ARM: mxs: retrieve timer irq from device tree

Rather than using the static timer irq definition, we should retrieve
timer irq from device tree for better.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx23.dtsi

@@ -389,8 +389,9 @@
 			};
 
 			timrot@80068000 {
+				compatible = "fsl,imx23-timrot", "fsl,timrot";
 				reg = <0x80068000 0x2000>;
-				status = "disabled";
+				interrupts = <28 29 30 31>;
 			};
 
 			auart0: serial@8006c000 {

arch/arm/boot/dts/imx28.dtsi

@@ -683,8 +683,9 @@
 			};
 
 			timrot@80068000 {
+				compatible = "fsl,imx28-timrot", "fsl,timrot";
 				reg = <0x80068000 0x2000>;
-				status = "disabled";
+				interrupts = <48 49 50 51>;
 			};
 
 			auart0: serial@8006a000 {

arch/arm/mach-mxs/include/mach/common.h

@@ -13,7 +13,7 @@
 
 extern const u32 *mxs_get_ocotp(void);
 extern int mxs_reset_block(void __iomem *);
-extern void mxs_timer_init(int);
+extern void mxs_timer_init(void);
 extern void mxs_restart(char, const char *);
 extern int mxs_saif_clkmux_select(unsigned int clkmux);
 

arch/arm/mach-mxs/timer.c

@@ -25,6 +25,8 @@
 #include <linux/irq.h>
 #include <linux/clockchips.h>
 #include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
 
 #include <asm/mach/time.h>
 #include <mach/mxs.h>
@@ -244,9 +246,17 @@ static int __init mxs_clocksource_init(struct clk *timer_clk)
 	return 0;
 }
 
-void __init mxs_timer_init(int irq)
+void __init mxs_timer_init(void)
 {
+	struct device_node *np;
 	struct clk *timer_clk;
+	int irq;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,timrot");
+	if (!np) {
+		pr_err("%s: failed find timrot node\n", __func__);
+		return;
+	}
 
 	timer_clk = clk_get_sys("timrot", NULL);
 	if (IS_ERR(timer_clk)) {
@@ -295,5 +305,6 @@ void __init mxs_timer_init(int irq)
 	mxs_clockevent_init(timer_clk);
 
 	/* Make irqs happen */
+	irq = irq_of_parse_and_map(np, 0);
 	setup_irq(irq, &mxs_timer_irq);
 }

drivers/clk/mxs/clk-imx23.c

@@ -200,7 +200,7 @@ int __init mx23_clocks_init(void)
 	for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
 		clk_prepare_enable(clks[clks_init_on[i]]);
 
-	mxs_timer_init(MX23_INT_TIMER0);
+	mxs_timer_init();
 
 	return 0;
 }

drivers/clk/mxs/clk-imx28.c

@@ -337,7 +337,7 @@ int __init mx28_clocks_init(void)
 	for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
 		clk_prepare_enable(clks[clks_init_on[i]]);
 
-	mxs_timer_init(MX28_INT_TIMER0);
+	mxs_timer_init();
 
 	return 0;
 }