From 125ee6b3b0fa920c730b0991e6f083a9f5b1e4c3 Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Tue, 6 Jun 2017 12:37:40 +0300 Subject: [PATCH] device property: Add FW type agnostic fwnode_graph_get_remote_node Add fwnode_graph_get_remote_node() function which is equivalent to of_graph_get_remote_node() on OF. Signed-off-by: Sakari Ailus Reviewed-by: Mika Westerberg Signed-off-by: Rafael J. Wysocki --- drivers/base/property.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/property.h | 2 ++ 2 files changed, 39 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index b979f8a2f4fb..ac3590b1f93d 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1215,6 +1215,43 @@ fwnode_graph_get_remote_endpoint(struct fwnode_handle *fwnode) } EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_endpoint); +/** + * fwnode_graph_get_remote_node - get remote parent node for given port/endpoint + * @fwnode: pointer to parent fwnode_handle containing graph port/endpoint + * @port_id: identifier of the parent port node + * @endpoint_id: identifier of the endpoint node + * + * Return: Remote fwnode handle associated with remote endpoint node linked + * to @node. Use fwnode_node_put() on it when done. + */ +struct fwnode_handle *fwnode_graph_get_remote_node(struct fwnode_handle *fwnode, + u32 port_id, u32 endpoint_id) +{ + struct fwnode_handle *endpoint = NULL; + + while ((endpoint = fwnode_graph_get_next_endpoint(fwnode, endpoint))) { + struct fwnode_endpoint fwnode_ep; + struct fwnode_handle *remote; + int ret; + + ret = fwnode_graph_parse_endpoint(endpoint, &fwnode_ep); + if (ret < 0) + continue; + + if (fwnode_ep.port != port_id || fwnode_ep.id != endpoint_id) + continue; + + remote = fwnode_graph_get_remote_port_parent(endpoint); + if (!remote) + return NULL; + + return fwnode_device_is_available(remote) ? remote : NULL; + } + + return NULL; +} +EXPORT_SYMBOL_GPL(fwnode_graph_get_remote_node); + /** * fwnode_graph_parse_endpoint - parse common endpoint node properties * @fwnode: pointer to endpoint fwnode_handle diff --git a/include/linux/property.h b/include/linux/property.h index 7be014af78ed..0597a743aa66 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -281,6 +281,8 @@ struct fwnode_handle *fwnode_graph_get_remote_port( struct fwnode_handle *fwnode); struct fwnode_handle *fwnode_graph_get_remote_endpoint( struct fwnode_handle *fwnode); +struct fwnode_handle *fwnode_graph_get_remote_node(struct fwnode_handle *fwnode, + u32 port, u32 endpoint); int fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode, struct fwnode_endpoint *endpoint); -- GitLab