[PATCH v5 5/7] usb: onboard-hub: Bail out if peer hub is already probed

[Venkatesh Yadav Abbarapu]

The .bind function is implemented to bind the correct
"half" of the hub that the driver wants to bind,
and returning -ENODEV for the other "half".

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
---
 common/usb_onboard_hub.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/common/usb_onboard_hub.c b/common/usb_onboard_hub.c
index ba58ff8c10..e7ff86727d 100644
--- a/common/usb_onboard_hub.c
+++ b/common/usb_onboard_hub.c
@@ -178,6 +178,26 @@ err:
 	return ret;
 }
 
+static int usb_onboard_hub_bind(struct udevice *dev)
+{
+	struct ofnode_phandle_args phandle;
+	const void *fdt = gd->fdt_blob;
+	int ret, off;
+
+	ret = dev_read_phandle_with_args(dev, "peer-hub", NULL, 0, 0, &phandle);
+	if (ret)  {
+		dev_err(dev, "peer-hub not specified\n");
+		return ret;
+	}
+
+	off = ofnode_to_offset(phandle.node);
+	ret = fdt_node_check_compatible(fdt, off, "usb424,5744");
+	if (!ret)
+		return 0;
+
+	return -ENODEV;
+}
+
 static int usb_onboard_hub_remove(struct udevice *dev)
 {
 	struct onboard_hub *hub = dev_get_priv(dev);
@@ -217,6 +237,7 @@ static const struct udevice_id usb_onboard_hub_ids[] = {
 U_BOOT_DRIVER(usb_onboard_hub) = {
 	.name	= "usb_onboard_hub",
 	.id	= UCLASS_USB_HUB,
+	.bind   = usb_onboard_hub_bind,
 	.probe = usb_onboard_hub_probe,
 	.remove = usb_onboard_hub_remove,
 	.of_match = usb_onboard_hub_ids,
-- 
2.17.1