DMA_CCTRL_CLASS
class_low = FIELD_GET(DMA_CCTRL_CLASS, reg);
val &= ~DMA_CCTRL_CLASS;
val |= FIELD_PREP(DMA_CCTRL_CLASS, class_low);
class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7);
ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH, class_val,