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

Daniel Scally
2020-11-30T13:32:50Z

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@gmail.com>
---
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