Re: [PATCH v7 1/7] media: add glossary.rst with a glossary of terms used at V4L2 spec

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On Tue, Oct 10, 2017 at 05:30:04AM -0300, Mauro Carvalho Chehab wrote:
> 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.

Looks good to me.

-- 
Sakari Ailus
e-mail: sakari.ailus@xxxxxx



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