ASoC: dmaengine_pcm: Add support for compat platforms
Add support for platforms which don't use devicetree yet or have to optionally support a non-devicetree way to request the DMA channel. The patch adds the compat_request_channel and compat_filter_fn callbacks to the snd_dmaengine_pcm_config struct. If the compat_request_channel is implemented it will be used to request the DMA channel. If not dma_request_channel with compat_filter_fn as the filter function will be used to request the channel. The patch also exports the snd_dmaengine_pcm_request_chan() function, since compat platforms will want to use it to request their DMA channel. Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Tested-by: NStephen Warren <swarren@nvidia.com> Tested-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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