Since the 32K counter is always available, then we can register the persistent clock to compensate the suspend time for the OS time.
Signed-off-by: Baolin Wang <[email protected]> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/timer-ti-32k.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 5e51fcf..3cd136f 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -262,6 +262,7 @@ config CLKSRC_TI_32K bool "Texas Instruments 32.768 Hz Clocksource" if COMPILE_TEST depends on GENERIC_SCHED_CLOCK select TIMER_OF if OF + select PERSISTENT_CLOCK help This option enables support for Texas Instruments 32.768 Hz clocksource available on many OMAP-like platforms. diff --git a/drivers/clocksource/timer-ti-32k.c b/drivers/clocksource/timer-ti-32k.c index 880a861..353ff9d 100644 --- a/drivers/clocksource/timer-ti-32k.c +++ b/drivers/clocksource/timer-ti-32k.c @@ -41,6 +41,7 @@ #include <linux/clocksource.h> #include <linux/of.h> #include <linux/of_address.h> +#include <linux/persistent_clock.h> /* * 32KHz clocksource ... always available, on pretty most chips except @@ -120,6 +121,9 @@ static int __init ti_32k_timer_init(struct device_node *np) } sched_clock_register(omap_32k_read_sched_clock, 32, 32768); + persistent_clock_init_and_register(omap_32k_read_sched_clock, + CLOCKSOURCE_MASK(32), 32768, 0); + pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); return 0; -- 1.7.9.5
