mtd: rawnand: pasemi: Move the ECC initialization to ->attach_chip()

The probe function is only supposed to initialize the controller
hardware but not the ECC engine. Indeed, we don't know anything about
the NAND chip(s) at this stage. Let's move the logic initializing the
ECC engine, even pretty simple, to the ->attach_chip() hook which gets
called during nand_scan() routine, after the NAND chip discovery. As
the previously mentioned logic is supposed to parse the DT for us, it
is likely that the chip->ecc.* entries be overwritten. So let's avoid
this by moving these lines to ->attach_chip().

Fixes: d7157ff4 ("mtd: rawnand: Use the ECC framework user input parsing bits")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201113123424.32233-16-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/pasemi_nand.c

@@ -29,6 +29,7 @@
 
 static unsigned int lpcctl;
 static struct mtd_info *pasemi_nand_mtd;
+static struct nand_controller controller;
 static const char driver_name[] = "pasemi-nand";
 
 static void pasemi_read_buf(struct nand_chip *chip, u_char *buf, int len)
@@ -73,6 +74,18 @@ static int pasemi_device_ready(struct nand_chip *chip)
 	return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
 }
 
+static int pasemi_attach_chip(struct nand_chip *chip)
+{
+	chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
+	chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
+
+	return 0;
+}
+
+static const struct nand_controller_ops pasemi_ops = {
+	.attach_chip = pasemi_attach_chip,
+};
+
 static int pasemi_nand_probe(struct platform_device *ofdev)
 {
 	struct device *dev = &ofdev->dev;
@@ -100,6 +113,10 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 		goto out;
 	}
 
+	controller.ops = &pasemi_ops;
+	nand_controller_init(&controller);
+	chip->controller = &controller;
+
 	pasemi_nand_mtd = nand_to_mtd(chip);
 
 	/* Link the private data with the MTD structure */
@@ -132,8 +149,6 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 	chip->legacy.read_buf = pasemi_read_buf;
 	chip->legacy.write_buf = pasemi_write_buf;
 	chip->legacy.chip_delay = 0;
-	chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
-	chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
 
 	/* Enable the following for a flash based bad block table */
 	chip->bbt_options = NAND_BBT_USE_FLASH;