clocksource: mct: use fin_pll clock as the tick clock source for mct

With the migration of Exynos4 clocks to use common clock framework, the
old styled 'xtal' clock is not used anymore. Instead, the clock 'fin_pll'
is used as the tick clock for mct controller.
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

drivers/clocksource/exynos_mct.c

@@ -479,10 +479,13 @@ static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {
 
 static void __init exynos4_timer_resources(struct device_node *np)
 {
-	struct clk *mct_clk;
-	mct_clk = clk_get(NULL, "xtal");
+	struct clk *tick_clk;
 
-	clk_rate = clk_get_rate(mct_clk);
+	tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
+				clk_get(NULL, "fin_pll");
+	if (IS_ERR(tick_clk))
+		panic("%s: unable to determine tick clock rate\n", __func__);
+	clk_rate = clk_get_rate(tick_clk);
 
 	reg_base = np ? of_iomap(np, 0) : S5P_VA_SYSTIMER;
 	if (!reg_base)