omap-serial: Use default clock speed (48Mhz) if not specified

Use a default clock speed of 48Mhz, instead of ending up with 0,
if platforms fail to specify a valid clock speed.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 1baf24b96469..c5b545f19a16 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -43,6 +43,8 @@
 #include <plat/dmtimer.h>
 #include <plat/omap-serial.h>
 
+#define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
+
 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 
 /* Forward declaration of functions */
@@ -1387,6 +1389,11 @@ static int serial_omap_probe(struct platform_device *pdev)
 
         up->port.flags = omap_up_info->flags;
         up->port.uartclk = omap_up_info->uartclk;
+        if (!up->port.uartclk) {
+                up->port.uartclk = DEFAULT_CLK_SPEED;
+                dev_warn(&pdev->dev, "No clock speed specified: using default:"
+                                                "%d\n", DEFAULT_CLK_SPEED);
+        }
         up->uart_dma.uart_base = mem->start;
         up->errata = omap_up_info->errata;