diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index cb12179b63a5..f24e8d2083f8 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -157,6 +157,17 @@
 
 #define NFC_MAX_CS		7
 
+/*
+ * On A10/A23, this is the size of the NDFC User Data Register, containing the
+ * mandatory user data bytes following the ECC for each ECC step.
+ * Thus, for each ECC step, we need the ECC bytes + USER_DATA_SZ.
+ * Those bits are currently unsused, and kept as default value 0xffffffff.
+ *
+ * On H6/H616, this size became configurable, from 0 bytes to 32, via the
+ * USER_DATA_LEN registers.
+ */
+#define USER_DATA_SZ 4
+
 /**
  * struct sunxi_nand_chip_sel - stores information related to NAND Chip Select
  *
@@ -729,7 +740,7 @@ static void sunxi_nfc_hw_ecc_set_prot_oob_bytes(struct nand_chip *nand,
 						bool bbm, int page)
 {
 	struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller);
-	u8 user_data[4];
+	u8 user_data[USER_DATA_SZ];
 
 	/* Randomize the Bad Block Marker. */
 	if (bbm && (nand->options & NAND_NEED_SCRAMBLING)) {
@@ -781,7 +792,7 @@ static int sunxi_nfc_hw_ecc_correct(struct nand_chip *nand, u8 *data, u8 *oob,
 			memset(data, pattern, ecc->size);
 
 		if (oob)
-			memset(oob, pattern, ecc->bytes + 4);
+			memset(oob, pattern, ecc->bytes + USER_DATA_SZ);
 
 		return 0;
 	}
@@ -826,7 +837,7 @@ static int sunxi_nfc_hw_ecc_read_chunk(struct nand_chip *nand,
 	if (ret)
 		return ret;
 
-	*cur_off = oob_off + ecc->bytes + 4;
+	*cur_off = oob_off + ecc->bytes + USER_DATA_SZ;
 
 	ret = sunxi_nfc_hw_ecc_correct(nand, data, oob_required ? oob : NULL, 0,
 				       readl(nfc->regs + NFC_REG_ECC_ST),
@@ -846,11 +857,11 @@ static int sunxi_nfc_hw_ecc_read_chunk(struct nand_chip *nand,
 			memcpy_fromio(data, nfc->regs + NFC_RAM0_BASE,
 				      ecc->size);
 
-		nand_change_read_column_op(nand, oob_off, oob, ecc->bytes + 4,
-					   false);
+		nand_change_read_column_op(nand, oob_off, oob,
+					   ecc->bytes + USER_DATA_SZ, false);
 
-		ret = nand_check_erased_ecc_chunk(data,	ecc->size,
-						  oob, ecc->bytes + 4,
+		ret = nand_check_erased_ecc_chunk(data,	ecc->size, oob,
+						  ecc->bytes + USER_DATA_SZ,
 						  NULL, 0, ecc->strength);
 		if (ret >= 0)
 			raw_mode = 1;
@@ -860,7 +871,7 @@ static int sunxi_nfc_hw_ecc_read_chunk(struct nand_chip *nand,
 		if (oob_required) {
 			nand_change_read_column_op(nand, oob_off, NULL, 0,
 						   false);
-			sunxi_nfc_randomizer_read_buf(nand, oob, ecc->bytes + 4,
+			sunxi_nfc_randomizer_read_buf(nand, oob, ecc->bytes + USER_DATA_SZ,
 						      true, page);
 
 			sunxi_nfc_hw_ecc_get_prot_oob_bytes(nand, oob, 0,
@@ -954,7 +965,7 @@ static int sunxi_nfc_hw_ecc_read_chunks_dma(struct nand_chip *nand, uint8_t *buf
 
 	for (i = 0; i < nchunks; i++) {
 		int data_off = i * ecc->size;
-		int oob_off = i * (ecc->bytes + 4);
+		int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 		u8 *data = buf + data_off;
 		u8 *oob = nand->oob_poi + oob_off;
 		bool erased;
@@ -971,7 +982,7 @@ static int sunxi_nfc_hw_ecc_read_chunks_dma(struct nand_chip *nand, uint8_t *buf
 			/* TODO: use DMA to retrieve OOB */
 			nand_change_read_column_op(nand,
 						   mtd->writesize + oob_off,
-						   oob, ecc->bytes + 4, false);
+						   oob, ecc->bytes + USER_DATA_SZ, false);
 
 			sunxi_nfc_hw_ecc_get_prot_oob_bytes(nand, oob, i,
 							    !i, page);
@@ -986,7 +997,7 @@ static int sunxi_nfc_hw_ecc_read_chunks_dma(struct nand_chip *nand, uint8_t *buf
 	if (status & NFC_ECC_ERR_MSK) {
 		for (i = 0; i < nchunks; i++) {
 			int data_off = i * ecc->size;
-			int oob_off = i * (ecc->bytes + 4);
+			int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 			u8 *data = buf + data_off;
 			u8 *oob = nand->oob_poi + oob_off;
 
@@ -1006,10 +1017,10 @@ static int sunxi_nfc_hw_ecc_read_chunks_dma(struct nand_chip *nand, uint8_t *buf
 			/* TODO: use DMA to retrieve OOB */
 			nand_change_read_column_op(nand,
 						   mtd->writesize + oob_off,
-						   oob, ecc->bytes + 4, false);
+						   oob, ecc->bytes + USER_DATA_SZ, false);
 
-			ret = nand_check_erased_ecc_chunk(data,	ecc->size,
-							  oob, ecc->bytes + 4,
+			ret = nand_check_erased_ecc_chunk(data,	ecc->size, oob,
+							  ecc->bytes + USER_DATA_SZ,
 							  NULL, 0,
 							  ecc->strength);
 			if (ret >= 0)
@@ -1062,7 +1073,7 @@ static int sunxi_nfc_hw_ecc_write_chunk(struct nand_chip *nand,
 	if (ret)
 		return ret;
 
-	*cur_off = oob_off + ecc->bytes + 4;
+	*cur_off = oob_off + ecc->bytes + USER_DATA_SZ;
 
 	return 0;
 }
@@ -1073,7 +1084,7 @@ static void sunxi_nfc_hw_ecc_write_extra_oob(struct nand_chip *nand,
 {
 	struct mtd_info *mtd = nand_to_mtd(nand);
 	struct nand_ecc_ctrl *ecc = &nand->ecc;
-	int offset = ((ecc->bytes + 4) * ecc->steps);
+	int offset = ((ecc->bytes + USER_DATA_SZ) * ecc->steps);
 	int len = mtd->oobsize - offset;
 
 	if (len <= 0)
@@ -1106,7 +1117,7 @@ static int sunxi_nfc_hw_ecc_read_page(struct nand_chip *nand, uint8_t *buf,
 
 	for (i = 0; i < ecc->steps; i++) {
 		int data_off = i * ecc->size;
-		int oob_off = i * (ecc->bytes + 4);
+		int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 		u8 *data = buf + data_off;
 		u8 *oob = nand->oob_poi + oob_off;
 
@@ -1165,7 +1176,7 @@ static int sunxi_nfc_hw_ecc_read_subpage(struct nand_chip *nand,
 	for (i = data_offs / ecc->size;
 	     i < DIV_ROUND_UP(data_offs + readlen, ecc->size); i++) {
 		int data_off = i * ecc->size;
-		int oob_off = i * (ecc->bytes + 4);
+		int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 		u8 *data = bufpoi + data_off;
 		u8 *oob = nand->oob_poi + oob_off;
 
@@ -1219,7 +1230,7 @@ static int sunxi_nfc_hw_ecc_write_page(struct nand_chip *nand,
 
 	for (i = 0; i < ecc->steps; i++) {
 		int data_off = i * ecc->size;
-		int oob_off = i * (ecc->bytes + 4);
+		int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 		const u8 *data = buf + data_off;
 		const u8 *oob = nand->oob_poi + oob_off;
 
@@ -1257,7 +1268,7 @@ static int sunxi_nfc_hw_ecc_write_subpage(struct nand_chip *nand,
 	for (i = data_offs / ecc->size;
 	     i < DIV_ROUND_UP(data_offs + data_len, ecc->size); i++) {
 		int data_off = i * ecc->size;
-		int oob_off = i * (ecc->bytes + 4);
+		int oob_off = i * (ecc->bytes + USER_DATA_SZ);
 		const u8 *data = buf + data_off;
 		const u8 *oob = nand->oob_poi + oob_off;
 
@@ -1296,7 +1307,7 @@ static int sunxi_nfc_hw_ecc_write_page_dma(struct nand_chip *nand,
 		goto pio_fallback;
 
 	for (i = 0; i < ecc->steps; i++) {
-		const u8 *oob = nand->oob_poi + (i * (ecc->bytes + 4));
+		const u8 *oob = nand->oob_poi + (i * (ecc->bytes + USER_DATA_SZ));
 
 		sunxi_nfc_hw_ecc_set_prot_oob_bytes(nand, oob, i, !i, page);
 	}
@@ -1566,7 +1577,7 @@ static int sunxi_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
 	if (section >= ecc->steps)
 		return -ERANGE;
 
-	oobregion->offset = section * (ecc->bytes + 4) + 4;
+	oobregion->offset = section * (ecc->bytes + USER_DATA_SZ) + 4;
 	oobregion->length = ecc->bytes;
 
 	return 0;
@@ -1600,10 +1611,10 @@ static int sunxi_nand_ooblayout_free(struct mtd_info *mtd, int section,
 	if (section == ecc->steps && ecc->engine_type == NAND_ECC_ENGINE_TYPE_ON_HOST)
 		return -ERANGE;
 
-	oobregion->offset = section * (ecc->bytes + 4);
+	oobregion->offset = section * (ecc->bytes + USER_DATA_SZ);
 
 	if (section < ecc->steps)
-		oobregion->length = 4;
+		oobregion->length = USER_DATA_SZ;
 	else
 		oobregion->length = mtd->oobsize - oobregion->offset;
 
@@ -1637,7 +1648,7 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 		bytes = (mtd->oobsize - 2) / nsectors;
 
 		/* 4 non-ECC bytes are added before each ECC bytes section */
-		bytes -= 4;
+		bytes -= USER_DATA_SZ;
 
 		/* and bytes has to be even. */
 		if (bytes % 2)
@@ -1690,7 +1701,7 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand,
 
 	nsectors = mtd->writesize / ecc->size;
 
-	if (mtd->oobsize < ((ecc->bytes + 4) * nsectors))
+	if (mtd->oobsize < ((ecc->bytes + USER_DATA_SZ) * nsectors))
 		return -EINVAL;
 
 	ecc->read_oob = sunxi_nfc_hw_ecc_read_oob;