On Thu, Mar 24, 2016 at 04:02:00PM +0530, Lokesh Vutla wrote: > dma_addr_t holds any valid DMA address. If the DMA API only uses 32-bit > addresses, dma_addr_t need only be 32 bits wide. Bus addresses, e.g., PCI > BARs, > may be wider than 32 bits, but drivers do memory-mapped I/O to ioremapped > kernel virtual addresses, so they don't care about the size of the actual > bus addresses. > Also 32 bit ARM systems with LPAE enabled can use 64bit address space, but > DMA still use 32bit address like in case of DRA7 and Keystone platforms. > > This is inspired from the Linux kernel types implementation[1] > > [1] > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/linux/types.h#n142 > > Acked-by: Lukasz Majewski <[email protected]> > Signed-off-by: Lokesh Vutla <[email protected]>
Reviewed-by: Tom Rini <[email protected]> -- Tom
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