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: Will Newton <will.newton@imgtec.com>
Cc: "eric miao" <eric.miao@marvell.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, 3 insertions, 1 deletions

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 5a99e81d2784..93f916720b13 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -30,6 +30,8 @@ static const struct i2c_device_id pca953x_id[] = {
         { "pca9537", 4, },
         { "pca9538", 8, },
         { "pca9539", 16, },
+        { "pca9555", 16, },
+        { "pca9557", 8, },
         /* REVISIT several pca955x parts should work here too */
         { }
 };
@@ -193,7 +195,7 @@ static int __devinit pca953x_probe(struct i2c_client *client,
 {
         struct pca953x_platform_data *pdata;
         struct pca953x_chip *chip;
-        int ret, i;
+        int ret;
 
         pdata = client->dev.platform_data;
         if (pdata == NULL)