ZYNQMP_DMA_ISR
val = readl(chan->regs + ZYNQMP_DMA_ISR);
writel(val, chan->regs + ZYNQMP_DMA_ISR);
isr = readl(chan->regs + ZYNQMP_DMA_ISR);
writel(isr, chan->regs + ZYNQMP_DMA_ISR);