MMCHS_SYSCTL_CLKD_SHIFT
clkdiv = ((val32 >> MMCHS_SYSCTL_CLKD_SHIFT) &
val32 &= ~(MMCHS_SYSCTL_CLKD_MASK << MMCHS_SYSCTL_CLKD_SHIFT);
MMCHS_SYSCTL_CLKD_SHIFT);
val32 |= clkdiv << MMCHS_SYSCTL_CLKD_SHIFT;