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    Subject[PATCH 3/4] regulator: rt5120: Add PMIC regulator support
    Date
    From: ChiYuan Huang <cy_huang@richtek.com>

    Add RT5120 PMIC regulator support.

    It integrates 4 buck convertes, 1 LDO voltage regulator, 1 external
    enable signal to control the external power source.

    Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
    ---
    drivers/regulator/Kconfig | 10 +
    drivers/regulator/Makefile | 1 +
    drivers/regulator/rt5120-regulator.c | 417 +++++++++++++++++++++++++++++++++++
    3 files changed, 428 insertions(+)
    create mode 100644 drivers/regulator/rt5120-regulator.c

    diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
    index 5ef2306..76039d5 100644
    --- a/drivers/regulator/Kconfig
    +++ b/drivers/regulator/Kconfig
    @@ -1047,6 +1047,16 @@ config REGULATOR_RT5033
    RT5033 PMIC. The device supports multiple regulators like
    current source, LDO and Buck.

    +config REGULATOR_RT5120
    + tristate "Richtek RT5120 PMIC Regulators"
    + depends on MFD_RT5120
    + help
    + This adds support for voltage regulator in Richtek RT5120 PMIC.
    + It integrates 4 channels buck controller, 1 channel LDO, 1 EXTEN
    + to control external power source. Only BUCK1 is adjustable from
    + 600mV to 1395mV, per step 6.250mV. The others are all fixed voltage
    + by external hardware circuit.
    +
    config REGULATOR_RT5190A
    tristate "Richtek RT5190A PMIC"
    depends on I2C
    diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
    index 1b64ad5..32fce42 100644
    --- a/drivers/regulator/Makefile
    +++ b/drivers/regulator/Makefile
    @@ -126,6 +126,7 @@ obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o
    obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o
    obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o
    obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o
    +obj-$(CONFIG_REGULATOR_RT5120) += rt5120-regulator.o
    obj-$(CONFIG_REGULATOR_RT5190A) += rt5190a-regulator.o
    obj-$(CONFIG_REGULATOR_RT6160) += rt6160-regulator.o
    obj-$(CONFIG_REGULATOR_RT6245) += rt6245-regulator.o
    diff --git a/drivers/regulator/rt5120-regulator.c b/drivers/regulator/rt5120-regulator.c
    new file mode 100644
    index 00000000..c786564
    --- /dev/null
    +++ b/drivers/regulator/rt5120-regulator.c
    @@ -0,0 +1,417 @@
    +// SPDX-License-Identifier: GPL-2.0+
    +
    +#include <linux/bits.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/of.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +#include <linux/regulator/driver.h>
    +#include <linux/regulator/machine.h>
    +#include <linux/regulator/of_regulator.h>
    +
    +#define RT5120_REG_PGSTAT 0x03
    +#define RT5120_REG_CH1VID 0x06
    +#define RT5120_REG_CH1SLPVID 0x07
    +#define RT5120_REG_ENABLE 0x08
    +#define RT5120_REG_MODECTL 0x09
    +#define RT5120_REG_UVOVPROT 0x0A
    +#define RT5120_REG_SLPCTL 0x0C
    +#define RT5120_REG_INTSTAT 0x1E
    +#define RT5120_REG_DISCHG 0x1F
    +
    +#define RT5120_OUTPG_MASK(rid) BIT(rid + 1)
    +#define RT5120_OUTUV_MASK(rid) BIT(rid + 9)
    +#define RT5120_OUTOV_MASK(rid) BIT(rid + 16)
    +#define RT5120_CH1VID_MASK GENMASK(6, 0)
    +#define RT5120_RIDEN_MASK(rid) BIT(rid + 1)
    +#define RT5120_RADEN_MASK(rid) BIT(rid)
    +#define RT5120_FPWM_MASK(rid) BIT(rid + 1)
    +#define RT5120_UVHICCUP_MASK BIT(1)
    +#define RT5120_OVHICCUP_MASK BIT(0)
    +#define RT5120_HOTDIE_MASK BIT(1)
    +
    +#define RT5120_BUCK1_MINUV 600000
    +#define RT5120_BUCK1_MAXUV 1393750
    +#define RT5120_BUCK1_STEPUV 6250
    +#define RT5120_BUCK1_NUM_VOLT 0x80
    +
    +#define RT5120_AUTO_MODE 0
    +#define RT5120_FPWM_MODE 1
    +
    +enum {
    + RT5120_REGULATOR_BUCK1 = 0,
    + RT5120_REGULATOR_BUCK2,
    + RT5120_REGULATOR_BUCK3,
    + RT5120_REGULATOR_BUCK4,
    + RT5120_REGULATOR_LDO,
    + RT5120_REGULATOR_EXTEN,
    + RT5120_MAX_REGULATOR
    +};
    +
    +struct rt5120_priv {
    + struct device *dev;
    + struct regmap *regmap;
    + struct regulator_desc rdesc[RT5120_MAX_REGULATOR];
    +};
    +
    +static int rt5120_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + int rid = rdev_get_id(rdev);
    + unsigned int mask = RT5120_FPWM_MASK(rid), val;
    +
    + switch (mode) {
    + case REGULATOR_MODE_NORMAL:
    + val = 0;
    + break;
    + case REGULATOR_MODE_FAST:
    + val = RT5120_FPWM_MASK(rid);
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + return regmap_update_bits(regmap, RT5120_REG_MODECTL, mask, val);
    +}
    +
    +static unsigned int rt5120_buck_get_mode(struct regulator_dev *rdev)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + int ret, rid = rdev_get_id(rdev);
    + unsigned int val;
    +
    + ret = regmap_read(regmap, RT5120_REG_MODECTL, &val);
    + if (ret)
    + return REGULATOR_MODE_INVALID;
    +
    + if (val & RT5120_FPWM_MASK(rid))
    + return REGULATOR_MODE_FAST;
    +
    + return REGULATOR_MODE_NORMAL;
    +}
    +
    +static int rt5120_regulator_get_error_flags(struct regulator_dev *rdev,
    + unsigned int *flags)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + unsigned int stat, hd_stat, cur_flags = 0;
    + int rid = rdev_get_id(rdev), ret;
    +
    + /*
    + * reg 0x03/0x04/0x05 to indicate PG/UV/OV
    + * use block read to descrease I/O xfer time
    + */
    + ret = regmap_raw_read(regmap, RT5120_REG_PGSTAT, &stat, 3);
    + if (ret)
    + return ret;
    +
    + ret = regmap_read(regmap, RT5120_REG_INTSTAT, &hd_stat);
    + if (ret)
    + return ret;
    +
    + if (!(stat & RT5120_OUTPG_MASK(rid))) {
    + if (stat & RT5120_OUTUV_MASK(rid))
    + cur_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
    +
    + if (stat & RT5120_OUTOV_MASK(rid))
    + cur_flags |= REGULATOR_ERROR_REGULATION_OUT;
    + }
    +
    + if (hd_stat & RT5120_HOTDIE_MASK)
    + cur_flags |= REGULATOR_ERROR_OVER_TEMP;
    +
    + *flags = cur_flags;
    + return 0;
    +}
    +
    +static int rt5120_buck1_set_suspend_voltage(struct regulator_dev *rdev, int uV)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + int sel;
    +
    + if (uV < RT5120_BUCK1_MINUV || uV > RT5120_BUCK1_MAXUV)
    + return -EINVAL;
    +
    + sel = (uV - RT5120_BUCK1_MINUV) / RT5120_BUCK1_STEPUV;
    + return regmap_write(regmap, RT5120_REG_CH1SLPVID, sel);
    +}
    +
    +static int rt5120_regulator_set_suspend_enable(struct regulator_dev *rdev)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + int rid = rdev_get_id(rdev);
    + unsigned int mask = RT5120_RIDEN_MASK(rid);
    +
    + return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, mask);
    +}
    +
    +static int rt5120_regulator_set_suspend_disable(struct regulator_dev *rdev)
    +{
    + struct regmap *regmap = rdev_get_regmap(rdev);
    + int rid = rdev_get_id(rdev);
    + unsigned int mask = RT5120_RIDEN_MASK(rid);
    +
    + return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, 0);
    +}
    +
    +static const struct regulator_ops rt5120_buck1_ops = {
    + .enable = regulator_enable_regmap,
    + .disable = regulator_disable_regmap,
    + .is_enabled = regulator_is_enabled_regmap,
    + .list_voltage = regulator_list_voltage_linear,
    + .set_voltage_sel = regulator_set_voltage_sel_regmap,
    + .get_voltage_sel = regulator_get_voltage_sel_regmap,
    + .set_active_discharge = regulator_set_active_discharge_regmap,
    + .set_mode = rt5120_buck_set_mode,
    + .get_mode = rt5120_buck_get_mode,
    + .get_error_flags = rt5120_regulator_get_error_flags,
    + .set_suspend_voltage = rt5120_buck1_set_suspend_voltage,
    + .set_suspend_enable = rt5120_regulator_set_suspend_enable,
    + .set_suspend_disable = rt5120_regulator_set_suspend_disable,
    +};
    +
    +static const struct regulator_ops rt5120_buck234_ops = {
    + .enable = regulator_enable_regmap,
    + .disable = regulator_disable_regmap,
    + .is_enabled = regulator_is_enabled_regmap,
    + .set_active_discharge = regulator_set_active_discharge_regmap,
    + .set_mode = rt5120_buck_set_mode,
    + .get_mode = rt5120_buck_get_mode,
    + .get_error_flags = rt5120_regulator_get_error_flags,
    + .set_suspend_enable = rt5120_regulator_set_suspend_enable,
    + .set_suspend_disable = rt5120_regulator_set_suspend_disable,
    +};
    +
    +static const struct regulator_ops rt5120_ldo_ops = {
    + .enable = regulator_enable_regmap,
    + .disable = regulator_disable_regmap,
    + .is_enabled = regulator_is_enabled_regmap,
    + .set_active_discharge = regulator_set_active_discharge_regmap,
    + .get_error_flags = rt5120_regulator_get_error_flags,
    + .set_suspend_enable = rt5120_regulator_set_suspend_enable,
    + .set_suspend_disable = rt5120_regulator_set_suspend_disable,
    +};
    +
    +static const struct regulator_ops rt5120_exten_ops = {
    + .enable = regulator_enable_regmap,
    + .disable = regulator_disable_regmap,
    + .is_enabled = regulator_is_enabled_regmap,
    + .set_suspend_enable = rt5120_regulator_set_suspend_enable,
    + .set_suspend_disable = rt5120_regulator_set_suspend_disable,
    +};
    +
    +static unsigned int rt5120_buck_of_map_mode(unsigned int mode)
    +{
    + switch (mode) {
    + case RT5120_AUTO_MODE:
    + return REGULATOR_MODE_NORMAL;
    + case RT5120_FPWM_MODE:
    + return REGULATOR_MODE_FAST;
    + default:
    + return REGULATOR_MODE_INVALID;
    + }
    +}
    +
    +static void rt5120_fillin_regulator_desc(struct regulator_desc *desc, int rid)
    +{
    + static const char * const name[] = { "buck1", "buck2", "buck3", "buck4",
    + "ldo", "exten" };
    + static const char * const sname[] = { "vin1", "vin2", "vin3", "vin4",
    + "vinldo", NULL };
    +
    + desc->name = name[rid];
    + desc->supply_name = sname[rid];
    + desc->owner = THIS_MODULE;
    + desc->type = REGULATOR_VOLTAGE;
    + desc->id = rid;
    + desc->enable_reg = RT5120_REG_ENABLE;
    + desc->enable_mask = RT5120_RIDEN_MASK(rid);
    + desc->active_discharge_reg = RT5120_REG_DISCHG;
    + desc->active_discharge_mask = RT5120_RADEN_MASK(rid);
    + desc->active_discharge_on = RT5120_RADEN_MASK(rid);
    +
    + switch (rid) {
    + case RT5120_REGULATOR_BUCK1:
    + desc->of_map_mode = rt5120_buck_of_map_mode;
    + desc->min_uV = RT5120_BUCK1_MINUV;
    + desc->uV_step = RT5120_BUCK1_STEPUV;
    + desc->n_voltages = RT5120_BUCK1_NUM_VOLT;
    + desc->vsel_reg = RT5120_REG_CH1VID,
    + desc->vsel_mask = RT5120_CH1VID_MASK,
    + desc->ops = &rt5120_buck1_ops;
    + break;
    + case RT5120_REGULATOR_BUCK2 ... RT5120_REGULATOR_BUCK4:
    + desc->of_map_mode = rt5120_buck_of_map_mode;
    + desc->n_voltages = 1;
    + desc->ops = &rt5120_buck234_ops;
    + break;
    + case RT5120_REGULATOR_LDO:
    + desc->n_voltages = 1;
    + desc->ops = &rt5120_ldo_ops;
    + break;
    + default:
    + desc->n_voltages = 1;
    + desc->ops = &rt5120_exten_ops;
    + break;
    + }
    +}
    +
    +static int rt5120_of_parse_cb(struct rt5120_priv *priv, int rid,
    + struct of_regulator_match *match)
    +{
    + struct regulator_desc *desc = priv->rdesc + rid;
    + struct regulator_init_data *init_data = match->init_data;
    +
    + if (!init_data || rid == RT5120_REGULATOR_BUCK1)
    + return 0;
    +
    + if (init_data->constraints.min_uV != init_data->constraints.max_uV) {
    + dev_err(priv->dev, "Variable voltage for fixed regulator\n");
    + return -EINVAL;
    + }
    +
    + desc->fixed_uV = init_data->constraints.min_uV;
    + init_data->constraints.apply_uV = 0;
    + return 0;
    +}
    +
    +static struct of_regulator_match rt5120_regu_match[RT5120_MAX_REGULATOR] = {
    + [RT5120_REGULATOR_BUCK1] = { .name = "buck1", },
    + [RT5120_REGULATOR_BUCK2] = { .name = "buck2", },
    + [RT5120_REGULATOR_BUCK3] = { .name = "buck3", },
    + [RT5120_REGULATOR_BUCK4] = { .name = "buck4", },
    + [RT5120_REGULATOR_LDO] = { .name = "ldo", },
    + [RT5120_REGULATOR_EXTEN] = { .name = "exten", }
    +};
    +
    +static int rt5120_parse_regulator_dt_data(struct rt5120_priv *priv)
    +{
    + struct device *dev = priv->dev->parent;
    + struct device_node *reg_node;
    + int i, ret;
    +
    + for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
    + rt5120_fillin_regulator_desc(priv->rdesc + i, i);
    +
    + rt5120_regu_match[i].desc = priv->rdesc + i;
    + }
    +
    + reg_node = of_get_child_by_name(dev->of_node, "regulators");
    + if (!reg_node) {
    + dev_err(priv->dev, "Couldn't find 'regulators' node\n");
    + return -ENODEV;
    + }
    +
    + ret = of_regulator_match(priv->dev, reg_node, rt5120_regu_match,
    + ARRAY_SIZE(rt5120_regu_match));
    +
    + of_node_put(reg_node);
    +
    + if (ret < 0) {
    + dev_err(priv->dev,
    + "Error parsing regulator init data (%d)\n", ret);
    + return ret;
    + }
    +
    + for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
    + ret = rt5120_of_parse_cb(priv, i, rt5120_regu_match + i);
    + if (ret) {
    + dev_err(priv->dev, "Failed in [%d] of_passe_cb\n", i);
    + return ret;
    + }
    + }
    +
    + return 0;
    +}
    +
    +static int rt5120_device_property_init(struct rt5120_priv *priv)
    +{
    + struct device *dev = priv->dev->parent;
    + bool prot_enable;
    + unsigned int prot_enable_val = 0;
    +
    + /* Assign UV/OV HW protection behavior */
    + prot_enable = device_property_read_bool(dev,
    + "richtek,enable-undervolt-hiccup");
    + if (prot_enable)
    + prot_enable_val |= RT5120_UVHICCUP_MASK;
    +
    + prot_enable = device_property_read_bool(dev,
    + "richtek,enable-overvolt-hiccup");
    + if (prot_enable)
    + prot_enable_val |= RT5120_OVHICCUP_MASK;
    +
    + return regmap_update_bits(priv->regmap, RT5120_REG_UVOVPROT,
    + RT5120_UVHICCUP_MASK | RT5120_OVHICCUP_MASK,
    + prot_enable_val);
    +}
    +
    +static int rt5120_regulator_probe(struct platform_device *pdev)
    +{
    + struct rt5120_priv *priv;
    + struct regulator_dev *rdev;
    + struct regulator_config config = {};
    + int i, ret;
    +
    + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
    + if (!priv)
    + return -ENOMEM;
    +
    + priv->dev = &pdev->dev;
    +
    + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
    + if (!priv->regmap) {
    + dev_err(&pdev->dev, "Failed to init regmap\n");
    + return -ENODEV;
    + }
    +
    + ret = rt5120_device_property_init(priv);
    + if (ret) {
    + dev_err(&pdev->dev, "Failed to do property init\n");
    + return ret;
    + }
    +
    + ret = rt5120_parse_regulator_dt_data(priv);
    + if (ret) {
    + dev_err(&pdev->dev, "Failed to parse dt data\n");
    + return ret;
    + }
    +
    + config.dev = &pdev->dev;
    + config.regmap = priv->regmap;
    +
    + for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
    + config.of_node = rt5120_regu_match[i].of_node;
    + config.init_data = rt5120_regu_match[i].init_data;
    +
    + rdev = devm_regulator_register(&pdev->dev, priv->rdesc + i,
    + &config);
    + if (IS_ERR(rdev)) {
    + dev_err(&pdev->dev,
    + "Failed to register regulator [%d]\n", i);
    + return PTR_ERR(rdev);
    + }
    + }
    +
    + return 0;
    +}
    +
    +static const struct platform_device_id rt5120_regulator_dev_table[] = {
    + { "rt5120-regulator", 0 },
    + {}
    +};
    +MODULE_DEVICE_TABLE(platform, rt5120_regulator_dev_table);
    +
    +static struct platform_driver rt5120_regulator_driver = {
    + .driver = {
    + .name = "rt5120-regulator",
    + },
    + .id_table = rt5120_regulator_dev_table,
    + .probe = rt5120_regulator_probe,
    +};
    +module_platform_driver(rt5120_regulator_driver);
    +
    +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
    +MODULE_DESCRIPTION("Richtek RT5120 regulator driver");
    +MODULE_LICENSE("GPL v2");
    --
    2.7.4
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      Last update: 2022-06-07 07:53    [W:3.078 / U:0.032 seconds]
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