serial: samsung: Register cpufreq notifier only on S3C24xx

The Samsung serial driver registered for CPU frequency transitions to
recalculate its clock when ARM clock frequency changes.  This is needed
only on S3C24xx platform so limit the ifdef to respective cpufreq
driver.

On S3C24xx the ratio ratio between frequencies of UART's parent clock
(pclk) and ARM's parent clock (fclk) remains fixed.  Therefore when ARM
clock frequency goes down, the serial is also affected.

Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index ae2095a66708e0b06bf05bfe38d4a0901b158d3d..f44615fa474de233748b4f72133b8bf3fc272bf5 100644 (file)
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1577,7 +1577,7 @@ static void s3c24xx_serial_resetport(struct uart_port *port,
 }
 
 
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
 
 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
                                             unsigned long val, void *data)

diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 2ae4fcee181458ce008c499b266e1e7ecd3d614f..a04acef1cb20f0f80cf18d08be3a6fbba409b946 100644 (file)
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -102,7 +102,7 @@ struct s3c24xx_uart_port {
 
        struct s3c24xx_uart_dma         *dma;
 
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
        struct notifier_block           freq_transition;
 #endif
 };