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5e4031a5f6
Add support to NXP GPIO expanders pcal6408, documented at [1], and pcal6416, documented at [2]. [1] https://www.nxp.com/docs/en/data-sheet/PCAL6408A.pdf [2] https://www.nxp.com/docs/en/data-sheet/PCAL6416A.pdf Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com> Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>