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Message-Id: <1394100057-32677-2-git-send-email-sachin.kamat@linaro.org>
Date:	Thu,  6 Mar 2014 15:30:56 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	lee.jones@...aro.org, sachin.kamat@...aro.org
Subject: [PATCH v3 Resend 2/3] regulator: Add support for S2MPA01 regulator

Add support for S2MPA01 voltage and current regulator.

Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
Acked-by: Mark Brown <broonie@...aro.org>
---
 drivers/regulator/Kconfig   |    7 +
 drivers/regulator/Makefile  |    1 +
 drivers/regulator/s2mpa01.c |  483 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 491 insertions(+)
 create mode 100644 drivers/regulator/s2mpa01.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 4ddfb6c065c7..5b08ea927870 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -425,6 +425,13 @@ config REGULATOR_RC5T583
 	  through regulator interface. The device supports multiple DCDC/LDO
 	  outputs which can be controlled by i2c communication.
 
+config REGULATOR_S2MPA01
+	tristate "Samsung S2MPA01 voltage regulator"
+	depends on MFD_SEC_CORE
+	help
+	 This driver controls Samsung S2MPA01 voltage output regulator
+	 via I2C bus. S2MPA01 has 10 Bucks and 26 LDO outputs.
+
 config REGULATOR_S2MPS11
 	tristate "Samsung S2MPS11 voltage regulator"
 	depends on MFD_SEC_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index c624dbcdcc76..2d14f7580304 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_REGULATOR_PBIAS) += pbias-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
+obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
diff --git a/drivers/regulator/s2mpa01.c b/drivers/regulator/s2mpa01.c
new file mode 100644
index 000000000000..6ac6e8205a05
--- /dev/null
+++ b/drivers/regulator/s2mpa01.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd
+ *		http://www.samsung.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.
+ *
+ */
+
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/samsung/core.h>
+#include <linux/mfd/samsung/s2mpa01.h>
+
+#define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)
+
+struct s2mpa01_info {
+	struct regulator_dev *rdev[S2MPA01_REGULATOR_MAX];
+
+	int ramp_delay24;
+	int ramp_delay3;
+	int ramp_delay5;
+	int ramp_delay16;
+	int ramp_delay7;
+	int ramp_delay8910;
+};
+
+static int get_ramp_delay(int ramp_delay)
+{
+	unsigned char cnt = 0;
+
+	ramp_delay /= 6250;
+
+	while (true) {
+		ramp_delay = ramp_delay >> 1;
+		if (ramp_delay == 0)
+			break;
+		cnt++;
+	}
+
+	if (cnt > 3)
+		cnt = 3;
+
+	return cnt;
+}
+
+static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
+				   unsigned int old_selector,
+				   unsigned int new_selector)
+{
+	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
+	unsigned int ramp_delay = 0;
+	int old_volt, new_volt;
+
+	switch (rdev->desc->id) {
+	case S2MPA01_BUCK2:
+	case S2MPA01_BUCK4:
+		ramp_delay = s2mpa01->ramp_delay24;
+		break;
+	case S2MPA01_BUCK3:
+		ramp_delay = s2mpa01->ramp_delay3;
+		break;
+	case S2MPA01_BUCK5:
+		ramp_delay = s2mpa01->ramp_delay5;
+		break;
+	case S2MPA01_BUCK1:
+	case S2MPA01_BUCK6:
+		ramp_delay = s2mpa01->ramp_delay16;
+		break;
+	case S2MPA01_BUCK7:
+		ramp_delay = s2mpa01->ramp_delay7;
+		break;
+	case S2MPA01_BUCK8:
+	case S2MPA01_BUCK9:
+	case S2MPA01_BUCK10:
+		ramp_delay = s2mpa01->ramp_delay8910;
+		break;
+	}
+
+	if (ramp_delay == 0)
+		ramp_delay = rdev->desc->ramp_delay;
+
+	old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
+	new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
+
+	return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
+}
+
+static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
+{
+	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
+	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
+	unsigned int ramp_enable = 1, enable_shift = 0;
+	int ret;
+
+	switch (rdev->desc->id) {
+	case S2MPA01_BUCK1:
+		enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
+		if (!ramp_delay) {
+			ramp_enable = 0;
+			break;
+		}
+
+		if (ramp_delay > s2mpa01->ramp_delay16)
+			s2mpa01->ramp_delay16 = ramp_delay;
+		else
+			ramp_delay = s2mpa01->ramp_delay16;
+
+		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
+		ramp_reg = S2MPA01_REG_RAMP1;
+		break;
+	case S2MPA01_BUCK2:
+		enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
+		if (!ramp_delay) {
+			ramp_enable = 0;
+			break;
+		}
+
+		if (ramp_delay > s2mpa01->ramp_delay24)
+			s2mpa01->ramp_delay24 = ramp_delay;
+		else
+			ramp_delay = s2mpa01->ramp_delay24;
+
+		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
+		ramp_reg = S2MPA01_REG_RAMP1;
+		break;
+	case S2MPA01_BUCK3:
+		enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
+		if (!ramp_delay) {
+			ramp_enable = 0;
+			break;
+		}
+
+		s2mpa01->ramp_delay3 = ramp_delay;
+		ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
+		ramp_reg = S2MPA01_REG_RAMP1;
+		break;
+	case S2MPA01_BUCK4:
+		enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
+		if (!ramp_delay) {
+			ramp_enable = 0;
+			break;
+		}
+
+		if (ramp_delay > s2mpa01->ramp_delay24)
+			s2mpa01->ramp_delay24 = ramp_delay;
+		else
+			ramp_delay = s2mpa01->ramp_delay24;
+
+		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
+		ramp_reg = S2MPA01_REG_RAMP1;
+		break;
+	case S2MPA01_BUCK5:
+		s2mpa01->ramp_delay5 = ramp_delay;
+		ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
+		break;
+	case S2MPA01_BUCK6:
+		if (ramp_delay > s2mpa01->ramp_delay16)
+			s2mpa01->ramp_delay16 = ramp_delay;
+		else
+			ramp_delay = s2mpa01->ramp_delay16;
+
+		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
+		break;
+	case S2MPA01_BUCK7:
+		s2mpa01->ramp_delay7 = ramp_delay;
+		ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
+		break;
+	case S2MPA01_BUCK8:
+	case S2MPA01_BUCK9:
+	case S2MPA01_BUCK10:
+		if (ramp_delay > s2mpa01->ramp_delay8910)
+			s2mpa01->ramp_delay8910 = ramp_delay;
+		else
+			ramp_delay = s2mpa01->ramp_delay8910;
+
+		ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
+		break;
+	default:
+		return 0;
+	}
+
+	if (!ramp_enable)
+		goto ramp_disable;
+
+	if (enable_shift) {
+		ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+					1 << enable_shift, 1 << enable_shift);
+		if (ret) {
+			dev_err(&rdev->dev, "failed to enable ramp rate\n");
+			return ret;
+		}
+	}
+
+	ramp_val = get_ramp_delay(ramp_delay);
+
+	return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
+				  ramp_val << ramp_shift);
+
+ramp_disable:
+	return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+				  1 << enable_shift, 0);
+}
+
+static struct regulator_ops s2mpa01_ldo_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+};
+
+static struct regulator_ops s2mpa01_buck_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= s2mpa01_regulator_set_voltage_time_sel,
+	.set_ramp_delay		= s2mpa01_set_ramp_delay,
+};
+
+#define regulator_desc_ldo1(num)	{		\
+	.name		= "LDO"#num,			\
+	.id		= S2MPA01_LDO##num,		\
+	.ops		= &s2mpa01_ldo_ops,		\
+	.type		= REGULATOR_VOLTAGE,		\
+	.owner		= THIS_MODULE,			\
+	.min_uV		= S2MPA01_LDO_MIN,		\
+	.uV_step	= S2MPA01_LDO_STEP1,		\
+	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
+	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
+	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK		\
+}
+#define regulator_desc_ldo2(num)	{		\
+	.name		= "LDO"#num,			\
+	.id		= S2MPA01_LDO##num,		\
+	.ops		= &s2mpa01_ldo_ops,		\
+	.type		= REGULATOR_VOLTAGE,		\
+	.owner		= THIS_MODULE,			\
+	.min_uV		= S2MPA01_LDO_MIN,		\
+	.uV_step	= S2MPA01_LDO_STEP2,		\
+	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
+	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
+	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK		\
+}
+
+#define regulator_desc_buck1_4(num)	{			\
+	.name		= "BUCK"#num,				\
+	.id		= S2MPA01_BUCK##num,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN1,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B1CTRL2 + (num - 1) * 2,	\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B1CTRL1 + (num - 1) * 2,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_buck5	{				\
+	.name		= "BUCK5",				\
+	.id		= S2MPA01_BUCK5,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN2,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B5CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B5CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_buck6_7(num)	{			\
+	.name		= "BUCK"#num,				\
+	.id		= S2MPA01_BUCK##num,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN1,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B6CTRL2 + (num - 6) * 2,	\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B6CTRL1 + (num - 6) * 2,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_buck8	{				\
+	.name		= "BUCK8",				\
+	.id		= S2MPA01_BUCK8,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN2,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B8CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B8CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_buck9	{				\
+	.name		= "BUCK9",				\
+	.id		= S2MPA01_BUCK9,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN4,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B9CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B9CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_buck10	{				\
+	.name		= "BUCK10",				\
+	.id		= S2MPA01_BUCK10,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN3,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B10CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B10CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+static struct regulator_desc regulators[] = {
+	regulator_desc_ldo2(1),
+	regulator_desc_ldo1(2),
+	regulator_desc_ldo1(3),
+	regulator_desc_ldo1(4),
+	regulator_desc_ldo1(5),
+	regulator_desc_ldo2(6),
+	regulator_desc_ldo1(7),
+	regulator_desc_ldo1(8),
+	regulator_desc_ldo1(9),
+	regulator_desc_ldo1(10),
+	regulator_desc_ldo2(11),
+	regulator_desc_ldo1(12),
+	regulator_desc_ldo1(13),
+	regulator_desc_ldo1(14),
+	regulator_desc_ldo1(15),
+	regulator_desc_ldo1(16),
+	regulator_desc_ldo1(17),
+	regulator_desc_ldo1(18),
+	regulator_desc_ldo1(19),
+	regulator_desc_ldo1(20),
+	regulator_desc_ldo1(21),
+	regulator_desc_ldo2(22),
+	regulator_desc_ldo2(23),
+	regulator_desc_ldo1(24),
+	regulator_desc_ldo1(25),
+	regulator_desc_ldo1(26),
+	regulator_desc_buck1_4(1),
+	regulator_desc_buck1_4(2),
+	regulator_desc_buck1_4(3),
+	regulator_desc_buck1_4(4),
+	regulator_desc_buck5,
+	regulator_desc_buck6_7(6),
+	regulator_desc_buck6_7(7),
+	regulator_desc_buck8,
+	regulator_desc_buck9,
+	regulator_desc_buck10,
+};
+
+static int s2mpa01_pmic_probe(struct platform_device *pdev)
+{
+	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
+	struct device_node *reg_np = NULL;
+	struct regulator_config config = { };
+	struct s2mpa01_info *s2mpa01;
+	int i, ret;
+
+	s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
+	if (!s2mpa01)
+		return -ENOMEM;
+
+	for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
+		rdata[i].name = regulators[i].name;
+
+	if (iodev->dev->of_node) {
+		reg_np = of_get_child_by_name(iodev->dev->of_node,
+							"regulators");
+			if (!reg_np) {
+				dev_err(&pdev->dev,
+					"could not find regulators sub-node\n");
+				return -EINVAL;
+			}
+
+		of_regulator_match(&pdev->dev, reg_np, rdata,
+						S2MPA01_REGULATOR_MAX);
+		of_node_put(reg_np);
+	}
+
+	platform_set_drvdata(pdev, s2mpa01);
+
+	config.dev = &pdev->dev;
+	config.regmap = iodev->regmap_pmic;
+	config.driver_data = s2mpa01;
+
+	for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
+		if (pdata)
+			config.init_data = pdata->regulators[i].initdata;
+		else
+			config.init_data = rdata[i].init_data;
+
+		if (reg_np)
+			config.of_node = rdata[i].of_node;
+
+		s2mpa01->rdev[i] = devm_regulator_register(&pdev->dev,
+						&regulators[i], &config);
+		if (IS_ERR(s2mpa01->rdev[i])) {
+			ret = PTR_ERR(s2mpa01->rdev[i]);
+			dev_err(&pdev->dev, "regulator init failed for %d\n",
+				i);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct platform_device_id s2mpa01_pmic_id[] = {
+	{ "s2mpa01-pmic", 0},
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
+
+static struct platform_driver s2mpa01_pmic_driver = {
+	.driver = {
+		.name = "s2mpa01-pmic",
+		.owner = THIS_MODULE,
+	},
+	.probe = s2mpa01_pmic_probe,
+	.id_table = s2mpa01_pmic_id,
+};
+
+module_platform_driver(s2mpa01_pmic_driver);
+
+/* Module information */
+MODULE_AUTHOR("Sangbeom Kim <sbkim73@...sung.com>");
+MODULE_AUTHOR("Sachin Kamat <sachin.kamat@...sung.com>");
+MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
+MODULE_LICENSE("GPL");
-- 
1.7.9.5

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