serial: ns16550: use DIV_ROUND_CLOSEST macro to compute the divisor

The function still returns the same value.

The comment block is no longer necessary because our intention is
clear enough by using DIV_ROUND_CLOSEST() macro.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 056ef2a..49e2c1f 100644 (file)
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -130,13 +130,9 @@ static int calc_divisor (NS16550_t port)
 #endif
 
 #define MODE_X_DIV 16
-       /* Compute divisor value. Normally, we should simply return:
-        *   CONFIG_SYS_NS16550_CLK) / MODE_X_DIV / gd->baudrate
-        * but we need to round that value by adding 0.5.
-        * Rounding is especially important at high baud rates.
-        */
-       return (CONFIG_SYS_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
-               (MODE_X_DIV * gd->baudrate);
+
+       return DIV_ROUND_CLOSEST(CONFIG_SYS_NS16550_CLK,
+                                               MODE_X_DIV * gd->baudrate);
 }
 
 void