MMP_CLK_BITS_MASK
mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
((data & MMP_CLK_BITS_MASK(width, shift)) >> (shift))
(((val) << (shift)) & MMP_CLK_BITS_MASK(width, shift))