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Some SPI-NAND chips do not support on-die ECC. For these chips, correction must apply on the SPI controller end. In order to avoid doing all the calculations by software, Macronix provides a specific engine that can offload the intensive work. Add Macronix ECC engine support, this engine can work in conjunction with a SPI controller and a raw NAND controller, it can be pipelined or external and supports linear and syndrome layouts. Right now the simplest configuration is supported: SPI controller external and linear ECC engine. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20211216111654.238086-15-miquel.raynal@bootlin.com