ARM: at91: PIT: use request_irq instead of setup_irq

We can use the generic request_irq now to register a timer interrupt handler,
instead of the more complex setup_irq.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/at91sam926x_time.c

@@ -173,16 +173,10 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
-static struct irqaction at91sam926x_pit_irq = {
-	.name		= "at91_tick",
-	.flags		= IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= at91sam926x_pit_interrupt,
-};
-
 /*
  * Set up both clocksource and clockevent support.
  */
-static void __init at91sam926x_pit_common_init(void)
+static void __init at91sam926x_pit_common_init(unsigned int pit_irq)
 {
 	unsigned long	pit_rate;
 	unsigned	bits;
@@ -208,7 +202,9 @@ static void __init at91sam926x_pit_common_init(void)
 	clocksource_register_hz(&pit_clk, pit_rate);
 
 	/* Set up irq handler */
-	ret = setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
+	ret = request_irq(pit_irq, at91sam926x_pit_interrupt,
+			  IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
+			  "at91_tick", pit_base_addr);
 	if (ret)
 		panic(pr_fmt("Unable to setup IRQ\n"));
 
@@ -239,9 +235,7 @@ static void __init at91sam926x_pit_dt_init(struct device_node *node)
 	if (!irq)
 		panic(pr_fmt("Unable to get IRQ from DT\n"));
 
-	at91sam926x_pit_irq.irq = irq;
-
-	at91sam926x_pit_common_init();
+	at91sam926x_pit_common_init(irq);
 }
 CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
 		       at91sam926x_pit_dt_init);
@@ -252,9 +246,7 @@ void __init at91sam926x_pit_init(void)
 	if (IS_ERR(mck))
 		panic(pr_fmt("Unable to get mck clk\n"));
 
-	at91sam926x_pit_irq.irq = NR_IRQS_LEGACY + AT91_ID_SYS;
-
-	at91sam926x_pit_common_init();
+	at91sam926x_pit_common_init(NR_IRQS_LEGACY + AT91_ID_SYS);
 }
 
 void __init at91sam926x_ioremap_pit(u32 addr)