of/platform: add function to populate default bus

When a default bus like the simple-bus should be used someone had to
call of_platform_populate() with the default match table. This match
table was not exported, so it is impossible for code build as a module
to use this. Instead of exporting of_default_bus_match_table, add a new
function which uses this default match table and populates the bus.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/platform.c

@@ -456,6 +456,15 @@ int of_platform_populate(struct device_node *root,
 }
 EXPORT_SYMBOL_GPL(of_platform_populate);
 
+int of_platform_default_populate(struct device_node *root,
+				 const struct of_dev_auxdata *lookup,
+				 struct device *parent)
+{
+	return of_platform_populate(root, of_default_bus_match_table, lookup,
+				    parent);
+}
+EXPORT_SYMBOL_GPL(of_platform_default_populate);
+
 static int of_platform_device_destroy(struct device *dev, void *data)
 {
 	/* Do not touch devices not populated from the device tree */

include/linux/of_platform.h

@@ -72,6 +72,9 @@ extern int of_platform_populate(struct device_node *root,
 				const struct of_device_id *matches,
 				const struct of_dev_auxdata *lookup,
 				struct device *parent);
+extern int of_platform_default_populate(struct device_node *root,
+					const struct of_dev_auxdata *lookup,
+					struct device *parent);
 extern void of_platform_depopulate(struct device *parent);
 #else
 static inline int of_platform_populate(struct device_node *root,
@@ -81,6 +84,12 @@ static inline int of_platform_populate(struct device_node *root,
 {
 	return -ENODEV;
 }
+static inline int of_platform_default_populate(struct device_node *root,
+					       const struct of_dev_auxdata *lookup,
+					       struct device *parent)
+{
+	return -ENODEV;
+}
 static inline void of_platform_depopulate(struct device *parent) { }
 #endif