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: NKevin Cernekee <cernekee@gmail.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NRob Herring <robh@kernel.org>

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",