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The system controller "shares" a SPI flash device with a QSPI controller in the MSS. This flash is used to store FPGA bitstreams & other metadata. IAP and Auto Upgrade both write images to this flash that the System Controller will use to re-program the FPGA. Add a phandle property signifying which flash device is connected to the system controller. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>