platform/x86/intel_cht_int33fe: Add displayport altmode fwnode to the connector fwnode

Add a displayport altmode fwnode to the usb-connector fwnode,
devices which use this driver support display-port altmode through
the PI3USB30532 USB switch, this enables support for this.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210409134033.105834-4-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/platform/x86/intel_cht_int33fe_typec.c

@@ -124,12 +124,31 @@ static const struct software_node usb_connector_node = {
 	.properties = usb_connector_properties,
 };
 
+static const struct software_node altmodes_node = {
+	.name = "altmodes",
+	.parent = &usb_connector_node,
+};
+
+static const struct property_entry dp_altmode_properties[] = {
+	PROPERTY_ENTRY_U32("svid", 0xff01),
+	PROPERTY_ENTRY_U32("vdo", 0x0c0086),
+	{ }
+};
+
+static const struct software_node dp_altmode_node = {
+	.name = "displayport-altmode",
+	.parent = &altmodes_node,
+	.properties = dp_altmode_properties,
+};
+
 static const struct software_node *node_group[] = {
 	&fusb302_node,
 	&max17047_node,
 	&pi3usb30532_node,
 	&displayport_node,
 	&usb_connector_node,
+	&altmodes_node,
+	&dp_altmode_node,
 	NULL
 };