[PATCH v2 3/3] mfd: aat2870: Add support for VIN and IN-LDO power supplies

[Svyatoslav Ryhel]

The AAT2870 supports a dedicated main power supply input alongside parent
power supply for its internal regulators.

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

Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
---
 drivers/mfd/aat2870-core.c            | 5 +++++
 drivers/regulator/aat2870-regulator.c | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/mfd/aat2870-core.c b/drivers/mfd/aat2870-core.c
index 909c14ee60323..0bd430b90bc1b 100644
--- a/drivers/mfd/aat2870-core.c
+++ b/drivers/mfd/aat2870-core.c
@@ -17,6 +17,7 @@
 #include <linux/mfd/core.h>
 #include <linux/mfd/aat2870.h>
 #include <linux/of_platform.h>
+#include <linux/regulator/consumer.h>
 #include <linux/regulator/machine.h>
 
 struct aat2870_register {
@@ -309,6 +310,10 @@ static int aat2870_i2c_probe(struct i2c_client *client)
 
 	aat2870->reg_cache = aat2870_regs;
 
+	ret = devm_regulator_get_enable(&client->dev, "vin");
+	if (ret)
+		return dev_err_probe(&client->dev, ret, "Failed to enable regulator\n");
+
 	aat2870->en_pin = devm_gpiod_get_optional(&client->dev, "enable",
 						  GPIOD_OUT_HIGH);
 	if (IS_ERR(aat2870->en_pin))
diff --git a/drivers/regulator/aat2870-regulator.c b/drivers/regulator/aat2870-regulator.c
index 8a58eb27f3f5f..a921e40ca47dd 100644
--- a/drivers/regulator/aat2870-regulator.c
+++ b/drivers/regulator/aat2870-regulator.c
@@ -114,6 +114,7 @@ static const unsigned int aat2870_ldo_voltages[] = {
 	{						\
 		.desc = {				\
 			.name = #ids,			\
+			.supply_name = "in-ldo",	\
 			.id = AAT2870_ID_##ids,		\
 			.n_voltages = ARRAY_SIZE(aat2870_ldo_voltages),	\
 			.volt_table = aat2870_ldo_voltages, \
-- 
2.53.0