ARM: use clockevents_config_and_register() where possible

The clockevent core is able to figure out the best mult and shift,
calculate min_delta_ns and max_delta_ns, with the necessary info passed
into clockevents_config_and_register().  Use this combined configure
and register function where possible to make the codes less error prone
and gain some positive diff stat.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Anton Vorontsov <cbouatmailru@gmail.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Tested-by: Roland Stigge <stigge@antcom.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: David Brown <davidb@codeaurora.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Barry Song <baohua.song@csr.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Tony Prisk <linux@prisktech.co.nz>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-omap2/timer.c

@@ -131,7 +131,6 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
 static struct clock_event_device clockevent_gpt = {
 	.name		= "gp_timer",
 	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.shift		= 32,
 	.rating		= 300,
 	.set_next_event	= omap2_gp_timer_set_next_event,
 	.set_mode	= omap2_gp_timer_set_mode,
@@ -340,17 +339,11 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
 
 	__omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
 
-	clockevent_gpt.mult = div_sc(clkev.rate, NSEC_PER_SEC,
-				     clockevent_gpt.shift);
-	clockevent_gpt.max_delta_ns =
-		clockevent_delta2ns(0xffffffff, &clockevent_gpt);
-	clockevent_gpt.min_delta_ns =
-		clockevent_delta2ns(3, &clockevent_gpt);
-		/* Timer internal resynch latency. */
-
 	clockevent_gpt.cpumask = cpu_possible_mask;
 	clockevent_gpt.irq = omap_dm_timer_get_irq(&clkev);
-	clockevents_register_device(&clockevent_gpt);
+	clockevents_config_and_register(&clockevent_gpt, clkev.rate,
+					3, /* Timer internal resynch latency */
+					0xffffffff);
 
 	pr_info("OMAP clockevent source: GPTIMER%d at %lu Hz\n",
 		gptimer_id, clkev.rate);