gpio: pca953x driver handles pca9554 too
Teach drivers/gpio/pca953x.c about PCA9554, another compatible chip. Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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