On Tue, Sep 01, 2020 at 05:36:17PM +0200, Ulf Hansson wrote: > > I still don't think this makes sense, as the dma_mask should always > > be non-NULL here. > > If that is the case, I wonder how the driver could even have worked without DMA. > > Because in the existing code, host->dma_dev gets assigned to > spi->master->dev.parent->dma_mask - which seems to turn on the DMA > usage in the driver. > > What am I missing? Do you know of other non-DMA users? For SH nommu it probably worked because SH nommu used to provide a DMA implementation that worked fine for streaming maps, but was completely broken for coherent allocation. And this driver appears to only use the former.
