This patch adds support for DMA read operation if controller
supports it which is determined by reading DT property "cdns,is-dma".
This patch provides hooks for vendor specific DMA routines as the
cadence qspi controller supports external DMA which is vendor specific.
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
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