[v5,10/21] mtd: rawnand: Create a helper to retrieve the ECC placement

Commit Message

Miquel Raynal May 14, 2020, 5:16 p.m. UTC

Use it from nand_dt_init() to initialize the ECC structure.

This allows the deprecation of the hw_syndrome ECC mode.

Signed-off-by: Miquel Raynal <[e-mail]>
---
 drivers/mtd/nand/raw/nand_base.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Patch

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 7e5a86fa38ee..f69a3336bc17 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5002,6 +5002,34 @@  static int of_get_nand_ecc_mode(struct device_node *np)
 	return -ENODEV;
 }
 
+enum nand_ecc_placement of_get_nand_ecc_placement(struct device_node *np)
+{
+	enum nand_ecc_placement placement;
+	const char *pm;
+	int err;
+
+	err = of_property_read_string(np, "nand-ecc-placement", &pm);
+	if (!err) {
+		for (placement = NAND_ECC_PLACEMENT_INTERLEAVED;
+		     placement < ARRAY_SIZE(nand_ecc_placement); placement++) {
+			if (!strcasecmp(pm, nand_ecc_placement[placement]))
+				return placement;
+		}
+	}
+
+	/*
+	 * For backward compatibility we support few obsoleted values that don't
+	 * have their mappings into the nand_ecc_placement enum anymore.
+	 */
+	err = of_property_read_string(np, "nand-ecc-mode", &pm);
+	if (!err) {
+		if (!strcasecmp(pm, "hw_syndrome"))
+			return NAND_ECC_PLACEMENT_INTERLEAVED;
+	}
+
+	return NAND_ECC_PLACEMENT_FREE;
+}
+
 static const char * const nand_ecc_algos[] = {
 	[NAND_ECC_HAMMING]	= "hamming",
 	[NAND_ECC_BCH]		= "bch",
@@ -5098,6 +5126,7 @@  static int nand_dt_init(struct nand_chip *chip)
 
 	ecc_mode = of_get_nand_ecc_mode(dn);
 	ecc_algo = of_get_nand_ecc_algo(dn);
+	chip->ecc.placement = of_get_nand_ecc_placement(dn);
 	ecc_strength = of_get_nand_ecc_strength(dn);
 	ecc_step = of_get_nand_ecc_step_size(dn);