[PATCH v4 6/9] regulator: AXP20x: Add support for regulators subsystem

Carlo Caione
2014-04-11T09:38:10Z

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>
---
drivers/regulator/Kconfig | 7 +
drivers/regulator/Makefile | 1 +
drivers/regulator/axp20x-regulator.c | 285 +++++++++++++++++++++++++++++++++++
3 files changed, 293 insertions(+)
create mode 100644 drivers/regulator/axp20x-regulator.c

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..78a29e6
--- /dev/null
+++ b/drivers/regulator/axp20x-regulator.c
@@ -0,0 +1,285 @@
+/*
+ * 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/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define AXP20X_IO_ENABLED 0x03
+#define AXP20X_IO_DISABLED 0x07
+
+#define AXP20X_WORKMODE_DCDC2_MASK BIT(2)
+#define AXP20X_WORKMODE_DCDC3_MASK BIT(1)
+
+#define AXP20X_FREQ_DCDC_MASK 0x0f
+
+#define AXP20X_DESC_IO(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg, \
+ _emask, _enable_val, _disable_val) \
+ [AXP20X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .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), \
+ .enable_val = (_enable_val), \
+ .disable_val = (_disable_val), \
+ .ops = &axp20x_ops, \
+ }
+
+#define AXP20X_DESC(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg, \
+ _emask) \
+ [AXP20X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .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_FIXED(_id, _supply, _volt) \
+ [AXP20X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AXP20X_##_id, \
+ .n_voltages = 1, \
+ .owner = THIS_MODULE, \
+ .min_uV = (_volt) * 1000, \
+ .ops = &axp20x_ops_fixed \
+ }
+
+#define AXP20X_DESC_TABLE(_id, _supply, _table, _vreg, _vmask, _ereg, _emask) \
+ [AXP20X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .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 const int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000,
+ 1700000, 1800000, 1900000, 2000000, 2500000,
+ 2700000, 2800000, 3000000, 3100000, 3200000,
+ 3300000 };
+
+static struct regulator_ops axp20x_ops_fixed = {
+ .list_voltage = regulator_list_voltage_linear,
+};
+
+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,
+};
+
+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,
+};
+
+static const struct regulator_desc axp20x_regulators[] = {
+ AXP20X_DESC(DCDC2, "vin2", 700, 2275, 25, AXP20X_DCDC2_V_OUT, 0x3f,
+ AXP20X_PWR_OUT_CTRL, 0x10),
+ AXP20X_DESC(DCDC3, "vin3", 700, 3500, 25, AXP20X_DCDC3_V_OUT, 0x7f,
+ AXP20X_PWR_OUT_CTRL, 0x02),
+ AXP20X_DESC_FIXED(LDO1, "acin", 1300),
+ AXP20X_DESC(LDO2, "ldo24in", 1800, 3300, 100, AXP20X_LDO24_V_OUT, 0xf0,
+ AXP20X_PWR_OUT_CTRL, 0x04),
+ AXP20X_DESC(LDO3, "ldo3in", 700, 3500, 25, AXP20X_LDO3_V_OUT, 0x7f,
+ AXP20X_PWR_OUT_CTRL, 0x40),
+ AXP20X_DESC_TABLE(LDO4, "ldo24in", axp20x_ldo4_data, AXP20X_LDO24_V_OUT, 0x0f,
+ AXP20X_PWR_OUT_CTRL, 0x08),
+ AXP20X_DESC_IO(LDO5, "ldo5in", 1800, 3300, 100, AXP20X_LDO5_V_OUT, 0xf0,
+ AXP20X_GPIO0_CTRL, 0x07, AXP20X_IO_ENABLED,
+ AXP20X_IO_DISABLED),
+};
+
+#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;
+ dev_warn(&pdev->dev, "DCDC frequency too low. Set to 750kHz\n");
+ }
+
+ if (dcdcfreq > 1875) {
+ dcdcfreq = 1875;
+ dev_warn(&pdev->dev, "DCDC frequency too high. Set to 1875kHz\n");
+ }
+
+ 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_warn(&pdev->dev, "regulators node not found\n");
+ } else {
+ 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 = 1500;
+ of_property_read_u32(regulators, "x-powers,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;
+
+ workmode <<= ffs(mask) - 1;
+
+ return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
+}
+
+static int axp20x_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev;
+ 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;
+
+ for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
+ init_data = axp20x_matches[i].init_data;
+
+ config.dev = &pdev->dev;
+ config.init_data = init_data;
+ config.regmap = axp20x->regmap;
+ config.of_node = axp20x_matches[i].of_node;
+
+ rdev = devm_regulator_register(&pdev->dev, &axp20x_regulators[i],
+ &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "Failed to register %s\n",
+ axp20x_regulators[i].name);
+
+ return PTR_ERR(rdev);
+ }
+
+ ret = of_property_read_u32(axp20x_matches[i].of_node, "x-powers,dcdc-workmode",
+ &workmode);
+ if (!ret) {
+ if (axp20x_set_dcdc_workmode(rdev, i, workmode))
+ dev_err(&pdev->dev, "Failed to set workmode on %s\n",
+ axp20x_regulators[i].name);
+ }
+ }
+
+ return 0;
+}
+
+static struct platform_driver axp20x_regulator_driver = {
+ .probe = axp20x_regulator_probe,
+ .driver = {
+ .name = "axp20x-regulator",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(axp20x_regulator_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
+MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");
--
1.8.3.2