regulator: aw37503: add regulator driver for Awinic AW37503
authorAlec Li <like@awinic.com>
Mon, 21 Aug 2023 03:53:54 +0000 (03:53 +0000)
committerMark Brown <broonie@kernel.org>
Mon, 21 Aug 2023 12:10:21 +0000 (13:10 +0100)
Add regulator driver for the device Awinic AW37503 which is single
inductor - dual output power supply device. AW37503 device is
designed to support general positive/negative driven applications
like TFT display panels.

AW37503 regulator driver supports to enable/disable and set voltage
on its output.

Signed-off-by: Alec Li <like@awinic.com>
Link: https://lore.kernel.org/r/20230821035355.1269976-2-like@awinic.com
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/aw37503-regulator.c [new file with mode: 0644]

index 186b97c..965d4f0 100644 (file)
@@ -178,6 +178,14 @@ config REGULATOR_ATC260X
          ATC260x PMICs. This will enable support for all the software
          controllable DCDC/LDO regulators.
 
+config REGULATOR_AW37503
+       tristate "Awinic AW37503 Dual Output Power regulators"
+       depends on I2C && GPIOLIB
+       select REGMAP_I2C
+       help
+         This driver supports AW37503 single inductor - dual output
+         power supply specifically designed for display panels.
+
 config REGULATOR_AXP20X
        tristate "X-POWERS AXP20X PMIC Regulators"
        depends on MFD_AXP20X
index 0872755..2307471 100644 (file)
@@ -27,6 +27,7 @@ obj-$(CONFIG_REGULATOR_ARM_SCMI) += scmi-regulator.o
 obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o
 obj-$(CONFIG_REGULATOR_AS3722) += as3722-regulator.o
 obj-$(CONFIG_REGULATOR_ATC260X) += atc260x-regulator.o
+obj-$(CONFIG_REGULATOR_AW37503) += aw37503-regulator.o
 obj-$(CONFIG_REGULATOR_AXP20X) += axp20x-regulator.o
 obj-$(CONFIG_REGULATOR_BCM590XX) += bcm590xx-regulator.o
 obj-$(CONFIG_REGULATOR_BD71815)        += bd71815-regulator.o
diff --git a/drivers/regulator/aw37503-regulator.c b/drivers/regulator/aw37503-regulator.c
new file mode 100644 (file)
index 0000000..e01ef6a
--- /dev/null
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// AWINIC AW37503 Regulator Driver
+//
+// Copyright (C) 2023 awinic. All Rights Reserved
+//
+// Author: <like@awinic.com>
+
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#define AW37503_REG_VPOS               0x00
+#define AW37503_REG_VNEG               0x01
+#define AW37503_REG_APPS               0x03
+#define AW37503_REG_CONTROL            0x04
+#define AW37503_REG_WPRTEN             0x21
+
+#define AW37503_VOUT_MASK              0x1F
+#define AW37503_VOUT_N_VOLTAGE         0x15
+#define AW37503_VOUT_VMIN              4000000
+#define AW37503_VOUT_VMAX              6000000
+#define AW37503_VOUT_STEP              100000
+
+#define AW37503_REG_APPS_DIS_VPOS      BIT(1)
+#define AW37503_REG_APPS_DIS_VNEG      BIT(0)
+
+#define AW37503_REGULATOR_ID_VPOS      0
+#define AW37503_REGULATOR_ID_VNEG      1
+#define AW37503_MAX_REGULATORS         2
+
+struct aw37503_reg_pdata {
+       struct gpio_desc *en_gpiod;
+       int ena_gpio_state;
+};
+
+struct aw37503_regulator {
+       struct device *dev;
+       struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS];
+};
+
+static int aw37503_regulator_enable(struct regulator_dev *rdev)
+{
+       struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
+       int id = rdev_get_id(rdev);
+       struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
+       int ret;
+
+       if (!IS_ERR(rpdata->en_gpiod)) {
+               gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
+               rpdata->ena_gpio_state = 1;
+       }
+
+       /* Hardware automatically enable discharge bit in enable */
+       if (rdev->constraints->active_discharge ==
+                       REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
+               ret = regulator_set_active_discharge_regmap(rdev, false);
+               if (ret < 0) {
+                       dev_err(chip->dev, "Failed to disable active discharge: %d\n",
+                               ret);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+static int aw37503_regulator_disable(struct regulator_dev *rdev)
+{
+       struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
+       int id = rdev_get_id(rdev);
+       struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
+
+       if (!IS_ERR(rpdata->en_gpiod)) {
+               gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
+               rpdata->ena_gpio_state = 0;
+       }
+
+       return 0;
+}
+
+static int aw37503_regulator_is_enabled(struct regulator_dev *rdev)
+{
+       struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
+       int id = rdev_get_id(rdev);
+       struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
+
+       if (!IS_ERR(rpdata->en_gpiod))
+               return rpdata->ena_gpio_state;
+
+       return 1;
+}
+
+static const struct regulator_ops aw37503_regulator_ops = {
+       .enable = aw37503_regulator_enable,
+       .disable = aw37503_regulator_disable,
+       .is_enabled = aw37503_regulator_is_enabled,
+       .list_voltage = regulator_list_voltage_linear,
+       .map_voltage = regulator_map_voltage_linear,
+       .get_voltage_sel = regulator_get_voltage_sel_regmap,
+       .set_voltage_sel = regulator_set_voltage_sel_regmap,
+       .set_active_discharge = regulator_set_active_discharge_regmap,
+};
+
+static int aw37503_of_parse_cb(struct device_node *np,
+                               const struct regulator_desc *desc,
+                               struct regulator_config *config)
+{
+       struct aw37503_regulator *chip = config->driver_data;
+       struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id];
+       int ret;
+
+       rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np),
+                                                "enable", GPIOD_OUT_LOW,
+                                                "enable");
+
+       if (IS_ERR(rpdata->en_gpiod)) {
+               ret = PTR_ERR(rpdata->en_gpiod);
+
+               /* Ignore the error other than probe defer */
+               if (ret == -EPROBE_DEFER)
+                       return ret;
+               return 0;
+       }
+
+       return 0;
+}
+
+#define AW37503_REGULATOR_DESC(_id, _name)             \
+       [AW37503_REGULATOR_ID_##_id] = {                \
+               .name = "aw37503-"#_name,               \
+               .supply_name = "vin",                   \
+               .id = AW37503_REGULATOR_ID_##_id,       \
+               .of_match = of_match_ptr(#_name),       \
+               .of_parse_cb = aw37503_of_parse_cb,     \
+               .ops = &aw37503_regulator_ops,          \
+               .n_voltages = AW37503_VOUT_N_VOLTAGE,   \
+               .min_uV = AW37503_VOUT_VMIN,            \
+               .uV_step = AW37503_VOUT_STEP,           \
+               .enable_time = 500,                     \
+               .vsel_mask = AW37503_VOUT_MASK, \
+               .vsel_reg = AW37503_REG_##_id,          \
+               .active_discharge_off = 0,                      \
+               .active_discharge_on = AW37503_REG_APPS_DIS_##_id, \
+               .active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \
+               .active_discharge_reg = AW37503_REG_APPS, \
+               .type = REGULATOR_VOLTAGE,              \
+               .owner = THIS_MODULE,                   \
+       }
+
+static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = {
+       AW37503_REGULATOR_DESC(VPOS, outp),
+       AW37503_REGULATOR_DESC(VNEG, outn),
+};
+
+static const struct regmap_range aw37503_no_reg_ranges[] = {
+       regmap_reg_range(AW37503_REG_CONTROL + 1,
+                        AW37503_REG_WPRTEN - 1),
+};
+
+static const struct regmap_access_table aw37503_no_reg_table = {
+       .no_ranges = aw37503_no_reg_ranges,
+       .n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges),
+};
+
+static const struct regmap_config aw37503_regmap_config = {
+       .reg_bits       = 8,
+       .val_bits       = 8,
+       .max_register   = AW37503_REG_WPRTEN,
+       .rd_table       = &aw37503_no_reg_table,
+       .wr_table       = &aw37503_no_reg_table,
+};
+
+static int aw37503_probe(struct i2c_client *client)
+{
+       struct device *dev = &client->dev;
+       struct aw37503_regulator *chip;
+       struct regulator_dev *rdev;
+       struct regmap *regmap;
+       struct regulator_config config = { };
+       int id;
+
+       chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+       if (!chip)
+               return -ENOMEM;
+
+       regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config);
+       if (IS_ERR(regmap))
+               return dev_err_probe(dev, PTR_ERR(regmap),
+                                    "Failed to init regmap\n");
+
+       i2c_set_clientdata(client, chip);
+       chip->dev = dev;
+
+       config.regmap = regmap;
+       config.dev = dev;
+       config.driver_data = chip;
+
+       for (id = 0; id < AW37503_MAX_REGULATORS; ++id) {
+               rdev = devm_regulator_register(dev, &aw_regs_desc[id],
+                                              &config);
+               if (IS_ERR(rdev))
+                       return dev_err_probe(dev, PTR_ERR(rdev),
+                                            "Failed to register regulator %s\n",
+                                            aw_regs_desc[id].name);
+       }
+       return 0;
+}
+
+static const struct i2c_device_id aw37503_id[] = {
+       {.name = "aw37503",},
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, aw37503_id);
+
+static const struct of_device_id aw37503_of_match[] = {
+       {.compatible = "awinic,aw37503",},
+       { /* Sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, aw37503_of_match);
+
+static struct i2c_driver aw37503_i2c_driver = {
+       .driver = {
+               .name = "aw37503",
+               .of_match_table = aw37503_of_match,
+       },
+       .probe_new = aw37503_probe,
+       .id_table = aw37503_id,
+};
+
+module_i2c_driver(aw37503_i2c_driver);
+
+MODULE_DESCRIPTION("aw37503 regulator driver");
+MODULE_AUTHOR("Alec Li <like@awinic.com>");
+MODULE_LICENSE("GPL");