STM32_DMA_SFCR
dma_sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), dma_sfcr);
u32 sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
stm32_dma_write(dmadev, STM32_DMA_SFCR(chan->id), reg->dma_sfcr);
sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));