gpio: pca953x: Add support for PCA9556
PCA9556 is the software-compatible predecessor to the PCA9557, so add it to the supported I2C device ID table. Signed-off-by: Nate Case <ncase@xes-inc.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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