tree 58a8b23869008d8a1b99bb2e33969095bbf4e53e
parent b7dcaf06656963c4b8f0b482c28068bba5dcb804
author Stephen Warren <swarren@wwwdotorg.org> 1427249253 -0600
committer Marek Vasut <marex@denx.de> 1428983279 +0200

Create API to map between CPU physical and bus addresses

On some SoCs, DMA-capable peripherals see a different address space to
the CPU's physical address space. Create an API to allow platform-agnostic
drivers to convert between the two address spaces when programming DMA
operations.

This API will exist on all platforms, but will have a dummy implementation
when this feature is not required. Other platforms will enable
CONFIG_PHYS_TO_BUS and provide the required implementation.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>