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Hey Gerrit!

 GK> Any ideas what I might be missing here?

  $ zgrep PCA953 /proc/config.gz
  CONFIG_GPIO_PCA953X=m
  # CONFIG_GPIO_PCA953X_IRQ is not set
  CONFIG_LEDS_PCA9532=m
  # CONFIG_LEDS_PCA9532_GPIO is not set

Note that in my case they are turned off and therefore the kernel reports no
device or chip found especially considering I don't have said chipset. 
However even if I did it should still report no device or chip found.

Turning on the PCA953X (modular or builtin) should help your cause and is the
only idea I can come up with not knowing if your kernel is actually PCA953X
capable.

Life is good,
Maurice

... Meotud ana wat hwær se cwealm cymeþ, þe heonon of cyþþe gewiteþ.
    Only God knows where plague goes when it departs from a place.
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