tty: serial: msm_serial: Use DT aliases

We rely on probe order of this driver to determine the line number for
the uart port. This makes it impossible to know the line number
when these devices are populated via DT. Use the DT alias
mechanism to assign the line based on the aliases node.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index b507f5a16c1c9d8e20025822b0e9f14bd3c10669..09364dd8cf3a2ca3f37b0913ccb6271c5f5657a9 100644 (file)
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -1044,17 +1044,22 @@ static int msm_serial_probe(struct platform_device *pdev)
        struct resource *resource;
        struct uart_port *port;
        const struct of_device_id *id;
-       int irq;
+       int irq, line;
 
        if (pdev->id == -1)
                pdev->id = atomic_inc_return(&msm_uart_next_id) - 1;
 
-       if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))
+       if (pdev->dev.of_node)
+               line = of_alias_get_id(pdev->dev.of_node, "serial");
+       else
+               line = pdev->id;
+
+       if (unlikely(line < 0 || line >= UART_NR))
                return -ENXIO;
 
-       dev_info(&pdev->dev, "msm_serial: detected port #%d\n", pdev->id);
+       dev_info(&pdev->dev, "msm_serial: detected port #%d\n", line);
 
-       port = get_port_from_line(pdev->id);
+       port = get_port_from_line(line);
        port->dev = &pdev->dev;
        msm_port = UART_TO_MSM(port);