Store the pointer to slave device, which requested our channel. It will be
later used to implement runtime PM of PL330 DMA controller. Although
DMA channels might be requested many times, each DMA peripheral channel is
physically dedicated only for specific hardware, so there should be only
one
Store the pointer to slave device, which requested our channel. It will be
later used to implement runtime PM of PL330 DMA controller. Although
DMA channels might be requested many times, each DMA peripheral channel is
physically dedicated only for specific hardware, so there should be only
one
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