[PATCH 7/8] hwmon: (pmbus/mp2975) Add regulator support

[Naresh Solanki <naresh.solanki@9elements.com>]

From: Patrick Rudolph <patrick.rudolph@9elements.com>

Add support to expose the PMBUS regulator.

Tested on MP2973 and MP2971.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
---
 drivers/hwmon/pmbus/Kconfig  |  7 +++++++
 drivers/hwmon/pmbus/mp2975.c | 15 +++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 270b6336b76d..b4e93bd5835e 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -317,6 +317,13 @@ config SENSORS_MP2975
 	  This driver can also be built as a module. If so, the module will
 	  be called mp2975.
 
+config SENSORS_MP2975_REGULATOR
+	depends on SENSORS_MP2975 && REGULATOR
+	bool "Regulator support for MPS MP2975"
+	help
+	  If you say yes here you get regulator support for MPS MP2975
+	  Dual Loop Digital Multi-Phase Controller.
+
 config SENSORS_MP5023
 	tristate "MPS MP5023"
 	help
diff --git a/drivers/hwmon/pmbus/mp2975.c b/drivers/hwmon/pmbus/mp2975.c
index 83242595ccbe..27a9724aed68 100644
--- a/drivers/hwmon/pmbus/mp2975.c
+++ b/drivers/hwmon/pmbus/mp2975.c
@@ -115,6 +115,11 @@ static const struct i2c_device_id mp2975_id[] = {
 
 MODULE_DEVICE_TABLE(i2c, mp2975_id);
 
+static const struct regulator_desc __maybe_unused mp2975_reg_desc[] = {
+	PMBUS_REGULATOR("vout", 0),
+	PMBUS_REGULATOR("vout", 1),
+};
+
 #define to_mp2975_data(x)  container_of(x, struct mp2975_data, info)
 
 static int
@@ -807,6 +812,10 @@ static struct pmbus_driver_info mp2975_info = {
 		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_POUT |
 		PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_PHASE_VIRTUAL,
 	.read_word_data = mp2975_read_word_data,
+#if IS_ENABLED(CONFIG_SENSORS_MP2975_REGULATOR)
+	.num_regulators = 1,
+	.reg_desc = mp2975_reg_desc,
+#endif
 };
 
 static struct pmbus_driver_info mp2973_info = {
@@ -824,6 +833,10 @@ static struct pmbus_driver_info mp2973_info = {
 		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_POUT |
 		PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
 	.read_word_data = mp2973_read_word_data,
+#if IS_ENABLED(CONFIG_SENSORS_MP2975_REGULATOR)
+	.num_regulators = 1,
+	.reg_desc = mp2975_reg_desc,
+#endif
 };
 
 static int mp2975_probe(struct i2c_client *client)
@@ -862,6 +875,8 @@ static int mp2975_probe(struct i2c_client *client)
 		data->info.pages = MP2975_PAGE_NUM;
 		data->info.phases[1] = ret;
 		data->info.func[1] = MP2975_RAIL2_FUNC;
+		if (CONFIG_SENSORS_MP2975_REGULATOR)
+			data->info.num_regulators = MP2975_PAGE_NUM;
 	}
 
 	if (data->chip_id == mp2975) {
-- 
2.41.0