PDC_RINGSET
#define PDC_RCVLAZY0_OFFSET (0x30 + 4 * PDC_RINGSET)
return pdc_ring_init(chan->con_priv, PDC_RINGSET);
int ringset = PDC_RINGSET;
dma_reg = &pdcs->regs->dmaregs[PDC_RINGSET];
#define PDC_RCVINT_0 (16 + PDC_RINGSET)