[RESEND][omap3camera] How does a lens subdevice get powered up?

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(Resending as plain text, as I sent it originally as HTML and
got rejected by ML security policies)

Hi Laurent,

I see that usually a sensor is powered up on attempting a
VIDIOC_STREAMON at the capture endpoint of the pipeline,
in which the sensor is linked.

Now, what I don't understand quite well is, the Lens driver
is a separate subdevice, BUT it's obviously not linked to the
sensor, nor the pipeline.

How would the lens driver know when to power up?

Regards,
Sergio
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