[PATCH v3 09/14] regulator: mt6370: Add mt6370 DisplayBias and VibLDO support

ChiaEn Wu
2022-06-23T11:59:23Z

From: ChiYuan Huang <cy_huang@richtek.com>

Add mt6370 DisplayBias and VibLDO support.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
---

v3
- Refine Kconfig help text
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/mt6370-regulator.c | 388 +++++++++++++++++++++++++++++++++++
3 files changed, 397 insertions(+)
create mode 100644 drivers/regulator/mt6370-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index cbe0f96..736f654a 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -804,6 +804,14 @@ config REGULATOR_MT6360
2-channel buck with Thermal Shutdown and Overload Protection
6-channel High PSRR and Low Dropout LDO.

+config REGULATOR_MT6370
+ tristate "MT6370 SubPMIC Regulator"
+ depends on MFD_MT6370
+ help
+ Say Y here to enable MT6370 regulator support.
+ This driver supports the control for DisplayBias voltages and one
+ general purpose LDO which is commonly used to drive the vibrator.
+
config REGULATOR_MT6380
tristate "MediaTek MT6380 PMIC"
depends on MTK_PMIC_WRAP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 8d3ee8b..f1cbff2 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -97,6 +97,7 @@ obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
obj-$(CONFIG_REGULATOR_MT6358) += mt6358-regulator.o
obj-$(CONFIG_REGULATOR_MT6359) += mt6359-regulator.o
obj-$(CONFIG_REGULATOR_MT6360) += mt6360-regulator.o
+obj-$(CONFIG_REGULATOR_MT6370) += mt6370-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o
diff --git a/drivers/regulator/mt6370-regulator.c b/drivers/regulator/mt6370-regulator.c
new file mode 100644
index 0000000..bc356b4
--- /dev/null
+++ b/drivers/regulator/mt6370-regulator.c
@@ -0,0 +1,388 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.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>
+
+enum {
+ MT6370_IDX_DSVBOOST = 0,
+ MT6370_IDX_DSVPOS,
+ MT6370_IDX_DSVNEG,
+ MT6370_IDX_VIBLDO,
+ MT6370_MAX_IDX
+};
+
+#define MT6370_REG_LDO_CFG 0x180
+#define MT6370_REG_LDO_VOUT 0x181
+#define MT6370_REG_DB_CTRL1 0x1B0
+#define MT6370_REG_DB_CTRL2 0x1B1
+#define MT6370_REG_DB_VBST 0x1B2
+#define MT6370_REG_DB_VPOS 0x1B3
+#define MT6370_REG_DB_VNEG 0x1B4
+#define MT6370_REG_LDO_STAT 0x1DC
+#define MT6370_REG_DB_STAT 0x1DF
+
+#define MT6370_LDOOMS_MASK BIT(7)
+#define MT6370_LDOEN_MASK BIT(7)
+#define MT6370_LDOVOUT_MASK GENMASK(3, 0)
+#define MT6370_DBPERD_MASK (BIT(7) | BIT(4))
+#define MT6370_DBEXTEN_MASK BIT(0)
+#define MT6370_DBVPOSEN_MASK BIT(6)
+#define MT6370_DBVPOSDISG_MASK BIT(5)
+#define MT6370_DBVNEGEN_MASK BIT(3)
+#define MT6370_DBVNEGDISG_MASK BIT(2)
+#define MT6370_DBALLON_MASK (MT6370_DBVPOSEN_MASK | MT6370_DBVNEGEN_MASK)
+#define MT6370_DBSLEW_MASK GENMASK(7, 6)
+#define MT6370_DBVOUT_MASK GENMASK(5, 0)
+#define MT6370_LDOOC_EVT_MASK BIT(7)
+#define MT6370_POSSCP_EVT_MASK BIT(7)
+#define MT6370_NEGSCP_EVT_MASK BIT(6)
+#define MT6370_BSTOCP_EVT_MASK BIT(5)
+#define MT6370_POSOCP_EVT_MASK BIT(4)
+#define MT6370_NEGOCP_EVT_MASK BIT(3)
+
+#define MT6370_LDO_MINUV 1600000
+#define MT6370_LDO_STPUV 200000
+#define MT6370_LDO_N_VOLT 13
+#define MT6370_DBVBOOST_MINUV 4000000
+#define MT6370_DBVBOOST_STPUV 50000
+#define MT6370_DBVBOOST_N_VOLT 45
+#define MT6370_DBVOUT_MINUV 4000000
+#define MT6370_DBVOUT_STPUV 50000
+#define MT6370_DBVOUT_N_VOLT 41
+
+struct mt6370_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator_dev *rdev[MT6370_MAX_IDX];
+ bool use_external_ctrl;
+};
+
+static const unsigned int mt6370_vpos_ramp_tbl[] = { 8540, 5840, 4830, 3000 };
+static const unsigned int mt6370_vneg_ramp_tbl[] = { 10090, 6310, 5050, 3150 };
+
+static int mt6370_get_error_flags(struct regulator_dev *rdev,
+ unsigned int *flags)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int stat_reg, stat, rpt_flags = 0;
+ int rid = rdev_get_id(rdev), ret;
+
+ if (rid == MT6370_IDX_VIBLDO)
+ stat_reg = MT6370_REG_LDO_STAT;
+ else
+ stat_reg = MT6370_REG_DB_STAT;
+
+ ret = regmap_read(regmap, stat_reg, &stat);
+ if (ret)
+ return ret;
+
+ switch (rid) {
+ case MT6370_IDX_DSVBOOST:
+ if (stat & MT6370_BSTOCP_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
+ break;
+ case MT6370_IDX_DSVPOS:
+ if (stat & MT6370_POSSCP_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
+
+ if (stat & MT6370_POSOCP_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
+ break;
+ case MT6370_IDX_DSVNEG:
+ if (stat & MT6370_NEGSCP_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
+
+ if (stat & MT6370_NEGOCP_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
+ break;
+ default:
+ if (stat & MT6370_LDOOC_EVT_MASK)
+ rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
+ break;
+ }
+
+ *flags = rpt_flags;
+ return 0;
+}
+
+static const struct regulator_ops mt6370_dbvboost_ops = {
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .get_bypass = regulator_get_bypass_regmap,
+ .set_bypass = regulator_set_bypass_regmap,
+ .get_error_flags = mt6370_get_error_flags,
+};
+
+static const struct regulator_ops mt6370_dbvout_ops = {
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_ramp_delay = regulator_set_ramp_delay_regmap,
+ .get_error_flags = mt6370_get_error_flags,
+};
+
+static const struct regulator_ops mt6370_ldo_ops = {
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .get_error_flags = mt6370_get_error_flags,
+};
+
+static int mt6370_of_parse_cb(struct device_node *np,
+ const struct regulator_desc *desc,
+ struct regulator_config *config)
+{
+ struct mt6370_priv *priv = config->driver_data;
+ struct gpio_desc *enable_gpio;
+ int ret;
+
+ enable_gpio = gpiod_get_from_of_node(np, "enable", 0, GPIOD_OUT_HIGH |
+ GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+ desc->name);
+ if (IS_ERR(enable_gpio)) {
+ config->ena_gpiod = NULL;
+ return 0;
+ }
+
+ /*
+ * RG control by default
+ * Only if all are using external pin, change all by external control
+ */
+ if (priv->use_external_ctrl) {
+ ret = regmap_update_bits(priv->regmap, MT6370_REG_DB_CTRL1,
+ MT6370_DBEXTEN_MASK,
+ MT6370_DBEXTEN_MASK);
+ if (ret)
+ return ret;
+ }
+
+ config->ena_gpiod = enable_gpio;
+ priv->use_external_ctrl = true;
+ return 0;
+}
+
+static const struct regulator_desc mt6370_regulator_descs[] = {
+ {
+ .name = "mt6370-dsv-vbst",
+ .of_match = of_match_ptr("dsvbst"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = MT6370_IDX_DSVBOOST,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .ops = &mt6370_dbvboost_ops,
+ .min_uV = MT6370_DBVBOOST_MINUV,
+ .uV_step = MT6370_DBVBOOST_STPUV,
+ .n_voltages = MT6370_DBVBOOST_N_VOLT,
+ .vsel_reg = MT6370_REG_DB_VBST,
+ .vsel_mask = MT6370_DBVOUT_MASK,
+ .bypass_reg = MT6370_REG_DB_CTRL1,
+ .bypass_mask = MT6370_DBPERD_MASK,
+ .bypass_val_on = MT6370_DBPERD_MASK,
+ },
+ {
+ .name = "mt6370-dsv-vpos",
+ .of_match = of_match_ptr("dsvpos"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = MT6370_IDX_DSVPOS,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .of_parse_cb = mt6370_of_parse_cb,
+ .ops = &mt6370_dbvout_ops,
+ .min_uV = MT6370_DBVOUT_MINUV,
+ .uV_step = MT6370_DBVOUT_STPUV,
+ .n_voltages = MT6370_DBVOUT_N_VOLT,
+ .vsel_reg = MT6370_REG_DB_VPOS,
+ .vsel_mask = MT6370_DBVOUT_MASK,
+ .enable_reg = MT6370_REG_DB_CTRL2,
+ .enable_mask = MT6370_DBVPOSEN_MASK,
+ .ramp_reg = MT6370_REG_DB_VPOS,
+ .ramp_mask = MT6370_DBSLEW_MASK,
+ .ramp_delay_table = mt6370_vpos_ramp_tbl,
+ .n_ramp_values = ARRAY_SIZE(mt6370_vpos_ramp_tbl),
+ .active_discharge_reg = MT6370_REG_DB_CTRL2,
+ .active_discharge_mask = MT6370_DBVPOSDISG_MASK,
+ .active_discharge_on = MT6370_DBVPOSDISG_MASK,
+ },
+ {
+ .name = "mt6370-dsv-vneg",
+ .of_match = of_match_ptr("dsvneg"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = MT6370_IDX_DSVNEG,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .of_parse_cb = mt6370_of_parse_cb,
+ .ops = &mt6370_dbvout_ops,
+ .min_uV = MT6370_DBVOUT_MINUV,
+ .uV_step = MT6370_DBVOUT_STPUV,
+ .n_voltages = MT6370_DBVOUT_N_VOLT,
+ .vsel_reg = MT6370_REG_DB_VNEG,
+ .vsel_mask = MT6370_DBVOUT_MASK,
+ .enable_reg = MT6370_REG_DB_CTRL2,
+ .enable_mask = MT6370_DBVNEGEN_MASK,
+ .ramp_reg = MT6370_REG_DB_VNEG,
+ .ramp_mask = MT6370_DBSLEW_MASK,
+ .ramp_delay_table = mt6370_vneg_ramp_tbl,
+ .n_ramp_values = ARRAY_SIZE(mt6370_vneg_ramp_tbl),
+ .active_discharge_reg = MT6370_REG_DB_CTRL2,
+ .active_discharge_mask = MT6370_DBVNEGDISG_MASK,
+ .active_discharge_on = MT6370_DBVNEGDISG_MASK,
+ },
+ {
+ .name = "mt6370-vib-ldo",
+ .of_match = of_match_ptr("vibldo"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = MT6370_IDX_VIBLDO,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ .ops = &mt6370_ldo_ops,
+ .min_uV = MT6370_LDO_MINUV,
+ .uV_step = MT6370_LDO_STPUV,
+ .n_voltages = MT6370_LDO_N_VOLT,
+ .vsel_reg = MT6370_REG_LDO_VOUT,
+ .vsel_mask = MT6370_LDOVOUT_MASK,
+ .enable_reg = MT6370_REG_LDO_VOUT,
+ .enable_mask = MT6370_LDOEN_MASK,
+ .active_discharge_reg = MT6370_REG_LDO_CFG,
+ .active_discharge_mask = MT6370_LDOOMS_MASK,
+ .active_discharge_on = MT6370_LDOOMS_MASK,
+ }
+};
+
+static irqreturn_t mt6370_scp_handler(int irq, void *data)
+{
+ struct regulator_dev *rdev = data;
+
+ regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE,
+ NULL);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mt6370_ocp_handler(int irq, void *data)
+{
+ struct regulator_dev *rdev = data;
+
+ regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL);
+ return IRQ_HANDLED;
+}
+
+static int mt6370_regulator_irq_register(struct mt6370_priv *priv)
+{
+ struct platform_device *pdev = to_platform_device(priv->dev);
+ static const struct {
+ const char *name;
+ int rid;
+ irq_handler_t handler;
+ } mt6370_irqs[] = {
+ { "db_vpos_scp", MT6370_IDX_DSVPOS, mt6370_scp_handler },
+ { "db_vneg_scp", MT6370_IDX_DSVNEG, mt6370_scp_handler },
+ { "db_vbst_ocp", MT6370_IDX_DSVBOOST, mt6370_ocp_handler },
+ { "db_vpos_ocp", MT6370_IDX_DSVPOS, mt6370_ocp_handler },
+ { "db_vneg_ocp", MT6370_IDX_DSVNEG, mt6370_ocp_handler },
+ { "ldo_oc", MT6370_IDX_VIBLDO, mt6370_ocp_handler }
+ };
+ struct regulator_dev *rdev;
+ int i, irq, ret;
+
+ for (i = 0; i < ARRAY_SIZE(mt6370_irqs); i++) {
+ irq = platform_get_irq_byname(pdev, mt6370_irqs[i].name);
+
+ rdev = priv->rdev[mt6370_irqs[i].rid];
+
+ ret = devm_request_threaded_irq(priv->dev, irq, NULL,
+ mt6370_irqs[i].handler, 0,
+ mt6370_irqs[i].name, rdev);
+ if (ret) {
+ dev_err(priv->dev,
+ "Failed to register (%d) interrupt\n", i);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int mt6370_regualtor_register(struct mt6370_priv *priv)
+{
+ struct regulator_dev *rdev;
+ struct regulator_config cfg = {};
+ struct device *parent = priv->dev->parent;
+ int i;
+
+ cfg.dev = parent;
+ cfg.driver_data = priv;
+
+ for (i = 0; i < MT6370_MAX_IDX; i++) {
+ rdev = devm_regulator_register(priv->dev,
+ mt6370_regulator_descs + i,
+ &cfg);
+ if (IS_ERR(rdev)) {
+ dev_err(priv->dev,
+ "Failed to register (%d) regulator\n", i);
+ return PTR_ERR(rdev);
+ }
+
+ priv->rdev[i] = rdev;
+ }
+
+ return 0;
+}
+
+static int mt6370_regulator_probe(struct platform_device *pdev)
+{
+ struct mt6370_priv *priv;
+ int 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 = mt6370_regualtor_register(priv);
+ if (ret)
+ return ret;
+
+ return mt6370_regulator_irq_register(priv);
+}
+
+static const struct platform_device_id mt6370_devid_table[] = {
+ { "mt6370-regulator", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(platform, mt6370_devid_table);
+
+static struct platform_driver mt6370_regulator_driver = {
+ .driver = {
+ .name = "mt6370-regulator",
+ },
+ .id_table = mt6370_devid_table,
+ .probe = mt6370_regulator_probe,
+};
+module_platform_driver(mt6370_regulator_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_DESCRIPTION("Mediatek MT6370 Regulator Driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4