[PATCH v4] mtd: nand: arasan: Print warning for unsupported ecc modes

[Venkatesh Yadav Abbarapu]

Currently only hw ecc is supported in U-Boot. If any other ecc mode is
given in DT, it simply through an error. So better print
what is being done.

Revert this patch once soft ecc support is fixed in future.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at amd.com>
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>
---
Changes in v2:
- Added the ecc mode check in the arasan driver itself.
Changes in v3:
- Skip the driver probe when sw-ecc mode is present in the device tree.
Changes in v4:
- Updated the commit description to through an error if other
than hw ecc mentioned in the DT.
- Added the NULL check.
---
 drivers/mtd/nand/raw/arasan_nfc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mtd/nand/raw/arasan_nfc.c b/drivers/mtd/nand/raw/arasan_nfc.c
index 14766401bf..0b1b91f771 100644
--- a/drivers/mtd/nand/raw/arasan_nfc.c
+++ b/drivers/mtd/nand/raw/arasan_nfc.c
@@ -1233,6 +1233,7 @@ static int arasan_probe(struct udevice *dev)
 	struct mtd_info *mtd;
 	ofnode child;
 	int err = -1;
+	const char *str;
 
 	info->reg = dev_read_addr_ptr(dev);
 	mtd = nand_to_mtd(nand_chip);
@@ -1263,6 +1264,12 @@ static int arasan_probe(struct udevice *dev)
 		goto fail;
 	}
 
+	str = ofnode_read_string(nand_chip->flash_node, "nand-ecc-mode");
+	if (!str || strcmp(str, "hw") != 0) {
+		printf("%s ecc mode is not supported\n", str);
+		return -EINVAL;
+	}
+
 	nand_chip->ecc.mode = NAND_ECC_HW;
 	nand_chip->ecc.hwctl = NULL;
 	nand_chip->ecc.read_page = arasan_nand_read_page_hwecc;
-- 
2.17.1