serial/imx: add of_alias_get_id() reference back

As of_alias_get_id() gets fixed and ready for use, the patch adds the
of_alias_get_id() reference back to imx serial driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
[grant.likely: changed pr_err() to dev_err(), dropped unnecessary else]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 7e91b3d368c..99898773706 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1286,17 +1286,20 @@ static int serial_imx_resume(struct platform_device *dev)
 static int serial_imx_probe_dt(struct imx_port *sport,
                 struct platform_device *pdev)
 {
-        static int portnum = 0;
         struct device_node *np = pdev->dev.of_node;
         const struct of_device_id *of_id =
                         of_match_device(imx_uart_dt_ids, &pdev->dev);
+        int ret;
 
         if (!np)
                 return -ENODEV;
 
-        sport->port.line = portnum++;
-        if (sport->port.line >= UART_NR)
-                return -EINVAL;
+        ret = of_alias_get_id(np, "serial");
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
+                return -ENODEV;
+        }
+        sport->port.line = ret;
 
         if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
                 sport->have_rtscts = 1;