[PATCH 02/18] property: Add support for calling fwnode_graph_get_endpoint_by_id() for fwnode->secondary

[Daniel Scally]

This function is used to find fwnode endpoints against a device. In
some instances those endpoints are software nodes which are children of
fwnode->secondary. Add support to fwnode_graph_get_endpoint_by_id() to
find those endpoints by recursively calling itself passing the ptr to
fwnode->secondary in the event no endpoint is found for the primary.

Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
---
Changes since RFC v3:

	Patch introduced. In discussion in the last submission I noted
	that the CIO2 device doesn't have an ACPI fwnode - that turns
	out to be true for _some_ devices but not others, so we need
	this function to check the secondary too.

 drivers/base/property.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index a5ca2306796f..4ece6b086e36 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1162,6 +1162,10 @@ fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
 		best_ep_id = fwnode_ep.id;
 	}
 
+	if (!best_ep && fwnode && !IS_ERR_OR_NULL(fwnode->secondary))
+		return fwnode_graph_get_endpoint_by_id(fwnode->secondary, port,
+						       endpoint, flags);
+
 	return best_ep;
 }
 EXPORT_SYMBOL_GPL(fwnode_graph_get_endpoint_by_id);
-- 
2.25.1