i2c: mux: pca954x: verify the device id of the pca984x chips
Make sure to not disallow the chips on adapters that are not capable of reading the device id, but also make sure to check the device id before writing to the chip. Tested-by: NAdrian Fiergolski <adrian.fiergolski@cern.ch> Signed-off-by: NPeter Rosin <peda@axentia.se>
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