Em Fri, 6 Oct 2017 13:22:29 +0300
Sakari Ailus <sakari.ailus@xxxxxx> escreveu:
> > + Bridge driver
> > + The same as V4L2 main driver.
>
> Not all V4L2 main drivers can be bridge drivers. Mem-to-mem devices, for
> instance. How about:
>
> A driver for a device receiving image data from another device (or
> transmitting it to a sub-device) controlled by a sub-device driver. Bridge
> drivers typically act as V4L2 main drivers.
That is not true for some device drivers we have.
The GSPCA drivers are bridge drivers, but they don't use any sub-device
(well, it should, but nobody will redesign it, as the efforts would
be huge, for a very little gain). Also uvcdriver doesn't need sub-device
drivers, as the camera's internal firmware does the interface with the
sensors.
We could, instead define it as:
Bridge driver
A driver that provides a bridge between the CPU's bus to the
data and control buses of a media hardware. Often, the
bridge driver is the same as V4L2 main driver.
Thanks,
Mauro
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