cpdma_chan_get_rate
ch_rate = cpdma_chan_get_rate(cpsw->txv[i].ch);
ch_rate = cpdma_chan_get_rate(txv[i].ch);
ch_rate = cpdma_chan_get_rate(txv[i].ch);
u32 cpdma_chan_get_rate(struct cpdma_chan *ch);