clocksource: SuperH MTU2 Timer driver

This patch adds a MTU2 driver for the SuperH architecture.

The MTU2 driver is a platform driver with early platform
support to allow using a MTU2 channel as only clockevent
during system bootup.

Clocksource on sh2a is currently unsupported due to code
generation issues with 64-bit math, so at this point only
periodic clockevent support is in place.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 6f91478826d5..6d0dd378ecad 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -113,6 +113,9 @@ config SYS_SUPPORTS_PCI
 config SYS_SUPPORTS_CMT
         bool
 
+config SYS_SUPPORTS_MTU2
+        bool
+
 config STACKTRACE_SUPPORT
         def_bool y
 
@@ -478,6 +481,14 @@ config SH_MTU2
         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
+        default y
+        select GENERIC_CLOCKEVENTS
+        help
+          This enables build of the MTU2 timer driver.
+
 config SH_TIMER_IRQ
         int
         default "28" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785 || \