[PATCH net-next v2 1/7] of: base: Add of_get_available_child_by_name()
Biju Das
biju.das.jz at bp.renesas.com
Wed Feb 5 04:42:21 PST 2025
There are lot of drivers using of_get_child_by_name() followed by
of_device_is_available() to find the available child node by name for a
given parent. Provide a helper for these users to simplify the code.
Suggested-by: Geert Uytterhoeven <geert+renesas at glider.be>
Reviewed-by: Rob Herring <robh at kernel.org>
Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
---
previous v2->v2
* Added Rb tag from Rob.
v1->previous v2:
* Updated commit description.
* Updated kerneldoc comment block
* Avoided code duplication by using of_get_child_by_name().
---
drivers/of/base.c | 27 +++++++++++++++++++++++++++
include/linux/of.h | 9 +++++++++
2 files changed, 36 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index af6c68bbb427..e37b088f1fad 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -824,6 +824,33 @@ struct device_node *of_get_child_by_name(const struct device_node *node,
}
EXPORT_SYMBOL(of_get_child_by_name);
+/**
+ * of_get_available_child_by_name - Find the available child node by name for a given parent
+ * @node: parent node
+ * @name: child name to look for.
+ *
+ * This function looks for child node for given matching name and checks the
+ * device's availability for use.
+ *
+ * Return: A node pointer if found, with refcount incremented, use
+ * of_node_put() on it when done.
+ * Returns NULL if node is not found.
+ */
+struct device_node *of_get_available_child_by_name(const struct device_node *node,
+ const char *name)
+{
+ struct device_node *child;
+
+ child = of_get_child_by_name(node, name);
+ if (child && !of_device_is_available(child)) {
+ of_node_put(child);
+ return NULL;
+ }
+
+ return child;
+}
+EXPORT_SYMBOL(of_get_available_child_by_name);
+
struct device_node *__of_find_node_by_path(const struct device_node *parent,
const char *path)
{
diff --git a/include/linux/of.h b/include/linux/of.h
index eaf0e2a2b75c..9d6b8a61607f 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -301,6 +301,8 @@ extern struct device_node *of_get_compatible_child(const struct device_node *par
const char *compatible);
extern struct device_node *of_get_child_by_name(const struct device_node *node,
const char *name);
+extern struct device_node *of_get_available_child_by_name(const struct device_node *node,
+ const char *name);
/* cache lookup */
extern struct device_node *of_find_next_cache_node(const struct device_node *);
@@ -578,6 +580,13 @@ static inline struct device_node *of_get_child_by_name(
return NULL;
}
+static inline struct device_node *of_get_available_child_by_name(
+ const struct device_node *node,
+ const char *name)
+{
+ return NULL;
+}
+
static inline int of_device_is_compatible(const struct device_node *device,
const char *name)
{
--
2.43.0
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