Similar to OF endpoints, endpoint type nodes can be also supported on
ACPI. In order to make it possible for drivers to ignore the matter,
add a type for fwnode_endpoint and a function to parse them.
On ACPI, find the child node index instead of relying on the "endpoint"
property.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/base/property.c | 38 ++++++++++++++++++++++++++++++++++++++
include/linux/fwnode.h | 12 ++++++++++++
include/linux/property.h | 3 +++
3 files changed, 53 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4c7956e..09f348d 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1353,3 +1353,41 @@ fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode)
return endpoint;
}
EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint);
+
+/**
+ * fwnode_graph_parse_endpoint - parse common endpoint node properties
+ * @fwnode: pointer to endpoint fwnode_handle
+ * @endpoint: pointer to the fwnode endpoint data structure
+ *
+ * Parse @fwnode representing a graph endpoint node and store the
+ * information in @endpoint. The caller must hold a reference to
+ * @fwnode.
+ */
+int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
+ struct fwnode_endpoint *endpoint)
+{
+ struct fwnode_handle *port_fwnode = fwnode_get_parent(fwnode);
+
+ memset(endpoint, 0, sizeof(*endpoint));
+
+ endpoint->local_fwnode = fwnode;
+
+ if (is_acpi_node(port_fwnode)) {
+ struct fwnode_handle *iter;
+
+ fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
+
+ for (iter = fwnode_get_next_child_node(port_fwnode, NULL);
+ iter != fwnode;
+ iter = fwnode_get_next_child_node(port_fwnode, iter))
+ endpoint->id++;
+ } else {
+ fwnode_property_read_u32(port_fwnode, "reg", &endpoint->port);
+ fwnode_property_read_u32(fwnode, "reg", &endpoint->id);
+ }
+
+ fwnode_handle_put(port_fwnode);
+
+ return 0;
+}
+EXPORT_SYMBOL(fwnode_graph_parse_endpoint);
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 8bd28ce..3dff239 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -27,4 +27,16 @@ struct fwnode_handle {
struct fwnode_handle *secondary;
};
+/**
+ * struct fwnode_endpoint - Fwnode graph endpoint
+ * @port: Port number
+ * @id: Endpoint id
+ * @local_fwnode: reference to the related fwnode
+ */
+struct fwnode_endpoint {
+ unsigned int port;
+ unsigned int id;
+ const struct fwnode_handle *local_fwnode;
+};
+
#endif
diff --git a/include/linux/property.h b/include/linux/property.h
index 6e20a12..3a4e435 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -280,4 +280,7 @@ struct fwnode_handle *fwnode_graph_get_remote_port(
struct fwnode_handle *fwnode_graph_get_remote_endpoint(
struct fwnode_handle *fwnode);
+int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
+ struct fwnode_endpoint *endpoint);
+
#endif /* _LINUX_PROPERTY_H_ */
--
2.7.4
--
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