mtd: nand: omap2: Fix partition creation via cmdline mtdparts

commit 2d283ede59869159f4bb84ae689258c5caffce54 upstream.

commit c9711ec5250b ("mtd: nand: omap: Clean up device tree support")
caused the parent device name to be changed from "omap2-nand.0"
to "<base address>.nand"  (e.g. 30000000.nand on omap3 platforms).
This caused mtd->name to be changed as well. This breaks partition
creation via mtdparts passed by u-boot as it uses "omap2-nand.0"
for the mtd-id.

Fix this by explicitly setting the mtd->name to "omap2-nand.<CS number>"
if it isn't already set by nand_set_flash_node(). CS number is the
NAND controller instance ID.

Fixes: c9711ec5250b ("mtd: nand: omap: Clean up device tree support")
Reported-by: Leto Enrico <enrico.leto@siemens.com>
Reported-by: Adam Ford <aford173@gmail.com>
Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5513bfd9cdc9..c178cb0dd219 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1856,6 +1856,15 @@ static int omap_nand_probe(struct platform_device *pdev)
         nand_chip->ecc.priv     = NULL;
         nand_set_flash_node(nand_chip, dev->of_node);
 
+        if (!mtd->name) {
+                mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+                                           "omap2-nand.%d", info->gpmc_cs);
+                if (!mtd->name) {
+                        dev_err(&pdev->dev, "Failed to set MTD name\n");
+                        return -ENOMEM;
+                }
+        }
+
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
         if (IS_ERR(nand_chip->IO_ADDR_R))