[PATCH 07/14] media: soc-camera: support deferred probing of clients

[Barry Song]

2013/4/10 Guennadi Liakhovetski <g.liakhovetski at gmx.de>:
> On Wed, 10 Apr 2013, Barry Song wrote:
>
>> 2013/4/10 Guennadi Liakhovetski <g.liakhovetski at gmx.de>:
>> > On Wed, 10 Apr 2013, Barry Song wrote:
>
> [snip]
>
>> >> > This cannot work, because some I2C devices, e.g. sensors, need a clock
>> >> > signal from the camera interface to probe. Before the bridge driver has
>> >> > completed its probing and registered a suitable clock source with the
>> >> > v4l2-clk framework, sensors cannot be probed. And no, we don't want to
>> >> > fake successful probing without actually being able to talk to the
>> >> > hardware.
>> >>
>> >> i'd say same dependency also exists on ASoC.  a "fake" successful
>> >> probing doesn't mean it should really begin to work if there is no
>> >> external trigger source.  ASoC has successfully done that by a machine
>> >> driver to connect all DAI.
>> >> a way is we put all things ready in their places, finally we connect
>> >> them together and launch the whole hardware flow.
>> >>
>> >> anyway, if you have maken the things work by some simple hacking and
>> >> that means minimial changes to current soc-camera, i think we can
>> >> follow.
>> >
>> > If you want to volunteer to step up as a new soc-camera maintainer to
>> > replace my simple hacking with your comprehencive and advanced designs -
>> > feel free, I'll ack straight away.
>>
>> i am not sure whether you agree the new way or not. if you also agree
>> this is a better way,
>
> In fact I don't.
>
>> i think we can do something to move ahead. i
>> need sync and get input from you expert :-)
>
> I suggest you read all the mailing list discussions of these topics over
> last months / years, conference discussion protocols instead of restarting
> a beaten to death topic at the v8 time-frame.

you think it has been dead but i think it is still alive since there
are still sombody like me starting a beaten for that.
anyway,  it doesn't really matter too much.
i can definitely follow what you like as you have succefully built a
good soc-camera system.

>
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/

-barry