• Xunlei Pang's avatar
    rtc: NTP: Add CONFIG_RTC_SYSTOHC_DEVICE for NTP synchronization · 9c5150b3
    Xunlei Pang authored
    Currently, CONFIG_RTC_SYSTOHC uses CONFIG_RTC_HCTOSYS_DEVICE which
    is originally used by CONFIG_RTC_HCTOSYS, but this rtc device has
    some limiations, for example, it must be battery-backed, be able
    to work with irq off and through system suspension, etc.
    
    So add CONFIG_RTC_SYSTOHC_DEVICE used exclusively for CONFIG_RTC_SYSTOHC,
    it is more lenient compared to CONFIG_RTC_HCTOSYS_DEVICE, and could
    be assigned any available RTC in the system.
    
    Default value is CONFIG_RTC_HCTOSYS_DEVICE which is "rtc0" by default.
    After this patch, NTP will sync up "rtc0" by default.
    
    Cc: Paul Bolle <pebolle@tiscali.nl>
    Signed-off-by: default avatarXunlei Pang <pang.xunlei@linaro.org>
    Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
    9c5150b3
Kconfig 45 KB