sh: Add support for SH7723 CPU subtype.

This adds basic support for the SH7723 MobileR2 CPU.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/cpu-sh4/rtc.h b/include/asm-sh/cpu-sh4/rtc.h
index f3d0f53..25b1e6a 100644
--- a/include/asm-sh/cpu-sh4/rtc.h
+++ b/include/asm-sh/cpu-sh4/rtc.h
@@ -1,7 +1,12 @@
 #ifndef __ASM_SH_CPU_SH4_RTC_H
 #define __ASM_SH_CPU_SH4_RTC_H
 
+#ifdef CONFIG_CPU_SUBTYPE_SH7723
+#define rtc_reg_size		sizeof(u16)
+#else
 #define rtc_reg_size		sizeof(u32)
+#endif
+
 #define RTC_BIT_INVERTED	0x40	/* bug on SH7750, SH7750S */
 #define RTC_DEF_CAPABILITIES	RTC_CAP_4_DIGIT_YEAR