From: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
V4L2 async notifiers can pass the endpoint fwnode rather than the device
fwnode.
Provide a helper to obtain the parent device fwnode without first
parsing the remote-endpoint as per fwnode_graph_get_remote_port_parent.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
---
drivers/base/property.c | 25 +++++++++++++++++++++++++
include/linux/property.h | 2 ++
2 files changed, 27 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 627ebc9b570d..caf4316fe565 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1245,6 +1245,31 @@ fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode,
EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
/**
+ * fwnode_graph_get_port_parent - Return device node of a port endpoint
+ * @fwnode: Endpoint firmware node pointing of the port
+ *
+ * Extracts firmware node of the device the @fwnode belongs to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_port_parent(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent = NULL;
+
+ if (is_of_node(fwnode)) {
+ struct device_node *node;
+
+ node = of_graph_get_port_parent(to_of_node(fwnode));
+ if (node)
+ parent = &node->fwnode;
+ } else if (is_acpi_node(fwnode)) {
+ parent = acpi_node_get_parent(fwnode);
+ }
+
+ return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
+
+/**
* fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
* @fwnode: Endpoint firmware node pointing to the remote endpoint
*
diff --git a/include/linux/property.h b/include/linux/property.h
index 2f482616a2f2..624129b86c82 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -274,6 +274,8 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen);
struct fwnode_handle *fwnode_graph_get_next_endpoint(
struct fwnode_handle *fwnode, struct fwnode_handle *prev);
+struct fwnode_handle *fwnode_graph_get_port_parent(
+ struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port_parent(
struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_graph_get_remote_port(
--
git-series 0.9.1
