serial/arc-uart: Miscll DT related updates (Grant's review comments)

-replace "baud" with "current-speed"
-if uart alias doesn't exist in DT, don't abort, pick 0

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 6 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/tty/serial/arc-uart.txt b/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
index c3bd8f9c9997..5cae2eb686f8 100644
--- a/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
+++ b/Documentation/devicetree/bindings/tty/serial/arc-uart.txt
@@ -5,7 +5,7 @@ Required properties:
 - reg                   : offset and length of the register set for the device.
 - interrupts            : device interrupt
 - clock-frequency       : the input clock frequency for the UART
-- baud                  : baud rate for UART
+- current-speed         : baud rate for UART
 
 e.g.
 
@@ -14,7 +14,7 @@ arcuart0: serial@c0fc1000 {
         reg = <0xc0fc1000 0x100>;
         interrupts = <5>;
         clock-frequency = <80000000>;
-        baud = <115200>;
+        current-speed = <115200>;
         status = "okay";
 };
 
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 6f7eadc424a3..d97e194b6bc5 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -547,8 +547,8 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
                 }
                 uart->port.uartclk = val;
 
-                if (of_property_read_u32(np, "baud", &val)) {
-                        dev_err(&pdev->dev, "baud property NOT set\n");
+                if (of_property_read_u32(np, "current-speed", &val)) {
+                        dev_err(&pdev->dev, "current-speed property NOT set\n");
                         return -EINVAL;
                 }
                 uart->baud = val;
@@ -694,10 +694,8 @@ static int arc_serial_probe(struct platform_device *pdev)
                 return -ENODEV;
 
         dev_id = of_alias_get_id(np, "serial");
-        if (dev_id < 0) {
-                dev_err(&pdev->dev, "failed to get alias id: %d\n", dev_id);
-                return dev_id;
-        }
+        if (dev_id < 0)
+                dev_id = 0;
 
         rc = arc_uart_init_one(pdev, dev_id);
         if (rc)