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Fractional dividers may have special requirements concerning numerator and denominator selection that differ from just getting the best approximation. For example on Rockchip socs the denominator must be at least 20 times larger than the numerator to generate precise clock frequencies. Therefore add the ability to provide custom approximation functions. Change-Id: I656a5851a3e2581b7f1b44bd67681ac00172873d Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>