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Kevin,
As Clemens said, can you be more specific on what kind of help you need?
Regards,
Eric Hackett
searching google: https://github.com/torvalds/linux/blob/master/drivers/gpio/gpio-pca953x.c
This driver seems to include PCAL6524 which should be similar enough to use with the 6424 device.
Google searching TCA6424A Linux driver: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/804240/tca6424a-tca6424a-linux-driver
This seems to have already been asked.
-Bobby