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>
---
 drivers/gpio/pca953x.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 6e72fd3..4ff274f 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -36,6 +36,7 @@ static const struct pca953x_desc pca953x_descs[] = {
 	{ "pca9537", 4, },
 	{ "pca9538", 8, },
 	{ "pca9539", 16, },
+	{ "pca9555", 16, },
 	/* REVISIT several pca955x parts should work here too */
 };

-- 
1.5.5.1