[PATCH 4.4 061/113] serial: imx: restore handshaking irq for imx1

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>

commit 7e620984b62532783912312e334f3c48cdacbd5d upstream.

Back in 2015 when irda was dropped from the driver imx1 was broken. This
change reintroduces the support for the third interrupt of the UART.

Fixes: afe9cbb1a6ad ("serial: imx: drop support for IRDA")
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>
Reviewed-by: Leonard Crestez <leonard.cres...@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/tty/serial/imx.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1997,6 +1997,14 @@ static int serial_imx_probe(struct platf
                                       dev_name(&pdev->dev), sport);
                if (ret)
                        return ret;
+
+               ret = devm_request_irq(&pdev->dev, rtsirq, imx_rtsint, 0,
+                                      dev_name(&pdev->dev), sport);
+               if (ret) {
+                       dev_err(&pdev->dev, "failed to request rts irq: %d\n",
+                               ret);
+                       return ret;
+               }
        } else {
                ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0,
                                       dev_name(&pdev->dev), sport);