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media: imx: csi: Register a subdev notifier 

Parse neighbor remote devices on the CSI port, and add them to a subdev
notifier, by calling v4l2_async_notifier_parse_fwnode_endpoints_by_port()
using the CSI's port id. And register the subdev notifier for the CSI.

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Steve Longerbeam 2018-09-29 15:54:11 -04:00 committed by Mauro Carvalho Chehab
parent c5afc789bf
commit c893500a16
1 changed files with 56 additions and 1 deletions
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57
drivers/staging/media/imx/imx-media-csi.c
View File

@ -1783,6 +1783,61 @@ static const struct v4l2_subdev_internal_ops csi_internal_ops = {
.unregistered = csi_unregistered,
};
static int imx_csi_parse_endpoint(struct device *dev,
struct v4l2_fwnode_endpoint *vep,
struct v4l2_async_subdev *asd)
{
return fwnode_device_is_available(asd->match.fwnode) ? 0 : -EINVAL;
}
static int imx_csi_async_register(struct csi_priv *priv)
{
struct v4l2_async_notifier *notifier;
struct fwnode_handle *fwnode;
unsigned int port;
int ret;
notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
if (!notifier)
return -ENOMEM;
v4l2_async_notifier_init(notifier);
fwnode = dev_fwnode(priv->dev);
/* get this CSI's port id */
ret = fwnode_property_read_u32(fwnode, "reg", &port);
if (ret < 0)
goto out_free;
ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
priv->dev->parent, notifier, sizeof(struct v4l2_async_subdev),
port, imx_csi_parse_endpoint);
if (ret < 0)
goto out_cleanup;
ret = v4l2_async_subdev_notifier_register(&priv->sd, notifier);
if (ret < 0)
goto out_cleanup;
ret = v4l2_async_register_subdev(&priv->sd);
if (ret < 0)
goto out_unregister;
priv->sd.subdev_notifier = notifier;
return 0;
out_unregister:
v4l2_async_notifier_unregister(notifier);
out_cleanup:
v4l2_async_notifier_cleanup(notifier);
out_free:
kfree(notifier);
return ret;
}
static int imx_csi_probe(struct platform_device *pdev)
{
struct ipu_client_platformdata *pdata;
@ -1852,7 +1907,7 @@ static int imx_csi_probe(struct platform_device *pdev)
goto free;
}
ret = v4l2_async_register_subdev(&priv->sd);
ret = imx_csi_async_register(priv);
if (ret)
goto free;