Change Details

Platforms with DMA coherent caches should have 'dma-coherent' property defined in /soc (simple-bus) node of DTS. State of DMA coherency is kept in dma tag of first simple-bus (flag BUS_DMA_COHERENT) and inherited by child device drivers on creation of dma tag.

Allow to set the dma tag for nexus in the platform init code, so that all busses and devices would be able to inherit it. This change is useful e.g. for setting coherent dma tag for the platforms with hardware IO cache coherency.

Platforms with DMA coherent caches should have 'dma-coherent' propertyAllow to set the dma tag for nexus in the platform init code, defined in /soc (simple-bus) node of DTS. State of DMA coherency is keptso that all busses and devices would be able to inherit it. in dma tag of first simple-bus (flag BUS_DMA_COHERENT) and inheritedThis change is useful e.g. for setting coherent dma tag for by child device drivers on creation of dma tagthe platforms with hardware IO cache coherency.