[PATCH v2 4/7] of/device: Set bus DMA mask as appropriate

On Mon, Jul 23, 2018 at 11:16:09PM +0100, Robin Murphy wrote:

When an explicit DMA limit is described by firmware, we need to remember
it regardless of how drivers might subsequently update their devices'
masks. The new bus_dma_mask field does that.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>