ofnode: support panel-timings in ofnode_decode_display_timing

The "Display Timings" in panel-common.yaml can be provided by 2 properties
- panel-timing: when display panels are restricted to a single resolution
                the "panel-timing" node expresses the required timings.
- display-timings: several resolutions with different timings are supported
                   with several timing subnode of "display-timings" node

This patch update the parsing function to handle this 2 possibility
when index = 0.

Reviewed-by: Patrice Chotard <[email protected]>
Reviewed-by: Yannick Fertre <[email protected]>
Signed-off-by: Raphael Gallais-Pou <[email protected]>

1 files changed, 10 insertions, 7 deletions

diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 071d998a0a5..cf1cf8abfbe 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -1221,13 +1221,16 @@ int ofnode_decode_display_timing(ofnode parent, int index,
 	int ret = 0;
 
 	timings = ofnode_find_subnode(parent, "display-timings");
-	if (!ofnode_valid(timings))
-		return -EINVAL;
-
-	i = 0;
-	ofnode_for_each_subnode(node, timings) {
-		if (i++ == index)
-			break;
+	if (ofnode_valid(timings)) {
+		i = 0;
+		ofnode_for_each_subnode(node, timings) {
+			if (i++ == index)
+				break;
+		}
+	} else {
+		if (index != 0)
+			return -EINVAL;
+		node = ofnode_find_subnode(parent, "panel-timing");
 	}
 
 	if (!ofnode_valid(node))