device property: Add support for fwnode endpoints

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@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 22849a89a8b57afcbc4cb0ede9342cb13194e902..8a53b8f1db662f81e05e9fb98b7e62212eb6408e 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1311,3 +1311,35 @@ 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)) {
+               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 8bd28ce6d76e2491d10942f60ad77cc15e1edea0..3dff2398a5f0beb8cf0e5f4dd1d139bb727bf480 100644 (file)
--- 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 6e20a12a2eecbdb05869dd873de3f59014756bb5..3a4e43599e0196410635c94210f81041a90d10e9 100644 (file)
--- 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_ */