[PATCH v3 03/12] of: dynamic: Add of_changeset_add_prop_copy()

Bjorn Andersson
2025-01-14T05:05:49Z

When implementing migration between bindings with different structure,
properties might move from one node to another.

Introduce a helper function to do this, releaving the caller from having
to care about the datatype of the property and/or peek into the struct
property.

Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
---
drivers/of/dynamic.c | 20 ++++++++++++++++++++
include/linux/of.h | 3 +++
2 files changed, 23 insertions(+)

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 0aba760f7577..e4d7ff53a892 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -1073,6 +1073,26 @@ int of_changeset_add_prop_bool(struct of_changeset *ocs, struct device_node *np,
}
EXPORT_SYMBOL_GPL(of_changeset_add_prop_bool);

+/**
+ * of_changeset_add_prop_copy() - Add a property with name and value copied
+ * from an existing property, to a changeset.
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @prop: existing property to copy
+ *
+ * Create a new property with name and value copied from a provided property,
+ * to a changeset.
+ *
+ * Return: 0 on success, a negative error value in case of an error.
+ */
+int of_changeset_add_prop_copy(struct of_changeset *ocs, struct device_node *np,
+ const struct property *prop)
+{
+ return of_changeset_add_prop_helper(ocs, np, prop);
+}
+EXPORT_SYMBOL_GPL(of_changeset_add_prop_copy);
+
static int of_changeset_update_prop_helper(struct of_changeset *ocs,
struct device_node *np,
const struct property *pp)
diff --git a/include/linux/of.h b/include/linux/of.h
index f921786cb8ac..6a9bcdf9d629 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1667,6 +1667,9 @@ int of_changeset_update_prop_string(struct of_changeset *ocs,
int of_changeset_add_prop_bool(struct of_changeset *ocs, struct device_node *np,
const char *prop_name);

+int of_changeset_add_prop_copy(struct of_changeset *ocs, struct device_node *np,
+ const struct property *prop);
+
#else /* CONFIG_OF_DYNAMIC */
static inline int of_reconfig_notifier_register(struct notifier_block *nb)
{

--
2.45.2