AUART_CTRL0_SFTRST
mxs_clr(AUART_CTRL0_SFTRST, s, REG_CTRL0);
if (!(reg & AUART_CTRL0_SFTRST))
if (reg & AUART_CTRL0_SFTRST)
mxs_set(AUART_CTRL0_SFTRST, s, REG_CTRL0);