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Yeah that part was clear but the implementation can be better..

I thought over it and it seems having a new interface dma_ctrl_write_64
taking lsb and msb bits input looks better and scalable. It will be similar
to existing vdma_desc_write_64 impl. I will send v2 if it looks ok.

Yes that is much better, btw why not reuse same routine as common xilinx
lib functions :)

Thanks.  vdma_desc_write_64 uses a different offset i.e desc_offset.
For reusing it we need to have an additional check to derive offset
(ctrl_offset/desc_offset) based on channel config type. Considering
it, i think a separate helper interface _64 for desc/control offset
simplifies the flow. Please let me know your thoughts on it.

-Radhey

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~Vinod