mtd: rawnand: Move ->setup_data_interface() to nand_controller_ops

->setup_data_interface() is a controller specific method and should
thus be placed in nand_controller_ops.

In order to make that work with controllers that support keeping
pre-configured timings we need to add a new NAND_KEEP_TIMINGS flag to
inform the core it should skip the timings selection step.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Tested-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
diff --git a/drivers/mtd/nand/raw/s3c2410.c b/drivers/mtd/nand/raw/s3c2410.c
index a890546..adc7a19 100644
--- a/drivers/mtd/nand/raw/s3c2410.c
+++ b/drivers/mtd/nand/raw/s3c2410.c
@@ -876,8 +876,8 @@
 	 * let's keep behavior unchanged for legacy boards booting via pdata and
 	 * auto-detect timings only when booting with a device tree.
 	 */
-	if (np)
-		chip->setup_data_interface = s3c2410_nand_setup_data_interface;
+	if (!np)
+		chip->options |= NAND_KEEP_TIMINGS;
 
 	switch (info->cpu_type) {
 	case TYPE_S3C2410:
@@ -1011,6 +1011,7 @@
 
 static const struct nand_controller_ops s3c24xx_nand_controller_ops = {
 	.attach_chip = s3c2410_nand_attach_chip,
+	.setup_data_interface = s3c2410_nand_setup_data_interface,
 };
 
 static const struct of_device_id s3c24xx_nand_dt_ids[] = {