Bluetooth: hci_sync: Add fallback-bd-address prop

The kernel Bluetooth framework understands that devices may not
be programmed with valid Bluetooth addresses. It also has the ability
to override a Bluetooth address with the value of the local-bd-address
DT property, but it ignores the validity of the existing address when
doing so.

Add a new boolean property, fallback-bd-address, which indicates that
the given local-bd-address property should only be used if the device
does not already have a valid BDADDR.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

net/bluetooth/hci_sync.c

@@ -4540,6 +4540,7 @@ static const struct {
  */
 static int hci_dev_setup_sync(struct hci_dev *hdev)
 {
+	struct fwnode_handle *fwnode = dev_fwnode(hdev->dev.parent);
 	int ret = 0;
 	bool invalid_bdaddr;
 	size_t i;
@@ -4568,7 +4569,9 @@ static int hci_dev_setup_sync(struct hci_dev *hdev)
 
 	if (!ret) {
 		if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks) &&
-		    !bacmp(&hdev->public_addr, BDADDR_ANY))
+		    !bacmp(&hdev->public_addr, BDADDR_ANY) &&
+		    (invalid_bdaddr ||
+		     !fwnode_property_present(fwnode, "fallback-bd-address")))
 			hci_dev_get_bd_addr_from_property(hdev);
 
 		if ((invalid_bdaddr ||