timer: vt8500: Convert vt8500 to use CLKSRC_OF

This patch converts arch-vt8500 to make use of CLKSRC_OF. Doing so
removes the need for include/linux/vt8500_timer.h as vt8500_timer_init
no longer needs to be visible outside vt8500_timer.c

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-vt8500/Kconfig

@@ -4,6 +4,7 @@ config ARCH_VT8500
 	select ARCH_HAS_CPUFREQ
 	select ARCH_REQUIRE_GPIOLIB
 	select CLKDEV_LOOKUP
+	select CLKSRC_OF
 	select CPU_ARM926T
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_GPIO

arch/arm/mach-vt8500/vt8500.c

@@ -18,9 +18,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <linux/clocksource.h>
 #include <linux/io.h>
 #include <linux/pm.h>
-#include <linux/vt8500_timer.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -186,8 +186,8 @@ DT_MACHINE_START(WMT_DT, "VIA/Wondermedia SoC (Device Tree Support)")
 	.dt_compat	= vt8500_dt_compat,
 	.map_io		= vt8500_map_io,
 	.init_irq	= vt8500_init_irq,
-	.init_time	= vt8500_timer_init,
 	.init_machine	= vt8500_init,
+	.init_time	= clocksource_of_init,
 	.restart	= vt8500_restart,
 	.handle_irq	= vt8500_handle_irq,
 MACHINE_END

drivers/clocksource/vt8500_timer.c

@@ -134,7 +134,7 @@ static struct of_device_id vt8500_timer_ids[] = {
 	{ }
 };
 
-void __init vt8500_timer_init(void)
+static void __init vt8500_timer_init(void)
 {
 	struct device_node *np;
 	int timer_irq;
@@ -182,3 +182,4 @@ void __init vt8500_timer_init(void)
 	clockevents_register_device(&clockevent);
 }
 
+CLOCKSOURCE_OF_DECLARE(vt8500, "via,vt8500-timer", vt8500_timer_init)