[PATCH v1 6/7] regulator: lp872x: Add support for input and regulator power supplies

[Svyatoslav Ryhel <clamor95@gmail.com>]

The LP872x support dedicated main power supply input usually shared with
parent power supply for one of internal regulators (ldo1).

Add support for retrieving and managing these supply regulators using the
regulator framework to ensure proper power supply dependencies and
power-up sequencing.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/regulator/lp872x.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index 3d95ca7fa0246..df19a5cc94d0d 100644
--- a/drivers/regulator/lp872x.c
+++ b/drivers/regulator/lp872x.c
@@ -471,6 +471,7 @@ static const struct regulator_ops lp8725_buck_ops = {
 static const struct regulator_desc lp8720_regulator_desc[] = {
 	{
 		.name = "ldo1",
+		.supply_name = "vbatt",
 		.of_match = of_match_ptr("ldo1"),
 		.id = LP8720_ID_LDO1,
 		.ops = &lp872x_ldo_ops,
@@ -485,6 +486,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 	},
 	{
 		.name = "ldo2",
+		.supply_name = "vin1",
 		.of_match = of_match_ptr("ldo2"),
 		.id = LP8720_ID_LDO2,
 		.ops = &lp872x_ldo_ops,
@@ -499,6 +501,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 	},
 	{
 		.name = "ldo3",
+		.supply_name = "vin1",
 		.of_match = of_match_ptr("ldo3"),
 		.id = LP8720_ID_LDO3,
 		.ops = &lp872x_ldo_ops,
@@ -513,6 +516,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 	},
 	{
 		.name = "ldo4",
+		.supply_name = "vin2",
 		.of_match = of_match_ptr("ldo4"),
 		.id = LP8720_ID_LDO4,
 		.ops = &lp872x_ldo_ops,
@@ -527,6 +531,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 	},
 	{
 		.name = "ldo5",
+		.supply_name = "vin2",
 		.of_match = of_match_ptr("ldo5"),
 		.id = LP8720_ID_LDO5,
 		.ops = &lp872x_ldo_ops,
@@ -541,6 +546,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 	},
 	{
 		.name = "buck",
+		.supply_name = "vinb",
 		.of_match = of_match_ptr("buck"),
 		.id = LP8720_ID_BUCK,
 		.ops = &lp8720_buck_ops,
@@ -556,6 +562,7 @@ static const struct regulator_desc lp8720_regulator_desc[] = {
 static const struct regulator_desc lp8725_regulator_desc[] = {
 	{
 		.name = "ldo1",
+		.supply_name = "vin1",
 		.of_match = of_match_ptr("ldo1"),
 		.id = LP8725_ID_LDO1,
 		.ops = &lp872x_ldo_ops,
@@ -570,6 +577,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "ldo2",
+		.supply_name = "vin2",
 		.of_match = of_match_ptr("ldo2"),
 		.id = LP8725_ID_LDO2,
 		.ops = &lp872x_ldo_ops,
@@ -584,6 +592,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "ldo3",
+		.supply_name = "vin2",
 		.of_match = of_match_ptr("ldo3"),
 		.id = LP8725_ID_LDO3,
 		.ops = &lp872x_ldo_ops,
@@ -598,6 +607,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "ldo4",
+		.supply_name = "vin3",
 		.of_match = of_match_ptr("ldo4"),
 		.id = LP8725_ID_LDO4,
 		.ops = &lp872x_ldo_ops,
@@ -612,6 +622,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "ldo5",
+		.supply_name = "vin3",
 		.of_match = of_match_ptr("ldo5"),
 		.id = LP8725_ID_LDO5,
 		.ops = &lp872x_ldo_ops,
@@ -626,6 +637,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "lilo1",
+		.supply_name = "vinlilo1",
 		.of_match = of_match_ptr("lilo1"),
 		.id = LP8725_ID_LILO1,
 		.ops = &lp872x_ldo_ops,
@@ -640,6 +652,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "lilo2",
+		.supply_name = "vinlilo2",
 		.of_match = of_match_ptr("lilo2"),
 		.id = LP8725_ID_LILO2,
 		.ops = &lp872x_ldo_ops,
@@ -654,6 +667,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "buck1",
+		.supply_name = "vinb",
 		.of_match = of_match_ptr("buck1"),
 		.id = LP8725_ID_BUCK1,
 		.ops = &lp8725_buck_ops,
@@ -670,6 +684,7 @@ static const struct regulator_desc lp8725_regulator_desc[] = {
 	},
 	{
 		.name = "buck2",
+		.supply_name = "vinb",
 		.of_match = of_match_ptr("buck2"),
 		.id = LP8725_ID_BUCK2,
 		.ops = &lp8725_buck_ops,
@@ -743,6 +758,7 @@ static const struct regmap_config lp872x_regmap_config = {
 static int lp872x_probe(struct i2c_client *cl)
 {
 	struct device *dev = &cl->dev;
+	const char *in_supply_name;
 	struct lp872x *lp;
 	u8 general_config;
 	int ret;
@@ -760,6 +776,12 @@ static int lp872x_probe(struct i2c_client *cl)
 		return dev_err_probe(dev, PTR_ERR(lp->regmap),
 				     "Failed to init regmap\n");
 
+	/* LDO0 parent supplies chip itself */
+	in_supply_name = lp->info->rdesc[0].supply_name;
+	ret = devm_regulator_get_enable(dev, in_supply_name);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to enable supply regulator\n");
+
 	lp->dev = dev;
 	i2c_set_clientdata(cl, lp);
 
-- 
2.53.0