mtd: rawnand: omap_gpmc: fix OF based partition parsing for NAND

Set NAND chip ofnode and device so OF based partition parsing
can work.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Link: https://www.mail-archive.com/u-boot@lists.denx.de/msg499178.html
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
diff --git a/drivers/mtd/nand/raw/omap_gpmc.c b/drivers/mtd/nand/raw/omap_gpmc.c
index c430f6d..2f8fa7d 100644
--- a/drivers/mtd/nand/raw/omap_gpmc.c
+++ b/drivers/mtd/nand/raw/omap_gpmc.c
@@ -1189,6 +1189,8 @@
 
 	base = devm_ioremap(dev, res.start, resource_size(&res));
 	gpmc_nand_init(nand, base);
+	mtd->dev = dev;
+	nand_set_flash_node(nand, dev_ofnode(dev));
 
 	ret = nand_scan(mtd, CONFIG_SYS_NAND_MAX_CHIPS);
 	if (ret)