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>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index e9d6d5bdd300..cdb6574d25a6 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -36,6 +36,7 @@ static const struct i2c_device_id pca953x_id[] = {
         { "pca9539", 16, },
         { "pca9554", 8, },
         { "pca9555", 16, },
+        { "pca9556", 8, },
         { "pca9557", 8, },
 
         { "max7310", 8, },