[PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Robin Gong]

Add pfuze100 regulator driver.

Signed-off-by: Robin Gong <b38343@freescale.com>
---
 .../devicetree/bindings/regulator/pfuze100.txt     |  113 +++++
 drivers/regulator/Kconfig                          |    7 +
 drivers/regulator/Makefile                         |    1 +
 drivers/regulator/pfuze100-regulator.c             |  489 ++++++++++++++++++++
 include/linux/regulator/pfuze.h                    |   49 ++
 5 files changed, 659 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/regulator/pfuze100.txt
 create mode 100644 drivers/regulator/pfuze100-regulator.c
 create mode 100644 include/linux/regulator/pfuze.h

diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
new file mode 100644
index 0000000..d9fc752
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
@@ -0,0 +1,113 @@
+PFUZE100 family of regulators
+
+Required properties:
+- compatible: "fsl,pfuze100"
+- reg: I2C slave address
+- regulators: This is the list of child nodes that specify the regulator
+  initialization data for defined regulators. Please refer to below doc
+  Documentation/devicetree/bindings/regulator/regulator.txt.
+
+  The valid names for regulators are:
+  sw1ab,sw1c,sw2,sw3a,sw3b,sw4,swbst,vsnvs,vrefddr,vgen1~vgen6
+
+Each regulator is defined using the standard binding for regulators.
+
+Example:
+
+	pmic: pfuze100@08 {
+		compatible = "fsl,pfuze100";
+		reg = <0x08>;
+
+		regulators {
+			sw1a_reg: sw1ab {
+				regulator-min-microvolt = <1100000>;
+				regulator-max-microvolt = <1875000>;
+				regulator-boot-on;
+				regulator-always-on;
+				regulator-ramp-delay = <6250>;
+			};
+
+			sw1c_reg: sw1c {
+				regulator-min-microvolt = <110000>;
+				regulator-max-microvolt = <1875000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw2_reg: sw2 {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw3a_reg: sw3a {
+				regulator-min-microvolt = <400000>;
+				regulator-max-microvolt = <1975000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw3b_reg: sw3b {
+				regulator-min-microvolt = <400000>;
+				regulator-max-microvolt = <1975000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			sw4_reg: sw4 {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <3300000>;
+			};
+
+			swbst_reg: swbst {
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5150000>;
+			};
+
+			snvs_reg: vsnvs {
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <3000000>;
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vref_reg: vrefddr {
+				regulator-boot-on;
+				regulator-always-on;
+			};
+
+			vgen1_reg: vgen1 {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <1550000>;
+			};
+
+			vgen2_reg: vgen2 {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <1550000>;
+			};
+
+			vgen3_reg: vgen3 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+			};
+
+			vgen4_reg: vgen4 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			vgen5_reg: vgen5 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			vgen6_reg: vgen6 {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+		};
+	};
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index f1e6ad9..f913172 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -158,6 +158,13 @@ config REGULATOR_MC13892
 	  Say y here to support the regulators found on the Freescale MC13892
 	  PMIC.
 
+config REGULATOR_PFUZE100
+	tristate "Support regulators on Freescale PFUZE100 PMIC"
+	depends on I2C
+	help
+	  Say y here to support the regulators found on the Freescale PFUZE100
+	  PMIC.
+
 config REGULATOR_ISL6271A
 	tristate "Intersil ISL6271A Power regulator"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ba4a3cf..68cc298 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
 obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
 obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
 obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
+obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
 
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
new file mode 100644
index 0000000..9fc6406
--- /dev/null
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -0,0 +1,489 @@
+/*
+ * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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., 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/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/pfuze.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+
+
+#define PFUZE_NUMREGS		128
+#define PFUZE100_VOL_OFFSET	0
+#define PFUZE100_STANDBY_OFFSET	1
+#define PFUZE100_MODE_OFFSET	3
+#define PFUZE100_CONF_OFFSET	4
+
+#define PFUZE100_DEVICEID	0x0
+#define PFUZE100_REVID		0x3
+#define PFUZE100_FABID		0x3
+
+#define PFUZE100_SW1ABVOL	0x20
+#define PFUZE100_SW1CVOL	0x2e
+#define PFUZE100_SW2VOL		0x35
+#define PFUZE100_SW3AVOL	0x3c
+#define PFUZE100_SW3BVOL	0x43
+#define PFUZE100_SW4VOL		0x4a
+#define PFUZE100_SWBSTCON1	0x66
+#define PFUZE100_VREFDDRCON	0x6a
+#define PFUZE100_VSNVSVOL	0x6b
+#define PFUZE100_VGEN1VOL	0x6c
+#define PFUZE100_VGEN2VOL	0x6d
+#define PFUZE100_VGEN3VOL	0x6e
+#define PFUZE100_VGEN4VOL	0x6f
+#define PFUZE100_VGEN5VOL	0x70
+#define PFUZE100_VGEN6VOL	0x71
+
+struct pfuze_regulator {
+	struct regulator_desc desc;
+	unsigned char stby_reg;
+	unsigned char stby_mask;
+};
+
+enum pfuze_id {
+	PFUZE_ID_PFUZE100,
+	PFUZE_ID_INVALID,
+};
+struct pfuze_chip {
+	struct pfuze_regulator *regulators_desc;
+	int num_regulators;
+	struct regmap *regmap;
+	struct device *dev;
+	enum pfuze_id chip;	/*chip type*/
+	struct regulator_dev *regulators[];
+};
+
+static struct regulator_ops pfuze100_ldo_regulator_ops;
+static struct regulator_ops pfuze100_fixed_regulator_ops;
+static struct regulator_ops pfuze100_sw_regulator_ops;
+static struct regulator_ops pfuze100_swb_regulator_ops;
+
+static const int pfuze100_swbst[] = {
+	5000000, 5050000, 5100000, 5150000,
+};
+
+static const int pfuze100_vsnvs[] = {
+	1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
+};
+
+static const struct i2c_device_id pfuze_device_id[] = {
+	{.name = "pfuze100", .driver_data = PFUZE_ID_PFUZE100},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
+
+
+static const struct of_device_id pfuze_dt_ids[] = {
+	{ .compatible = "fsl,pfuze100", .data = (void *)PFUZE_ID_PFUZE100},
+	{},
+};
+MODULE_DEVICE_TABLE(of, pfuze_dt_ids);
+
+#define PFUZE100_FIXED_REG(_name, base, voltage)	\
+	[PFUZE100_ ## _name] = {	\
+		.desc = {	\
+			.name = #_name,	\
+			.n_voltages = 1,	\
+			.ops = &pfuze100_fixed_regulator_ops,	\
+			.type = REGULATOR_VOLTAGE,	\
+			.id = PFUZE100_ ## _name,	\
+			.owner = THIS_MODULE,	\
+			.min_uV = (voltage),	\
+			.enable_reg = (base),	\
+			.enable_mask = 0x10,	\
+		},	\
+	}
+
+#define PFUZE100_SW_REG(_name, base, min, max, step)	\
+	[PFUZE100_ ## _name] = {	\
+		.desc = {	\
+			.name = #_name,\
+			.n_voltages = ((max) - (min)) / (step) + 1,	\
+			.ops = &pfuze100_sw_regulator_ops,	\
+			.type = REGULATOR_VOLTAGE,	\
+			.id = PFUZE100_ ## _name,	\
+			.owner = THIS_MODULE,	\
+			.min_uV = (min),	\
+			.uV_step = (step),	\
+			.vsel_reg = (base) + PFUZE100_VOL_OFFSET,	\
+			.vsel_mask = 0x3f,	\
+		},	\
+		.stby_reg = (base) + PFUZE100_STANDBY_OFFSET,	\
+		.stby_mask = 0x3f,	\
+	}
+
+#define PFUZE100_SWB_REG(_name, base, mask, voltages)	\
+	[PFUZE100_ ## _name] = {	\
+		.desc = {	\
+			.name = #_name,	\
+			.n_voltages = ARRAY_SIZE(voltages),	\
+			.ops = &pfuze100_swb_regulator_ops,	\
+			.type = REGULATOR_VOLTAGE,	\
+			.id = PFUZE100_ ## _name,	\
+			.owner = THIS_MODULE,	\
+			.volt_table = voltages,	\
+			.vsel_reg = (base),	\
+			.vsel_mask = (mask),	\
+		},	\
+	}
+
+#define PFUZE100_VGEN_REG(_name, base, min, max, step)	\
+	[PFUZE100_ ## _name] = {	\
+		.desc = {	\
+			.name = #_name,	\
+			.n_voltages = ((max) - (min)) / (step) + 1,	\
+			.ops = &pfuze100_ldo_regulator_ops,	\
+			.type = REGULATOR_VOLTAGE,	\
+			.id = PFUZE100_ ## _name,	\
+			.owner = THIS_MODULE,	\
+			.min_uV = (min),	\
+			.uV_step = (step),	\
+			.vsel_reg = (base),	\
+			.vsel_mask = 0xf,	\
+			.enable_reg = (base),	\
+			.enable_mask = 0x10,	\
+		},	\
+		.stby_reg = (base),	\
+		.stby_mask = 0x20,	\
+	}
+
+static struct pfuze_regulator pfuze100_regulators[] = {
+	PFUZE100_SW_REG(SW1AB, PFUZE100_SW1ABVOL, 300000, 1875000, 25000),
+	PFUZE100_SW_REG(SW1C, PFUZE100_SW1CVOL, 300000, 1875000, 25000),
+	PFUZE100_SW_REG(SW2, PFUZE100_SW2VOL, 400000, 1975000, 25000),
+	PFUZE100_SW_REG(SW3A, PFUZE100_SW3AVOL, 400000, 1975000, 25000),
+	PFUZE100_SW_REG(SW3B, PFUZE100_SW3BVOL, 400000, 1975000, 25000),
+	PFUZE100_SW_REG(SW4, PFUZE100_SW4VOL, 400000, 1975000, 25000),
+	PFUZE100_SWB_REG(SWBST, PFUZE100_SWBSTCON1, 0x3 , pfuze100_swbst),
+	PFUZE100_SWB_REG(VSNVS, PFUZE100_VSNVSVOL, 0x7, pfuze100_vsnvs),
+	PFUZE100_FIXED_REG(VREFDDR, PFUZE100_VREFDDRCON, 750000),
+	PFUZE100_VGEN_REG(VGEN1, PFUZE100_VGEN1VOL, 800000, 1550000, 50000),
+	PFUZE100_VGEN_REG(VGEN2, PFUZE100_VGEN2VOL, 800000, 1550000, 50000),
+	PFUZE100_VGEN_REG(VGEN3, PFUZE100_VGEN3VOL, 1800000, 3300000, 100000),
+	PFUZE100_VGEN_REG(VGEN4, PFUZE100_VGEN4VOL, 1800000, 3300000, 100000),
+	PFUZE100_VGEN_REG(VGEN5, PFUZE100_VGEN5VOL, 1800000, 3300000, 100000),
+	PFUZE100_VGEN_REG(VGEN6, PFUZE100_VGEN6VOL, 1800000, 3300000, 100000),
+};
+
+
+static int pfuze100_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
+{
+	struct pfuze_chip *pfuze100 = rdev_get_drvdata(rdev);
+	int id = pfuze100->regulators_desc->desc.id;
+	unsigned int val, ramp_bits, reg;
+	int ret;
+
+	if (id < PFUZE100_SWBST) {
+		if (id == PFUZE100_SW1AB)
+			reg = PFUZE100_SW1ABVOL;
+		else
+			reg = PFUZE100_SW1CVOL + (id - PFUZE100_SW1C) * 7;
+		regmap_read(pfuze100->regmap, reg, &val);
+		if (val & 0x40)
+			ramp_delay = 50000 / (4 * ramp_delay);
+		else
+			ramp_delay = 25000 / (2 * ramp_delay);
+		if (id <= PFUZE100_SW1C)
+			ramp_delay = 25000 / (2 * ramp_delay);
+		ramp_bits = (ramp_delay >> 1) - (ramp_delay >> 3);
+		ret = regmap_update_bits(pfuze100->regmap, reg + 4 , 0xc0,
+				ramp_bits << 6);
+		if (ret < 0)
+			dev_err(pfuze100->dev, "SW ramp failed,err %d\nr", ret);
+
+	} else
+		ret = -EACCES;
+	return ret;
+}
+
+static struct regulator_ops pfuze100_ldo_regulator_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static struct regulator_ops pfuze100_fixed_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+};
+
+static struct regulator_ops pfuze100_sw_regulator_ops = {
+	.list_voltage = regulator_list_voltage_linear,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
+	.set_ramp_delay = pfuze100_set_ramp_delay,
+};
+
+static struct regulator_ops pfuze100_swb_regulator_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+
+};
+
+#ifdef CONFIG_OF
+
+static int  pfuze_get_num_regulators_dt(struct device *dev)
+{
+	struct device_node *parent, *child;
+	int num = 0;
+
+	of_node_get(dev->parent->of_node);
+	parent = of_find_node_by_name(dev->parent->of_node, "regulators");
+	if (!parent)
+		return -ENODEV;
+
+	for_each_child_of_node(parent, child)
+		num++;
+
+	return num;
+}
+
+static struct pfuze_regulator_init_data *pfuze_parse_regulators_dt(
+	struct pfuze_chip *chip, struct pfuze_regulator *regulators,
+	int num_regulators)
+{
+	struct device *dev = chip->dev;
+	struct pfuze_regulator_init_data *data, *p;
+	struct device_node *parent, *child;
+	int i;
+
+	of_node_get(dev->parent->of_node);
+	parent = of_find_node_by_name(dev->parent->of_node, "regulators");
+	if (!parent)
+		return NULL;
+
+	data = devm_kzalloc(dev, sizeof(*data) * chip->num_regulators,
+			    GFP_KERNEL);
+	if (!data)
+		return NULL;
+	p = data;
+	for_each_child_of_node(parent, child) {
+		for (i = 0; i < num_regulators; i++) {
+			if (!of_node_cmp(child->name,
+					 regulators[i].desc.name)) {
+				p->id = i;
+				p->init_data = of_get_regulator_init_data(
+							dev, child);
+				p->node = child;
+				p++;
+				break;
+			}
+		}
+	}
+
+	return data;
+}
+
+#else
+
+static int pfuze_get_num_regulators_dt(struct device *dev)
+{
+		return -ENODEV;
+
+}
+
+static struct pfuze_regulator_init_data *pfuze_parse_regulators_dt(
+	struct pfuze_chip *chip, struct pfuze_regulator *regulators,
+	int num_regulators)
+{
+		return NULL;
+
+}
+#endif
+
+static int pfuze_identify(struct pfuze_chip *pfuze_chip)
+{
+	unsigned int value;
+	int ret;
+	ret = regmap_read(pfuze_chip->regmap, PFUZE100_DEVICEID, &value);
+	if (ret)
+		return ret;
+	switch (value & 0x0f) {
+	case 0x0:
+		pfuze_chip->chip = PFUZE_ID_PFUZE100;
+		break;
+	default:
+		pfuze_chip->chip = PFUZE_ID_INVALID;
+		dev_warn(pfuze_chip->dev, "Illegal ID: %x\n", value);
+		break;
+	}
+	ret = regmap_read(pfuze_chip->regmap, PFUZE100_REVID, &value);
+	if (ret)
+		return ret;
+	dev_info(pfuze_chip->dev,
+		 "ID: %d,Full lay: %x ,Metal lay: %x\n",
+		 pfuze_chip->chip, (value & 0xf0) >> 4, value & 0x0f);
+	ret = regmap_read(pfuze_chip->regmap, PFUZE100_FABID, &value);
+	if (ret)
+		return ret;
+	dev_info(pfuze_chip->dev, "FAB: %x ,FIN: %x\n",
+		 (value & 0xc) >> 2, value & 0x3);
+	return (pfuze_chip->chip == PFUZE_ID_INVALID) ? -ENODEV : 0;
+}
+
+static struct regmap_config pfuze_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = PFUZE_NUMREGS,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static int pfuze100_regulator_probe(struct i2c_client *client,
+				    const struct i2c_device_id *id)
+{
+	const struct of_device_id *of_id;
+	struct i2c_driver *idrv = to_i2c_driver(client->dev.driver);
+	struct pfuze_chip *pfuze_chip;
+	struct pfuze_regulator_platform_data *pdata =
+	    dev_get_platdata(&client->dev);
+	struct pfuze_regulator_init_data *pfuze_data;
+	struct regulator_config config = { };
+	int i, ret;
+	int num_regulators = 0;
+
+	of_id = of_match_device(pfuze_dt_ids, &client->dev);
+	if (of_id)
+		idrv->id_table = (const struct i2c_device_id *) of_id->data;
+
+	num_regulators = pfuze_get_num_regulators_dt(&client->dev);
+	if (num_regulators <= 0 && pdata)
+		num_regulators = pdata->num_regulators;
+	if (num_regulators <= 0) {
+		dev_err(&client->dev, "no platform data,please add it!\n");
+		ret = -EINVAL;
+		return ret;
+	}
+
+	pfuze_chip = devm_kzalloc(&client->dev, sizeof(*pfuze_chip) +
+		       num_regulators * sizeof(pfuze_chip->regulators[0]),
+			GFP_KERNEL);
+	if (!pfuze_chip) {
+		dev_err(&client->dev, "%s(): Memory allocation failed\n",
+						__func__);
+		return -ENOMEM;
+	}
+
+	dev_set_drvdata(&client->dev, pfuze_chip);
+	pfuze_chip->dev = &client->dev;
+
+	pfuze_chip->regmap = devm_regmap_init_i2c(client, &pfuze_regmap_config);
+	if (IS_ERR(pfuze_chip->regmap)) {
+		ret = PTR_ERR(pfuze_chip->regmap);
+		dev_err(&client->dev,
+			"%s(): regmap allocation failed with err %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	ret = pfuze_identify(pfuze_chip);
+	if (ret) {
+		dev_err(&client->dev, "unrecognized pfuze chip ID!\n");
+		return ret;
+	}
+
+	pfuze_chip->num_regulators = num_regulators;
+	pfuze_chip->regulators_desc = pfuze100_regulators;
+	pfuze_data = pfuze_parse_regulators_dt(pfuze_chip, pfuze100_regulators,
+					ARRAY_SIZE(pfuze100_regulators));
+
+	for (i = 0; i < num_regulators; i++) {
+		struct regulator_init_data *init_data;
+		struct regulator_desc *desc;
+		struct device_node *node = NULL;
+		int val;
+		int id;
+
+		if (pfuze_data) {
+			id = pfuze_data[i].id;
+			init_data = pfuze_data[i].init_data;
+			node = pfuze_data[i].node;
+		} else {
+			id = pdata->regulators[i].id;
+			init_data = pdata->regulators[i].init_data;
+		}
+
+		desc = &pfuze100_regulators[id].desc;
+
+		/* SW2~SW4 high bit check and modify the voltage value table */
+		if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
+			regmap_read(pfuze_chip->regmap, PFUZE100_SW2VOL +
+					(i - PFUZE100_SW2) * 7, &val);
+			if (val & 0x40) {
+				pfuze100_regulators[id].desc.min_uV = 800000;
+				pfuze100_regulators[id].desc.uV_step = 50000;
+			}
+		}
+		config.dev = &client->dev;
+		config.init_data = init_data;
+		config.driver_data = pfuze_chip;
+		config.of_node = node;
+
+		pfuze_chip->regulators[i] = regulator_register(desc, &config);
+		if (IS_ERR(pfuze_chip->regulators[i])) {
+			dev_err(&client->dev, "register regulator%s failed\n",
+				pfuze100_regulators[i].desc.name);
+			ret = PTR_ERR(pfuze_chip->regulators[i]);
+			while (--i >= 0)
+				regulator_unregister(pfuze_chip->regulators[i]);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int pfuze100_regulator_remove(struct i2c_client *client)
+{
+	int i;
+	struct pfuze_chip *pfuze_chip = dev_get_drvdata(&client->dev);
+
+	for (i = 0; i < pfuze_chip->num_regulators; i++)
+		regulator_unregister(pfuze_chip->regulators[i]);
+	kfree(pfuze_chip);
+
+	return 0;
+}
+
+static struct i2c_driver pfuze_driver = {
+	.id_table = pfuze_device_id,
+	.driver = {
+		.name = "pfuze100-regulator",
+		.owner = THIS_MODULE,
+		.of_match_table = pfuze_dt_ids,
+	},
+	.probe = pfuze100_regulator_probe,
+	.remove = pfuze100_regulator_remove,
+};
+
+module_i2c_driver(pfuze_driver);
+
+MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
+MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
+MODULE_ALIAS("pfuze100-regulator");
diff --git a/include/linux/regulator/pfuze.h b/include/linux/regulator/pfuze.h
new file mode 100644
index 0000000..9791024
--- /dev/null
+++ b/include/linux/regulator/pfuze.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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 __LINUX_REG_PFUZE_H
+#define __LINUX_REG_PFUZE_H
+
+#define PFUZE100_SW1AB		0
+#define PFUZE100_SW1C		1
+#define PFUZE100_SW2		2
+#define PFUZE100_SW3A		3
+#define PFUZE100_SW3B		4
+#define PFUZE100_SW4		5
+#define PFUZE100_SWBST		6
+#define PFUZE100_VSNVS		7
+#define PFUZE100_VREFDDR	8
+#define PFUZE100_VGEN1		9
+#define PFUZE100_VGEN2		10
+#define PFUZE100_VGEN3		11
+#define PFUZE100_VGEN4		12
+#define PFUZE100_VGEN5		13
+#define PFUZE100_VGEN6		14
+
+
+struct regulator_init_data;
+struct pfuze_regulator_init_data {
+	int id;
+	struct regulator_init_data *init_data;
+	struct device_node *node;
+};
+struct pfuze_regulator_platform_data {
+	int num_regulators;
+	struct pfuze_regulator_init_data *regulators;
+};
+
+#endif
-- 
1.7.5.4

Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 2051 bytes --]

On Fri, Jul 12, 2013 at 12:54:15PM +0800, Robin Gong wrote:
> Add pfuze100 regulator driver.

This looks mostly good.  A few small issues below but nothing major.

> +enum pfuze_id {
> +	PFUZE_ID_PFUZE100,
> +	PFUZE_ID_INVALID,
> +};
> +struct pfuze_chip {

Missing blank line here - there are a few other small coding style
things, checkpatch should help.

> +static struct regulator_ops pfuze100_ldo_regulator_ops;
> +static struct regulator_ops pfuze100_fixed_regulator_ops;
> +static struct regulator_ops pfuze100_sw_regulator_ops;
> +static struct regulator_ops pfuze100_swb_regulator_ops;

Better to just reorder things so that no forward declaration is needed.

> +static const int pfuze100_swbst[] = {
> +	5000000, 5050000, 5100000, 5150000,
> +};

This looks like a linear map, the steps are all 50mV?

> +	num_regulators = pfuze_get_num_regulators_dt(&client->dev);
> +	if (num_regulators <= 0 && pdata)
> +		num_regulators = pdata->num_regulators;
> +	if (num_regulators <= 0) {
> +		dev_err(&client->dev, "no platform data,please add it!\n");
> +		ret = -EINVAL;
> +		return ret;

You should just register all the regulators rather than only registering
those that the user explicitly selects.  This allows users to inpect the
current configuration and simplifies the code - for example you don't
need to count the DT nodes and you can just have a simple array in the
platform data (see how wm831x does this for an example).

> +		/* SW2~SW4 high bit check and modify the voltage value table */
> +		if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
> +			regmap_read(pfuze_chip->regmap, PFUZE100_SW2VOL +
> +					(i - PFUZE100_SW2) * 7, &val);
> +			if (val & 0x40) {
> +				pfuze100_regulators[id].desc.min_uV = 800000;
> +				pfuze100_regulators[id].desc.uV_step = 50000;
> +			}
> +		}

You should really be doing this on a copy of the regulators table rather
than on the table itself.

> +	for (i = 0; i < pfuze_chip->num_regulators; i++)
> +		regulator_unregister(pfuze_chip->regulators[i]);
> +	kfree(pfuze_chip);

Use devm_kzalloc().

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Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Robin Gong]

Mark, 
	Thanks for your kindly review, please see below comments.

On Fri, Jul 12, 2013 at 03:40:37PM +0100, Mark Brown wrote:
> On Fri, Jul 12, 2013 at 12:54:15PM +0800, Robin Gong wrote:
> > Add pfuze100 regulator driver.
> 
> This looks mostly good.  A few small issues below but nothing major.
> 
> > +enum pfuze_id {
> > +	PFUZE_ID_PFUZE100,
> > +	PFUZE_ID_INVALID,
> > +};
> > +struct pfuze_chip {
> 
> Missing blank line here - there are a few other small coding style
> things, checkpatch should help.
>
Thanks Mark, I will check carefully, although I have run the script...
> > +static struct regulator_ops pfuze100_ldo_regulator_ops;
> > +static struct regulator_ops pfuze100_fixed_regulator_ops;
> > +static struct regulator_ops pfuze100_sw_regulator_ops;
> > +static struct regulator_ops pfuze100_swb_regulator_ops;
> 
> Better to just reorder things so that no forward declaration is needed.
> 
Accept.
> > +static const int pfuze100_swbst[] = {
> > +	5000000, 5050000, 5100000, 5150000,
> > +};
> 
> This looks like a linear map, the steps are all 50mV?
> 
Yes, but the swbst regulator share the same define type with the vsnvs regulator, and the later voltage table is not linear, so I use volt_table in swbst regulator . I don't want to  add another regulator type for this.
> > +	num_regulators = pfuze_get_num_regulators_dt(&client->dev);
> > +	if (num_regulators <= 0 && pdata)
> > +		num_regulators = pdata->num_regulators;
> > +	if (num_regulators <= 0) {
> > +		dev_err(&client->dev, "no platform data,please add it!\n");
> > +		ret = -EINVAL;
> > +		return ret;
> 
> You should just register all the regulators rather than only registering
> those that the user explicitly selects.  This allows users to inpect the
> current configuration and simplifies the code - for example you don't
> need to count the DT nodes and you can just have a simple array in the
> platform data (see how wm831x does this for an example).
> 
Yes, it will simplifies the code, but sometimes we will not use all the regulators on boards, in this case, Is it better that only register the available regulators?
> > +		/* SW2~SW4 high bit check and modify the voltage value table */
> > +		if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
> > +			regmap_read(pfuze_chip->regmap, PFUZE100_SW2VOL +
> > +					(i - PFUZE100_SW2) * 7, &val);
> > +			if (val & 0x40) {
> > +				pfuze100_regulators[id].desc.min_uV = 800000;
> > +				pfuze100_regulators[id].desc.uV_step = 50000;
> > +			}
> > +		}
> 
> You should really be doing this on a copy of the regulators table rather
> than on the table itself.
> 
everyone of the four regulators(SW2~SW4) has two different linear voltage table which decided by the specific bit(one regulator ,one different bit) . So  will modify the voltage table dynamically before regulator register. I think this way is more simple , although looks little weird and uncomfortable.
> > +	for (i = 0; i < pfuze_chip->num_regulators; i++)
> > +		regulator_unregister(pfuze_chip->regulators[i]);
> > +	kfree(pfuze_chip);
> 
> Use devm_kzalloc().
Accept

Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1871 bytes --]

On Sat, Jul 13, 2013 at 12:15:12AM +0800, Robin Gong wrote:

Please fix your mail program to word wrap between paragraphs.

> On Fri, Jul 12, 2013 at 03:40:37PM +0100, Mark Brown wrote:

> > > +static const int pfuze100_swbst[] = {
> > > +	5000000, 5050000, 5100000, 5150000,
> > > +};

> > This looks like a linear map, the steps are all 50mV?

> Yes, but the swbst regulator share the same define type with the vsnvs
> regulator, and the later voltage table is not linear, so I use
> volt_table in swbst regulator . I don't want to  add another regulator
> type for this.

You should do so; it's not hard.

> > You should just register all the regulators rather than only registering
> > those that the user explicitly selects.  This allows users to inpect the
> > current configuration and simplifies the code - for example you don't
> > need to count the DT nodes and you can just have a simple array in the
> > platform data (see how wm831x does this for an example).

> Yes, it will simplifies the code, but sometimes we will not use all
> the regulators on boards, in this case, Is it better that only
> register the available regulators?

It's better to have everything, that way the framework can do things
like power down unused regualtors that got left enabled.

> > You should really be doing this on a copy of the regulators table rather
> > than on the table itself.

> everyone of the four regulators(SW2~SW4) has two different linear
> voltage table which decided by the specific bit(one regulator ,one
> different bit) . So  will modify the voltage table dynamically before
> regulator register. I think this way is more simple , although looks
> little weird and uncomfortable.

You're missing the point here.  You shouldn't be modifying global data
(which should be marked as const) at all, you should be working on a
copy of it if it needs modifying.

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Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Shawn Guo]

The patch looks good.  Comments below are mostly random coding style
nitpicks.

On Fri, Jul 12, 2013 at 12:54:15PM +0800, Robin Gong wrote:
> Add pfuze100 regulator driver.
> 
> Signed-off-by: Robin Gong <b38343@freescale.com>
> ---
>  .../devicetree/bindings/regulator/pfuze100.txt     |  113 +++++
>  drivers/regulator/Kconfig                          |    7 +
>  drivers/regulator/Makefile                         |    1 +
>  drivers/regulator/pfuze100-regulator.c             |  489 ++++++++++++++++++++
>  include/linux/regulator/pfuze.h                    |   49 ++

We should probably name the header in the same way as driver file, so
pfuze100.h?

>  5 files changed, 659 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/regulator/pfuze100.txt
>  create mode 100644 drivers/regulator/pfuze100-regulator.c
>  create mode 100644 include/linux/regulator/pfuze.h
> 
> diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
> new file mode 100644
> index 0000000..d9fc752
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
> @@ -0,0 +1,113 @@
> +PFUZE100 family of regulators
> +
> +Required properties:
> +- compatible: "fsl,pfuze100"
> +- reg: I2C slave address
> +- regulators: This is the list of child nodes that specify the regulator
> +  initialization data for defined regulators. Please refer to below doc
> +  Documentation/devicetree/bindings/regulator/regulator.txt.
> +
> +  The valid names for regulators are:
> +  sw1ab,sw1c,sw2,sw3a,sw3b,sw4,swbst,vsnvs,vrefddr,vgen1~vgen6
> +
> +Each regulator is defined using the standard binding for regulators.
> +
> +Example:
> +
> +	pmic: pfuze100@08 {
> +		compatible = "fsl,pfuze100";
> +		reg = <0x08>;
> +
> +		regulators {
> +			sw1a_reg: sw1ab {
> +				regulator-min-microvolt = <1100000>;
> +				regulator-max-microvolt = <1875000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +				regulator-ramp-delay = <6250>;
> +			};
> +
> +			sw1c_reg: sw1c {
> +				regulator-min-microvolt = <110000>;
> +				regulator-max-microvolt = <1875000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			sw2_reg: sw2 {
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			sw3a_reg: sw3a {
> +				regulator-min-microvolt = <400000>;
> +				regulator-max-microvolt = <1975000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			sw3b_reg: sw3b {
> +				regulator-min-microvolt = <400000>;
> +				regulator-max-microvolt = <1975000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			sw4_reg: sw4 {
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <3300000>;
> +			};
> +
> +			swbst_reg: swbst {
> +				regulator-min-microvolt = <5000000>;
> +				regulator-max-microvolt = <5150000>;
> +			};
> +
> +			snvs_reg: vsnvs {
> +				regulator-min-microvolt = <1200000>;
> +				regulator-max-microvolt = <3000000>;
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			vref_reg: vrefddr {
> +				regulator-boot-on;
> +				regulator-always-on;
> +			};
> +
> +			vgen1_reg: vgen1 {
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <1550000>;
> +			};
> +
> +			vgen2_reg: vgen2 {
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <1550000>;
> +			};
> +
> +			vgen3_reg: vgen3 {
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <3300000>;
> +			};
> +
> +			vgen4_reg: vgen4 {
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-always-on;
> +			};
> +
> +			vgen5_reg: vgen5 {
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-always-on;
> +			};
> +
> +			vgen6_reg: vgen6 {
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-always-on;
> +			};
> +		};
> +	};
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index f1e6ad9..f913172 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -158,6 +158,13 @@ config REGULATOR_MC13892
>  	  Say y here to support the regulators found on the Freescale MC13892
>  	  PMIC.
>  
> +config REGULATOR_PFUZE100
> +	tristate "Support regulators on Freescale PFUZE100 PMIC"
> +	depends on I2C
> +	help
> +	  Say y here to support the regulators found on the Freescale PFUZE100
> +	  PMIC.
> +
>  config REGULATOR_ISL6271A
>  	tristate "Intersil ISL6271A Power regulator"
>  	depends on I2C
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index ba4a3cf..68cc298 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -72,6 +72,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
>  obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
>  obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
>  obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
> +obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
>  
>  
>  ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
> diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
> new file mode 100644
> index 0000000..9fc6406
> --- /dev/null
> +++ b/drivers/regulator/pfuze100-regulator.c
> @@ -0,0 +1,489 @@
> +/*
> + * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
> + *
> + * 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., 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/of.h>
> +#include <linux/of_device.h>
> +#include <linux/regulator/of_regulator.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/regulator/pfuze.h>
> +#include <linux/i2c.h>
> +#include <linux/slab.h>
> +#include <linux/regmap.h>
> +
> +
> +#define PFUZE_NUMREGS		128
> +#define PFUZE100_VOL_OFFSET	0
> +#define PFUZE100_STANDBY_OFFSET	1
> +#define PFUZE100_MODE_OFFSET	3
> +#define PFUZE100_CONF_OFFSET	4
> +
> +#define PFUZE100_DEVICEID	0x0
> +#define PFUZE100_REVID		0x3
> +#define PFUZE100_FABID		0x3
> +
> +#define PFUZE100_SW1ABVOL	0x20
> +#define PFUZE100_SW1CVOL	0x2e
> +#define PFUZE100_SW2VOL		0x35
> +#define PFUZE100_SW3AVOL	0x3c
> +#define PFUZE100_SW3BVOL	0x43
> +#define PFUZE100_SW4VOL		0x4a
> +#define PFUZE100_SWBSTCON1	0x66
> +#define PFUZE100_VREFDDRCON	0x6a
> +#define PFUZE100_VSNVSVOL	0x6b
> +#define PFUZE100_VGEN1VOL	0x6c
> +#define PFUZE100_VGEN2VOL	0x6d
> +#define PFUZE100_VGEN3VOL	0x6e
> +#define PFUZE100_VGEN4VOL	0x6f
> +#define PFUZE100_VGEN5VOL	0x70
> +#define PFUZE100_VGEN6VOL	0x71
> +
> +struct pfuze_regulator {
> +	struct regulator_desc desc;
> +	unsigned char stby_reg;
> +	unsigned char stby_mask;
> +};
> +
> +enum pfuze_id {
> +	PFUZE_ID_PFUZE100,
> +	PFUZE_ID_INVALID,
> +};

Have a blank line here.

Is there any other valid ID other than PFUZE_ID_PFUZE100?  If not, we
may not need this pfuze_id at all.  All the use of it is in
pfuze_identify() for dev_info output.

> +struct pfuze_chip {
> +	struct pfuze_regulator *regulators_desc;
> +	int num_regulators;
> +	struct regmap *regmap;
> +	struct device *dev;
> +	enum pfuze_id chip;	/*chip type*/

/* comment */

Also I do not see much necessity of this member.  It's only used in
function pfuze_identify(), from what I can see.

> +	struct regulator_dev *regulators[];
> +};
> +
> +static struct regulator_ops pfuze100_ldo_regulator_ops;
> +static struct regulator_ops pfuze100_fixed_regulator_ops;
> +static struct regulator_ops pfuze100_sw_regulator_ops;
> +static struct regulator_ops pfuze100_swb_regulator_ops;
> +
> +static const int pfuze100_swbst[] = {
> +	5000000, 5050000, 5100000, 5150000,
> +};
> +
> +static const int pfuze100_vsnvs[] = {
> +	1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
> +};
> +
> +static const struct i2c_device_id pfuze_device_id[] = {
> +	{.name = "pfuze100", .driver_data = PFUZE_ID_PFUZE100},

You do not use .driver_data in the driver at all, and can just drop it.

> +	{},
> +};
> +MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
> +
> +

Drop one blank line.

> +static const struct of_device_id pfuze_dt_ids[] = {
> +	{ .compatible = "fsl,pfuze100", .data = (void *)PFUZE_ID_PFUZE100},

You do not use .data in the driver at all, and can just drop it.

> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, pfuze_dt_ids);
> +
> +#define PFUZE100_FIXED_REG(_name, base, voltage)	\
> +	[PFUZE100_ ## _name] = {	\
> +		.desc = {	\
> +			.name = #_name,	\
> +			.n_voltages = 1,	\
> +			.ops = &pfuze100_fixed_regulator_ops,	\
> +			.type = REGULATOR_VOLTAGE,	\
> +			.id = PFUZE100_ ## _name,	\
> +			.owner = THIS_MODULE,	\
> +			.min_uV = (voltage),	\
> +			.enable_reg = (base),	\
> +			.enable_mask = 0x10,	\
> +		},	\
> +	}
> +
> +#define PFUZE100_SW_REG(_name, base, min, max, step)	\
> +	[PFUZE100_ ## _name] = {	\
> +		.desc = {	\
> +			.name = #_name,\
> +			.n_voltages = ((max) - (min)) / (step) + 1,	\
> +			.ops = &pfuze100_sw_regulator_ops,	\
> +			.type = REGULATOR_VOLTAGE,	\
> +			.id = PFUZE100_ ## _name,	\
> +			.owner = THIS_MODULE,	\
> +			.min_uV = (min),	\
> +			.uV_step = (step),	\
> +			.vsel_reg = (base) + PFUZE100_VOL_OFFSET,	\
> +			.vsel_mask = 0x3f,	\
> +		},	\
> +		.stby_reg = (base) + PFUZE100_STANDBY_OFFSET,	\
> +		.stby_mask = 0x3f,	\
> +	}
> +
> +#define PFUZE100_SWB_REG(_name, base, mask, voltages)	\
> +	[PFUZE100_ ## _name] = {	\
> +		.desc = {	\
> +			.name = #_name,	\
> +			.n_voltages = ARRAY_SIZE(voltages),	\
> +			.ops = &pfuze100_swb_regulator_ops,	\
> +			.type = REGULATOR_VOLTAGE,	\
> +			.id = PFUZE100_ ## _name,	\
> +			.owner = THIS_MODULE,	\
> +			.volt_table = voltages,	\
> +			.vsel_reg = (base),	\
> +			.vsel_mask = (mask),	\
> +		},	\
> +	}
> +
> +#define PFUZE100_VGEN_REG(_name, base, min, max, step)	\
> +	[PFUZE100_ ## _name] = {	\
> +		.desc = {	\
> +			.name = #_name,	\
> +			.n_voltages = ((max) - (min)) / (step) + 1,	\
> +			.ops = &pfuze100_ldo_regulator_ops,	\
> +			.type = REGULATOR_VOLTAGE,	\
> +			.id = PFUZE100_ ## _name,	\
> +			.owner = THIS_MODULE,	\
> +			.min_uV = (min),	\
> +			.uV_step = (step),	\
> +			.vsel_reg = (base),	\
> +			.vsel_mask = 0xf,	\
> +			.enable_reg = (base),	\
> +			.enable_mask = 0x10,	\
> +		},	\
> +		.stby_reg = (base),	\
> +		.stby_mask = 0x20,	\
> +	}
> +
> +static struct pfuze_regulator pfuze100_regulators[] = {
> +	PFUZE100_SW_REG(SW1AB, PFUZE100_SW1ABVOL, 300000, 1875000, 25000),
> +	PFUZE100_SW_REG(SW1C, PFUZE100_SW1CVOL, 300000, 1875000, 25000),
> +	PFUZE100_SW_REG(SW2, PFUZE100_SW2VOL, 400000, 1975000, 25000),
> +	PFUZE100_SW_REG(SW3A, PFUZE100_SW3AVOL, 400000, 1975000, 25000),
> +	PFUZE100_SW_REG(SW3B, PFUZE100_SW3BVOL, 400000, 1975000, 25000),
> +	PFUZE100_SW_REG(SW4, PFUZE100_SW4VOL, 400000, 1975000, 25000),
> +	PFUZE100_SWB_REG(SWBST, PFUZE100_SWBSTCON1, 0x3 , pfuze100_swbst),
> +	PFUZE100_SWB_REG(VSNVS, PFUZE100_VSNVSVOL, 0x7, pfuze100_vsnvs),
> +	PFUZE100_FIXED_REG(VREFDDR, PFUZE100_VREFDDRCON, 750000),
> +	PFUZE100_VGEN_REG(VGEN1, PFUZE100_VGEN1VOL, 800000, 1550000, 50000),
> +	PFUZE100_VGEN_REG(VGEN2, PFUZE100_VGEN2VOL, 800000, 1550000, 50000),
> +	PFUZE100_VGEN_REG(VGEN3, PFUZE100_VGEN3VOL, 1800000, 3300000, 100000),
> +	PFUZE100_VGEN_REG(VGEN4, PFUZE100_VGEN4VOL, 1800000, 3300000, 100000),
> +	PFUZE100_VGEN_REG(VGEN5, PFUZE100_VGEN5VOL, 1800000, 3300000, 100000),
> +	PFUZE100_VGEN_REG(VGEN6, PFUZE100_VGEN6VOL, 1800000, 3300000, 100000),
> +};
> +
> +

One blank line is enough.

> +static int pfuze100_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
> +{
> +	struct pfuze_chip *pfuze100 = rdev_get_drvdata(rdev);
> +	int id = pfuze100->regulators_desc->desc.id;
> +	unsigned int val, ramp_bits, reg;
> +	int ret;
> +
> +	if (id < PFUZE100_SWBST) {
> +		if (id == PFUZE100_SW1AB)
> +			reg = PFUZE100_SW1ABVOL;
> +		else
> +			reg = PFUZE100_SW1CVOL + (id - PFUZE100_SW1C) * 7;
> +		regmap_read(pfuze100->regmap, reg, &val);
> +		if (val & 0x40)
> +			ramp_delay = 50000 / (4 * ramp_delay);
> +		else
> +			ramp_delay = 25000 / (2 * ramp_delay);
> +		if (id <= PFUZE100_SW1C)
> +			ramp_delay = 25000 / (2 * ramp_delay);
> +		ramp_bits = (ramp_delay >> 1) - (ramp_delay >> 3);
> +		ret = regmap_update_bits(pfuze100->regmap, reg + 4 , 0xc0,
> +				ramp_bits << 6);
> +		if (ret < 0)
> +			dev_err(pfuze100->dev, "SW ramp failed,err %d\nr", ret);
> +
> +	} else
> +		ret = -EACCES;

	} else {
		ret = -EACCES;
	}

> +	return ret;
> +}
> +
> +static struct regulator_ops pfuze100_ldo_regulator_ops = {
> +	.enable = regulator_enable_regmap,
> +	.disable = regulator_disable_regmap,
> +	.is_enabled = regulator_is_enabled_regmap,
> +	.list_voltage = regulator_list_voltage_linear,
> +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> +	.get_voltage_sel = regulator_get_voltage_sel_regmap,
> +};
> +
> +static struct regulator_ops pfuze100_fixed_regulator_ops = {
> +	.list_voltage = regulator_list_voltage_linear,
> +};
> +
> +static struct regulator_ops pfuze100_sw_regulator_ops = {
> +	.list_voltage = regulator_list_voltage_linear,
> +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> +	.get_voltage_sel = regulator_get_voltage_sel_regmap,
> +	.set_voltage_time_sel = regulator_set_voltage_time_sel,
> +	.set_ramp_delay = pfuze100_set_ramp_delay,
> +};
> +
> +static struct regulator_ops pfuze100_swb_regulator_ops = {
> +	.list_voltage = regulator_list_voltage_table,
> +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> +	.get_voltage_sel = regulator_get_voltage_sel_regmap,
> +
> +};
> +
> +#ifdef CONFIG_OF
> +
> +static int  pfuze_get_num_regulators_dt(struct device *dev)
             ^^

One space is enough.

> +{
> +	struct device_node *parent, *child;
> +	int num = 0;
> +
> +	of_node_get(dev->parent->of_node);
> +	parent = of_find_node_by_name(dev->parent->of_node, "regulators");
> +	if (!parent)
> +		return -ENODEV;
> +
> +	for_each_child_of_node(parent, child)
> +		num++;
> +
> +	return num;
> +}
> +
> +static struct pfuze_regulator_init_data *pfuze_parse_regulators_dt(
> +	struct pfuze_chip *chip, struct pfuze_regulator *regulators,
> +	int num_regulators)
> +{
> +	struct device *dev = chip->dev;
> +	struct pfuze_regulator_init_data *data, *p;
> +	struct device_node *parent, *child;
> +	int i;
> +
> +	of_node_get(dev->parent->of_node);
> +	parent = of_find_node_by_name(dev->parent->of_node, "regulators");
> +	if (!parent)
> +		return NULL;
> +
> +	data = devm_kzalloc(dev, sizeof(*data) * chip->num_regulators,
> +			    GFP_KERNEL);
> +	if (!data)
> +		return NULL;
> +	p = data;
> +	for_each_child_of_node(parent, child) {
> +		for (i = 0; i < num_regulators; i++) {
> +			if (!of_node_cmp(child->name,
> +					 regulators[i].desc.name)) {
> +				p->id = i;
> +				p->init_data = of_get_regulator_init_data(
> +							dev, child);
> +				p->node = child;
> +				p++;
> +				break;
> +			}
> +		}
> +	}
> +
> +	return data;
> +}
> +
> +#else
> +
> +static int pfuze_get_num_regulators_dt(struct device *dev)
> +{
> +		return -ENODEV;

One tab is enough.

> +
> +}
> +
> +static struct pfuze_regulator_init_data *pfuze_parse_regulators_dt(
> +	struct pfuze_chip *chip, struct pfuze_regulator *regulators,
> +	int num_regulators)
> +{
> +		return NULL;

Ditto

> +
> +}

Good.  I like the style not putting blank line.  But please have #else
and the according #ifdef be consistent with it.

> +#endif
> +
> +static int pfuze_identify(struct pfuze_chip *pfuze_chip)
> +{
> +	unsigned int value;
> +	int ret;

So the code is written without any blank line through the function.  I
think it will be much more readable if you have blank lines as I suggest
as below.

Blank line here.

> +	ret = regmap_read(pfuze_chip->regmap, PFUZE100_DEVICEID, &value);
> +	if (ret)
> +		return ret;

Blank line here.

> +	switch (value & 0x0f) {
> +	case 0x0:
> +		pfuze_chip->chip = PFUZE_ID_PFUZE100;
> +		break;
> +	default:
> +		pfuze_chip->chip = PFUZE_ID_INVALID;
> +		dev_warn(pfuze_chip->dev, "Illegal ID: %x\n", value);
> +		break;
> +	}

Blank line here.

> +	ret = regmap_read(pfuze_chip->regmap, PFUZE100_REVID, &value);
> +	if (ret)
> +		return ret;

Blank line here.

> +	dev_info(pfuze_chip->dev,
> +		 "ID: %d,Full lay: %x ,Metal lay: %x\n",

Space should be put after comma, so it should look like:

		 "ID: %d, Full lay: %x, Metal lay: %x\n",

> +		 pfuze_chip->chip, (value & 0xf0) >> 4, value & 0x0f);

Blank line here.

> +	ret = regmap_read(pfuze_chip->regmap, PFUZE100_FABID, &value);
> +	if (ret)
> +		return ret;

Blank line here.

> +	dev_info(pfuze_chip->dev, "FAB: %x ,FIN: %x\n",

Space after comma.

> +		 (value & 0xc) >> 2, value & 0x3);

Blank line here.

> +	return (pfuze_chip->chip == PFUZE_ID_INVALID) ? -ENODEV : 0;
> +}
> +
> +static struct regmap_config pfuze_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = PFUZE_NUMREGS,
> +	.cache_type = REGCACHE_RBTREE,
> +};
> +
> +static int pfuze100_regulator_probe(struct i2c_client *client,
> +				    const struct i2c_device_id *id)
> +{
> +	const struct of_device_id *of_id;
> +	struct i2c_driver *idrv = to_i2c_driver(client->dev.driver);
> +	struct pfuze_chip *pfuze_chip;
> +	struct pfuze_regulator_platform_data *pdata =
> +	    dev_get_platdata(&client->dev);
> +	struct pfuze_regulator_init_data *pfuze_data;
> +	struct regulator_config config = { };
> +	int i, ret;
> +	int num_regulators = 0;
> +
> +	of_id = of_match_device(pfuze_dt_ids, &client->dev);
> +	if (of_id)
> +		idrv->id_table = (const struct i2c_device_id *) of_id->data;

You do not use it at all from what I can see.  So drop these.

> +
> +	num_regulators = pfuze_get_num_regulators_dt(&client->dev);
> +	if (num_regulators <= 0 && pdata)
> +		num_regulators = pdata->num_regulators;
> +	if (num_regulators <= 0) {
> +		dev_err(&client->dev, "no platform data,please add it!\n");

Have a space after comma.

> +		ret = -EINVAL;
> +		return ret;
> +	}
> +
> +	pfuze_chip = devm_kzalloc(&client->dev, sizeof(*pfuze_chip) +
> +		       num_regulators * sizeof(pfuze_chip->regulators[0]),
> +			GFP_KERNEL);
> +	if (!pfuze_chip) {
> +		dev_err(&client->dev, "%s(): Memory allocation failed\n",
> +						__func__);

I'm not a fan of print memory allocation failure because error code
-ENOMEM is clear enough to tell that.  If you really want to have it,
at least drop __func__, since dev_err() already has some context.  And
other dev_err() in the function does not have it.

> +		return -ENOMEM;
> +	}
> +
> +	dev_set_drvdata(&client->dev, pfuze_chip);
> +	pfuze_chip->dev = &client->dev;
> +
> +	pfuze_chip->regmap = devm_regmap_init_i2c(client, &pfuze_regmap_config);
> +	if (IS_ERR(pfuze_chip->regmap)) {
> +		ret = PTR_ERR(pfuze_chip->regmap);
> +		dev_err(&client->dev,
> +			"%s(): regmap allocation failed with err %d\n",
> +			__func__, ret);
> +		return ret;
> +	}
> +
> +	ret = pfuze_identify(pfuze_chip);
> +	if (ret) {
> +		dev_err(&client->dev, "unrecognized pfuze chip ID!\n");
> +		return ret;
> +	}
> +
> +	pfuze_chip->num_regulators = num_regulators;
> +	pfuze_chip->regulators_desc = pfuze100_regulators;
> +	pfuze_data = pfuze_parse_regulators_dt(pfuze_chip, pfuze100_regulators,
> +					ARRAY_SIZE(pfuze100_regulators));
> +
> +	for (i = 0; i < num_regulators; i++) {
> +		struct regulator_init_data *init_data;
> +		struct regulator_desc *desc;
> +		struct device_node *node = NULL;
> +		int val;
> +		int id;
> +
> +		if (pfuze_data) {
> +			id = pfuze_data[i].id;
> +			init_data = pfuze_data[i].init_data;
> +			node = pfuze_data[i].node;
> +		} else {
> +			id = pdata->regulators[i].id;
> +			init_data = pdata->regulators[i].init_data;
> +		}
> +
> +		desc = &pfuze100_regulators[id].desc;
> +
> +		/* SW2~SW4 high bit check and modify the voltage value table */
> +		if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
> +			regmap_read(pfuze_chip->regmap, PFUZE100_SW2VOL +
> +					(i - PFUZE100_SW2) * 7, &val);
> +			if (val & 0x40) {
> +				pfuze100_regulators[id].desc.min_uV = 800000;
> +				pfuze100_regulators[id].desc.uV_step = 50000;
> +			}
> +		}
> +		config.dev = &client->dev;
> +		config.init_data = init_data;
> +		config.driver_data = pfuze_chip;
> +		config.of_node = node;
> +
> +		pfuze_chip->regulators[i] = regulator_register(desc, &config);
> +		if (IS_ERR(pfuze_chip->regulators[i])) {
> +			dev_err(&client->dev, "register regulator%s failed\n",
> +				pfuze100_regulators[i].desc.name);
> +			ret = PTR_ERR(pfuze_chip->regulators[i]);
> +			while (--i >= 0)
> +				regulator_unregister(pfuze_chip->regulators[i]);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int pfuze100_regulator_remove(struct i2c_client *client)
> +{
> +	int i;
> +	struct pfuze_chip *pfuze_chip = dev_get_drvdata(&client->dev);
> +
> +	for (i = 0; i < pfuze_chip->num_regulators; i++)
> +		regulator_unregister(pfuze_chip->regulators[i]);
> +	kfree(pfuze_chip);
> +
> +	return 0;
> +}
> +
> +static struct i2c_driver pfuze_driver = {
> +	.id_table = pfuze_device_id,
> +	.driver = {
> +		.name = "pfuze100-regulator",
> +		.owner = THIS_MODULE,
> +		.of_match_table = pfuze_dt_ids,
> +	},
> +	.probe = pfuze100_regulator_probe,
> +	.remove = pfuze100_regulator_remove,
> +};
> +

Drop this blank line.

> +module_i2c_driver(pfuze_driver);
> +
> +MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
> +MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
> +MODULE_ALIAS("pfuze100-regulator");
> diff --git a/include/linux/regulator/pfuze.h b/include/linux/regulator/pfuze.h
> new file mode 100644
> index 0000000..9791024
> --- /dev/null
> +++ b/include/linux/regulator/pfuze.h
> @@ -0,0 +1,49 @@
> +/*
> + * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
> + *
> + * 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 __LINUX_REG_PFUZE_H
> +#define __LINUX_REG_PFUZE_H

Remember to update it, if you agree to rename the header at all.

> +
> +#define PFUZE100_SW1AB		0
> +#define PFUZE100_SW1C		1
> +#define PFUZE100_SW2		2
> +#define PFUZE100_SW3A		3
> +#define PFUZE100_SW3B		4
> +#define PFUZE100_SW4		5
> +#define PFUZE100_SWBST		6
> +#define PFUZE100_VSNVS		7
> +#define PFUZE100_VREFDDR	8
> +#define PFUZE100_VGEN1		9
> +#define PFUZE100_VGEN2		10
> +#define PFUZE100_VGEN3		11
> +#define PFUZE100_VGEN4		12
> +#define PFUZE100_VGEN5		13
> +#define PFUZE100_VGEN6		14
> +
> +

Drop one bank line.

> +struct regulator_init_data;

Have a bank line.

> +struct pfuze_regulator_init_data {
> +	int id;
> +	struct regulator_init_data *init_data;
> +	struct device_node *node;
> +};

Have a bank line.

> +struct pfuze_regulator_platform_data {
> +	int num_regulators;
> +	struct pfuze_regulator_init_data *regulators;
> +};
> +
> +#endif

I generally recommend to have a /* macro used in the beginning */
after it.

Shawn

> -- 
> 1.7.5.4
> 
> 

Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Robin Gong]

Shawn, Thanks for your carefully review and I will correct it and send the patch again. some comments below:
> > +
> > +struct pfuze_regulator {
> > +	struct regulator_desc desc;
> > +	unsigned char stby_reg;
> > +	unsigned char stby_mask;
> > +};
> > +
> > +enum pfuze_id {
> > +	PFUZE_ID_PFUZE100,
> > +	PFUZE_ID_INVALID,
> > +};
> 
> Have a blank line here.
> 
> Is there any other valid ID other than PFUZE_ID_PFUZE100?  If not, we
> may not need this pfuze_id at all.  All the use of it is in
> pfuze_identify() for dev_info output.
> 
Yes, Now there is only one chip PFUZE100 here, but I'm told before there will be a series of pfuze family such as PFUZE101,PFUZE102..etc, so I keep the place for future.
> > +struct pfuze_chip {
> > +	struct pfuze_regulator *regulators_desc;
> > +	int num_regulators;
> > +	struct regmap *regmap;
> > +	struct device *dev;
> > +	enum pfuze_id chip;	/*chip type*/
> 
> /* comment */
> 
> Also I do not see much necessity of this member.  It's only used in
> function pfuze_identify(), from what I can see.
> 
Ditto
> > +	struct regulator_dev *regulators[];
> > +};
> > +
> > +static struct regulator_ops pfuze100_ldo_regulator_ops;
> > +static struct regulator_ops pfuze100_fixed_regulator_ops;
> > +static struct regulator_ops pfuze100_sw_regulator_ops;
> > +static struct regulator_ops pfuze100_swb_regulator_ops;
> > +
> > +static const int pfuze100_swbst[] = {
> > +	5000000, 5050000, 5100000, 5150000,
> > +};
> > +
> > +static const int pfuze100_vsnvs[] = {
> > +	1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
> > +};
> > +
> > +static const struct i2c_device_id pfuze_device_id[] = {
> > +	{.name = "pfuze100", .driver_data = PFUZE_ID_PFUZE100},
> 
> You do not use .driver_data in the driver at all, and can just drop it.
> 
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
> > +
> > +
> 
> Drop one blank line.
> 
> > +static const struct of_device_id pfuze_dt_ids[] = {
> > +	{ .compatible = "fsl,pfuze100", .data = (void *)PFUZE_ID_PFUZE100},
> 
> You do not use .data in the driver at all, and can just drop it.
>
good catch. .driver_data  of i2c_device_id and .data of of_device_id are two different ways to let driver know which chip used now by DTS or not. I should use them to know which chip used now ,although I can know by reading chipid register. 

Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

[Shawn Guo]

On Mon, Jul 15, 2013 at 02:40:39PM +0800, Robin Gong wrote:
> > > +static const struct of_device_id pfuze_dt_ids[] = {
> > > +	{ .compatible = "fsl,pfuze100", .data = (void *)PFUZE_ID_PFUZE100},
> > 
> > You do not use .data in the driver at all, and can just drop it.
> >
> good catch. .driver_data  of i2c_device_id and .data of of_device_id are two different ways to let driver know which chip used now by DTS or not. I should use them to know which chip used now ,although I can know by reading chipid register. 
> 

If you can figure out the chip ID from hardware, it should be used as
the preference over compatible and .driver_data.

Shawn