drivers/rtc/rtc-isl12057.c: add proper handling of oscillator failure bit

As suggested by Uwe, instead of clearing oscillator failure bit
unconditionally at driver load, this patch adds proper handling of the
flag.  The driver now returns -ENODATA when reading time from the device
and oscillator failure bit is set.  The flag is now cleared only when the
a new time value is pushed to the device.

Signed-off-by: Arnaud Ebalard <[email protected]>
Reported-by: Uwe Kleine-König <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Peter Huewe <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Grant Likely <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions