serial: of_serial: Support big-endian register accesses

If the device node has a "big-endian" property and 32-bit registers, tell
the serial driver to use UPIO_MEM32BE instead of UPIO_MEM32.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 33fb94f78967..e15c443b2a3c 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -115,7 +115,8 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
                         port->iotype = UPIO_MEM;
                         break;
                 case 4:
-                        port->iotype = UPIO_MEM32;
+                        port->iotype = of_device_is_big_endian(np) ?
+                                       UPIO_MEM32BE : UPIO_MEM32;
                         break;
                 default:
                         dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",