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>

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 5a99e81d27843c8ce9e376684196b5daa253f90a..93f916720b139e40b20591839126609db0e778a0 100644 (file)
--- 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)