sh: remove old MTU2 driver

This patch removes the old MTU2 driver (CONFIG_SH_MTU2/timer-mtu2.c)

As replacement, select the sh_cmt driver with CONFIG_SH_TIMER_MTU2
and configure timer channel using platform data.

If multiple MTU channels are enabled using platform data, use the
earlytimer parameter on the kernel command line to select channel.
For instance, use "earlytimer=sh_mtu2.0" to select the first channel.

To verify which timer is being used, look at printouts or the timer
irq count in /proc/interrupts.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -479,16 +479,9 @@ config SH_TIMER_CMT
 	help
 	  This enables build of the CMT timer driver.
 
-config SH_MTU2
-	bool "MTU2 timer support"
-	depends on CPU_SH2A && !GENERIC_TIME
-	default y
-	help
-	  This enables the use of the MTU2 as the system timer.
-
 config SH_TIMER_MTU2
 	bool "MTU2 timer driver"
-	depends on SYS_SUPPORTS_MTU2 && !SH_MTU2
+	depends on SYS_SUPPORTS_MTU2
 	default y
 	select GENERIC_CLOCKEVENTS
 	help

arch/sh/include/asm/timer.h

@@ -23,7 +23,7 @@ struct sys_timer {
 
 #define TICK_SIZE (tick_nsec / 1000)
 
-extern struct sys_timer tmu_timer, mtu2_timer;
+extern struct sys_timer tmu_timer;
 extern struct sys_timer *sys_timer;
 
 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET

arch/sh/kernel/timers/Makefile

@@ -5,6 +5,5 @@
 obj-y	:= timer.o
 
 obj-$(CONFIG_SH_TMU)		+= timer-tmu.o
-obj-$(CONFIG_SH_MTU2)		+= timer-mtu2.o
 
 obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= timer-broadcast.o

arch/sh/kernel/timers/timer.c

@@ -16,9 +16,6 @@
 static struct sys_timer *sys_timers[] = {
 #ifdef CONFIG_SH_TMU
 	&tmu_timer,
-#endif
-#ifdef CONFIG_SH_MTU2
-	&mtu2_timer,
 #endif
 	NULL,
 };