I2c driver is not probed

Hello,
I want to implement driver for focuser in sensor.
when I add focuser under sensor in device tree, device driver probe function is not called. (case 1)
I move focuser underneath i2c@318000, device driver is probed (case 2)
how can I driver probed in case 1

sensor driver uses tegra camera platform
L4T 35.5.0

case1: device tree (not probed)

 i2c@318000{
   sensor@1a {
     ...
     focuser@0f{
       ...
     }
   }
}

case2: device tree (probed)

 i2c@318000{
   sensor@1a {
     ...
   }
   focuser@0f{
     ...
   }
}

Current L4T don’t support focuser.
And under the i2c@318000 scope are the right place for kernel driver.

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