Hi
Names of V4L2 device nodes keep on varying depending on target, on some
targets, the device node assigned to my device is /dev/video21 and on some
it is /dev/video15. In order to determine my device, i am opening it,
reading the capabilities, enumerating its formats and then chose the one
matching my requirements. This is impacting start-up latency. One way to
resolve this without impacting start-up latency is to give custom name to
my V4L2 device node (/dev/custom_name instead of /dev/video21). This needs
following change in V4L2 framework. Please review this patch. If you have
faced similar problem please let me know.
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -676,7 +676,8 @@ int __video_register_device(struct video_device *vdev,
int type, int nr,
vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
if (vdev->parent)
vdev->dev.parent = vdev->parent;
- dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
+ if (!dev_name(&vdev->dev))
+ dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
ret = device_register(&vdev->dev);
if (ret < 0) {
printk(KERN_ERR "%s: device_register failed\n", __func__);
Thanks
Vinay
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