--- /dev/null
+From c3af279a9031b3375d3e5a684619c1adbbe30da9 Mon Sep 17 00:00:00 2001
+From: Carlo Caione <carlo@caione.org>
+Date: Sat, 1 Mar 2014 17:45:51 +0100
+Subject: [PATCH] regulator: AXP20x: Add support for regulators subsystem
+
+AXP202 and AXP209 come with two synchronous step-down DC-DCs and five
+LDOs. This patch introduces basic support for those regulators.
+
+Signed-off-by: Carlo Caione <carlo@caione.org>
+---
+ arch/arm/configs/sunxi_defconfig | 1 +
+ drivers/regulator/Kconfig | 7 +
+ drivers/regulator/Makefile | 1 +
+ drivers/regulator/axp20x-regulator.c | 349 +++++++++++++++++++++++++++++++++++
+ 4 files changed, 358 insertions(+)
+ create mode 100644 drivers/regulator/axp20x-regulator.c
+
+diff --git a/arch/arm/configs/sunxi_defconfig b/arch/arm/configs/sunxi_defconfig
+index 3ed7023..6e305da 100644
+--- a/arch/arm/configs/sunxi_defconfig
++++ b/arch/arm/configs/sunxi_defconfig
+@@ -72,3 +72,4 @@ CONFIG_NFS_FS=y
+ CONFIG_ROOT_NFS=y
+ CONFIG_NLS=y
+ CONFIG_PRINTK_TIME=y
++CONFIG_REGULATOR_AXP20X=y
+diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
+index 6a79328..9f3bc48 100644
+--- a/drivers/regulator/Kconfig
++++ b/drivers/regulator/Kconfig
+@@ -139,6 +139,13 @@ config REGULATOR_AS3722
+ AS3722 PMIC. This will enable support for all the software
+ controllable DCDC/LDO regulators.
+
++config REGULATOR_AXP20X
++ tristate "X-POWERS AXP20X PMIC Regulators"
++ depends on MFD_AXP20X
++ help
++ This driver provides support for the voltage regulators on the
++ AXP20X PMIC.
++
+ config REGULATOR_DA903X
+ tristate "Dialog Semiconductor DA9030/DA9034 regulators"
+ depends on PMIC_DA903X
+diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
+index 979f9dd..1dd084a 100644
+--- a/drivers/regulator/Makefile
++++ b/drivers/regulator/Makefile
+@@ -20,6 +20,7 @@ obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
+ obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.o
+ obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o
+ obj-$(CONFIG_REGULATOR_AS3722) += as3722-regulator.o
++obj-$(CONFIG_REGULATOR_AXP20X) += axp20x-regulator.o
+ obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
+ obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
+ obj-$(CONFIG_REGULATOR_DA9055) += da9055-regulator.o
+diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c
+new file mode 100644
+index 0000000..9072f2f
+--- /dev/null
++++ b/drivers/regulator/axp20x-regulator.c
+@@ -0,0 +1,349 @@
++/*
++ * axp20x regulators driver.
++ *
++ * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
++ *
++ * This file is subject to the terms and conditions of the GNU General
++ * Public License. See the file "COPYING" in the main directory of this
++ * archive for more details.
++ *
++ * 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.
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/err.h>
++#include <linux/platform_device.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/regulator/driver.h>
++#include <linux/regulator/of_regulator.h>
++#include <linux/mfd/axp20x.h>
++#include <linux/regmap.h>
++
++#define AXP20X_IO_ENABLED (0x03)
++
++#define AXP20X_WORKMODE_DCDC2_MASK BIT(2)
++#define AXP20X_WORKMODE_DCDC3_MASK BIT(1)
++
++#define AXP20X_FREQ_DCDC_MASK (0x0f)
++
++struct axp20x_regulators {
++ struct regulator_desc rdesc[AXP20X_REG_ID_MAX];
++ struct regulator_dev *rdev[AXP20X_REG_ID_MAX];
++ struct axp20x_dev *axp20x;
++};
++
++#define AXP20X_DESC(_id, _min, _max, _step, _vreg, _vmask, _ereg, _emask) \
++ [AXP20X_##_id] = { \
++ .name = #_id, \
++ .type = REGULATOR_VOLTAGE, \
++ .id = AXP20X_##_id, \
++ .n_voltages = (((_max) - (_min)) / (_step) + 1), \
++ .owner = THIS_MODULE, \
++ .min_uV = (_min) * 1000, \
++ .uV_step = (_step) * 1000, \
++ .vsel_reg = (_vreg), \
++ .vsel_mask = (_vmask), \
++ .enable_reg = (_ereg), \
++ .enable_mask = (_emask), \
++ .ops = &axp20x_ops, \
++ }
++
++#define AXP20X_DESC_IO(_id, _min, _max, _step, _vreg, _vmask, _ereg, _emask) \
++ [AXP20X_##_id] = { \
++ .name = #_id, \
++ .type = REGULATOR_VOLTAGE, \
++ .id = AXP20X_##_id, \
++ .n_voltages = (((_max) - (_min)) / (_step) + 1), \
++ .owner = THIS_MODULE, \
++ .min_uV = (_min) * 1000, \
++ .uV_step = (_step) * 1000, \
++ .vsel_reg = (_vreg), \
++ .vsel_mask = (_vmask), \
++ .enable_reg = (_ereg), \
++ .enable_mask = (_emask), \
++ .ops = &axp20x_ops_io, \
++ }
++
++#define AXP20X_DESC_FIXED(_id, _volt) \
++ [AXP20X_##_id] = { \
++ .name = #_id, \
++ .type = REGULATOR_VOLTAGE, \
++ .id = AXP20X_##_id, \
++ .n_voltages = 1, \
++ .owner = THIS_MODULE, \
++ .min_uV = (_volt) * 1000, \
++ .ops = &axp20x_ops, \
++ }
++
++#define AXP20X_DESC_TABLE(_id, _table, _vreg, _vmask, _ereg, _emask) \
++ [AXP20X_##_id] = { \
++ .name = #_id, \
++ .type = REGULATOR_VOLTAGE, \
++ .id = AXP20X_##_id, \
++ .n_voltages = ARRAY_SIZE(_table), \
++ .owner = THIS_MODULE, \
++ .vsel_reg = (_vreg), \
++ .vsel_mask = (_vmask), \
++ .enable_reg = (_ereg), \
++ .enable_mask = (_emask), \
++ .volt_table = (_table), \
++ .ops = &axp20x_ops_table, \
++ }
++
++static int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000, 1700000,
++ 1800000, 1900000, 2000000, 2500000, 2700000, 2800000,
++ 3000000, 3100000, 3200000, 3300000 };
++
++static int axp20x_set_suspend_voltage(struct regulator_dev *rdev, int uV)
++{
++ return regulator_set_voltage_sel_regmap(rdev, 0);
++}
++
++static int axp20x_io_enable_regmap(struct regulator_dev *rdev)
++{
++ return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
++ rdev->desc->enable_mask, AXP20X_IO_ENABLED);
++}
++
++static int axp109_io_is_enabled_regmap(struct regulator_dev *rdev)
++{
++ unsigned int val;
++ int ret;
++
++ ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
++ if (ret != 0)
++ return ret;
++
++ val &= rdev->desc->enable_mask;
++ return (val == AXP20X_IO_ENABLED);
++}
++
++static struct regulator_ops axp20x_ops_table = {
++ .set_voltage_sel = regulator_set_voltage_sel_regmap,
++ .get_voltage_sel = regulator_get_voltage_sel_regmap,
++ .list_voltage = regulator_list_voltage_table,
++ .enable = regulator_enable_regmap,
++ .disable = regulator_disable_regmap,
++ .is_enabled = regulator_is_enabled_regmap,
++ .set_suspend_enable = regulator_enable_regmap,
++ .set_suspend_disable = regulator_disable_regmap,
++ .set_suspend_voltage = axp20x_set_suspend_voltage,
++};
++
++
++static struct regulator_ops axp20x_ops = {
++ .set_voltage_sel = regulator_set_voltage_sel_regmap,
++ .get_voltage_sel = regulator_get_voltage_sel_regmap,
++ .list_voltage = regulator_list_voltage_linear,
++ .enable = regulator_enable_regmap,
++ .disable = regulator_disable_regmap,
++ .is_enabled = regulator_is_enabled_regmap,
++ .set_suspend_enable = regulator_enable_regmap,
++ .set_suspend_disable = regulator_disable_regmap,
++ .set_suspend_voltage = axp20x_set_suspend_voltage,
++};
++
++static struct regulator_ops axp20x_ops_io = {
++ .set_voltage_sel = regulator_set_voltage_sel_regmap,
++ .get_voltage_sel = regulator_get_voltage_sel_regmap,
++ .list_voltage = regulator_list_voltage_linear,
++ .enable = axp20x_io_enable_regmap,
++ .disable = regulator_disable_regmap,
++ .is_enabled = axp109_io_is_enabled_regmap,
++ .set_suspend_enable = regulator_enable_regmap,
++ .set_suspend_disable = regulator_disable_regmap,
++ .set_suspend_voltage = axp20x_set_suspend_voltage,
++};
++
++static struct regulator_desc axp20x_regulators[] = {
++ AXP20X_DESC(DCDC2, 700, 2275, 25, AXP20X_DCDC2_V_OUT, 0x3f,
++ AXP20X_PWR_OUT_CTRL, 0x10),
++ AXP20X_DESC(DCDC3, 700, 3500, 25, AXP20X_DCDC3_V_OUT, 0x7f,
++ AXP20X_PWR_OUT_CTRL, 0x02),
++ AXP20X_DESC_FIXED(LDO1, 1300),
++ AXP20X_DESC(LDO2, 1800, 3300, 100, AXP20X_LDO24_V_OUT, 0xf0,
++ AXP20X_PWR_OUT_CTRL, 0x04),
++ AXP20X_DESC(LDO3, 700, 3500, 25, AXP20X_LDO3_V_OUT, 0x7f,
++ AXP20X_PWR_OUT_CTRL, 0x40),
++ AXP20X_DESC_TABLE(LDO4, axp20x_ldo4_data, AXP20X_LDO24_V_OUT, 0x0f,
++ AXP20X_PWR_OUT_CTRL, 0x08),
++ AXP20X_DESC_IO(LDO5, 1800, 3300, 100, AXP20X_LDO5_V_OUT, 0xf0,
++ AXP20X_GPIO0_CTRL, 0x07),
++};
++
++#define AXP_MATCH(_name, _id) \
++ [AXP20X_##_id] = { \
++ .name = #_name, \
++ .driver_data = (void *) &axp20x_regulators[AXP20X_##_id], \
++ }
++
++static struct of_regulator_match axp20x_matches[] = {
++ AXP_MATCH(dcdc2, DCDC2),
++ AXP_MATCH(dcdc3, DCDC3),
++ AXP_MATCH(ldo1, LDO1),
++ AXP_MATCH(ldo2, LDO2),
++ AXP_MATCH(ldo3, LDO3),
++ AXP_MATCH(ldo4, LDO4),
++ AXP_MATCH(ldo5, LDO5),
++};
++
++static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
++{
++ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
++
++ if (dcdcfreq < 750)
++ dcdcfreq = 750;
++
++ if (dcdcfreq > 1875)
++ dcdcfreq = 1875;
++
++ dcdcfreq = (dcdcfreq - 750) / 75;
++
++ return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,
++ AXP20X_FREQ_DCDC_MASK, dcdcfreq);
++}
++
++static int axp20x_regulator_parse_dt(struct platform_device *pdev)
++{
++ struct device_node *np, *regulators;
++ int ret;
++ u32 dcdcfreq;
++
++ np = of_node_get(pdev->dev.parent->of_node);
++ if (!np)
++ return 0;
++
++ regulators = of_find_node_by_name(np, "regulators");
++ if (!regulators) {
++ dev_err(&pdev->dev, "regulators node not found\n");
++ return -EINVAL;
++ }
++
++ ret = of_regulator_match(&pdev->dev, regulators, axp20x_matches,
++ ARRAY_SIZE(axp20x_matches));
++ if (ret < 0) {
++ dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
++ ret);
++ return ret;
++ }
++
++ dcdcfreq = 0x08;
++ of_property_read_u32(regulators, "dcdc-freq", &dcdcfreq);
++ ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);
++ if (ret < 0) {
++ dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);
++ return ret;
++ }
++
++ of_node_put(regulators);
++
++ return 0;
++}
++
++static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
++{
++ unsigned int mask = AXP20X_WORKMODE_DCDC2_MASK;
++
++ if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))
++ return -EINVAL;
++
++ if (id == AXP20X_DCDC3)
++ mask = AXP20X_WORKMODE_DCDC3_MASK;
++
++ return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
++}
++
++static int axp20x_regulator_probe(struct platform_device *pdev)
++{
++ struct axp20x_regulators *pmic;
++ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
++ struct regulator_config config = { };
++ struct regulator_init_data *init_data;
++ int ret, i;
++ u32 workmode;
++
++ ret = axp20x_regulator_parse_dt(pdev);
++ if (ret)
++ return ret;
++
++ pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
++ if (!pmic) {
++ dev_err(&pdev->dev, "Failed to alloc pmic\n");
++ return -ENOMEM;
++ }
++
++ pmic->axp20x = axp20x;
++ memcpy(pmic->rdesc, axp20x_regulators, sizeof(pmic->rdesc));
++ platform_set_drvdata(pdev, pmic);
++
++ for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
++ init_data = axp20x_matches[i].init_data;
++ if (!init_data)
++ continue;
++
++ config.dev = &pdev->dev;
++ config.init_data = init_data;
++ config.driver_data = pmic;
++ config.regmap = axp20x->regmap;
++ config.of_node = axp20x_matches[i].of_node;
++
++ pmic->rdev[i] = regulator_register(&pmic->rdesc[i], &config);
++ if (IS_ERR(pmic->rdev[i])) {
++ ret = PTR_ERR(pmic->rdev[i]);
++ dev_err(&pdev->dev, "Failed to register %s\n",
++ pmic->rdesc[i].name);
++
++ while (--i >= 0)
++ regulator_unregister(pmic->rdev[i]);
++
++ return ret;
++ }
++
++ ret = of_property_read_u32(axp20x_matches[i].of_node, "dcdc-workmode",
++ &workmode);
++ if (!ret) {
++ ret = axp20x_set_dcdc_workmode(pmic->rdev[i], i, workmode);
++ if (ret)
++ dev_err(&pdev->dev, "Failed to set workmode on %s\n",
++ pmic->rdesc[i].name);
++ }
++ }
++
++ return 0;
++}
++
++static int axp20x_regulator_remove(struct platform_device *pdev)
++{
++ struct axp20x_regulators *pmic = platform_get_drvdata(pdev);
++ int i;
++
++ for (i = 0; i < AXP20X_REG_ID_MAX; i++)
++ regulator_unregister(pmic->rdev[i]);
++
++ return 0;
++}
++
++static struct platform_driver axp20x_regulator_driver = {
++ .probe = axp20x_regulator_probe,
++ .remove = axp20x_regulator_remove,
++ .driver = {
++ .name = "axp20x-regulator",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init axp20x_regulator_init(void)
++{
++ return platform_driver_register(&axp20x_regulator_driver);
++}
++
++subsys_initcall(axp20x_regulator_init);
++
++MODULE_LICENSE("GPL v2");
++MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
++MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");
+--
+2.0.3
+
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