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    SubjectRe: [PATCH 5/5] Add DMA engine driver for Freescale MPC85xx processors.
    Dan Williams wrote:

    > This routine implies that there is a piece of code somewhere that
    > wants to select which channels it can use. A similar effect can be
    > achieved by registering a dma_client with the dmaengine interface
    > ('dma_async_client_register'). Then when the client code makes a call
    > to 'dma_async_client_chan_request' it receives a 'dma_event_callback'
    > for each channel in the system. It will also be asynchronously
    > notified of channels entering and leaving the system. The goal is to
    > share a common infrastructure for channel management.

    Are you familiar with the "flat device tree" used for PowerPC systems? The
    "piece of code somewhere" is the device tree subsystem that parses the device
    tree, which is compiled from the .dts files in arch/powerpc/boot/dts.

    The FDT is how PowerPC systems specify hardware configuration. In the case of
    85xx, the FDT contains entries for each DMA device (typically 2), and the
    entries contain sub-entries for each DMA channel as well as the address of the
    register sets for each channel.

    --
    Timur Tabi
    Linux Kernel Developer @ Freescale
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