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    SubjectRe: [alsa-devel] [PATCH v5] sound/soc/lapis: add platform driver for ML7213
    On Fri, May 25, 2012 at 7:20 PM, Vinod Koul <> wrote:
    >> >> > Nobody seems to be working on it as far as I can tell, I've certainly
    >> >> > not seen any patches.
    >> >
    >> >> If so, could you accept current platform/machine driver ?
    >> >
    >> > Ideally what would be happening here is that you or other people who
    >> > have such systems would be working to add the required support to the
    >> > core code, there's clearly a need for common code here as there are a
    >> > number of different systems that don't have cyclic DMA and it wouldn't
    >> > be great to end up with duplicated code.
    >> >
    >> > Is there some great difficulty in factoring out the support for
    >> > non-cyclic audio DMA on dmaengine - it seems like if there is we must
    >> > have a serious problem in dmaengine which we should fix?  If there is a
    >> > substantial difficulty then that's different but it doesn't feel like
    >> > we've tried doing common code yet, if there's problems doing that I'd
    >> > like to understand what they are before we jump ahead of ourselves.
    >> I'm not so familiar with Linux's DMA idea.
    >> So we don't know whether non-cyclic dmaengine has problem or not.
    > First you should not be writing your own dma driver, it *needs* to use
    > dmaenegine. We already have bunch of driver supported, so there may be a
    > case that existing driver works straight or with little modifications.
    > Using your own dma driver is a dead road, so sooner you move over better
    > it is.
    I've never developed our own dma driver.
    I've developed our ASoC driver using linux standard DMA framework.

    ROHM Co., Ltd.
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