camera subdevice support was Re: [PATCH 1/4] v4l2: device_register_subdev_nodes: allow calling multiple times

Pavel Machek
2017-02-25T21:53:27Z

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Hi!

> > Ok, I got the camera sensor to work. No subdevices support, so I don't
> > have focus (etc) working, but that's a start. I also had to remove
> > video-bus-switch support; but I guess it will be easier to use
> > video-multiplexer patches...
> >
> > I'll have patches over weekend.
>
> I briefly looked at what's there --- you do miss the video nodes for the
> non-sensor sub-devices, and they also don't show up in the media graph,
> right?

Yes.

> I guess they don't end up matching in the async list.

How should they get to the async list?

> I think we need to make the non-sensor sub-device support more generic;
> it's not just the OMAP 3 ISP that needs it. I think we need to document
> the property for the flash phandle as well; I can write one, or refresh
> an existing one that I believe already exists.
>
> How about calling it either simply "flash" or "camera-flash"? Similarly
> for lens: "lens" or "camera-lens". I have a vague feeling the "camera-"
> prefix is somewhat redundant, so I'd just go for "flash" or "lens".

Actually, I'd go for "flash" and "focus-coil". There may be other
lens properties, such as zoom, mirror movement, lens identification,
...

> At the very least the property names must be generic (not hardware
> dependent) as this kind of functionality should be present in the
> framework rather than in individual drivers. That'll be for later
> though.

Agreed, that would be nice.

> Making the sub-device bus configuration a pointer should be in a separate
> patch. It makes sense since the entire configuration is not valid for all
> sub-devices attached to the ISP anymore. I think it originally was a
> separate patch, but they probably have been merged at some point. I can't
> find it right now anyway.

I believe I can find the patch. But I'm not sure if I can port it to
the fwnode infrastructure anytime soon...