[PATCH 3/4] media: ov8865: Improve error logging when fwnode is not found

[Hans de Goede <hansg@kernel.org>]

From: Hans de Goede <hdegoede@redhat.com>

The ov8865 driver waits for the endpoint fwnode to show up in case this
fwnode is created by a bridge-driver.

It does this by returning -EPROBE_DEFER, but it does not use
dev_err_probe() so no reason for deferring gets registered.

After 30 seconds the kernel logs a warning that the probe is still
deferred, which looks like this:

[   33.952061] i2c i2c-INT347A:00: deferred probe pending: (reason unknown)

Use dev_err_probe() when returning -EPROBE_DEFER to register the probe
deferral reason changing the error to:

deferred probe pending: waiting for fwnode graph endpoint

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/media/i2c/ov8865.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c
index 95ffe7536aa6..a2138f7988aa 100644
--- a/drivers/media/i2c/ov8865.c
+++ b/drivers/media/i2c/ov8865.c
@@ -2991,7 +2991,8 @@ static int ov8865_probe(struct i2c_client *client)
 
 	handle = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
 	if (!handle)
-		return -EPROBE_DEFER;
+		return dev_err_probe(dev, -EPROBE_DEFER,
+				     "waiting for fwnode graph endpoint\n");
 
 	sensor->endpoint.bus_type = V4L2_MBUS_CSI2_DPHY;
 
-- 
2.49.0