HHI_SYS_CPU_CLK_POSTMUX1
div = (reg & HHI_SYS_CPU_CLK_POSTMUX1) ?
HSET4(sc, offset, HHI_SYS_CPU_CLK_POSTMUX1);
HCLR4(sc, offset, HHI_SYS_CPU_CLK_POSTMUX1);