AACI_INTCLR
writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
writel(0x1fff, aaci->base + AACI_INTCLR);