ARM: at91: rm9200: switch back to clockevents_config_and_register

The timer code for at91rm9200 was already converted some time ago by
Shawn Guo in commit 838a2ae (ARM: use clockevents_config_and_register()
where possible) but because of a rounding issue in the timer core this
resulted in an easily reproducible oops. So it was reverted (commit
b7a8ca5 (ARM: at91: rm9200 fix time support)) which stopped the oops
from happening because min_delta_ns is increased by one in arch code
which stopped from problem from happening.

Now that the timer core problem is fixed (commit a4578ea (clockevents:
Sanitize ticks to nsec conversion)), we can switch back to the
clockevents_config_and_register helper.

Tested-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index f607deb40f4da6a88a0778b203cdcfbbc8518ecc..bc7b363a3083bfdab31591786fe38991c199e2dc 100644 (file)
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -174,7 +174,6 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
 static struct clock_event_device clkevt = {
        .name           = "at91_tick",
        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-       .shift          = 32,
        .rating         = 150,
        .set_next_event = clkevt32k_next_event,
        .set_mode       = clkevt32k_mode,
@@ -265,11 +264,9 @@ void __init at91rm9200_timer_init(void)
        at91_st_write(AT91_ST_RTMR, 1);
 
        /* Setup timer clockevent, with minimum of two ticks (important!!) */
-       clkevt.mult = div_sc(AT91_SLOW_CLOCK, NSEC_PER_SEC, clkevt.shift);
-       clkevt.max_delta_ns = clockevent_delta2ns(AT91_ST_ALMV, &clkevt);
-       clkevt.min_delta_ns = clockevent_delta2ns(2, &clkevt) + 1;
        clkevt.cpumask = cpumask_of(0);
-       clockevents_register_device(&clkevt);
+       clockevents_config_and_register(&clkevt, AT91_SLOW_CLOCK,
+                                       2, AT91_ST_ALMV);
 
        /* register clocksource */
        clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);