linux-kernel - [PATCH] rtc: pcf85063: remove useless century handling

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Message-Id: <1456268728-343-1-git-send-email-alexandre.belloni@free-electrons.com>
Date:	Wed, 24 Feb 2016 00:05:28 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	rtc-linux@...glegroups.com
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Juergen Borleis <jbe@...gutronix.de>,
	linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] rtc: pcf85063: remove useless century handling

pcf85063_get_datetime() tries to handle a century bit but that bit is not
documented and the final value is never used anywhere else in the kernel.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/rtc/rtc-pcf85063.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index c5db231f14de..2b3b99b094b5 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -31,13 +31,10 @@
 #define PCF85063_REG_MO			0x09
 #define PCF85063_REG_YR			0x0A
 
-#define PCF85063_MO_C			0x80 /* century */
-
 static struct i2c_driver pcf85063_driver;
 
 struct pcf85063 {
 	struct rtc_device *rtc;
-	int c_polarity;	/* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
 	int voltage_low; /* indicates if a low_voltage was detected */
 };
 
@@ -103,9 +100,6 @@ static int pcf85063_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 	tm->tm_year = bcd2bin(regs[6]);
 	if (tm->tm_year < 70)
 		tm->tm_year += 100;	/* assume we are in 1970...2069 */
-	/* detect the polarity heuristically. see note above. */
-	pcf85063->c_polarity = (regs[5] & PCF85063_MO_C) ?
-		(tm->tm_year >= 100) : (tm->tm_year < 100);
 
 	return rtc_valid_tm(tm);
 }
-- 
2.7.0