clockevents/drivers/nomadik-mtu: Migrate to new 'set-state' interface

Migrate nomadik-mtu driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/clocksource/nomadik-mtu.c

@@ -119,28 +119,27 @@ static void nmdk_clkevt_reset(void)
 	}
 }
 
-static void nmdk_clkevt_mode(enum clock_event_mode mode,
-			     struct clock_event_device *dev)
+static int nmdk_clkevt_shutdown(struct clock_event_device *evt)
 {
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		clkevt_periodic = true;
-		nmdk_clkevt_reset();
-		break;
-	case CLOCK_EVT_MODE_ONESHOT:
-		clkevt_periodic = false;
-		break;
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	case CLOCK_EVT_MODE_UNUSED:
 	writel(0, mtu_base + MTU_IMSC);
 	/* disable timer */
 	writel(0, mtu_base + MTU_CR(1));
 	/* load some high default value */
 	writel(0xffffffff, mtu_base + MTU_LR(1));
-		break;
-	case CLOCK_EVT_MODE_RESUME:
-		break;
-	}
+	return 0;
+}
+
+static int nmdk_clkevt_set_oneshot(struct clock_event_device *evt)
+{
+	clkevt_periodic = false;
+	return 0;
+}
+
+static int nmdk_clkevt_set_periodic(struct clock_event_device *evt)
+{
+	clkevt_periodic = true;
+	nmdk_clkevt_reset();
+	return 0;
 }
 
 static void nmdk_clksrc_reset(void)
@@ -164,10 +163,13 @@ static void nmdk_clkevt_resume(struct clock_event_device *cedev)
 
 static struct clock_event_device nmdk_clkevt = {
 	.name			= "mtu_1",
-	.features	= CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC |
+	.features		= CLOCK_EVT_FEAT_ONESHOT |
+				  CLOCK_EVT_FEAT_PERIODIC |
 				  CLOCK_EVT_FEAT_DYNIRQ,
 	.rating			= 200,
-	.set_mode	= nmdk_clkevt_mode,
+	.set_state_shutdown	= nmdk_clkevt_shutdown,
+	.set_state_periodic	= nmdk_clkevt_set_periodic,
+	.set_state_oneshot	= nmdk_clkevt_set_oneshot,
 	.set_next_event		= nmdk_clkevt_next,
 	.resume			= nmdk_clkevt_resume,
 };