Document the devicetree bindings for MediaTek High-Speed DMA controller
which could be found on MT7623 SoC or other similar Mediatek SoCs.
Signed-off-by: NSean Wang <sean.wang@mediatek.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>