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>

2 files changed, 13 insertions, 2 deletions

diff --git a/arch/arm/mach-mxs/include/mach/common.h b/arch/arm/mach-mxs/include/mach/common.h
index de6c7ba42544..a7416c8a85ff 100644
--- a/arch/arm/mach-mxs/include/mach/common.h
+++ b/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);
 
diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c
index 02d36de9c4e8..7c3792613392 100644
--- a/arch/arm/mach-mxs/timer.c
+++ b/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);
 }