[PATCH v2 9/9] regulator: add LM363X driver

From: Milo Kim
Date: Thu Nov 26 2015 - 01:59:37 EST

LM363X regulator driver supports LM3631 and LM3632.
LM3631 has 5 regulators. LM3632 provides 3 regulators.
One boost output and LDOs are used for the display module.
Boost voltage is configurable but always on.
Supported operations for LDOs are enabled/disabled and voltage change.

Two LDOs of LM3632 can be controlled by external pins.
Those are configured through the DT properties.

Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
Cc: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-leds@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Milo Kim <milo.kim@xxxxxx>
---
drivers/regulator/Kconfig | 9 +
drivers/regulator/Makefile | 1 +
drivers/regulator/lm363x-regulator.c | 309 +++++++++++++++++++++++++++++++++++
3 files changed, 319 insertions(+)
create mode 100644 drivers/regulator/lm363x-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 3e028d9..971ebfa 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -274,6 +274,15 @@ config REGULATOR_ISL6271A
help
This driver supports ISL6271A voltage regulator chip.

+config REGULATOR_LM363X
+ tristate "TI LM363X voltage regulators"
+ depends on MFD_TI_LMU
+ help
+ This driver supports LM3631 and LM3632 voltage regulators for
+ the LCD bias.
+ One boost output voltage is configurable and always on.
+ Other LDOs are used for the display module.
+
config REGULATOR_LP3971
tristate "National Semiconductors LP3971 PMIC regulator driver"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 5a963d9..21a3e67 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_REGULATOR_GPIO) += gpio-regulator.o
obj-$(CONFIG_REGULATOR_HI6421) += hi6421-regulator.o
obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
obj-$(CONFIG_REGULATOR_ISL9305) += isl9305.o
+obj-$(CONFIG_REGULATOR_LM363X) += lm363x-regulator.o
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o
diff --git a/drivers/regulator/lm363x-regulator.c b/drivers/regulator/lm363x-regulator.c
new file mode 100644
index 0000000..e1b683e
--- /dev/null
+++ b/drivers/regulator/lm363x-regulator.c
@@ -0,0 +1,309 @@
+/*
+ * TI LM363X Regulator Driver
+ *
+ * Copyright 2015 Texas Instruments
+ *
+ * Author: Milo Kim <milo.kim@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/mfd/ti-lmu.h>
+#include <linux/mfd/ti-lmu-register.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/slab.h>
+
+/* LM3631 */
+#define LM3631_BOOST_VSEL_MAX 0x25
+#define LM3631_LDO_VSEL_MAX 0x28
+#define LM3631_CONT_VSEL_MAX 0x03
+#define LM3631_VBOOST_MIN 4500000
+#define LM3631_VCONT_MIN 1800000
+#define LM3631_VLDO_MIN 4000000
+#define ENABLE_TIME_USEC 1000
+
+/* LM3632 */
+#define LM3632_BOOST_VSEL_MAX 0x26
+#define LM3632_LDO_VSEL_MAX 0x29
+#define LM3632_VBOOST_MIN 4500000
+#define LM3632_VLDO_MIN 4000000
+
+/* Common */
+#define LM363X_STEP_50mV 50000
+#define LM363X_STEP_500mV 500000
+
+struct lm363x_regulator {
+ struct regmap *regmap;
+ struct regulator_dev *regulator;
+};
+
+const int ldo_cont_enable_time[] = {
+ 0, 2000, 5000, 10000, 20000, 50000, 100000, 200000,
+};
+
+static int lm363x_regulator_enable_time(struct regulator_dev *rdev)
+{
+ struct lm363x_regulator *lm363x_regulator = rdev_get_drvdata(rdev);
+ enum lm363x_regulator_id id = rdev_get_id(rdev);
+ u8 val, addr, mask;
+
+ switch (id) {
+ case LM3631_LDO_CONT:
+ addr = LM3631_REG_ENTIME_VCONT;
+ mask = LM3631_ENTIME_CONT_MASK;
+ break;
+ case LM3631_LDO_OREF:
+ addr = LM3631_REG_ENTIME_VOREF;
+ mask = LM3631_ENTIME_MASK;
+ break;
+ case LM3631_LDO_POS:
+ addr = LM3631_REG_ENTIME_VPOS;
+ mask = LM3631_ENTIME_MASK;
+ break;
+ case LM3631_LDO_NEG:
+ addr = LM3631_REG_ENTIME_VNEG;
+ mask = LM3631_ENTIME_MASK;
+ break;
+ default:
+ return 0;
+ }
+
+ if (regmap_read(lm363x_regulator->regmap, addr, (unsigned int *)&val))
+ return -EINVAL;
+
+ val = (val & mask) >> LM3631_ENTIME_SHIFT;
+
+ if (id == LM3631_LDO_CONT)
+ return ldo_cont_enable_time[val];
+ else
+ return ENABLE_TIME_USEC * val;
+}
+
+static struct regulator_ops lm363x_boost_voltage_table_ops = {
+ .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 lm363x_regulator_voltage_table_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable_time = lm363x_regulator_enable_time,
+};
+
+static const struct regulator_desc lm363x_regulator_desc[] = {
+ /* LM3631 */
+ {
+ .name = "vboost",
+ .of_match = "vboost",
+ .id = LM3631_BOOST,
+ .ops = &lm363x_boost_voltage_table_ops,
+ .n_voltages = LM3631_BOOST_VSEL_MAX + 1,
+ .min_uV = LM3631_VBOOST_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3631_REG_VOUT_BOOST,
+ .vsel_mask = LM3631_VOUT_MASK,
+ },
+ {
+ .name = "ldo_cont",
+ .of_match = "vcont",
+ .id = LM3631_LDO_CONT,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3631_CONT_VSEL_MAX + 1,
+ .min_uV = LM3631_VCONT_MIN,
+ .uV_step = LM363X_STEP_500mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3631_REG_VOUT_CONT,
+ .vsel_mask = LM3631_VOUT_CONT_MASK,
+ .enable_reg = LM3631_REG_LDO_CTRL2,
+ .enable_mask = LM3631_EN_CONT_MASK,
+ },
+ {
+ .name = "ldo_oref",
+ .of_match = "voref",
+ .id = LM3631_LDO_OREF,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
+ .min_uV = LM3631_VLDO_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3631_REG_VOUT_OREF,
+ .vsel_mask = LM3631_VOUT_MASK,
+ .enable_reg = LM3631_REG_LDO_CTRL1,
+ .enable_mask = LM3631_EN_OREF_MASK,
+ },
+ {
+ .name = "ldo_vpos",
+ .of_match = "vpos",
+ .id = LM3631_LDO_POS,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
+ .min_uV = LM3631_VLDO_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3631_REG_VOUT_POS,
+ .vsel_mask = LM3631_VOUT_MASK,
+ .enable_reg = LM3631_REG_LDO_CTRL1,
+ .enable_mask = LM3631_EN_VPOS_MASK,
+ },
+ {
+ .name = "ldo_vneg",
+ .of_match = "vneg",
+ .id = LM3631_LDO_NEG,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3631_LDO_VSEL_MAX + 1,
+ .min_uV = LM3631_VLDO_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3631_REG_VOUT_NEG,
+ .vsel_mask = LM3631_VOUT_MASK,
+ .enable_reg = LM3631_REG_LDO_CTRL1,
+ .enable_mask = LM3631_EN_VNEG_MASK,
+ },
+ /* LM3632 */
+ {
+ .name = "vboost",
+ .of_match = "vboost",
+ .id = LM3632_BOOST,
+ .ops = &lm363x_boost_voltage_table_ops,
+ .n_voltages = LM3632_BOOST_VSEL_MAX + 1,
+ .min_uV = LM3632_VBOOST_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3632_REG_VOUT_BOOST,
+ .vsel_mask = LM3632_VOUT_MASK,
+ },
+ {
+ .name = "ldo_vpos",
+ .of_match = "vpos",
+ .id = LM3632_LDO_POS,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3632_LDO_VSEL_MAX + 1,
+ .min_uV = LM3632_VLDO_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3632_REG_VOUT_POS,
+ .vsel_mask = LM3632_VOUT_MASK,
+ .enable_reg = LM3632_REG_BIAS_CONFIG,
+ .enable_mask = LM3632_EN_VPOS_MASK,
+ },
+ {
+ .name = "ldo_vneg",
+ .of_match = "vneg",
+ .id = LM3632_LDO_NEG,
+ .ops = &lm363x_regulator_voltage_table_ops,
+ .n_voltages = LM3632_LDO_VSEL_MAX + 1,
+ .min_uV = LM3632_VLDO_MIN,
+ .uV_step = LM363X_STEP_50mV,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .vsel_reg = LM3632_REG_VOUT_NEG,
+ .vsel_mask = LM3632_VOUT_MASK,
+ .enable_reg = LM3632_REG_BIAS_CONFIG,
+ .enable_mask = LM3632_EN_VNEG_MASK,
+ },
+};
+
+static int lm363x_regulator_of_get_enable_gpio(struct device_node *np, int id)
+{
+ /*
+ * Check LCM_EN1/2_GPIO is configured.
+ * Those pins are used for enabling VPOS/VNEG LDOs.
+ */
+ switch (id) {
+ case LM3632_LDO_POS:
+ return of_get_named_gpio(np, "ti,lcm-en1-gpio", 0);
+ case LM3632_LDO_NEG:
+ return of_get_named_gpio(np, "ti,lcm-en2-gpio", 0);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int lm363x_regulator_probe(struct platform_device *pdev)
+{
+ struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent);
+ struct lm363x_regulator *lm363x_regulator;
+ struct regmap *regmap = lmu->regmap;
+ struct regulator_config cfg = { };
+ struct regulator_dev *rdev;
+ struct device *dev = &pdev->dev;
+ int id = pdev->id;
+ int ret, ena_gpio;
+
+ lm363x_regulator = devm_kzalloc(dev, sizeof(*lm363x_regulator),
+ GFP_KERNEL);
+ if (!lm363x_regulator)
+ return -ENOMEM;
+
+ lm363x_regulator->regmap = regmap;
+
+ cfg.dev = dev;
+ cfg.driver_data = lm363x_regulator;
+ cfg.regmap = regmap;
+
+ /*
+ * LM3632 LDOs can be controlled by external pin.
+ * Register update is required if the pin is used.
+ */
+ ena_gpio = lm363x_regulator_of_get_enable_gpio(dev->of_node, id);
+ if (gpio_is_valid(ena_gpio)) {
+ cfg.ena_gpio = ena_gpio;
+ cfg.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
+
+ ret = regmap_update_bits(regmap, LM3632_REG_BIAS_CONFIG,
+ LM3632_EXT_EN_MASK,
+ LM3632_EXT_EN_MASK);
+ if (ret) {
+ dev_err(dev, "External pin err: %d\n", ret);
+ return ret;
+ }
+ }
+
+ rdev = devm_regulator_register(dev, &lm363x_regulator_desc[id], &cfg);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(dev, "[%d] regulator register err: %d\n", id, ret);
+ return ret;
+ }
+
+ lm363x_regulator->regulator = rdev;
+ platform_set_drvdata(pdev, lm363x_regulator);
+
+ return 0;
+}
+
+static struct platform_driver lm363x_regulator_driver = {
+ .probe = lm363x_regulator_probe,
+ .driver = {
+ .name = "lm363x-regulator",
+ },
+};
+
+module_platform_driver(lm363x_regulator_driver);
+
+MODULE_DESCRIPTION("TI LM363X Regulator Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:lm363x-regulator");
--
1.9.1

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