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>

include/linux/sh_mtu2.h

@@ -0,0 +1,12 @@
+#ifndef __SH_MTU2_H__
+#define __SH_MTU2_H__
+
+struct sh_mtu2_config {
+	char *name;
+	int channel_offset;
+	int timer_bit;
+	char *clk;
+	unsigned long clockevent_rating;
+};
+
+#endif /* __SH_MTU2_H__ */