[U-Boot] [PATCH] rtc: pcf8563: Make century compatible with Linux

Wolfgang Denk
2012-09-02T15:31:12Z

Dear Beno?t Th?baudeau,

In message <2136837803.335794.1342793136811.JavaMail.root@advansee.com> you wrote:
> This driver uses the century bit of this RTC in the opposite way Linux does> .
> From Linux's rtc-pcf8563.c:
> /*
> * The meaning of MO_C bit varies by the chip type.
> * From PCF8563 datasheet: this bit is toggled when the years
> * register overflows from 99 to 00
> * 0 indicates the century is 20xx
> * 1 indicates the century is 19xx
> * From RTC8564 datasheet: this bit indicates change of
> * century. When the year digit data overflows from 99 to 00,
> * this bit is set. By presetting it to 0 while still in the
> * 20th century, it will be set in year 2000, ...
> * There seems no reliable way to know how the system use this
> * bit. So let's do it heuristically, assuming we are live in
> * 1970...2069.
> */
>
> As U-Boot's PCF8563 driver does not say it is supposed to support the RTC85> 64,
> make this driver compatible with Linux's by giving the opposite meaning to > the
> century bit.
>
> Signed-off-by: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> Cc: Wolfgang Denk <wd@denx.de>
> ---
> .../drivers/rtc/pcf8563.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

Applied, thanks.

Best regards,

Wolfgang Denk

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