How to implement i2c map device

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Hi Laurent,

I'm writing a driver for adv7842 video decoder. This chip has 12 i2c
register maps. IO map is fixed to 0x20 and others are configurable.
I plan to use 0x20 as the subdevice addr to call
v4l2_i2c_new_subdev_board, and call i2c_new_device and i2c_add_driver
in i2c_probe to enumerate other i2c maps. Is it acceptable or any
other suggestion?

By the way, HDMI support seems under discussion, is there any
framework or guide now?

Thanks,
Scott
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