
+       i2c_del_driver(&fan53555_i2c_driver);
+}
+module_exit(fan53555_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jake Park<jakep@nvidia.com>");
+MODULE_DESCRIPTION("Regulator Driver for Fairchild FAN53555 Regulator");
+MODULE_ALIAS("platform:fan53555-regulator");
diff --git a/include/linux/regulator/fan53555-regulator.h b/include/linux/regulator/fan53555-regulator.h
new file mode 100644 (file)
index 0000000..e2ed83b
--- /dev/null
@@ -0,0 +1,63 @@
+/*
+ * include/linux/regulator/fan53555.h
+ *
+ * Interface for regulator driver for FairChild fan53555 Processor power supply
+ *
+ * Copyright (C) 2011 NVIDIA Corporation
+ *
+ * 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 in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef __REGULATOR_FAN53555_H
+#define __REGULATOR_FAN53555_H
+
+#include <linux/regulator/machine.h>
+
+/*
+ * struct fan53555_regulator_platform_data - fan53555 regulator platform data.
+ * When VSEL pin is low, VOUT is set by the VSEL0 register.
+ * When VSEL pin is high, VOUT is set by the VSEL1 register
+ *
+ * @reg_init_data: The regulator init data.
+ * @vsel_id: Select the voltage id register.
+ * @vsel0_buck_en: Software Buck enable when EN=high & VSEL=low
+ * @vsel0_mode: Force PWM mode(1) or Allow auto-PFM mode(0) during light load
+ * @init_vsel0_min_uV: initial micro volts when EN=high & VSEL=low
+ * @init_vsel0_max_uV: initial micro volts when EN=high & VSEL=low
+ * @vsel1_buck_en: Software Buck enable when EN=high & VSEL=high
+ * @vsel1_mode: Force PWM mode(1) or Allow auto-PFM mode(0) during light load
+ * @init_vsel1_min_uV: initial micro volts when EN=high & VSEL=high
+ * @init_vsel1_max_uV: initial micro volts when EN=high & VSEL=high
+ * @output_discharge: when the regulator is disabled, VOUT discharges
+ * @slew_rate: slew rate of trasitioning from a low to high voltage
+ */
+
+struct fan53555_regulator_platform_data {
+       struct regulator_init_data reg_init_data;
+       int vsel_id;
+       unsigned vsel0_buck_en:1;
+       unsigned vsel0_mode:1;
+       int init_vsel0_min_uV;
+       int init_vsel0_max_uV;
+       unsigned vsel1_buck_en:1;
+       unsigned vsel1_mode:1;
+       int init_vsel1_min_uV;
+       int init_vsel1_max_uV;
+       unsigned output_discharge:1;
+       unsigned slew_rate:3;
+};
+
+#endif /* __REGULATOR_FAN53555_H */