tuner and PAL decoder - runtime suspend

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I'm trying to develop the tda9885 poweron + setting paramteres driver,
using the v4l2 structure, that feeds a tvp5151.
I can declare a tvp5151 input as V4L2_INPUT_TYPE_TUNER and than create
a v4l2 subdev driver for tda9885.
I don't know if I need to put code in tvp5151 driver in order to
trigger the tda9885 power on + setting parameters
(v4l2_device_call_all), or if there is an automatic way (I think so)
to do it.
Finally I'll add runtime suspend and resume code for tda9885 and tvp5151.
Is there any recommendation to do this in the right way?

Thx,
Raffaele
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