sh: clock div6 helper code

This patch adds div6 clock helper code. The div6 clocks
are simply 6-bit divide-by-n modules where n is 1 to 64.

Needed for vclk on sh7722, sh7723, sh7343 and sh7366.
sh7724 needs this even more for vclk, fclka, fclkb,
irdaclk and spuclk.

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

arch/sh/include/asm/clock.h

@@ -145,4 +145,14 @@ int sh_clk_mstp32_register(struct clk *clks, int nr);
 int sh_clk_div4_register(struct clk *clks, int nr,
 			 struct clk_div_mult_table *table);
 
+#define SH_CLK_DIV6(_name, _parent, _reg, _flags)	\
+{							\
+	.name = _name,					\
+	.parent = _parent,				\
+	.enable_reg = (void __iomem *)_reg,		\
+	.flags = _flags,				\
+}
+
+int sh_clk_div6_register(struct clk *clks, int nr);
+
 #endif /* __ASM_SH_CLOCK_H */