[RFC PATCH 2/5] ACPI: property: Add ports/in-ports/out-ports support to acpi_fwnode_get_parent()

[Sunil V L <sunilvl@oss.qualcomm.com>]

From: Sunil V L <sunilvl@oss.qualcomm.com>

For collections of ports, the node name may be defined as "ports",
"in-ports", or "out-ports". Currently, acpi_fwnode_get_parent() does
not handle these container nodes, which can lead to incorrect parent
resolution when parsing remote-endpoints via common fwnode_* interfaces.

Extend acpi_fwnode_get_parent() to recognize "ports", "in-ports", and
"out-ports" as container nodes and ensure the correct parent node is
returned.

Signed-off-by: Sunil V L <sunilvl@oss.qualcomm.com>
---
 drivers/acpi/property.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 8ee5a1f0eb48..78400620390b 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1422,7 +1422,7 @@ static struct fwnode_handle *
 acpi_node_get_parent(const struct fwnode_handle *fwnode)
 {
 	if (is_acpi_data_node(fwnode)) {
-		/* All data nodes have parent pointer so just return that */
+		/* Keep the structural parent for generic fwnode iteration. */
 		return to_acpi_data_node(fwnode)->parent;
 	}
 	if (is_acpi_device_node(fwnode)) {
@@ -1703,7 +1703,19 @@ acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
 static struct fwnode_handle *
 acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
 {
-	return acpi_node_get_parent(fwnode);
+	struct fwnode_handle *parent;
+	const char *name;
+
+	parent = acpi_node_get_parent(fwnode);
+	if (!is_acpi_data_node(parent))
+		return parent;
+
+	name = to_acpi_data_node(parent)->name;
+	if (!strcmp(name, "ports") || !strcmp(name, "in-ports") ||
+	    !strcmp(name, "out-ports"))
+		return acpi_node_get_parent(parent);
+
+	return parent;
 }
 
 static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
-- 
2.43.0