[PATCH 1/2] of: implement new of_device_ensured_probed_by_alias_stem

[Andrej Picej]

Function first goes through all the aliases which have the given stem.
It then ensures that all the devices hiding under these aliases are
probed.

Signed-off-by: Andrej Picej <andrej.picej at norik.com>
---
 drivers/of/base.c | 28 ++++++++++++++++++++++++++++
 include/of.h      |  6 ++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 80465d6d50..055dba97ab 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -274,6 +274,34 @@ int of_alias_get_id_from(struct device_node *root, struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_alias_get_id_from);
 
+/**
+ * of_device_ensured_probed_by_alias_stem - Ensure all devices with alias base name
+ * are probed
+ * @stem:	Alias stem of the given device_node
+ *
+ * The function ensures all devices with the given alias stem are probed.
+ *
+ * Returns 0 on success or error code.
+ */
+int of_device_ensured_probed_by_alias_stem(const char *stem)
+{
+	struct alias_prop *app;
+	int id = -ENODEV;
+	int ret;
+
+	list_for_each_entry(app, &aliases_lookup, link) {
+		if (of_node_cmp(app->stem, stem) != 0)
+			continue;
+
+		ret = of_device_ensure_probed(app->np);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_device_ensured_probed_by_alias_stem);
+
 const char *of_alias_get(struct device_node *np)
 {
 	struct alias_prop *app;
diff --git a/include/of.h b/include/of.h
index 216d0ee763..95817c58a4 100644
--- a/include/of.h
+++ b/include/of.h
@@ -261,6 +261,7 @@ extern void of_alias_scan(void);
 extern int of_alias_get_id(struct device_node *np, const char *stem);
 extern int of_alias_get_id_from(struct device_node *root, struct device_node *np,
 				const char *stem);
+extern int of_device_ensured_probed_by_alias_stem(const char *stem);
 extern const char *of_alias_get(struct device_node *np);
 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 
@@ -750,6 +751,11 @@ static inline int of_alias_get_id_from(struct device_node *root, struct device_n
 	return -ENOSYS;
 }
 
+static int of_device_ensured_probed_by_aliases(const char *stem)
+{
+	return -ENOSYS;
+}
+
 static inline const char *of_alias_get(struct device_node *np)
 {
 	return NULL;
-- 
2.25.1