[PATCH v5 13/14] media: mt9m114: Return -EPROBE_DEFER if no endpoint is found

[Hans de Goede]

With IPU# bridges, endpoints may only be created when the IPU bridge is
initialized. This may happen after the sensor driver's first probe().

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Hans de Goede <johannes.goede@xxxxxxxxxxxxxxxx>
---
Changes in v4:
- Update comment about why EPROBE_DEFER handling is necessary
---
 drivers/media/i2c/mt9m114.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c
index 18fcf1a105a4268a501f517a155f12def0753929..9712d61ab9512f3b8ff31423afb81b61bc3bdaef 100644
--- a/drivers/media/i2c/mt9m114.c
+++ b/drivers/media/i2c/mt9m114.c
@@ -2460,11 +2460,17 @@ static int mt9m114_parse_dt(struct mt9m114 *sensor)
 	struct fwnode_handle *ep;
 	int ret;
 
+	/*
+	 * On ACPI systems the fwnode graph can be initialized by a bridge
+	 * driver, which may not have probed yet. Wait for this.
+	 *
+	 * TODO: Return an error once bridge driver code will have moved
+	 * to the ACPI core.
+	 */
 	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
-	if (!ep) {
-		dev_err(&sensor->client->dev, "No endpoint found\n");
-		return -EINVAL;
-	}
+	if (!ep)
+		return dev_err_probe(&sensor->client->dev, -EPROBE_DEFER,
+				     "waiting for fwnode graph endpoint\n");
 
 	sensor->bus_cfg.bus_type = V4L2_MBUS_UNKNOWN;
 	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &sensor->bus_cfg);

-- 
2.52.0