On Fri, May 08, 2020 at 04:29:39PM +0300, Serge Semin wrote: > Since the common code in the spi-dw-dma.c driver is ready to be used > by the MMIO driver, we just need to initialize the DW SPI private data > fields with Tx/Rx DMA channel handlers and setup the DW SPI DMA > callbacks. This commit introduces such alterations to the DW SPI > DMA/MMIO code. A dedicated DW SPI MMIO DMA initializer performs the > DMA channels request from the parental device (which is supposed to be > a DW SPI platform device). Then it checks whether the retrieved DW DMA > channels support LLP. If they don't currently we print a warning, that > further DMA usage may be finished with DW SPI inbound FIFO overflow > (nothing else we can do about it at the moment). Finally the DW SPI > MMIO DMA initializer sets the DMA-inited flag. > > Currently the DMA will be initialized only for a generic DW SPI MMIO > device declared with "snps,dw-apb-ssi" compatible string if SPI_DW_DMA > kernel config is enabled. Already in spi/for-next (see for generic suffix in spi-dw-mid.c). -- With Best Regards, Andy Shevchenko
