rtc: pcf2123: use sign_extend32() for sign extension
Use sign_extend32() instead of open coding sign extension.
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-pcf2123.c b/drivers/rtc/rtc-pcf2123.c
index f22e060..b4478cc 100644
--- a/drivers/rtc/rtc-pcf2123.c
+++ b/drivers/rtc/rtc-pcf2123.c
@@ -96,7 +96,7 @@
#define CD_TMR_TE BIT(3) /* Countdown timer enable */
/* PCF2123_REG_OFFSET BITS */
-#define OFFSET_SIGN_BIT BIT(6) /* 2's complement sign bit */
+#define OFFSET_SIGN_BIT 6 /* 2's complement sign bit */
#define OFFSET_COARSE BIT(7) /* Coarse mode offset */
#define OFFSET_STEP (2170) /* Offset step in parts per billion */
@@ -217,7 +217,7 @@
if (reg & OFFSET_COARSE)
reg <<= 1; /* multiply by 2 and sign extend */
else
- reg |= (reg & OFFSET_SIGN_BIT) << 1; /* sign extend only */
+ reg = sign_extend32(reg, OFFSET_SIGN_BIT);
*offset = ((long)reg) * OFFSET_STEP;