[PATCH 12/15] device property: Add support for fwnode endpoints

Sakari Ailus
2017-01-27T16:03:07Z

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.

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/base/property.c | 33 +++++++++++++++++++++++++++++++++
include/linux/fwnode.h | 6 ++++++
include/linux/property.h | 3 +++
3 files changed, 42 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 51c0881..21b103f 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1244,3 +1244,36 @@ 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
+ * @node: pointer to endpoint device_node
+ * @endpoint: pointer to the fwnode endpoint data structure
+ *
+ * The caller should hold a reference to @node.
+ */
+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;
+ /*
+ * It doesn't matter whether the two calls below succeed.
+ * If they don't then the default value 0 is used.
+ */
+ if (is_acpi_node(port_fwnode)) {
+ fwnode_property_read_u32(port_fwnode, "port", &endpoint->port);
+ fwnode_property_read_u32(fwnode, "endpoint", &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..cb60f29 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -27,4 +27,10 @@ struct fwnode_handle {
struct fwnode_handle *secondary;
};

+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 294418d..eb7ba73 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -283,4 +283,7 @@ static inline struct fwnode_handle *device_fwnode_handle(struct device *dev)
return dev->fwnode;
}

+int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
+ struct fwnode_endpoint *endpoint);
+
#endif /* _LINUX_PROPERTY_H_ */
--
2.7.4

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html