mtd: rawnand: jz4740: convert driver to nand_scan()

Two helpers have been added to the core to do all kind of controller
side configuration/initialization between the detection phase and the
final NAND scan. Implement these hooks so that we can convert the driver
to just use nand_scan() instead of the nand_scan_ident() +
nand_scan_tail() pair.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/nand/raw/jz4740_nand.c

@@ -309,7 +309,6 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 			       size_t chipnr, uint8_t *nand_maf_id,
 			       uint8_t *nand_dev_id)
 {
-	struct jz_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
 	int ret;
 	char res_name[6];
 	uint32_t ctrl;
@@ -332,20 +331,10 @@ static int jz_nand_detect_bank(struct platform_device *pdev,
 
 	if (chipnr == 0) {
 		/* Detect first chip. */
-		ret = nand_scan_ident(mtd, 1, NULL);
+		ret = nand_scan(mtd, 1);
 		if (ret)
 			goto notfound_id;
 
-		if (pdata && pdata->ident_callback)
-			pdata->ident_callback(pdev, mtd, &pdata->partitions,
-					      &pdata->num_partitions);
-
-		ret = nand_scan_tail(mtd);
-		if (ret) {
-			dev_err(&pdev->dev,  "Failed to scan NAND\n");
-			goto notfound_id;
-		}
-
 		/* Retrieve the IDs from the first chip. */
 		chip->select_chip(mtd, 0);
 		nand_reset_op(chip);
@@ -379,6 +368,24 @@ notfound_id:
 	return ret;
 }
 
+static int jz_nand_attach_chip(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct device *dev = mtd->dev.parent;
+	struct jz_nand_platform_data *pdata = dev_get_platdata(dev);
+	struct platform_device *pdev = to_platform_device(dev);
+
+	if (pdata && pdata->ident_callback)
+		pdata->ident_callback(pdev, mtd, &pdata->partitions,
+				      &pdata->num_partitions);
+
+	return 0;
+}
+
+static const struct nand_controller_ops jz_nand_controller_ops = {
+	.attach_chip = jz_nand_attach_chip,
+};
+
 static int jz_nand_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -422,6 +429,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	chip->chip_delay = 50;
 	chip->cmd_ctrl = jz_nand_cmd_ctrl;
 	chip->select_chip = jz_nand_select_chip;
+	chip->dummy_controller.ops = &jz_nand_controller_ops;
 
 	if (nand->busy_gpio)
 		chip->dev_ready = jz_nand_dev_ready;