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    SubjectRe: [PATCH] dma-mapping: move dma configuration to bus infrastructure
    >> +	.dev_groups		= amba_dev_groups,
    >> + .match = amba_match,
    >> + .uevent = amba_uevent,
    >> + .pm = &amba_pm,
    >> + .dma_configure = amba_dma_configure,
    >> + .dma_deconfigure = amba_dma_deconfigure,
    >> + .force_dma = true,
    >
    > This patch should also be removing force_dma because it no longer makes
    > sense. If DMA configuration is now done by a bus-level callback, then a bus
    > which wants its children to get DMA configuration needs to implement that
    > callback; there's nowhere to force a "default" global behaviour any more.

    Btw, we don't really know how many busses currently rely on OF or ACPI
    configuration. So maybe we need to keep those as a default?

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