STM32_DMA3_CBR1
offset = STM32_DMA3_CBR1(id);
u32 cbr1 = readl_relaxed(ddata->base + STM32_DMA3_CBR1(chan->id));
writel_relaxed(hwdesc->cbr1, ddata->base + STM32_DMA3_CBR1(id));
cbr1 = readl_relaxed(ddata->base + STM32_DMA3_CBR1(chan->id));