Re: [PATCH 1/3] i2c: adv748x: store number of CSI-2 lanes described in device tree

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Hi Laurent,

On Fri, Sep 21, 2018 at 01:01:09PM +0300, Laurent Pinchart wrote:
...
> > There is also the oddball one of the TC358743 which dynamically
> > switches the number of lanes in use based on the data rate required.
> > That's probably a separate discussion, but is currently dealt with via
> > g_mbus_config as amended back in Sept 2017 [1].
> 
> This falls into the case of dynamic configuration discovery and negotiation I 
> mentioned above, and we clearly need to make sure the v4l2_subdev API supports 
> this use case.

This could be added to struct v4l2_mbus_frame_desc; Niklas has driver that
uses the framework support here, so this would likely end up merged soon:

<URL:https://git.linuxtv.org/sailus/media_tree.git/tree/include/media/v4l2-subdev.h?h=vc&id=0cbd2b25b37ef5b2e6a14340dbca6d2d2d5af98e>

The CSI-2 bus parameters are missing there currently but nothing prevents
adding them. The semantics of set_frame_desc() needs to be probably defined
better than it currently is.

-- 
Regards,

Sakari Ailus
e-mail: sakari.ailus@xxxxxx



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