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Subject: media: ov2680: Wait for endpoint fwnode before continuing with probe()
Author: Hans de Goede <hdego...@redhat.com>
Date: Thu Aug 3 11:33:31 2023 +0200
Defer probe() until the endpoint fwnode is available. This is necessary
on ACPI platforms where the bridge code creating the fwnodes may also e.g.
set the "clock-frequency" device property and add GPIO mappings.
Acked-by: Rui Miguel Silva <rmf...@gmail.com>
Reviewed-by: Daniel Scally <dan.sca...@ideasonboard.com>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>
drivers/media/i2c/ov2680.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/i2c/ov2680.c b/drivers/media/i2c/ov2680.c
index a8c257f3bcd6..d4664581b49b 100644
--- a/drivers/media/i2c/ov2680.c
+++ b/drivers/media/i2c/ov2680.c
@@ -717,10 +717,22 @@ static int ov2680_check_id(struct ov2680_dev *sensor)
static int ov2680_parse_dt(struct ov2680_dev *sensor)
{
struct device *dev = sensor->dev;
+ struct fwnode_handle *ep_fwnode;
struct gpio_desc *gpio;
unsigned int rate = 0;
int i, ret;
+ /*
+ * Sometimes the fwnode graph is initialized by the bridge driver.
+ * Bridge drivers doing this may also add GPIO mappings, wait for this.
+ */
+ ep_fwnode = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
+ if (!ep_fwnode)
+ return dev_err_probe(dev, -EPROBE_DEFER,
+ "waiting for fwnode graph endpoint\n");
+
+ fwnode_handle_put(ep_fwnode);
+
/*
* The pin we want is named XSHUTDN in the datasheet. Linux sensor
* drivers have standardized on using "powerdown" as con-id name
@@ -801,7 +813,7 @@ static int ov2680_probe(struct i2c_client *client)
ret = ov2680_parse_dt(sensor);
if (ret < 0)
- return -EINVAL;
+ return ret;
ret = ov2680_mode_init(sensor);
if (ret < 0)
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