rtc: pcf8563 fix: return -EINVAL if we read an invalid time.

Return -EINVAL if the voltage low bit is set to avoid getting a bogus
time at boot.
There was a comment stating that util-linux hwclock refuses to set a
new time if we return an error code on read, but at least the current
version do set the time as expected. Remove the comment and the check
for valid time, and let the rtc core check it for us.

Signed-off-by: Jan Kardell <jan.kardell@telliq.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 0ba7e59929beab93b53c2a0d35a9c49b4cf562c5..229426dee1eaa0a6f16c2dcee0964482f823c0d5 100644 (file)
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -22,7 +22,7 @@
 #include <linux/of.h>
 #include <linux/err.h>
 
-#define DRV_VERSION "0.4.3"
+#define DRV_VERSION "0.4.4"
 
 #define PCF8563_REG_ST1                0x00 /* status */
 #define PCF8563_REG_ST2                0x01
@@ -202,8 +202,9 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 
        if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
                pcf8563->voltage_low = 1;
-               dev_info(&client->dev,
+               dev_err(&client->dev,
                        "low voltage detected, date/time is not reliable.\n");
+               return -EINVAL;
        }
 
        dev_dbg(&client->dev,
@@ -234,12 +235,6 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
                tm->tm_sec, tm->tm_min, tm->tm_hour,
                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 
-       /* the clock can give out invalid datetime, but we cannot return
-        * -EINVAL otherwise hwclock will refuse to set the time on bootup.
-        */
-       if (rtc_valid_tm(tm) < 0)
-               dev_err(&client->dev, "retrieved date/time is not valid.\n");
-
        return 0;
 }