mtd: spinand: Fill a default ECC provider/algorithm

The SPI-NAND layer default is on-die ECC because until now it was the
only one supported. New SPI-NAND chip flavors might use something else
as ECC engine provider but this will always be the default if the user
does not choose explicitly something else.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200930154109.3922-6-miquel.raynal@bootlin.com

drivers/mtd/nand/spi/core.c

@@ -309,7 +309,7 @@ static struct nand_ecc_engine_ops spinand_ondie_ecc_engine_ops = {
 	.finish_io_req = spinand_ondie_ecc_finish_io_req,
 };
 
-static __maybe_unused struct nand_ecc_engine spinand_ondie_ecc_engine = {
+static struct nand_ecc_engine spinand_ondie_ecc_engine = {
 	.ops = &spinand_ondie_ecc_engine_ops,
 };
 
@@ -1133,6 +1133,10 @@ static int spinand_init(struct spinand_device *spinand)
 	if (ret)
 		goto err_manuf_cleanup;
 
+	/* SPI-NAND default ECC engine is on-die */
+	nand->ecc.defaults.engine_type = NAND_ECC_ENGINE_TYPE_ON_DIE;
+	nand->ecc.ondie_engine = &spinand_ondie_ecc_engine;
+
 	/*
 	 * Right now, we don't support ECC, so let the whole oob
 	 * area available for the user.