clocksource: SuperH TMU Timer driver

This patch adds a TMU driver for the SuperH architecture.

The TMU driver is a platform driver with early platform
support to allow using a TMU channel as clockevent or
clocksource during system bootup or later.

Clocksource or clockevent can be selected.
Both periodic and oneshot clockevents are supported.

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

arch/sh/Kconfig

@@ -116,6 +116,9 @@ config SYS_SUPPORTS_CMT
 config SYS_SUPPORTS_MTU2
 	bool
 
+config SYS_SUPPORTS_TMU
+	bool
+
 config STACKTRACE_SUPPORT
 	def_bool y
 
@@ -470,6 +473,15 @@ config SH_TMU
 	help
 	  This enables the use of the TMU as the system timer.
 
+config SH_TIMER_TMU
+	bool "TMU timer driver"
+	depends on !SH_TMU && SYS_SUPPORTS_TMU
+	default y
+	select GENERIC_TIME
+	select GENERIC_CLOCKEVENTS
+	help
+	  This enables the build of the TMU timer driver.
+
 config SH_TIMER_CMT
 	bool "CMT timer driver"
 	depends on SYS_SUPPORTS_CMT

drivers/clocksource/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_X86_PM_TIMER)	+= acpi_pm.o
 obj-$(CONFIG_SCx200HR_TIMER)	+= scx200_hrt.o
 obj-$(CONFIG_SH_TIMER_CMT)	+= sh_cmt.o
 obj-$(CONFIG_SH_TIMER_MTU2)	+= sh_mtu2.o
+obj-$(CONFIG_SH_TIMER_TMU)	+= sh_tmu.o