[RFC PATCH 2/3] regulator: AXP22x: add support for AXP221 regulators

From: Boris BREZILLON
Date: Thu May 15 2014 - 13:52:17 EST

The AXP221 PMIC provide 5 DC-DCs regulators and 14 LDO regulators.
This patch adds support for these regulators.

See http://linux-sunxi.org/AXP221#Regulators for detailed informations
on AXP221's regulators.

Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
---
drivers/regulator/Kconfig | 7 +
drivers/regulator/Makefile | 1 +
drivers/regulator/axp22x-regulator.c | 328 +++++++++++++++++++++++++++++++++++
3 files changed, 336 insertions(+)
create mode 100644 drivers/regulator/axp22x-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 8cc10e2..0e6da83 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -154,6 +154,13 @@ config REGULATOR_AXP20X
This driver provides support for the voltage regulators on the
AXP20X PMIC.

+config REGULATOR_AXP22X
+ tristate "X-POWERS AXP22X PMIC Regulators"
+ depends on MFD_AXP20X
+ help
+ This driver provides support for the voltage regulators on the
+ AXP22X 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 194ee45..3d63ad5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o
obj-$(CONFIG_REGULATOR_AS3722) += as3722-regulator.o
obj-$(CONFIG_REGULATOR_BCM590XX) += bcm590xx-regulator.o
obj-$(CONFIG_REGULATOR_AXP20X) += axp20x-regulator.o
+obj-$(CONFIG_REGULATOR_AXP22X) += axp22x-regulator.o
obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
obj-$(CONFIG_REGULATOR_DA9055) += da9055-regulator.o
diff --git a/drivers/regulator/axp22x-regulator.c b/drivers/regulator/axp22x-regulator.c
new file mode 100644
index 0000000..88abcac
--- /dev/null
+++ b/drivers/regulator/axp22x-regulator.c
@@ -0,0 +1,328 @@
+/*
+ * AXP22x regulators driver.
+ *
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
+ *
+ * Derived from drivers/regulator/axp20x-regulator.c:
+ * Author: Carlo Caione <carlo@xxxxxxxxxx>
+ *
+ * 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/axp22x.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define AXP22X_IO_ENABLED 0x04
+#define AXP22X_IO_DISABLED 0x03
+
+#define AXP22X_WORKMODE_DCDC2_MASK BIT(2)
+#define AXP22X_WORKMODE_DCDC3_MASK BIT(1)
+
+#define AXP22X_FREQ_DCDC_MASK 0x0f
+
+#define AXP22X_DESC_IO(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg, \
+ _emask, _enable_val, _disable_val) \
+ [AXP22X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AXP22X_##_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 = &axp22x_ops, \
+ }
+
+#define AXP22X_DESC(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg, \
+ _emask) \
+ [AXP22X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AXP22X_##_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 = &axp22x_ops, \
+ }
+
+#define AXP22X_DESC_FIXED(_id, _supply, _volt) \
+ [AXP22X_##_id] = { \
+ .name = #_id, \
+ .supply_name = (_supply), \
+ .type = REGULATOR_VOLTAGE, \
+ .id = AXP22X_##_id, \
+ .n_voltages = 1, \
+ .owner = THIS_MODULE, \
+ .min_uV = (_volt) * 1000, \
+ .ops = &axp22x_ops_fixed \
+ }
+
+static struct regulator_ops axp22x_ops_fixed = {
+ .list_voltage = regulator_list_voltage_linear,
+};
+
+static struct regulator_ops axp22x_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 axp22x_regulators[] = {
+ AXP22X_DESC(DCDC1, "vin1", 1600, 3400, 100, AXP22X_DCDC1_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL1, BIT(1)),
+ AXP22X_DESC(DCDC2, "vin2", 600, 1540, 20, AXP22X_DCDC2_V_OUT, 0x3f,
+ AXP22X_PWR_OUT_CTRL1, BIT(2)),
+ AXP22X_DESC(DCDC3, "vin3", 600, 1860, 20, AXP22X_DCDC3_V_OUT, 0x3f,
+ AXP22X_PWR_OUT_CTRL1, BIT(3)),
+ AXP22X_DESC(DCDC4, "vin4", 600, 1540, 20, AXP22X_DCDC4_V_OUT, 0x3f,
+ AXP22X_PWR_OUT_CTRL1, BIT(3)),
+ AXP22X_DESC(DCDC5, "vin5", 1000, 2550, 50, AXP22X_DCDC5_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL1, BIT(4)),
+ AXP22X_DESC(DC5LDO, "vin5", 700, 1400, 100, AXP22X_DC5LDO_V_OUT, 0x7,
+ AXP22X_PWR_OUT_CTRL1, BIT(0)),
+ AXP22X_DESC(ALDO1, "aldoin", 700, 3300, 100, AXP22X_ALDO1_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL1, BIT(6)),
+ AXP22X_DESC(ALDO2, "aldoin", 700, 3300, 100, AXP22X_ALDO2_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL1, BIT(7)),
+ AXP22X_DESC(ALDO3, "aldoin", 700, 3300, 100, AXP22X_ALDO3_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL3, BIT(7)),
+ AXP22X_DESC(DLDO1, "dldoin", 700, 3300, 100, AXP22X_DLDO1_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(3)),
+ AXP22X_DESC(DLDO2, "dldoin", 700, 3300, 100, AXP22X_DLDO2_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(4)),
+ AXP22X_DESC(DLDO3, "dldoin", 700, 3300, 100, AXP22X_DLDO3_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(5)),
+ AXP22X_DESC(DLDO4, "dldoin", 700, 3300, 100, AXP22X_DLDO4_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(6)),
+ AXP22X_DESC(ELDO1, "eldoin", 700, 3300, 100, AXP22X_ELDO1_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(0)),
+ AXP22X_DESC(ELDO2, "eldoin", 700, 3300, 100, AXP22X_ELDO2_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(1)),
+ AXP22X_DESC(ELDO3, "eldoin", 700, 3300, 100, AXP22X_ELDO3_V_OUT, 0x1f,
+ AXP22X_PWR_OUT_CTRL2, BIT(2)),
+ AXP22X_DESC_IO(LDO_IO0, "ldoioin", 1800, 3300, 100, AXP22X_LDO_IO0_V_OUT,
+ 0x1f, AXP22X_GPIO0_CTRL, 0x07, AXP22X_IO_ENABLED,
+ AXP22X_IO_DISABLED),
+ AXP22X_DESC_IO(LDO_IO1, "ldoioin", 1800, 3300, 100, AXP22X_LDO_IO1_V_OUT,
+ 0x1f, AXP22X_GPIO1_CTRL, 0x07, AXP22X_IO_ENABLED,
+ AXP22X_IO_DISABLED),
+ AXP22X_DESC_FIXED(RTC_LDO, "rtcldoin", 3000),
+};
+
+#define AXP_MATCH(_name, _id) \
+ [AXP22X_##_id] = { \
+ .name = #_name, \
+ .driver_data = (void *) &axp22x_regulators[AXP22X_##_id], \
+ }
+
+static struct of_regulator_match axp22x_matches[] = {
+ AXP_MATCH(dcdc1, DCDC1),
+ AXP_MATCH(dcdc2, DCDC2),
+ AXP_MATCH(dcdc3, DCDC3),
+ AXP_MATCH(dcdc4, DCDC4),
+ AXP_MATCH(dcdc5, DCDC5),
+ AXP_MATCH(dc5ldo, DC5LDO),
+ AXP_MATCH(aldo1, ALDO1),
+ AXP_MATCH(aldo2, ALDO2),
+ AXP_MATCH(aldo3, ALDO3),
+ AXP_MATCH(dldo1, DLDO1),
+ AXP_MATCH(dldo2, DLDO2),
+ AXP_MATCH(dldo3, DLDO3),
+ AXP_MATCH(dldo4, DLDO4),
+ AXP_MATCH(eldo1, ELDO1),
+ AXP_MATCH(eldo2, ELDO2),
+ AXP_MATCH(eldo3, ELDO3),
+ AXP_MATCH(ldo_io0, LDO_IO0),
+ AXP_MATCH(ldo_io1, LDO_IO1),
+ AXP_MATCH(rtc_ldo, RTC_LDO),
+};
+
+static int axp22x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
+{
+ struct axp22x_dev *axp22x = 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(axp22x->regmap, AXP22X_DCDC_FREQ,
+ AXP22X_FREQ_DCDC_MASK, dcdcfreq);
+}
+
+static int axp22x_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, axp22x_matches,
+ ARRAY_SIZE(axp22x_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 = axp22x_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 axp22x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
+{
+ unsigned int mask = BIT(id);
+
+ if (workmode)
+ workmode = mask;
+
+ return regmap_update_bits(rdev->regmap, AXP22X_DCDC_MODE, mask, workmode);
+}
+
+static int axp22x_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev;
+ struct axp22x_dev *axp22x = dev_get_drvdata(pdev->dev.parent);
+ struct regulator_config config = { };
+ struct regulator_init_data *init_data;
+ bool registered[AXP22X_REG_ID_MAX];
+ int nregistered = 0;
+ int prev_nregistered = -1;
+ int ret, i;
+ u32 workmode;
+
+ ret = axp22x_regulator_parse_dt(pdev);
+ if (ret)
+ return ret;
+
+ memset(&registered, 0, sizeof(registered));
+
+ /*
+ * Some regulators might take their power supply from other regulators
+ * defined by the same PMIC.
+ *
+ * Retry regulators registration until all regulators are registered
+ * or the last iteration didn't manage to register any new regulator
+ * (which means there's an external dependency missing and we can thus
+ * return EPROBE_DEFER).
+ */
+ while (nregistered < AXP22X_REG_ID_MAX &&
+ prev_nregistered < nregistered) {
+
+ prev_nregistered = nregistered;
+
+ for (i = 0; i < AXP22X_REG_ID_MAX; i++) {
+ if (registered[i])
+ continue;
+
+ init_data = axp22x_matches[i].init_data;
+
+ config.dev = &pdev->dev;
+ config.init_data = init_data;
+ config.regmap = axp22x->regmap;
+ config.of_node = axp22x_matches[i].of_node;
+
+ rdev = devm_regulator_register(&pdev->dev,
+ &axp22x_regulators[i],
+ &config);
+ if (IS_ERR(rdev)) {
+ if (PTR_ERR(rdev) == -EPROBE_DEFER)
+ continue;
+
+ dev_err(&pdev->dev, "Failed to register %s\n",
+ axp22x_regulators[i].name);
+
+ return PTR_ERR(rdev);
+ }
+
+ nregistered++;
+
+ ret = of_property_read_u32(axp22x_matches[i].of_node,
+ "x-powers,dcdc-workmode",
+ &workmode);
+ if (!ret &&
+ axp22x_set_dcdc_workmode(rdev, i, workmode))
+ dev_err(&pdev->dev,
+ "Failed to set workmode on %s\n",
+ axp22x_regulators[i].name);
+
+ registered[i] = true;
+ nregistered++;
+ }
+ }
+
+ if (nregistered < AXP22X_REG_ID_MAX)
+ return -EPROBE_DEFER;
+
+ return 0;
+}
+
+static struct platform_driver axp22x_regulator_driver = {
+ .probe = axp22x_regulator_probe,
+ .driver = {
+ .name = "axp22x-regulator",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(axp22x_regulator_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Carlo Caione <carlo@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Regulator Driver for AXP22X PMIC");
--
1.8.3.2

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