sh: add a list of parent configurations to struct clk

Many system clocks can select a parent by writing a value to a specific field
in the configuration register. Add a list of parents and location and width of
the source selection field in the clock configuration register to struct clk to
assist in clk_set_parent() implementation.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/linux/sh_clk.h

@@ -25,6 +25,10 @@ struct clk {
 	int			id;
 
 	struct clk		*parent;
+	struct clk		**parent_table;	/* list of parents to */
+	unsigned short		parent_num;	/* choose between */
+	unsigned char		src_shift;	/* source clock field in the */
+	unsigned char		src_width;	/* configuration register */
 	struct clk_ops		*ops;
 
 	struct list_head	children;