spi: cadence_qspi: Add quad write support
Use quad write if SPI_TX_QUAD flag is set. Tested quad write on Stratix 10 SoC board (Micron serial NOR flash, mt25qu02g) Signed-off-by: NLey Foon Tan <ley.foon.tan@intel.com> Reviewed-by: NJagan Teki <jagan@openedev.com>
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