ARM: OMAP5: Enable arch timer support

Enable Cortex A15 generic timer support for OMAP5 based SOCs.
The CPU local timers run on the free running real time counter clock.
Acked-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/boot/dts/omap5.dtsi

@@ -33,9 +33,21 @@ aliases {
 	cpus {
 		cpu@0 {
 			compatible = "arm,cortex-a15";
+			timer {
+				compatible = "arm,armv7-timer";
+				/* 14th PPI IRQ, active low level-sensitive */
+				interrupts = <1 14 0x308>;
+				clock-frequency = <6144000>;
+			};
 		};
 		cpu@1 {
 			compatible = "arm,cortex-a15";
+			timer {
+				compatible = "arm,armv7-timer";
+				/* 14th PPI IRQ, active low level-sensitive */
+				interrupts = <1 14 0x308>;
+				clock-frequency = <6144000>;
+			};
 		};
 	};
 

arch/arm/mach-omap2/Kconfig

@@ -74,6 +74,7 @@ config SOC_OMAP5
 	select HAVE_SMP
 	select ARM_CPU_SUSPEND if PM
 	select SOC_HAS_REALTIME_COUNTER
+	select ARM_ARCH_TIMER
 
 comment "OMAP Core Type"
 	depends on ARCH_OMAP2

arch/arm/mach-omap2/timer.c

@@ -41,6 +41,7 @@
 #include <plat/dmtimer.h>
 #include <asm/smp_twd.h>
 #include <asm/sched_clock.h>
+#include <asm/arch_timer.h>
 #include "common.h"
 #include <plat/omap_hwmod.h>
 #include <plat/omap_device.h>
@@ -488,9 +489,15 @@ OMAP_SYS_TIMER(4)
 #ifdef CONFIG_SOC_OMAP5
 static void __init omap5_timer_init(void)
 {
+	int err;
+
 	omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
 	omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
 	realtime_counter_init();
+
+	err = arch_timer_of_register();
+	if (err)
+		pr_err("%s: arch_timer_register failed %d\n", __func__, err);
 }
 OMAP_SYS_TIMER(5)
 #endif