regulator: da9121: extend support to variants, add features

index 66bdfd1..c11fe04 100644
@@ -9,12 +9,7 @@
 #include <linux/regmap.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
-
-#define DA9121_BUCK_BUCK1_0			0x20
-#define DA9121_BUCK_BUCK1_0_CH1_EN		BIT(0)
-
-#define DA9121_BUCK_BUCK1_5			0x25
-#define DA9121_BUCK_BUCK1_5_CH1_A_VOUT		GENMASK(7, 0)
+#include "da9121-regulator.h"
 
 #define DA9121_MIN_MV		300
 #define DA9121_MAX_MV		1900

@@ -47,10 +42,10 @@
 	.min_uV = DA9121_MIN_MV * 1000,
 	.uV_step = DA9121_STEP_MV * 1000,
 	.linear_min_sel = DA9121_MIN_SEL,
-	.vsel_reg = DA9121_BUCK_BUCK1_5,
-	.vsel_mask = DA9121_BUCK_BUCK1_5_CH1_A_VOUT,
-	.enable_reg = DA9121_BUCK_BUCK1_0,
-	.enable_mask = DA9121_BUCK_BUCK1_0_CH1_EN,
+	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
+	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
+	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 	/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
 	.ramp_delay = 20000,
 	/* tBUCK_EN */

291 lines not on this page · raw message

index c11fe04..5bebdb2 100644
@@ -11,6 +11,12 @@
 #include <linux/i2c.h>
 #include "da9121-regulator.h"
 
+/* Chip data */
+struct da9121 {
+	struct device *dev;
+	int variant_id;
+};
+
 #define DA9121_MIN_MV		300
 #define DA9121_MAX_MV		1900
 #define DA9121_STEP_MV		10

@@ -53,19 +59,46 @@
 };
 
 static const struct of_device_id da9121_dt_ids[] = {
-	{ .compatible = "dlg,da9121", },
+	{ .compatible = "dlg,da9121", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
+	{ .compatible = "dlg,da9130", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
+	{ .compatible = "dlg,da9217", .data = (void *) DA9121_TYPE_DA9217 },
+	{ .compatible = "dlg,da9122", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
+	{ .compatible = "dlg,da9131", .data = (void *) DA9121_TYPE_DA9122_DA9131 },
+	{ .compatible = "dlg,da9220", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
+	{ .compatible = "dlg,da9132", .data = (void *) DA9121_TYPE_DA9220_DA9132 },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, da9121_dt_ids);
 
+static inline int da9121_of_get_id(struct device *dev)
+{
+	const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
+
+	if (!id) {
+		dev_err(dev, "%s: Failed\n", __func__);
+		return -EINVAL;
+	}
+	return (uintptr_t)id->data;
+}
+
 static int da9121_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
+	struct da9121 *chip;
+	int ret = 0;
 	struct device *dev = &i2c->dev;
 	struct regulator_config config = {};
 	struct regulator_dev *rdev;
 	struct regmap *regmap;
 
+	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
+	if (!chip) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	chip->variant_id = da9121_of_get_id(&i2c->dev);
+
 	regmap = devm_regmap_init_i2c(i2c, &da9121_regmap_config);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

@@ -80,11 +113,18 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 		return PTR_ERR(rdev);
 	}
 
-	return 0;
+error:
+	return ret;
 }
 
 static const struct i2c_device_id da9121_i2c_id[] = {
-	{ "da9121", 0 },
+	{"da9121", DA9121_TYPE_DA9121_DA9130},
+	{"da9130", DA9121_TYPE_DA9121_DA9130},
+	{"da9217", DA9121_TYPE_DA9217},
+	{"da9122", DA9121_TYPE_DA9122_DA9131},
+	{"da9131", DA9121_TYPE_DA9122_DA9131},
+	{"da9220", DA9121_TYPE_DA9220_DA9132},
+	{"da9132", DA9121_TYPE_DA9220_DA9132},
 	{},
 };
 MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);

index 137b1df..a717e2b 100644
@@ -41,6 +41,11 @@ struct da9121 {
 	.list_voltage = regulator_list_voltage_linear,
 };
 
+static struct of_regulator_match da9121_matches[] = {
+	[DA9121_IDX_BUCK1] = { .name = "buck1" },
+	[DA9121_IDX_BUCK2] = { .name = "buck2" },
+};
+
 #define DA9121_MIN_MV		300
 #define DA9121_MAX_MV		1900
 #define DA9121_STEP_MV		10

@@ -49,9 +54,11 @@ struct da9121 {
 				 + 1 + DA9121_MIN_SEL)
 
 static const struct regulator_desc da9121_reg = {
+	.id = DA9121_IDX_BUCK1,
 	.name = "da9121",
 	.of_match = "buck1",
 	.owner = THIS_MODULE,
+	.regulators_node = of_match_ptr("regulators"),
 	.ops = &da9121_buck_ops,
 	.type = REGULATOR_VOLTAGE,
 	.n_voltages = DA9121_N_VOLTAGES,

@@ -68,6 +75,105 @@ struct da9121 {
 	.enable_time = 20,
 };
 
+static const struct regulator_desc da9220_reg[2] = {
+	{
+		.id = DA9121_IDX_BUCK1,
+		.name = "DA9220/DA9132 BUCK1",
+		.of_match = "buck1",
+		.owner = THIS_MODULE,
+		.regulators_node = of_match_ptr("regulators"),
+		.ops = &da9121_buck_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = DA9121_N_VOLTAGES,
+		.min_uV = DA9121_MIN_MV * 1000,
+		.uV_step = DA9121_STEP_MV * 1000,
+		.linear_min_sel = DA9121_MIN_SEL,
+		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
+		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
+		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
+		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+	},
+	{
+		.id = DA9121_IDX_BUCK2,
+		.name = "DA9220/DA9132 BUCK2",
+		.of_match = "buck2",
+		.owner = THIS_MODULE,
+		.regulators_node = of_match_ptr("regulators"),
+		.ops = &da9121_buck_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = DA9121_N_VOLTAGES,
+		.min_uV = DA9121_MIN_MV * 1000,
+		.uV_step = DA9121_STEP_MV * 1000,
+		.linear_min_sel = DA9121_MIN_SEL,
+		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
+		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
+		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
+		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+	}
+};
+
+static const struct regulator_desc da9122_reg[2] = {
+	{
+		.id = DA9121_IDX_BUCK1,
+		.name = "DA9122/DA9131 BUCK1",
+		.of_match = "buck1",
+		.owner = THIS_MODULE,
+		.regulators_node = of_match_ptr("regulators"),
+		.ops = &da9121_buck_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = DA9121_N_VOLTAGES,
+		.min_uV = DA9121_MIN_MV * 1000,
+		.uV_step = DA9121_STEP_MV * 1000,
+		.linear_min_sel = DA9121_MIN_SEL,
+		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
+		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
+		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
+		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+	},
+	{
+		.id = DA9121_IDX_BUCK2,
+		.name = "DA9122/DA9131 BUCK2",
+		.of_match = "buck2",
+		.owner = THIS_MODULE,
+		.regulators_node = of_match_ptr("regulators"),
+		.ops = &da9121_buck_ops,
+		.type = REGULATOR_VOLTAGE,
+		.n_voltages = DA9121_N_VOLTAGES,
+		.min_uV = DA9121_MIN_MV * 1000,
+		.uV_step = DA9121_STEP_MV * 1000,
+		.linear_min_sel = DA9121_MIN_SEL,
+		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
+		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
+		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
+		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+	}
+};
+
+static const struct regulator_desc da9217_reg = {
+	.id = DA9121_IDX_BUCK1,
+	.name = "DA9217 BUCK1",
+	.of_match = "buck1",
+	.owner = THIS_MODULE,
+	.regulators_node = of_match_ptr("regulators"),
+	.ops = &da9121_buck_ops,
+	.type = REGULATOR_VOLTAGE,
+	.n_voltages = DA9121_N_VOLTAGES,
+	.min_uV = DA9121_MIN_MV * 1000,
+	.uV_step = DA9121_STEP_MV * 1000,
+	.linear_min_sel = DA9121_MIN_SEL,
+	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
+	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
+	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
+	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
+};
+
+static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
+	[DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
+	[DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
+	[DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
+	[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
+};
+
 /* DA9121 chip register model */
 static const struct regmap_range da9121_1ch_readable_ranges[] = {
 	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),

@@ -255,6 +361,10 @@ static int da9121_assign_chip_model(struct i2c_client *i2c,
 		break;
 	}
 
+	/* Set these up for of_regulator_match call which may want .of_map_modes */
+	da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
+	da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
+
 	chip->regmap = devm_regmap_init_i2c(i2c, regmap);
 	if (IS_ERR(chip->regmap)) {
 		ret = PTR_ERR(chip->regmap);

289 lines not on this page · raw message

new file mode 100644
index 0000000..c31180d
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * DA9121 Single-channel dual-phase 10A buck converter
+ * DA9130 Single-channel dual-phase 10A buck converter (Automotive)
+ * DA9217 Single-channel dual-phase  6A buck converter
+ * DA9122 Dual-channel single-phase  5A buck converter
+ * DA9131 Dual-channel single-phase  5A buck converter (Automotive)
+ * DA9220 Dual-channel single-phase  3A buck converter
+ * DA9132 Dual-channel single-phase  3A buck converter (Automotive)
+ *
+ * Copyright (C) 2020  Dialog Semiconductor
+ *
+ * Authors: Adam Ward, Dialog Semiconductor
+ */
+
+#ifndef __LINUX_REGULATOR_DA9121_H
+#define __LINUX_REGULATOR_DA9121_H
+
+enum {
+	DA9121_IDX_BUCK1,
+	DA9121_IDX_BUCK2,
+	DA9121_IDX_MAX
+};
+
+#endif

index a717e2b..1f74371 100644
@@ -14,6 +14,7 @@
 // Copyright (C) 2020 Dialog Semiconductor
 
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/regulator/of_regulator.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/driver.h>

@@ -28,10 +29,67 @@
 /* Chip data */
 struct da9121 {
 	struct device *dev;
+	struct da9121_pdata *pdata;
 	struct regmap *regmap;
 	int variant_id;
 };
 
+/* Define ranges for different variants, enabling translation to/from
+ * registers. Maximums give scope to allow for transients.
+ */
+struct da9121_range {
+	int val_min;
+	int val_max;
+	int val_stp;
+	int reg_min;
+	int reg_max;
+};
+
+struct da9121_range da9121_10A_2phase_current = {
+	.val_min =  7000000,
+	.val_max = 20000000,
+	.val_stp =  1000000,
+	.reg_min = 1,
+	.reg_max = 14,
+};
+
+struct da9121_range da9121_6A_2phase_current = {
+	.val_min =  7000000,
+	.val_max = 12000000,
+	.val_stp =  1000000,
+	.reg_min = 1,
+	.reg_max = 6,
+};
+
+struct da9121_range da9121_5A_1phase_current = {
+	.val_min =  3500000,
+	.val_max = 10000000,
+	.val_stp =   500000,
+	.reg_min = 1,
+	.reg_max = 14,
+};
+
+struct da9121_range da9121_3A_1phase_current = {
+	.val_min = 3500000,
+	.val_max = 6000000,
+	.val_stp =  500000,
+	.reg_min = 1,
+	.reg_max = 6,
+};
+
+struct da9121_variant_info {
+	int num_bucks;
+	int num_phases;
+	struct da9121_range *current_range;
+};
+
+static const struct da9121_variant_info variant_parameters[] = {
+	{ 1, 2, &da9121_10A_2phase_current },	//DA9121_TYPE_DA9121_DA9130
+	{ 2, 1, &da9121_3A_1phase_current  },	//DA9121_TYPE_DA9220_DA9132
+	{ 2, 1, &da9121_5A_1phase_current  },	//DA9121_TYPE_DA9122_DA9131
+	{ 1, 2, &da9121_6A_2phase_current  },	//DA9121_TYPE_DA9217
+};
+
 static const struct regulator_ops da9121_buck_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,

@@ -46,6 +104,59 @@ struct da9121 {
 	[DA9121_IDX_BUCK2] = { .name = "buck2" },
 };
 
+static int da9121_of_parse_cb(struct device_node *np,
+				const struct regulator_desc *desc,
+				struct regulator_config *config)
+{
+	struct da9121 *chip = config->driver_data;
+	struct da9121_pdata *pdata;
+	struct gpio_desc *ena_gpiod;
+
+	if (chip->pdata == NULL) {
+		pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+	} else {
+		pdata = chip->pdata;
+	}
+
+	pdata->num_buck++;
+
+	if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
+		dev_err(chip->dev, "Error: excessive regulators for device\n");
+		return -ENODEV;
+	}
+
+	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
+						GPIOD_OUT_HIGH |
+						GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+						"da9121-enable");
+	if (!IS_ERR(ena_gpiod))
+		config->ena_gpiod = ena_gpiod;
+
+	if (variant_parameters[chip->variant_id].num_bucks == 2) {
+		uint32_t ripple_cancel;
+		uint32_t ripple_reg;
+		int ret;
+
+		if (of_property_read_u32(da9121_matches[pdata->num_buck].of_node,
+				"dlg,ripple-cancel", &ripple_cancel)) {
+			if (pdata->num_buck > 1)
+				ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
+			else
+				ripple_reg = DA9121_REG_BUCK_BUCK1_7;
+
+			ret = regmap_update_bits(chip->regmap, ripple_reg,
+				DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
+				ripple_cancel);
+			if (ret < 0)
+				dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
+		}
+	}
+
+	return 0;
+}
+
 #define DA9121_MIN_MV		300
 #define DA9121_MAX_MV		1900
 #define DA9121_STEP_MV		10

@@ -57,6 +168,7 @@ struct da9121 {
 	.id = DA9121_IDX_BUCK1,
 	.name = "da9121",
 	.of_match = "buck1",
+	.of_parse_cb = da9121_of_parse_cb,
 	.owner = THIS_MODULE,
 	.regulators_node = of_match_ptr("regulators"),
 	.ops = &da9121_buck_ops,

@@ -80,6 +192,7 @@ struct da9121 {
 		.id = DA9121_IDX_BUCK1,
 		.name = "DA9220/DA9132 BUCK1",
 		.of_match = "buck1",
+		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
 		.ops = &da9121_buck_ops,

@@ -97,6 +210,7 @@ struct da9121 {
 		.id = DA9121_IDX_BUCK2,
 		.name = "DA9220/DA9132 BUCK2",
 		.of_match = "buck2",
+		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
 		.ops = &da9121_buck_ops,

@@ -117,6 +231,7 @@ struct da9121 {
 		.id = DA9121_IDX_BUCK1,
 		.name = "DA9122/DA9131 BUCK1",
 		.of_match = "buck1",
+		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
 		.ops = &da9121_buck_ops,

@@ -134,6 +249,7 @@ struct da9121 {
 		.id = DA9121_IDX_BUCK2,
 		.name = "DA9122/DA9131 BUCK2",
 		.of_match = "buck2",
+		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
 		.ops = &da9121_buck_ops,

@@ -153,6 +269,7 @@ struct da9121 {
 	.id = DA9121_IDX_BUCK1,
 	.name = "DA9217 BUCK1",
 	.of_match = "buck1",
+	.of_parse_cb = da9121_of_parse_cb,
 	.owner = THIS_MODULE,
 	.regulators_node = of_match_ptr("regulators"),
 	.ops = &da9121_buck_ops,

@@ -415,6 +532,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 		goto error;
 	}
 
+	chip->pdata = i2c->dev.platform_data;
 	chip->variant_id = da9121_of_get_id(&i2c->dev);
 
 	ret = da9121_assign_chip_model(i2c, chip);

@@ -422,6 +540,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 		goto error;
 
 	config.dev = &i2c->dev;
+	config.driver_data = chip;
 	config.of_node = dev->of_node;
 	config.regmap = chip->regmap;
 

index c31180d..62d9d257 100644
@@ -16,10 +16,21 @@
 #ifndef __LINUX_REGULATOR_DA9121_H
 #define __LINUX_REGULATOR_DA9121_H
 
+#include <linux/regulator/machine.h>
+
+struct gpio_desc;
+
 enum {
 	DA9121_IDX_BUCK1,
 	DA9121_IDX_BUCK2,
 	DA9121_IDX_MAX
 };
 
+struct da9121_pdata {
+	int num_buck;
+	struct gpio_desc *gpiod_ren[DA9121_IDX_MAX];
+	struct device_node *reg_node[DA9121_IDX_MAX];
+	struct regulator_init_data *init_data[DA9121_IDX_MAX];
+};
+
 #endif

index 1f74371..6c82441 100644
@@ -31,6 +31,7 @@ struct da9121 {
 	struct device *dev;
 	struct da9121_pdata *pdata;
 	struct regmap *regmap;
+	struct regulator_dev *rdev[DA9121_IDX_MAX];
 	int variant_id;
 };
 

@@ -291,6 +292,35 @@ static int da9121_of_parse_cb(struct device_node *np,
 	[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
 };
 
+static int da9121_set_regulator_config(struct da9121 *chip)
+{
+	struct regulator_config config = { };
+	unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < max_matches; i++) {
+		const struct regulator_desc *regl_desc =
+			local_da9121_regulators[chip->variant_id][i];
+
+		config.dev = chip->dev;
+		config.driver_data = chip;
+		config.regmap = chip->regmap;
+
+		chip->rdev[i] = devm_regulator_register(chip->dev,
+					regl_desc, &config);
+		if (IS_ERR(chip->rdev[i])) {
+			dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
+				regl_desc->name, (i+1), max_matches);
+			ret = PTR_ERR(chip->rdev[i]);
+			goto error;
+		}
+	}
+
+error:
+	return ret;
+}
+
 /* DA9121 chip register model */
 static const struct regmap_range da9121_1ch_readable_ranges[] = {
 	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),

@@ -522,9 +552,6 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 {
 	struct da9121 *chip;
 	int ret = 0;
-	struct device *dev = &i2c->dev;
-	struct regulator_config config = {};
-	struct regulator_dev *rdev;
 
 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
 	if (!chip) {

@@ -539,16 +566,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 	if (ret < 0)
 		goto error;
 
-	config.dev = &i2c->dev;
-	config.driver_data = chip;
-	config.of_node = dev->of_node;
-	config.regmap = chip->regmap;
-
-	rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
-	if (IS_ERR(rdev)) {
-		dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
-		return PTR_ERR(rdev);
-	}
+	ret = da9121_set_regulator_config(chip);
 
 error:
 	return ret;

index a69acb2..8e50f55 100644
@@ -101,6 +101,11 @@ struct da9121_field {
 	{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
 };
 
+static const struct da9121_field da9121_mode_field[2] = {
+	{ DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
+	{ DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
+};
+
 static int da9121_get_current_limit(struct regulator_dev *rdev)
 {
 	struct da9121 *chip = rdev_get_drvdata(rdev);

@@ -202,6 +207,67 @@ static int da9121_set_current_limit(struct regulator_dev *rdev,
 	return ret;
 }
 
+static unsigned int da9121_map_mode(unsigned int mode)
+{
+	switch (mode) {
+	case DA9121_BUCK_MODE_FORCE_PWM:
+		return REGULATOR_MODE_FAST;
+	case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
+		return REGULATOR_MODE_NORMAL;
+	case DA9121_BUCK_MODE_AUTO:
+		return REGULATOR_MODE_IDLE;
+	case DA9121_BUCK_MODE_FORCE_PFM:
+		return REGULATOR_MODE_STANDBY;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct da9121 *chip = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	unsigned int val;
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		val = DA9121_BUCK_MODE_FORCE_PWM;
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
+		break;
+	case REGULATOR_MODE_IDLE:
+		val = DA9121_BUCK_MODE_AUTO;
+		break;
+	case REGULATOR_MODE_STANDBY:
+		val = DA9121_BUCK_MODE_FORCE_PFM;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(chip->regmap,
+				  da9121_mode_field[id].reg,
+				  da9121_mode_field[id].msk,
+				  val);
+}
+
+static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
+{
+	struct da9121 *chip = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	unsigned int val;
+	int ret = 0;
+
+	ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
+	if (ret < 0) {
+		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
+		return -EINVAL;
+	}
+
+	return da9121_map_mode(val & da9121_mode_field[id].msk);
+}
+
 static const struct regulator_ops da9121_buck_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,

@@ -211,6 +277,8 @@ static int da9121_set_current_limit(struct regulator_dev *rdev,
 	.list_voltage = regulator_list_voltage_linear,
 	.get_current_limit = da9121_get_current_limit,
 	.set_current_limit = da9121_set_current_limit,
+	.set_mode = da9121_buck_set_mode,
+	.get_mode = da9121_buck_get_mode,
 };
 
 static struct of_regulator_match da9121_matches[] = {

@@ -285,6 +353,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 	.of_parse_cb = da9121_of_parse_cb,
 	.owner = THIS_MODULE,
 	.regulators_node = of_match_ptr("regulators"),
+	.of_map_mode = da9121_map_mode,
 	.ops = &da9121_buck_ops,
 	.type = REGULATOR_VOLTAGE,
 	.n_voltages = DA9121_N_VOLTAGES,

@@ -309,6 +378,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
+		.of_map_mode = da9121_map_mode,
 		.ops = &da9121_buck_ops,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = DA9121_N_VOLTAGES,

@@ -327,6 +397,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
+		.of_map_mode = da9121_map_mode,
 		.ops = &da9121_buck_ops,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = DA9121_N_VOLTAGES,

@@ -348,6 +419,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
+		.of_map_mode = da9121_map_mode,
 		.ops = &da9121_buck_ops,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = DA9121_N_VOLTAGES,

@@ -366,6 +438,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 		.of_parse_cb = da9121_of_parse_cb,
 		.owner = THIS_MODULE,
 		.regulators_node = of_match_ptr("regulators"),
+		.of_map_mode = da9121_map_mode,
 		.ops = &da9121_buck_ops,
 		.type = REGULATOR_VOLTAGE,
 		.n_voltages = DA9121_N_VOLTAGES,

@@ -386,6 +459,7 @@ static int da9121_of_parse_cb(struct device_node *np,
 	.of_parse_cb = da9121_of_parse_cb,
 	.owner = THIS_MODULE,
 	.regulators_node = of_match_ptr("regulators"),
+	.of_map_mode = da9121_map_mode,
 	.ops = &da9121_buck_ops,
 	.type = REGULATOR_VOLTAGE,
 	.n_voltages = DA9121_N_VOLTAGES,

index 8e50f55..d9a8a4b 100644
@@ -23,15 +23,21 @@
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/regulator/da9121.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
 
 #include "da9121-regulator.h"
 
 /* Chip data */
 struct da9121 {
 	struct device *dev;
+	struct delayed_work work;
 	struct da9121_pdata *pdata;
 	struct regmap *regmap;
 	struct regulator_dev *rdev[DA9121_IDX_MAX];
+	unsigned int persistent[2];
+	unsigned int passive_delay;
+	int chip_irq;
 	int variant_id;
 };
 

@@ -106,6 +112,59 @@ struct da9121_field {
 	{ DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
 };
 
+struct status_event_data {
+	int buck_id; /* 0=core, 1/2-buck */
+	int reg_index;  /* index for status/event/mask register selection */
+	int status_bit; /* bit masks... */
+	int event_bit;
+	int mask_bit;
+	unsigned long notification; /* Notification for status inception */
+	char *warn; /* if NULL, notify - otherwise dev_warn this string */
+};
+
+#define DA9121_STATUS(id, bank, name, notification, warning) \
+	{ id, bank, \
+	DA9121_MASK_SYS_STATUS_##bank##_##name, \
+	DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
+	DA9121_MASK_SYS_MASK_##bank##_M_##name, \
+	notification, warning }
+
+/* For second buck related event bits that are specific to DA9122, DA9220 variants */
+#define DA9xxx_STATUS(id, bank, name, notification, warning) \
+	{ id, bank, \
+	DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
+	DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
+	DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
+	notification, warning }
+
+/* The status signals that may need servicing, depending on device variant.
+ * After assertion, they persist; so event is notified, the IRQ disabled,
+ * and status polled until clear again and IRQ is reenabled.
+ *
+ * SG/PG1/PG2 should be set when device first powers up and should never
+ * re-occur. When this driver starts, it is expected that these will have
+ * self-cleared for when the IRQs are enabled, so these should never be seen.
+ * If seen, the implication is that the device has reset.
+ *
+ * GPIO0/1/2 are not configured for use by default, so should not be seen.
+ */
+const struct status_event_data status_event_handling[] = {
+	DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
+	DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
+	DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
+	DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
+	DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
+	DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
+	DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
+	DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
+	DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
+	DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
+	DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
+	DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
+	DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
+	DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
+};
+
 static int da9121_get_current_limit(struct regulator_dev *rdev)
 {
 	struct da9121 *chip = rdev_get_drvdata(rdev);

@@ -479,6 +538,157 @@ static int da9121_of_parse_cb(struct device_node *np,
 	[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
 };
 
+static void da9121_status_poll_on(struct work_struct *work)
+{
+	struct da9121 *chip = container_of(work, struct da9121, work.work);
+	int status[3] = {0};
+	int clear[3] = {0};
+	unsigned long delay;
+	int i;
+	int ret;
+
+	ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
+	if (ret < 0) {
+		dev_err(chip->dev,
+			"Failed to read STATUS registers: %d\n", ret);
+		goto error;
+	}
+
+	/* Possible events are tested to be within range for the variant, potentially
+	 * masked by the IRQ handler (not just warned about), as having been masked,
+	 * and the respective state cleared - then flagged to unmask for next IRQ.
+	 */
+	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
+		const struct status_event_data *item = &status_event_handling[i];
+		int reg_idx = item->reg_index;
+		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
+		bool supported = (item->warn == NULL);
+		bool persisting = (chip->persistent[reg_idx] & item->event_bit);
+		bool now_cleared = !(status[reg_idx] & item->status_bit);
+
+		if (relevant && supported && persisting && now_cleared) {
+			clear[reg_idx] |= item->mask_bit;
+			chip->persistent[reg_idx] &= ~item->event_bit;
+		}
+	}
+
+	for (i = 0; i < 2; i++) {
+		if (clear[i]) {
+			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
+			unsigned int mbit = clear[i];
+
+			ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
+			if (ret < 0) {
+				dev_err(chip->dev,
+					"Failed to unmask 0x%02x %d\n",
+					reg, ret);
+				goto error;
+			}
+		}
+	}
+
+	if (chip->persistent[0] | chip->persistent[1]) {
+		delay = msecs_to_jiffies(chip->passive_delay);
+		queue_delayed_work(system_freezable_wq, &chip->work, delay);
+	}
+
+error:
+	return;
+}
+
+static irqreturn_t da9121_irq_handler(int irq, void *data)
+{
+	struct da9121 *chip = data;
+	struct regulator_dev *rdev;
+	int event[3] = {0};
+	int handled[3] = {0};
+	int mask[3] = {0};
+	int ret = IRQ_NONE;
+	int i;
+	int err;
+
+	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
+	if (err < 0) {
+		dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
+		ret = IRQ_NONE;
+		goto error;
+	}
+
+	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
+	if (err < 0) {
+		dev_err(chip->dev,
+			"Failed to read MASK registers: %d\n", ret);
+		ret = IRQ_NONE;
+		goto error;
+	}
+
+	rdev = chip->rdev[DA9121_IDX_BUCK1];
+
+	/* Possible events are tested to be within range for the variant, currently
+	 * enabled, and having triggered this IRQ. The event may then be notified,
+	 * or a warning given for unexpected events - those from device POR, and
+	 * currently unsupported GPIO configurations.
+	 */
+	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
+		const struct status_event_data *item = &status_event_handling[i];
+		int reg_idx = item->reg_index;
+		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
+		bool enabled = !(mask[reg_idx] & item->mask_bit);
+		bool active = (event[reg_idx] & item->event_bit);
+		bool notify = (item->warn == NULL);
+
+		if (relevant && enabled && active) {
+			if (notify) {
+				chip->persistent[reg_idx] |= item->event_bit;
+				regulator_notifier_call_chain(rdev, item->notification, NULL);
+			} else {
+				dev_warn(chip->dev, item->warn);
+				handled[reg_idx] |= item->event_bit;
+				ret = IRQ_HANDLED;
+			}
+		}
+	}
+
+	for (i = 0; i < 3; i++) {
+		if (event[i] != handled[i]) {
+			dev_warn(chip->dev,
+				"Unhandled event(s) in bank%d 0x%02x\n", i,
+				event[i] ^ handled[i]);
+		}
+	}
+
+	/* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
+	for (i = 0; i < 2; i++) {
+		if (handled[i]) {
+			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
+			unsigned int mbit = handled[i];
+
+			err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
+			if (err < 0) {
+				dev_err(chip->dev,
+					"Failed to mask 0x%02x interrupt %d\n",
+					reg, err);
+				ret = IRQ_NONE;
+				goto error;
+			}
+		}
+	}
+
+	/* clear the events */
+	if (handled[0] | handled[1] | handled[2]) {
+		err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
+		if (err < 0) {
+			dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
+			ret = IRQ_NONE;
+			goto error;
+		}
+	}
+
+	queue_delayed_work(system_freezable_wq, &chip->work, 0);
+error:
+	return ret;
+}
+
 static int da9121_set_regulator_config(struct da9121 *chip)
 {
 	struct regulator_config config = { };

@@ -711,6 +921,56 @@ static int da9121_assign_chip_model(struct i2c_client *i2c,
 	return ret;
 }
 
+static int da9121_config_irq(struct i2c_client *i2c,
+			struct da9121 *chip)
+{
+	unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
+	const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
+	int ret = 0;
+
+	chip->chip_irq = i2c->irq;
+
+	if (chip->chip_irq != 0) {
+		if (!of_property_read_u32(chip->dev->of_node,
+					  "dlg,irq-polling-delay-passive-ms",
+					  &p_delay)) {
+			if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
+			    p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
+				dev_warn(chip->dev,
+					 "Out-of-range polling period %d ms\n",
+					 p_delay);
+				p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
+			}
+		}
+
+		chip->passive_delay = p_delay;
+
+		ret = devm_request_threaded_irq(chip->dev,
+					chip->chip_irq, NULL,
+					da9121_irq_handler,
+					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
+					"da9121", chip);
+		if (ret != 0) {
+			dev_err(chip->dev, "Failed IRQ request: %d\n",
+				chip->chip_irq);
+			goto error;
+		}
+
+		ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
+		if (ret != 0) {
+			dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
+				ret);
+			goto error;
+		}
+
+		INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
+		dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
+			 chip->passive_delay);
+	}
+error:
+	return ret;
+}
+
 static const struct of_device_id da9121_dt_ids[] = {
 	{ .compatible = "dlg,da9121", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
 	{ .compatible = "dlg,da9130", .data = (void *) DA9121_TYPE_DA9121_DA9130 },

@@ -738,6 +998,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct da9121 *chip;
+	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
 	int ret = 0;
 
 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);

@@ -753,12 +1014,36 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 	if (ret < 0)
 		goto error;
 
+	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
+	if (ret != 0) {
+		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
+		goto error;
+	}
+
 	ret = da9121_set_regulator_config(chip);
+	if (ret < 0)
+		goto error;
+
+	ret = da9121_config_irq(i2c, chip);
 
 error:
 	return ret;
 }
 
+static int da9121_i2c_remove(struct i2c_client *i2c)
+{
+	struct da9121 *chip = i2c_get_clientdata(i2c);
+	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
+	int ret = 0;
+
+	cancel_delayed_work_sync(&chip->work);
+
+	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
+	if (ret != 0)
+		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
+	return ret;
+}
+
 static const struct i2c_device_id da9121_i2c_id[] = {
 	{"da9121", DA9121_TYPE_DA9121_DA9130},
 	{"da9130", DA9121_TYPE_DA9121_DA9130},

@@ -777,6 +1062,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 		.of_match_table = of_match_ptr(da9121_dt_ids),
 	},
 	.probe = da9121_i2c_probe,
+	.remove = da9121_i2c_remove,
 	.id_table = da9121_i2c_id,
 };
 

index 6c82441..a69acb2 100644
@@ -91,6 +91,117 @@ struct da9121_variant_info {
 	{ 1, 2, &da9121_6A_2phase_current  },	//DA9121_TYPE_DA9217
 };
 
+struct da9121_field {
+	unsigned int reg;
+	unsigned int msk;
+};
+
+static const struct da9121_field da9121_current_field[2] = {
+	{ DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
+	{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
+};
+
+static int da9121_get_current_limit(struct regulator_dev *rdev)
+{
+	struct da9121 *chip = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	struct da9121_range *range =
+		variant_parameters[chip->variant_id].current_range;
+	unsigned int val = 0;
+	int ret = 0;
+
+	ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
+	if (ret < 0) {
+		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
+		goto error;
+	}
+
+	if (val < range->reg_min) {
+		ret = -EACCES;
+		goto error;
+	}
+
+	if (val > range->reg_max) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	return range->val_min + (range->val_stp * (val - range->reg_min));
+error:
+	return ret;
+}
+
+static int da9121_ceiling_selector(struct regulator_dev *rdev,
+		int min, int max,
+		unsigned int *selector)
+{
+	struct da9121 *chip = rdev_get_drvdata(rdev);
+	struct da9121_range *range =
+		variant_parameters[chip->variant_id].current_range;
+	unsigned int level;
+	unsigned int i = 0;
+	unsigned int sel = 0;
+	int ret = 0;
+
+	if (range->val_min > max || range->val_max < min) {
+		dev_err(chip->dev,
+			"Requested current out of regulator capability\n");
+		ret = -EINVAL;
+		goto error;
+	}
+
+	level = range->val_max;
+	for (i = range->reg_max; i >= range->reg_min; i--) {
+		if (level <= max) {
+			sel = i;
+			break;
+		}
+		level -= range->val_stp;
+	}
+
+	if (level < min) {
+		dev_err(chip->dev,
+			"Best match falls below minimum requested current\n");
+		ret = -EINVAL;
+		goto error;
+	}
+
+	*selector = sel;
+error:
+	return ret;
+}
+
+static int da9121_set_current_limit(struct regulator_dev *rdev,
+				int min_ua, int max_ua)
+{
+	struct da9121 *chip = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	struct da9121_range *range =
+		variant_parameters[chip->variant_id].current_range;
+	unsigned int sel = 0;
+	int ret = 0;
+
+	if (min_ua < range->val_min ||
+	    max_ua > range->val_max) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
+	if (ret < 0)
+		goto error;
+
+	ret = regmap_update_bits(chip->regmap,
+				da9121_current_field[id].reg,
+				da9121_current_field[id].msk,
+				(unsigned int)sel);
+	if (ret < 0)
+		dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
+
+error:
+	return ret;
+}
+
 static const struct regulator_ops da9121_buck_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,

@@ -98,6 +209,8 @@ struct da9121_variant_info {
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.list_voltage = regulator_list_voltage_linear,
+	.get_current_limit = da9121_get_current_limit,
+	.set_current_limit = da9121_set_current_limit,
 };
 
 static struct of_regulator_match da9121_matches[] = {