mfd: core: Add support for software nodes

The old device property API is going to be removed and
replaced with the newer software node API. This prepares MFD
subsystem for the transition.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/mfd-core.c

@@ -244,6 +244,12 @@ static int mfd_add_device(struct device *parent, int id,
 			goto fail_of_entry;
 	}
 
+	if (cell->swnode) {
+		ret = device_add_software_node(&pdev->dev, cell->swnode);
+		if (ret)
+			goto fail_of_entry;
+	}
+
 	for (r = 0; r < cell->num_resources; r++) {
 		res[r].name = cell->resources[r].name;
 		res[r].flags = cell->resources[r].flags;
@@ -304,6 +310,7 @@ fail_of_entry:
 			list_del(&of_entry->list);
 			kfree(of_entry);
 		}
+	device_remove_software_node(&pdev->dev);
 fail_alias:
 	regulator_bulk_unregister_supply_alias(&pdev->dev,
 					       cell->parent_supplies,
@@ -372,6 +379,8 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 	regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
 					       cell->num_parent_supplies);
 
+	device_remove_software_node(&pdev->dev);
+
 	platform_device_unregister(pdev);
 	return 0;
 }

include/linux/mfd/core.h

@@ -50,6 +50,7 @@
 #define MFD_DEP_LEVEL_HIGH 1
 
 struct irq_domain;
+struct software_node;
 struct property_entry;
 
 /* Matches ACPI PNP id, either _HID or _CID, or ACPI _ADR */
@@ -78,6 +79,9 @@ struct mfd_cell {
 	void			*platform_data;
 	size_t			pdata_size;
 
+	/* Software node for the device. */
+	const struct software_node *swnode;
+
 	/* device properties passed to the sub devices drivers */
 	const struct property_entry *properties;