Fix trivial typo.

Signed-off-by: Axel Lin <axel....@ingics.com>
---
 drivers/serial/ns16550.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index eb00f1c..03beab5 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -80,7 +80,7 @@ static inline int serial_in_shift(unsigned char *addr, int 
shift)
 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
        return in_be32(addr);
 #elif defined(CONFIG_SYS_BIG_ENDIAN)
-       return readb(addr + (1 << reg_shift) - 1);
+       return readb(addr + (1 << shift) - 1);
 #else
        return readb(addr);
 #endif
-- 
1.9.1



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