spi: spi-mem: Add support for Zynq QSPI controller
Add support for QSPI controller driver used by Xilinx Zynq SOC. Signed-off-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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