gpio: pca953x: add support for pca9555 I2C I/O expander
Add support for pca9555 I2C I/O expander. As the comment suggests this part is software compatible with the pca9539. Signed-off-by: NWill Newton <will.newton@imgtec.com> Cc: "eric miao" <eric.miao@marvell.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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