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Add spi-tx-bus-width and spi-rx-bus-width properties with value 4 to the n5x device tree. This update configures the SPI controller to use a 4-bit bus width for both transmission and reception, potentially improving SPI throughput and matching the hardware capabilities more closely. Signed-off-by: Fong, Yan Kei <yan.kei.fong@altera.com> Reviewed-by: Khairul Anuar Romli <khairul.anuar.romli@altera.com> Reviewed-by: Matthew Gerlach <matthew.gerlach@altera.com> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>