[U-Boot] [PATCH 02/13] mailbox: allow subnode for mbox regs

[Michal Simek]

From: Ibai Erkiaga <ibai.erkiaga-elorza at xilinx.com>

The following patch allows the mailbox node in DT to host subnodes with
mailbox definitions. If the client phandle to the mailbox is not the
mailbox driver node, just checks parents as well.

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 drivers/mailbox/mailbox-uclass.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/mailbox-uclass.c b/drivers/mailbox/mailbox-uclass.c
index 809f26b20258..9fdb6279e4f3 100644
--- a/drivers/mailbox/mailbox-uclass.c
+++ b/drivers/mailbox/mailbox-uclass.c
@@ -49,7 +49,16 @@ int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
 	if (ret) {
 		debug("%s: uclass_get_device_by_of_offset failed: %d\n",
 		      __func__, ret);
-		return ret;
+
+		/* Test with parent node */
+		ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX,
+						  ofnode_get_parent(args.node),
+						  &dev_mbox);
+		if (ret) {
+			debug("%s: mbox node from parent failed: %d\n",
+			      __func__, ret);
+			return ret;
+		};
 	}
 	ops = mbox_dev_ops(dev_mbox);
 
-- 
2.17.1