AUART_CTRL0_CLKGATE
mxs_clr(AUART_CTRL0_CLKGATE, s, REG_CTRL0);
mxs_clr(AUART_CTRL0_CLKGATE, s, REG_CTRL0);
if (reg & AUART_CTRL0_CLKGATE)
mxs_clr(AUART_CTRL0_CLKGATE, s, REG_CTRL0);
mxs_set(AUART_CTRL0_CLKGATE, s, REG_CTRL0);
mxs_clr(AUART_CTRL0_CLKGATE, s, REG_CTRL0);