controls, subdevs, and media framework

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I'm trying to understand how the media framework and V4L2 share the responsibility of configuring a video device.  Referring to the ISP code on Laurent's media-0004-omap3isp branch, the video device is now split up into several devices... suppose you have a sensor delivering raw bayer data to the CCDC.  I could get this raw data from the /dev/video2 device (named "OMAP3 ISP CCDC output") or I could get YUV data from the previewer or resizer.  But I would no longer have a single device where I could ENUM_FMT and see that I could get either.  Correct?

Having settled on a particular video device, (how) do regular controls (ie. VIDIOC_[S|G]_CTRL) work?  I don't see any support for them in ispvideo.c.  Is it just yet to be implemented?  Or is it expected that the application will access the subdevs individually?

Basically the same Q for CROPCAP:  isp_video_cropcap passes it on to the last link in the chain, but none of the subdevs in the ISP currently have a cropcap function implemented (yet).  Does this still need to be written?

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Michael Jones

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