Merge tag 'nand/for-4.10' of github.com:linux-nand/linux

From Boris Brezillon:

"""
This pull request contains the following notable changes:
- new tango NAND controller driver
- new ox820 NAND controller driver
- addition of a new full-ID entry in the nand_ids table
- rework of the s3c240 driver to support DT
- extension of the nand_sdr_timings to expose tCCS, tPROG and tR
- addition of a new flag to ask the core to wait for tCCS when sending
  a RNDIN/RNDOUT command
- addition of a new flag to ask the core to let the controller driver
  send the READ/PROGPAGE command

This pull request also contains minor fixes/cleanup/cosmetic changes:
- properly support 512 ECC step size in the sunxi driver
- improve the error messages in the pxa probe path
- fix module autoload in the omap2 driver
- cleanup of several nand drivers to return nand_scan{_tail}() error
  code instead of returning -EIO
- various cleanups in the denali driver
- cleanups in the ooblayout handling (MTD core)
- fix an error check in nandsim
"""

37 files changed, 1292 insertions, 317 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index d46e4adf6d2b..ca661cee9b77 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1274,8 +1274,8 @@ static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
 					    int section,
 					    struct mtd_oob_region *oobregion))
 {
-	struct mtd_oob_region oobregion = { };
-	int section = 0, ret;
+	struct mtd_oob_region oobregion;
+	int section, ret;
 
 	ret = mtd_ooblayout_find_region(mtd, start, &section,
 					&oobregion, iter);
@@ -1283,7 +1283,7 @@ static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
 	while (!ret) {
 		int cnt;
 
-		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		cnt = min_t(int, nbytes, oobregion.length);
 		memcpy(buf, oobbuf + oobregion.offset, cnt);
 		buf += cnt;
 		nbytes -= cnt;
@@ -1317,8 +1317,8 @@ static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
 					    int section,
 					    struct mtd_oob_region *oobregion))
 {
-	struct mtd_oob_region oobregion = { };
-	int section = 0, ret;
+	struct mtd_oob_region oobregion;
+	int section, ret;
 
 	ret = mtd_ooblayout_find_region(mtd, start, &section,
 					&oobregion, iter);
@@ -1326,7 +1326,7 @@ static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
 	while (!ret) {
 		int cnt;
 
-		cnt = oobregion.length > nbytes ? nbytes : oobregion.length;
+		cnt = min_t(int, nbytes, oobregion.length);
 		memcpy(oobbuf + oobregion.offset, buf, cnt);
 		buf += cnt;
 		nbytes -= cnt;
@@ -1354,7 +1354,7 @@ static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
 					    int section,
 					    struct mtd_oob_region *oobregion))
 {
-	struct mtd_oob_region oobregion = { };
+	struct mtd_oob_region oobregion;
 	int section = 0, ret, nbytes = 0;
 
 	while (1) {
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 7b7a887b4709..353a9ddf6b97 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -179,15 +179,6 @@ config MTD_NAND_S3C2410_DEBUG
 	help
 	  Enable debugging of the S3C NAND driver
 
-config MTD_NAND_S3C2410_HWECC
-	bool "Samsung S3C NAND Hardware ECC"
-	depends on MTD_NAND_S3C2410
-	help
-	  Enable the use of the controller's internal ECC generator when
-	  using NAND. Early versions of the chips have had problems with
-	  incorrect ECC generation, and if using these, the default of
-	  software ECC is preferable.
-
 config MTD_NAND_NDFC
 	tristate "NDFC NanD Flash Controller"
 	depends on 4xx
@@ -205,6 +196,13 @@ config MTD_NAND_S3C2410_CLKSTOP
 	  when the is NAND chip selected or released, but will save
 	  approximately 5mA of power when there is nothing happening.
 
+config MTD_NAND_TANGO
+	tristate "NAND Flash support for Tango chips"
+	depends on ARCH_TANGO || COMPILE_TEST
+	depends on HAS_DMA
+	help
+	  Enables the NAND Flash controller on Tango chips.
+
 config MTD_NAND_DISKONCHIP
 	tristate "DiskOnChip 2000, Millennium and Millennium Plus (NAND reimplementation)"
 	depends on HAS_IOMEM
@@ -426,6 +424,11 @@ config MTD_NAND_ORION
 	  No board specific support is done by this driver, each board
 	  must advertise a platform_device for the driver to attach.
 
+config MTD_NAND_OXNAS
+	tristate "NAND Flash support for Oxford Semiconductor SoC"
+	help
+	  This enables the NAND flash controller on Oxford Semiconductor SoCs.
+
 config MTD_NAND_FSL_ELBC
 	tristate "NAND support for Freescale eLBC controllers"
 	depends on FSL_SOC
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index cafde6f3d957..19a66e404d5b 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_MTD_NAND_DENALI_DT)	+= denali_dt.o
 obj-$(CONFIG_MTD_NAND_AU1550)		+= au1550nd.o
 obj-$(CONFIG_MTD_NAND_BF5XX)		+= bf5xx_nand.o
 obj-$(CONFIG_MTD_NAND_S3C2410)		+= s3c2410.o
+obj-$(CONFIG_MTD_NAND_TANGO)		+= tango_nand.o
 obj-$(CONFIG_MTD_NAND_DAVINCI)		+= davinci_nand.o
 obj-$(CONFIG_MTD_NAND_DISKONCHIP)	+= diskonchip.o
 obj-$(CONFIG_MTD_NAND_DOCG4)		+= docg4.o
@@ -35,6 +36,7 @@ obj-$(CONFIG_MTD_NAND_TMIO)		+= tmio_nand.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)		+= plat_nand.o
 obj-$(CONFIG_MTD_NAND_PASEMI)		+= pasemi_nand.o
 obj-$(CONFIG_MTD_NAND_ORION)		+= orion_nand.o
+obj-$(CONFIG_MTD_NAND_OXNAS)		+= oxnas_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_ELBC)		+= fsl_elbc_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_IFC)		+= fsl_ifc_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_UPM)		+= fsl_upm.o
diff --git a/drivers/mtd/nand/ams-delta.c b/drivers/mtd/nand/ams-delta.c
index 78e12cc8bac2..5d6c26f3cf7f 100644
--- a/drivers/mtd/nand/ams-delta.c
+++ b/drivers/mtd/nand/ams-delta.c
@@ -234,10 +234,9 @@ static int ams_delta_init(struct platform_device *pdev)
 		goto out_gpio;
 
 	/* Scan to find existence of the device */
-	if (nand_scan(ams_delta_mtd, 1)) {
-		err = -ENXIO;
+	err = nand_scan(ams_delta_mtd, 1);
+	if (err)
 		goto out_mtd;
-	}
 
 	/* Register the partitions */
 	mtd_device_register(ams_delta_mtd, partition_info,
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 68b9160108c9..9ebd5ecefea6 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -2267,10 +2267,9 @@ static int atmel_nand_probe(struct platform_device *pdev)
 		dev_info(host->dev, "No DMA support for NAND access.\n");
 
 	/* first scan to find the device and get the page size */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		res = -ENXIO;
+	res = nand_scan_ident(mtd, 1, NULL);
+	if (res)
 		goto err_scan_ident;
-	}
 
 	if (host->board.on_flash_bbt || on_flash_bbt)
 		nand_chip->bbt_options |= NAND_BBT_USE_FLASH;
@@ -2304,10 +2303,9 @@ static int atmel_nand_probe(struct platform_device *pdev)
 	}
 
 	/* second phase scan */
-	if (nand_scan_tail(mtd)) {
-		res = -ENXIO;
+	res = nand_scan_tail(mtd);
+	if (res)
 		goto err_scan_tail;
-	}
 
 	mtd->name = "atmel_nand";
 	res = mtd_device_register(mtd, host->board.parts,
diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index 9d2424bfdbf5..42ebd73f821d 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -2209,8 +2209,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	nand_writereg(ctrl, cfg_offs,
 		      nand_readreg(ctrl, cfg_offs) & ~CFG_BUS_WIDTH);
 
-	if (nand_scan_ident(mtd, 1, NULL))
-		return -ENXIO;
+	ret = nand_scan_ident(mtd, 1, NULL);
+	if (ret)
+		return ret;
 
 	chip->options |= NAND_NO_SUBPAGE_WRITE;
 	/*
@@ -2234,8 +2235,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	if (ret)
 		return ret;
 
-	if (nand_scan_tail(mtd))
-		return -ENXIO;
+	ret = nand_scan_tail(mtd);
+	if (ret)
+		return ret;
 
 	return mtd_device_register(mtd, NULL, 0);
 }
diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
index 0b0c93702abb..d40c32d311d8 100644
--- a/drivers/mtd/nand/cafe_nand.c
+++ b/drivers/mtd/nand/cafe_nand.c
@@ -725,10 +725,9 @@ static int cafe_nand_probe(struct pci_dev *pdev,
 	usedma = 0;
 
 	/* Scan to find existence of the device */
-	if (nand_scan_ident(mtd, 2, NULL)) {
-		err = -ENXIO;
+	err = nand_scan_ident(mtd, 2, NULL);
+	if (err)
 		goto out_irq;
-	}
 
 	cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev,
 				2112 + sizeof(struct nand_buffers) +
diff --git a/drivers/mtd/nand/cmx270_nand.c b/drivers/mtd/nand/cmx270_nand.c
index 49133783ca53..226ac0bcafc6 100644
--- a/drivers/mtd/nand/cmx270_nand.c
+++ b/drivers/mtd/nand/cmx270_nand.c
@@ -195,9 +195,9 @@ static int __init cmx270_init(void)
 	this->write_buf = cmx270_write_buf;
 
 	/* Scan to find existence of the device */
-	if (nand_scan (cmx270_nand_mtd, 1)) {
+	ret = nand_scan(cmx270_nand_mtd, 1);
+	if (ret) {
 		pr_notice("No NAND device\n");
-		ret = -ENXIO;
 		goto err_scan;
 	}
 
diff --git a/drivers/mtd/nand/cs553x_nand.c b/drivers/mtd/nand/cs553x_nand.c
index a65e4e0f57a1..594b28684138 100644
--- a/drivers/mtd/nand/cs553x_nand.c
+++ b/drivers/mtd/nand/cs553x_nand.c
@@ -242,10 +242,9 @@ static int __init cs553x_init_one(int cs, int mmio, unsigned long adr)
 	}
 
 	/* Scan to find existence of the device */
-	if (nand_scan(new_mtd, 1)) {
-		err = -ENXIO;
+	err = nand_scan(new_mtd, 1);
+	if (err)
 		goto out_free;
-	}
 
 	cs553x_mtd[cs] = new_mtd;
 	goto out;
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 0476ae8776d9..73b9d4e2dca0 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -21,7 +21,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/wait.h>
 #include <linux/mutex.h>
-#include <linux/slab.h>
 #include <linux/mtd/mtd.h>
 #include <linux/module.h>
 
@@ -182,9 +181,6 @@ static uint16_t denali_nand_reset(struct denali_nand_info *denali)
 {
 	int i;
 
-	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
-		__FILE__, __LINE__, __func__);
-
 	for (i = 0; i < denali->max_banks; i++)
 		iowrite32(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT,
 		denali->flash_reg + INTR_STATUS(i));
@@ -234,9 +230,6 @@ static void nand_onfi_timing_set(struct denali_nand_info *denali,
 	uint16_t acc_clks;
 	uint16_t addr_2_data, re_2_we, re_2_re, we_2_re, cs_cnt;
 
-	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
-		__FILE__, __LINE__, __func__);
-
 	en_lo = CEIL_DIV(Trp[mode], CLK_X);
 	en_hi = CEIL_DIV(Treh[mode], CLK_X);
 #if ONFI_BLOOM_TIME
@@ -403,7 +396,7 @@ static void get_hynix_nand_para(struct denali_nand_info *denali,
 		break;
 	default:
 		dev_warn(denali->dev,
-			 "Spectra: Unknown Hynix NAND (Device ID: 0x%x).\n"
+			 "Unknown Hynix NAND (Device ID: 0x%x).\n"
 			 "Will use default parameter values instead.\n",
 			 device_id);
 	}
@@ -474,33 +467,6 @@ static void detect_max_banks(struct denali_nand_info *denali)
 		denali->max_banks = 1 << (features & FEATURES__N_BANKS);
 }
 
-static void detect_partition_feature(struct denali_nand_info *denali)
-{
-	/*
-	 * For MRST platform, denali->fwblks represent the
-	 * number of blocks firmware is taken,
-	 * FW is in protect partition and MTD driver has no
-	 * permission to access it. So let driver know how many
-	 * blocks it can't touch.
-	 */
-	if (ioread32(denali->flash_reg + FEATURES) & FEATURES__PARTITION) {
-		if ((ioread32(denali->flash_reg + PERM_SRC_ID(1)) &
-			PERM_SRC_ID__SRCID) == SPECTRA_PARTITION_ID) {
-			denali->fwblks =
-			    ((ioread32(denali->flash_reg + MIN_MAX_BANK(1)) &
-			      MIN_MAX_BANK__MIN_VALUE) *
-			     denali->blksperchip)
-			    +
-			    (ioread32(denali->flash_reg + MIN_BLK_ADDR(1)) &
-			    MIN_BLK_ADDR__VALUE);
-		} else {
-			denali->fwblks = SPECTRA_START_BLOCK;
-		}
-	} else {
-		denali->fwblks = SPECTRA_START_BLOCK;
-	}
-}
-
 static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
 {
 	uint16_t status = PASS;
@@ -508,9 +474,6 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
 	uint8_t maf_id, device_id;
 	int i;
 
-	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
-			__FILE__, __LINE__, __func__);
-
 	/*
 	 * Use read id method to get device ID and other params.
 	 * For some NAND chips, controller can't report the correct
@@ -552,8 +515,6 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
 
 	find_valid_banks(denali);
 
-	detect_partition_feature(denali);
-
 	/*
 	 * If the user specified to override the default timings
 	 * with a specific ONFI mode, we apply those changes here.
@@ -567,9 +528,6 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
 static void denali_set_intr_modes(struct denali_nand_info *denali,
 					uint16_t INT_ENABLE)
 {
-	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
-		__FILE__, __LINE__, __func__);
-
 	if (INT_ENABLE)
 		iowrite32(1, denali->flash_reg + GLOBAL_INT_ENABLE);
 	else
@@ -605,7 +563,6 @@ static void denali_irq_init(struct denali_nand_info *denali)
 static void denali_irq_cleanup(int irqnum, struct denali_nand_info *denali)
 {
 	denali_set_intr_modes(denali, false);
-	free_irq(irqnum, denali);
 }
 
 static void denali_irq_enable(struct denali_nand_info *denali,
@@ -1437,9 +1394,6 @@ static struct nand_bbt_descr bbt_mirror_descr = {
 /* initialize driver data structures */
 static void denali_drv_init(struct denali_nand_info *denali)
 {
-	denali->idx = 0;
-
-	/* setup interrupt handler */
 	/*
 	 * the completion object will be used to notify
 	 * the callee that the interrupt is done
@@ -1485,14 +1439,12 @@ int denali_init(struct denali_nand_info *denali)
 	denali_hw_init(denali);
 	denali_drv_init(denali);
 
-	/*
-	 * denali_isr register is done after all the hardware
-	 * initilization is finished
-	 */
-	if (request_irq(denali->irq, denali_isr, IRQF_SHARED,
-			DENALI_NAND_NAME, denali)) {
-		pr_err("Spectra: Unable to allocate IRQ\n");
-		return -ENODEV;
+	/* Request IRQ after all the hardware initialization is finished */
+	ret = devm_request_irq(denali->dev, denali->irq, denali_isr,
+			       IRQF_SHARED, DENALI_NAND_NAME, denali);
+	if (ret) {
+		dev_err(denali->dev, "Unable to request IRQ\n");
+		return ret;
 	}
 
 	/* now that our ISR is registered, we can enable interrupts */
@@ -1510,10 +1462,9 @@ int denali_init(struct denali_nand_info *denali)
 	 * this is the first stage in a two step process to register
 	 * with the nand subsystem
 	 */
-	if (nand_scan_ident(mtd, denali->max_banks, NULL)) {
-		ret = -ENXIO;
+	ret = nand_scan_ident(mtd, denali->max_banks, NULL);
+	if (ret)
 		goto failed_req_irq;
-	}
 
 	/* allocate the right size buffer now */
 	devm_kfree(denali->dev, denali->buf.buf);
@@ -1528,7 +1479,7 @@ int denali_init(struct denali_nand_info *denali)
 	/* Is 32-bit DMA supported? */
 	ret = dma_set_mask(denali->dev, DMA_BIT_MASK(32));
 	if (ret) {
-		pr_err("Spectra: no usable DMA configuration\n");
+		dev_err(denali->dev, "No usable DMA configuration\n");
 		goto failed_req_irq;
 	}
 
@@ -1536,7 +1487,7 @@ int denali_init(struct denali_nand_info *denali)
 			     mtd->writesize + mtd->oobsize,
 			     DMA_BIDIRECTIONAL);
 	if (dma_mapping_error(denali->dev, denali->buf.dma_buf)) {
-		dev_err(denali->dev, "Spectra: failed to map DMA buffer\n");
+		dev_err(denali->dev, "Failed to map DMA buffer\n");
 		ret = -EIO;
 		goto failed_req_irq;
 	}
@@ -1547,16 +1498,16 @@ int denali_init(struct denali_nand_info *denali)
 	 * the real pagesize and anything necessery
 	 */
 	denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
-	denali->nand.chipsize <<= (denali->devnum - 1);
-	denali->nand.page_shift += (denali->devnum - 1);
+	denali->nand.chipsize <<= denali->devnum - 1;
+	denali->nand.page_shift += denali->devnum - 1;
 	denali->nand.pagemask = (denali->nand.chipsize >>
 						denali->nand.page_shift) - 1;
-	denali->nand.bbt_erase_shift += (denali->devnum - 1);
+	denali->nand.bbt_erase_shift += denali->devnum - 1;
 	denali->nand.phys_erase_shift = denali->nand.bbt_erase_shift;
-	denali->nand.chip_shift += (denali->devnum - 1);
-	mtd->writesize <<= (denali->devnum - 1);
-	mtd->oobsize <<= (denali->devnum - 1);
-	mtd->erasesize <<= (denali->devnum - 1);
+	denali->nand.chip_shift += denali->devnum - 1;
+	mtd->writesize <<= denali->devnum - 1;
+	mtd->oobsize <<= denali->devnum - 1;
+	mtd->erasesize <<= denali->devnum - 1;
 	mtd->size = denali->nand.numchips * denali->nand.chipsize;
 	denali->bbtskipbytes *= denali->devnum;
 
@@ -1606,14 +1557,6 @@ int denali_init(struct denali_nand_info *denali)
 	denali->nand.ecc.bytes *= denali->devnum;
 	denali->nand.ecc.strength *= denali->devnum;
 
-	/*
-	 * Let driver know the total blocks number and how many blocks
-	 * contained by each nand chip. blksperchip will help driver to
-	 * know how many blocks is taken by FW.
-	 */
-	denali->totalblks = mtd->size >> denali->nand.phys_erase_shift;
-	denali->blksperchip = denali->totalblks / denali->nand.numchips;
-
 	/* override the default read operations */
 	denali->nand.ecc.size = ECC_SECTOR_SIZE * denali->devnum;
 	denali->nand.ecc.read_page = denali_read_page;
@@ -1624,15 +1567,13 @@ int denali_init(struct denali_nand_info *denali)
 	denali->nand.ecc.write_oob = denali_write_oob;
 	denali->nand.erase = denali_erase;
 
-	if (nand_scan_tail(mtd)) {
-		ret = -ENXIO;
+	ret = nand_scan_tail(mtd);
+	if (ret)
 		goto failed_req_irq;
-	}
 
 	ret = mtd_device_register(mtd, NULL, 0);
 	if (ret) {
-		dev_err(denali->dev, "Spectra: Failed to register MTD: %d\n",
-				ret);
+		dev_err(denali->dev, "Failed to register MTD: %d\n", ret);
 		goto failed_req_irq;
 	}
 	return 0;
diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h
index e7ab4866a5da..ea22191e8515 100644
--- a/drivers/mtd/nand/denali.h
+++ b/drivers/mtd/nand/denali.h
@@ -383,14 +383,6 @@
 #define CLK_X  5
 #define CLK_MULTI 4
 
-/* spectraswconfig.h */
-#define CMD_DMA 0
-
-#define SPECTRA_PARTITION_ID    0
-/**** Block Table and Reserved Block Parameters *****/
-#define SPECTRA_START_BLOCK     3
-#define NUM_FREE_BLOCKS_GATE    30
-
 /* KBV - Updated to LNW scratch register address */
 #define SCRATCH_REG_ADDR    CONFIG_MTD_NAND_DENALI_SCRATCH_REG_ADDR
 #define SCRATCH_REG_SIZE    64
@@ -467,13 +459,9 @@ struct denali_nand_info {
 	spinlock_t irq_lock;
 	uint32_t irq_status;
 	int irq_debug_array[32];
-	int idx;
 	int irq;
 
 	uint32_t devnum;	/* represent how many nands connected */
-	uint32_t fwblks; /* represent how many blocks FW used */
-	uint32_t totalblks;
-	uint32_t blksperchip;
 	uint32_t bbtskipbytes;
 	uint32_t max_banks;
 };
diff --git a/drivers/mtd/nand/denali_dt.c b/drivers/mtd/nand/denali_dt.c
index 0cb1e8d9fbfc..5607fcd3b8ed 100644
--- a/drivers/mtd/nand/denali_dt.c
+++ b/drivers/mtd/nand/denali_dt.c
@@ -21,7 +21,6 @@
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/slab.h>
 
 #include "denali.h"
 
@@ -110,7 +109,7 @@ static int denali_dt_remove(struct platform_device *ofdev)
 	struct denali_dt *dt = platform_get_drvdata(ofdev);
 
 	denali_remove(&dt->denali);
-	clk_disable(dt->clk);
+	clk_disable_unprepare(dt->clk);
 
 	return 0;
 }
diff --git a/drivers/mtd/nand/denali_pci.c b/drivers/mtd/nand/denali_pci.c
index de31514df282..ac843238b77e 100644
--- a/drivers/mtd/nand/denali_pci.c
+++ b/drivers/mtd/nand/denali_pci.c
@@ -14,7 +14,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
-#include <linux/slab.h>
 
 #include "denali.h"
 
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index d4f454a4b35e..4924b43977ef 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -926,8 +926,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	/*
 	 * Scan to find existence of the device
 	 */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		ret = -ENXIO;
+	ret = nand_scan_ident(mtd, 1, NULL);
+	if (ret) {
 		dev_err(&pdev->dev, "No NAND Device found!\n");
 		goto err_scan_ident;
 	}
@@ -992,10 +992,9 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Second stage of scan to fill MTD data-structures */
-	if (nand_scan_tail(mtd)) {
-		ret = -ENXIO;
+	ret = nand_scan_tail(mtd);
+	if (ret)
 		goto err_probe;
-	}
 
 	/*
 	 * The partition information can is accessed by (in the same precedence)
diff --git a/drivers/mtd/nand/gpio.c b/drivers/mtd/nand/gpio.c
index 6317f6836022..0d24857469ab 100644
--- a/drivers/mtd/nand/gpio.c
+++ b/drivers/mtd/nand/gpio.c
@@ -286,10 +286,9 @@ static int gpio_nand_probe(struct platform_device *pdev)
 	if (gpio_is_valid(gpiomtd->plat.gpio_nwp))
 		gpio_direction_output(gpiomtd->plat.gpio_nwp, 1);
 
-	if (nand_scan(mtd, 1)) {
-		ret = -ENXIO;
+	ret = nand_scan(mtd, 1);
+	if (ret)
 		goto err_wp;
-	}
 
 	if (gpiomtd->plat.adjust_parts)
 		gpiomtd->plat.adjust_parts(&gpiomtd->plat, mtd->size);
diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
index 9432546f4cd4..e40364eeb556 100644
--- a/drivers/mtd/nand/hisi504_nand.c
+++ b/drivers/mtd/nand/hisi504_nand.c
@@ -774,10 +774,8 @@ static int hisi_nfc_probe(struct platform_device *pdev)
 	}
 
 	ret = nand_scan_ident(mtd, max_chips, NULL);
-	if (ret) {
-		ret = -ENODEV;
+	if (ret)
 		goto err_res;
-	}
 
 	host->buffer = dmam_alloc_coherent(dev, mtd->writesize + mtd->oobsize,
 		&host->dma_buffer, GFP_KERNEL);
diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index 852388171f20..5553a5d9efd1 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.c
@@ -747,10 +747,9 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * Scan to find existance of the device and
 	 * Get the type of NAND device SMALL block or LARGE block
 	 */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		res = -ENXIO;
+	res = nand_scan_ident(mtd, 1, NULL);
+	if (res)
 		goto err_exit3;
-	}
 
 	host->dma_buf = devm_kzalloc(&pdev->dev, mtd->writesize, GFP_KERNEL);
 	if (!host->dma_buf) {
@@ -793,10 +792,9 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	 * Fills out all the uninitialized function pointers with the defaults
 	 * And scans for a bad block table if appropriate.
 	 */
-	if (nand_scan_tail(mtd)) {
-		res = -ENXIO;
+	res = nand_scan_tail(mtd);
+	if (res)
 		goto err_exit4;
-	}
 
 	mtd->name = DRV_NAME;
 
diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 8d3edc34958e..53bafe23ab39 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -894,10 +894,9 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Find NAND device */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		res = -ENXIO;
+	res = nand_scan_ident(mtd, 1, NULL);
+	if (res)
 		goto err_exit3;
-	}
 
 	/* OOB and ECC CPU and DMA work areas */
 	host->ecc_buf = (uint32_t *)(host->data_buf + LPC32XX_DMA_DATA_SIZE);
@@ -929,10 +928,9 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	/*
 	 * Fills out all the uninitialized function pointers with the defaults
 	 */
-	if (nand_scan_tail(mtd)) {
-		res = -ENXIO;
+	res = nand_scan_tail(mtd);
+	if (res)
 		goto err_exit3;
-	}
 
 	mtd->name = "nxp_lpc3220_slc";
 	res = mtd_device_register(mtd, host->ncfg->parts,
diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
index 7eacb2f545f5..6d6eaed2d20c 100644
--- a/drivers/mtd/nand/mpc5121_nfc.c
+++ b/drivers/mtd/nand/mpc5121_nfc.c
@@ -777,9 +777,9 @@ static int mpc5121_nfc_probe(struct platform_device *op)
 	}
 
 	/* Detect NAND chips */
-	if (nand_scan(mtd, be32_to_cpup(chips_no))) {
+	retval = nand_scan(mtd, be32_to_cpup(chips_no));
+	if (retval) {
 		dev_err(dev, "NAND Flash not found !\n");
-		retval = -ENXIO;
 		goto error;
 	}
 
diff --git a/drivers/mtd/nand/mtk_nand.c b/drivers/mtd/nand/mtk_nand.c
index 5223a2182ee4..6c3eed3c2094 100644
--- a/drivers/mtd/nand/mtk_nand.c
+++ b/drivers/mtd/nand/mtk_nand.c
@@ -1297,7 +1297,7 @@ static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
 
 	ret = nand_scan_ident(mtd, nsels, NULL);
 	if (ret)
-		return -ENODEV;
+		return ret;
 
 	/* store bbt magic in page, cause OOB is not protected */
 	if (nand->bbt_options & NAND_BBT_USE_FLASH)
@@ -1323,7 +1323,7 @@ static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
 
 	ret = nand_scan_tail(mtd);
 	if (ret)
-		return -ENODEV;
+		return ret;
 
 	ret = mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
 	if (ret) {
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index d7f724b24fd7..61ca020c5272 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1747,10 +1747,9 @@ static int mxcnd_probe(struct platform_device *pdev)
 	}
 
 	/* first scan to find the device and get the page size */
-	if (nand_scan_ident(mtd, is_imx25_nfc(host) ? 4 : 1, NULL)) {
-		err = -ENXIO;
+	err = nand_scan_ident(mtd, is_imx25_nfc(host) ? 4 : 1, NULL);
+	if (err)
 		goto escan;
-	}
 
 	switch (this->ecc.mode) {
 	case NAND_ECC_HW:
@@ -1808,10 +1807,9 @@ static int mxcnd_probe(struct platform_device *pdev)
 	}
 
 	/* second phase scan */
-	if (nand_scan_tail(mtd)) {
-		err = -ENXIO;
+	err = nand_scan_tail(mtd);
+	if (err)
 		goto escan;
-	}
 
 	/* Register the partitions */
 	mtd_device_parse_register(mtd, part_probes,
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 3bde96a3f7bf..ec1c28aaaf23 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -709,6 +709,25 @@ static void nand_command(struct mtd_info *mtd, unsigned int command,
 	nand_wait_ready(mtd);
 }
 
+static void nand_ccs_delay(struct nand_chip *chip)
+{
+	/*
+	 * The controller already takes care of waiting for tCCS when the RNDIN
+	 * or RNDOUT command is sent, return directly.
+	 */
+	if (!(chip->options & NAND_WAIT_TCCS))
+		return;
+
+	/*
+	 * Wait tCCS_min if it is correctly defined, otherwise wait 500ns
+	 * (which should be safe for all NANDs).
+	 */
+	if (chip->data_interface && chip->data_interface->timings.sdr.tCCS_min)
+		ndelay(chip->data_interface->timings.sdr.tCCS_min / 1000);
+	else
+		ndelay(500);
+}
+
 /**
  * nand_command_lp - [DEFAULT] Send command to NAND large page device
  * @mtd: MTD device structure
@@ -773,10 +792,13 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
 	case NAND_CMD_ERASE1:
 	case NAND_CMD_ERASE2:
 	case NAND_CMD_SEQIN:
-	case NAND_CMD_RNDIN:
 	case NAND_CMD_STATUS:
 		return;
 
+	case NAND_CMD_RNDIN:
+		nand_ccs_delay(chip);
+		return;
+
 	case NAND_CMD_RESET:
 		if (chip->dev_ready)
 			break;
@@ -795,6 +817,8 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
 			       NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
 		chip->cmd_ctrl(mtd, NAND_CMD_NONE,
 			       NAND_NCE | NAND_CTRL_CHANGE);
+
+		nand_ccs_delay(chip);
 		return;
 
 	case NAND_CMD_READ0:
@@ -1946,7 +1970,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
 						 __func__, buf);
 
 read_retry:
-			chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
+			if (nand_standard_page_accessors(&chip->ecc))
+				chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
 
 			/*
 			 * Now read the page into the buffer.  Absent an error,
@@ -2634,7 +2659,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 	else
 		subpage = 0;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+	if (nand_standard_page_accessors(&chip->ecc))
+		chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
 
 	if (unlikely(raw))
 		status = chip->ecc.write_page_raw(mtd, chip, buf,
@@ -2657,7 +2683,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 
 	if (!cached || !NAND_HAS_CACHEPROG(chip)) {
 
-		chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+		if (nand_standard_page_accessors(&chip->ecc))
+			chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
 		status = chip->waitfunc(mtd, chip);
 		/*
 		 * See if operation failed and additional status checks are
@@ -3985,10 +4012,9 @@ static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip,
 /*
  * Get the flash and manufacturer id and lookup if the type is supported.
  */
-static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
-						  struct nand_chip *chip,
-						  int *maf_id, int *dev_id,
-						  struct nand_flash_dev *type)
+static int nand_get_flash_type(struct mtd_info *mtd, struct nand_chip *chip,
+			       int *maf_id, int *dev_id,
+			       struct nand_flash_dev *type)
 {
 	int busw;
 	int i, maf_idx;
@@ -4026,7 +4052,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 	if (id_data[0] != *maf_id || id_data[1] != *dev_id) {
 		pr_info("second ID read did not match %02x,%02x against %02x,%02x\n",
 			*maf_id, *dev_id, id_data[0], id_data[1]);
-		return ERR_PTR(-ENODEV);
+		return -ENODEV;
 	}
 
 	if (!type)
@@ -4053,7 +4079,7 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 	}
 
 	if (!type->name)
-		return ERR_PTR(-ENODEV);
+		return -ENODEV;
 
 	if (!mtd->name)
 		mtd->name = type->name;
@@ -4098,7 +4124,7 @@ ident_done:
 		pr_warn("bus width %d instead %d bit\n",
 			   (chip->options & NAND_BUSWIDTH_16) ? 16 : 8,
 			   busw ? 16 : 8);
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 	}
 
 	nand_decode_bbm_options(mtd, chip, id_data);
@@ -4140,7 +4166,7 @@ ident_done:
 	pr_info("%d MiB, %s, erase size: %d KiB, page size: %d, OOB size: %d\n",
 		(int)(chip->chipsize >> 20), nand_is_slc(chip) ? "SLC" : "MLC",
 		mtd->erasesize >> 10, mtd->writesize, mtd->oobsize);
-	return type;
+	return 0;
 }
 
 static const char * const nand_ecc_modes[] = {
@@ -4306,7 +4332,6 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
 {
 	int i, nand_maf_id, nand_dev_id;
 	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct nand_flash_dev *type;
 	int ret;
 
 	ret = nand_dt_init(chip);
@@ -4329,14 +4354,12 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
 	nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
 
 	/* Read the flash type */
-	type = nand_get_flash_type(mtd, chip, &nand_maf_id,
-				   &nand_dev_id, table);
-
-	if (IS_ERR(type)) {
+	ret = nand_get_flash_type(mtd, chip, &nand_maf_id, &nand_dev_id, table);
+	if (ret) {
 		if (!(chip->options & NAND_SCAN_SILENT_NODEV))
 			pr_warn("No NAND device found\n");
 		chip->select_chip(mtd, -1);
-		return PTR_ERR(type);
+		return ret;
 	}
 
 	/* Initialize the ->data_interface field. */
@@ -4515,6 +4538,26 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
 	return corr >= ds_corr && ecc->strength >= chip->ecc_strength_ds;
 }
 
+static bool invalid_ecc_page_accessors(struct nand_chip *chip)
+{
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (nand_standard_page_accessors(ecc))
+		return false;
+
+	/*
+	 * NAND_ECC_CUSTOM_PAGE_ACCESS flag is set, make sure the NAND
+	 * controller driver implements all the page accessors because
+	 * default helpers are not suitable when the core does not
+	 * send the READ0/PAGEPROG commands.
+	 */
+	return (!ecc->read_page || !ecc->write_page ||
+		!ecc->read_page_raw || !ecc->write_page_raw ||
+		(NAND_HAS_SUBPAGE_READ(chip) && !ecc->read_subpage) ||
+		(NAND_HAS_SUBPAGE_WRITE(chip) && !ecc->write_subpage &&
+		 ecc->hwctl && ecc->calculate));
+}
+
 /**
  * nand_scan_tail - [NAND Interface] Scan for the NAND device
  * @mtd: MTD device structure
@@ -4535,6 +4578,11 @@ int nand_scan_tail(struct mtd_info *mtd)
 		   !(chip->bbt_options & NAND_BBT_USE_FLASH)))
 		return -EINVAL;
 
+	if (invalid_ecc_page_accessors(chip)) {
+		pr_err("Invalid ECC page accessors setup\n");
+		return -EINVAL;
+	}
+
 	if (!(chip->options & NAND_OWN_BUFFERS)) {
 		nbuf = kzalloc(sizeof(*nbuf) + mtd->writesize
 				+ mtd->oobsize * 3, GFP_KERNEL);
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index 2af9869a115e..b3a332f37e14 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -36,6 +36,9 @@ struct nand_flash_dev nand_flash_ids[] = {
 	{"TC58NVG2S0F 4G 3.3V 8-bit",
 		{ .id = {0x98, 0xdc, 0x90, 0x26, 0x76, 0x15, 0x01, 0x08} },
 		  SZ_4K, SZ_512, SZ_256K, 0, 8, 224, NAND_ECC_INFO(4, SZ_512) },
+	{"TC58NVG2S0H 4G 3.3V 8-bit",
+		{ .id = {0x98, 0xdc, 0x90, 0x26, 0x76, 0x16, 0x08, 0x00} },
+		  SZ_4K, SZ_512, SZ_256K, 0, 8, 256, NAND_ECC_INFO(8, SZ_512) },
 	{"TC58NVG3S0F 8G 3.3V 8-bit",
 		{ .id = {0x98, 0xd3, 0x90, 0x26, 0x76, 0x15, 0x02, 0x08} },
 		  SZ_4K, SZ_1K, SZ_256K, 0, 8, 232, NAND_ECC_INFO(4, SZ_512) },
diff --git a/drivers/mtd/nand/nand_timings.c b/drivers/mtd/nand/nand_timings.c
index 13a587407be3..f06312df3669 100644
--- a/drivers/mtd/nand/nand_timings.c
+++ b/drivers/mtd/nand/nand_timings.c
@@ -18,6 +18,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 20000,
 			.tALS_min = 50000,
@@ -58,6 +60,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 10000,
 			.tALS_min = 25000,
@@ -98,6 +102,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 10000,
 			.tALS_min = 15000,
@@ -138,6 +144,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 5000,
 			.tALS_min = 10000,
@@ -178,6 +186,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 5000,
 			.tALS_min = 10000,
@@ -218,6 +228,8 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	{
 		.type = NAND_SDR_IFACE,
 		.timings.sdr = {
+			.tCCS_min = 500000,
+			.tR_max = 200000000,
 			.tADL_min = 400000,
 			.tALH_min = 5000,
 			.tALS_min = 10000,
@@ -290,10 +302,22 @@ int onfi_init_data_interface(struct nand_chip *chip,
 	*iface = onfi_sdr_timings[timing_mode];
 
 	/*
-	 * TODO: initialize timings that cannot be deduced from timing mode:
+	 * Initialize timings that cannot be deduced from timing mode:
 	 * tR, tPROG, tCCS, ...
 	 * These information are part of the ONFI parameter page.
 	 */
+	if (chip->onfi_version) {
+		struct nand_onfi_params *params = &chip->onfi_params;
+		struct nand_sdr_timings *timings = &iface->timings.sdr;
+
+		/* microseconds -> picoseconds */
+		timings->tPROG_max = 1000000UL * le16_to_cpu(params->t_prog);
+		timings->tBERS_max = 1000000UL * le16_to_cpu(params->t_bers);
+		timings->tR_max = 1000000UL * le16_to_cpu(params->t_r);
+
+		/* nanoseconds -> picoseconds */
+		timings->tCCS_min = 1000UL * le16_to_cpu(params->t_ccs);
+	}
 
 	return 0;
 }
diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 1eb934414eb5..c84742671a5f 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -525,24 +525,20 @@ static int nandsim_debugfs_create(struct nandsim *dev)
 {
 	struct nandsim_debug_info *dbg = &dev->dbg;
 	struct dentry *dent;
-	int err;
 
 	if (!IS_ENABLED(CONFIG_DEBUG_FS))
 		return 0;
 
 	dent = debugfs_create_dir("nandsim", NULL);
-	if (IS_ERR_OR_NULL(dent)) {
-		int err = dent ? -ENODEV : PTR_ERR(dent);
-
-		NS_ERR("cannot create \"nandsim\" debugfs directory, err %d\n",
-			err);
-		return err;
+	if (!dent) {
+		NS_ERR("cannot create \"nandsim\" debugfs directory\n");
+		return -ENODEV;
 	}
 	dbg->dfs_root = dent;
 
 	dent = debugfs_create_file("wear_report", S_IRUSR,
 				   dbg->dfs_root, dev, &dfs_fops);
-	if (IS_ERR_OR_NULL(dent))
+	if (!dent)
 		goto out_remove;
 	dbg->dfs_wear_report = dent;
 
@@ -550,8 +546,7 @@ static int nandsim_debugfs_create(struct nandsim *dev)
 
 out_remove:
 	debugfs_remove_recursive(dbg->dfs_root);
-	err = dent ? PTR_ERR(dent) : -ENODEV;
-	return err;
+	return -ENODEV;
 }
 
 /**
@@ -2313,8 +2308,6 @@ static int __init ns_init_module(void)
 	retval = nand_scan_ident(nsmtd, 1, NULL);
 	if (retval) {
 		NS_ERR("cannot scan NAND Simulator device\n");
-		if (retval > 0)
-			retval = -ENXIO;
 		goto error;
 	}
 
@@ -2350,8 +2343,6 @@ static int __init ns_init_module(void)
 	retval = nand_scan_tail(nsmtd);
 	if (retval) {
 		NS_ERR("can't register NAND Simulator\n");
-		if (retval > 0)
-			retval = -ENXIO;
 		goto error;
 	}
 
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5513bfd9cdc9..2a52101120d4 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1895,10 +1895,10 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 	/* scan NAND device connected to chip controller */
 	nand_chip->options |= info->devsize & NAND_BUSWIDTH_16;
-	if (nand_scan_ident(mtd, 1, NULL)) {
+	err = nand_scan_ident(mtd, 1, NULL);
+	if (err) {
 		dev_err(&info->pdev->dev,
 			"scan failed, may be bus-width mismatch\n");
-		err = -ENXIO;
 		goto return_error;
 	}
 
@@ -2154,10 +2154,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 
 scan_tail:
 	/* second phase scan */
-	if (nand_scan_tail(mtd)) {
-		err = -ENXIO;
+	err = nand_scan_tail(mtd);
+	if (err)
 		goto return_error;
-	}
 
 	if (dev->of_node)
 		mtd_device_register(mtd, NULL, 0);
@@ -2197,6 +2196,7 @@ static const struct of_device_id omap_nand_ids[] = {
 	{ .compatible = "ti,omap2-nand", },
 	{},
 };
+MODULE_DEVICE_TABLE(of, omap_nand_ids);
 
 static struct platform_driver omap_nand_driver = {
 	.probe		= omap_nand_probe,
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
index 40a7c4a2cf0d..4a91c5d000be 100644
--- a/drivers/mtd/nand/orion_nand.c
+++ b/drivers/mtd/nand/orion_nand.c
@@ -155,10 +155,9 @@ static int __init orion_nand_probe(struct platform_device *pdev)
 		clk_put(clk);
 	}
 
-	if (nand_scan(mtd, 1)) {
-		ret = -ENXIO;
+	ret = nand_scan(mtd, 1);
+	if (ret)
 		goto no_dev;
-	}
 
 	mtd->name = "orion_nand";
 	ret = mtd_device_register(mtd, board->parts, board->nr_parts);
diff --git a/drivers/mtd/nand/oxnas_nand.c b/drivers/mtd/nand/oxnas_nand.c
new file mode 100644
index 000000000000..3e3bf3b364d2
--- /dev/null
+++ b/drivers/mtd/nand/oxnas_nand.c
@@ -0,0 +1,195 @@
+/*
+ * Oxford Semiconductor OXNAS NAND driver
+
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
+ * Heavily based on plat_nand.c :
+ * Author: Vitaly Wool <vitalywool@gmail.com>
+ * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of.h>
+
+/* Nand commands */
+#define OXNAS_NAND_CMD_ALE		BIT(18)
+#define OXNAS_NAND_CMD_CLE		BIT(19)
+
+#define OXNAS_NAND_MAX_CHIPS	1
+
+struct oxnas_nand_ctrl {
+	struct nand_hw_control base;
+	void __iomem *io_base;
+	struct clk *clk;
+	struct nand_chip *chips[OXNAS_NAND_MAX_CHIPS];
+};
+
+static uint8_t oxnas_nand_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
+
+	return readb(oxnas->io_base);
+}
+
+static void oxnas_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
+
+	ioread8_rep(oxnas->io_base, buf, len);
+}
+
+static void oxnas_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
+
+	iowrite8_rep(oxnas->io_base, buf, len);
+}
+
+/* Single CS command control */
+static void oxnas_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
+				unsigned int ctrl)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
+
+	if (ctrl & NAND_CLE)
+		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_CLE);
+	else if (ctrl & NAND_ALE)
+		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_ALE);
+}
+
+/*
+ * Probe for the NAND device.
+ */
+static int oxnas_nand_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *nand_np;
+	struct oxnas_nand_ctrl *oxnas;
+	struct nand_chip *chip;
+	struct mtd_info *mtd;
+	struct resource *res;
+	int nchips = 0;
+	int count = 0;
+	int err = 0;
+
+	/* Allocate memory for the device structure (and zero it) */
+	oxnas = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
+			     GFP_KERNEL);
+	if (!oxnas)
+		return -ENOMEM;
+
+	nand_hw_control_init(&oxnas->base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	oxnas->io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(oxnas->io_base))
+		return PTR_ERR(oxnas->io_base);
+
+	oxnas->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(oxnas->clk))
+		oxnas->clk = NULL;
+
+	/* Only a single chip node is supported */
+	count = of_get_child_count(np);
+	if (count > 1)
+		return -EINVAL;
+
+	clk_prepare_enable(oxnas->clk);
+	device_reset_optional(&pdev->dev);
+
+	for_each_child_of_node(np, nand_np) {
+		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
+				    GFP_KERNEL);
+		if (!chip)
+			return -ENOMEM;
+
+		chip->controller = &oxnas->base;
+
+		nand_set_flash_node(chip, nand_np);
+		nand_set_controller_data(chip, oxnas);
+
+		mtd = nand_to_mtd(chip);
+		mtd->dev.parent = &pdev->dev;
+		mtd->priv = chip;
+
+		chip->cmd_ctrl = oxnas_nand_cmd_ctrl;
+		chip->read_buf = oxnas_nand_read_buf;
+		chip->read_byte = oxnas_nand_read_byte;
+		chip->write_buf = oxnas_nand_write_buf;
+		chip->chip_delay = 30;
+
+		/* Scan to find existence of the device */
+		err = nand_scan(mtd, 1);
+		if (err)
+			return err;
+
+		err = mtd_device_register(mtd, NULL, 0);
+		if (err) {
+			nand_release(mtd);
+			return err;
+		}
+
+		oxnas->chips[nchips] = chip;
+		++nchips;
+	}
+
+	/* Exit if no chips found */
+	if (!nchips)
+		return -ENODEV;
+
+	platform_set_drvdata(pdev, oxnas);
+
+	return 0;
+}
+
+static int oxnas_nand_remove(struct platform_device *pdev)
+{
+	struct oxnas_nand_ctrl *oxnas = platform_get_drvdata(pdev);
+
+	if (oxnas->chips[0])
+		nand_release(nand_to_mtd(oxnas->chips[0]));
+
+	clk_disable_unprepare(oxnas->clk);
+
+	return 0;
+}
+
+static const struct of_device_id oxnas_nand_match[] = {
+	{ .compatible = "oxsemi,ox820-nand" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, oxnas_nand_match);
+
+static struct platform_driver oxnas_nand_driver = {
+	.probe	= oxnas_nand_probe,
+	.remove	= oxnas_nand_remove,
+	.driver	= {
+		.name		= "oxnas_nand",
+		.of_match_table = oxnas_nand_match,
+	},
+};
+
+module_platform_driver(oxnas_nand_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_DESCRIPTION("Oxnas NAND driver");
+MODULE_ALIAS("platform:oxnas_nand");
diff --git a/drivers/mtd/nand/pasemi_nand.c b/drivers/mtd/nand/pasemi_nand.c
index 5de7591b0510..074b8b01289e 100644
--- a/drivers/mtd/nand/pasemi_nand.c
+++ b/drivers/mtd/nand/pasemi_nand.c
@@ -156,10 +156,9 @@ static int pasemi_nand_probe(struct platform_device *ofdev)
 	chip->bbt_options = NAND_BBT_USE_FLASH;
 
 	/* Scan to find existence of the device */
-	if (nand_scan(pasemi_nand_mtd, 1)) {
-		err = -ENXIO;
+	err = nand_scan(pasemi_nand_mtd, 1);
+	if (err)
 		goto out_lpc;
-	}
 
 	if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
 		dev_err(dev, "Unable to register MTD device\n");
diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c
index 415a53a0deeb..791de3e4bbb6 100644
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -86,10 +86,9 @@ static int plat_nand_probe(struct platform_device *pdev)
 	}
 
 	/* Scan to find existence of the device */
-	if (nand_scan(mtd, pdata->chip.nr_chips)) {
-		err = -ENXIO;
+	err = nand_scan(mtd, pdata->chip.nr_chips);
+	if (err)
 		goto out;
-	}
 
 	part_types = pdata->chip.part_probe_types;
 
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index b121bf4ed73a..649ba8200832 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -1680,8 +1680,9 @@ static int pxa3xx_nand_scan(struct mtd_info *mtd)
 	chip->ecc.strength = pdata->ecc_strength;
 	chip->ecc.size = pdata->ecc_step_size;
 
-	if (nand_scan_ident(mtd, 1, NULL))
-		return -ENODEV;
+	ret = nand_scan_ident(mtd, 1, NULL);
+	if (ret)
+		return ret;
 
 	if (!pdata->keep_config) {
 		ret = pxa3xx_nand_init(host);
@@ -1774,8 +1775,11 @@ static int alloc_nand_resource(struct platform_device *pdev)
 	int ret, irq, cs;
 
 	pdata = dev_get_platdata(&pdev->dev);
-	if (pdata->num_cs <= 0)
+	if (pdata->num_cs <= 0) {
+		dev_err(&pdev->dev, "invalid number of chip selects\n");
 		return -ENODEV;
+	}
+
 	info = devm_kzalloc(&pdev->dev,
 			    sizeof(*info) + sizeof(*host) * pdata->num_cs,
 			    GFP_KERNEL);
@@ -1813,8 +1817,9 @@ static int alloc_nand_resource(struct platform_device *pdev)
 	nand_hw_control_init(chip->controller);
 	info->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(info->clk)) {
-		dev_err(&pdev->dev, "failed to get nand clock\n");
-		return PTR_ERR(info->clk);
+		ret = PTR_ERR(info->clk);
+		dev_err(&pdev->dev, "failed to get nand clock: %d\n", ret);
+		return ret;
 	}
 	ret = clk_prepare_enable(info->clk);
 	if (ret < 0)
@@ -1842,6 +1847,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
 	info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
 	if (IS_ERR(info->mmio_base)) {
 		ret = PTR_ERR(info->mmio_base);
+		dev_err(&pdev->dev, "failed to map register space: %d\n", ret);
 		goto fail_disable_clk;
 	}
 	info->mmio_phys = r->start;
@@ -1861,7 +1867,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
 				   pxa3xx_nand_irq_thread, IRQF_ONESHOT,
 				   pdev->name, info);
 	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to request IRQ\n");
+		dev_err(&pdev->dev, "failed to request IRQ: %d\n", ret);
 		goto fail_free_buf;
 	}
 
@@ -1960,10 +1966,8 @@ static int pxa3xx_nand_probe(struct platform_device *pdev)
 	}
 
 	ret = alloc_nand_resource(pdev);
-	if (ret) {
-		dev_err(&pdev->dev, "alloc nand resource failed\n");
+	if (ret)
 		return ret;
-	}
 
 	info = platform_get_drvdata(pdev);
 	probe_success = 0;
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index d459c19d78de..f0b030d44f71 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -39,6 +39,8 @@
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/cpufreq.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
@@ -185,6 +187,22 @@ struct s3c2410_nand_info {
 #endif
 };
 
+struct s3c24XX_nand_devtype_data {
+	enum s3c_cpu_type type;
+};
+
+static const struct s3c24XX_nand_devtype_data s3c2410_nand_devtype_data = {
+	.type = TYPE_S3C2410,
+};
+
+static const struct s3c24XX_nand_devtype_data s3c2412_nand_devtype_data = {
+	.type = TYPE_S3C2412,
+};
+
+static const struct s3c24XX_nand_devtype_data s3c2440_nand_devtype_data = {
+	.type = TYPE_S3C2440,
+};
+
 /* conversion functions */
 
 static struct s3c2410_nand_mtd *s3c2410_nand_mtd_toours(struct mtd_info *mtd)
@@ -497,7 +515,6 @@ static int s3c2412_nand_devready(struct mtd_info *mtd)
 
 /* ECC handling functions */
 
-#ifdef CONFIG_MTD_NAND_S3C2410_HWECC
 static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
 				     u_char *read_ecc, u_char *calc_ecc)
 {
@@ -649,7 +666,6 @@ static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
 
 	return 0;
 }
-#endif
 
 /* over-ride the standard functions for a little more speed. We can
  * use read/write block to move the data buffers to/from the controller
@@ -796,6 +812,30 @@ static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
 	return -ENODEV;
 }
 
+static int s3c2410_nand_setup_data_interface(struct mtd_info *mtd,
+					const struct nand_data_interface *conf,
+					bool check_only)
+{
+	struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
+	struct s3c2410_platform_nand *pdata = info->platform;
+	const struct nand_sdr_timings *timings;
+	int tacls;
+
+	timings = nand_get_sdr_timings(conf);
+	if (IS_ERR(timings))
+		return -ENOTSUPP;
+
+	tacls = timings->tCLS_min - timings->tWP_min;
+	if (tacls < 0)
+		tacls = 0;
+
+	pdata->tacls  = DIV_ROUND_UP(tacls, 1000);
+	pdata->twrph0 = DIV_ROUND_UP(timings->tWP_min, 1000);
+	pdata->twrph1 = DIV_ROUND_UP(timings->tCLH_min, 1000);
+
+	return s3c2410_nand_setrate(info);
+}
+
 /**
  * s3c2410_nand_init_chip - initialise a single instance of an chip
  * @info: The base NAND controller the chip is on.
@@ -810,9 +850,12 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 				   struct s3c2410_nand_mtd *nmtd,
 				   struct s3c2410_nand_set *set)
 {
+	struct device_node *np = info->device->of_node;
 	struct nand_chip *chip = &nmtd->chip;
 	void __iomem *regs = info->regs;
 
+	nand_set_flash_node(chip, set->of_node);
+
 	chip->write_buf    = s3c2410_nand_write_buf;
 	chip->read_buf     = s3c2410_nand_read_buf;
 	chip->select_chip  = s3c2410_nand_select_chip;
@@ -821,6 +864,13 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 	chip->options	   = set->options;
 	chip->controller   = &info->controller;
 
+	/*
+	 * let's keep behavior unchanged for legacy boards booting via pdata and
+	 * auto-detect timings only when booting with a device tree.
+	 */
+	if (np)
+		chip->setup_data_interface = s3c2410_nand_setup_data_interface;
+
 	switch (info->cpu_type) {
 	case TYPE_S3C2410:
 		chip->IO_ADDR_W = regs + S3C2410_NFDATA;
@@ -858,58 +908,14 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
 	nmtd->info	   = info;
 	nmtd->set	   = set;
 
-#ifdef CONFIG_MTD_NAND_S3C2410_HWECC
-	chip->ecc.calculate = s3c2410_nand_calculate_ecc;
-	chip->ecc.correct   = s3c2410_nand_correct_data;
-	chip->ecc.mode	    = NAND_ECC_HW;
-	chip->ecc.strength  = 1;
+	chip->ecc.mode = info->platform->ecc_mode;
 
-	switch (info->cpu_type) {
-	case TYPE_S3C2410:
-		chip->ecc.hwctl	    = s3c2410_nand_enable_hwecc;
-		chip->ecc.calculate = s3c2410_nand_calculate_ecc;
-		break;
-
-	case TYPE_S3C2412:
-		chip->ecc.hwctl     = s3c2412_nand_enable_hwecc;
-		chip->ecc.calculate = s3c2412_nand_calculate_ecc;
-		break;
-
-	case TYPE_S3C2440:
-		chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;
-		chip->ecc.calculate = s3c2440_nand_calculate_ecc;
-		break;
-	}
-#else
-	chip->ecc.mode	    = NAND_ECC_SOFT;
-	chip->ecc.algo	= NAND_ECC_HAMMING;
-#endif
-
-	if (set->disable_ecc)
-		chip->ecc.mode	= NAND_ECC_NONE;
-
-	switch (chip->ecc.mode) {
-	case NAND_ECC_NONE:
-		dev_info(info->device, "NAND ECC disabled\n");
-		break;
-	case NAND_ECC_SOFT:
-		dev_info(info->device, "NAND soft ECC\n");
-		break;
-	case NAND_ECC_HW:
-		dev_info(info->device, "NAND hardware ECC\n");
-		break;
-	default:
-		dev_info(info->device, "NAND ECC UNKNOWN\n");
-		break;
-	}
-
-	/* If you use u-boot BBT creation code, specifying this flag will
-	 * let the kernel fish out the BBT from the NAND, and also skip the
-	 * full NAND scan that can take 1/2s or so. Little things... */
-	if (set->flash_bbt) {
+	/*
+	 * If you use u-boot BBT creation code, specifying this flag will
+	 * let the kernel fish out the BBT from the NAND.
+	 */
+	if (set->flash_bbt)
 		chip->bbt_options |= NAND_BBT_USE_FLASH;
-		chip->options |= NAND_SKIP_BBTSCAN;
-	}
 }
 
 /**
@@ -923,28 +929,146 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
  *
  * The internal state is currently limited to the ECC state information.
 */
-static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
-				     struct s3c2410_nand_mtd *nmtd)
+static int s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
+				    struct s3c2410_nand_mtd *nmtd)
 {
 	struct nand_chip *chip = &nmtd->chip;
 
-	dev_dbg(info->device, "chip %p => page shift %d\n",
-		chip, chip->page_shift);
+	switch (chip->ecc.mode) {
 
-	if (chip->ecc.mode != NAND_ECC_HW)
-		return;
+	case NAND_ECC_NONE:
+		dev_info(info->device, "ECC disabled\n");
+		break;
+
+	case NAND_ECC_SOFT:
+		/*
+		 * This driver expects Hamming based ECC when ecc_mode is set
+		 * to NAND_ECC_SOFT. Force ecc.algo to NAND_ECC_HAMMING to
+		 * avoid adding an extra ecc_algo field to
+		 * s3c2410_platform_nand.
+		 */
+		chip->ecc.algo = NAND_ECC_HAMMING;
+		dev_info(info->device, "soft ECC\n");
+		break;
+
+	case NAND_ECC_HW:
+		chip->ecc.calculate = s3c2410_nand_calculate_ecc;
+		chip->ecc.correct   = s3c2410_nand_correct_data;
+		chip->ecc.strength  = 1;
+
+		switch (info->cpu_type) {
+		case TYPE_S3C2410:
+			chip->ecc.hwctl	    = s3c2410_nand_enable_hwecc;
+			chip->ecc.calculate = s3c2410_nand_calculate_ecc;
+			break;
+
+		case TYPE_S3C2412:
+			chip->ecc.hwctl     = s3c2412_nand_enable_hwecc;
+			chip->ecc.calculate = s3c2412_nand_calculate_ecc;
+			break;
+
+		case TYPE_S3C2440:
+			chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;
+			chip->ecc.calculate = s3c2440_nand_calculate_ecc;
+			break;
+		}
+
+		dev_dbg(info->device, "chip %p => page shift %d\n",
+			chip, chip->page_shift);
 
 		/* change the behaviour depending on whether we are using
 		 * the large or small page nand device */
+		if (chip->page_shift > 10) {
+			chip->ecc.size	    = 256;
+			chip->ecc.bytes	    = 3;
+		} else {
+			chip->ecc.size	    = 512;
+			chip->ecc.bytes	    = 3;
+			mtd_set_ooblayout(nand_to_mtd(chip),
+					  &s3c2410_ooblayout_ops);
+		}
 
-	if (chip->page_shift > 10) {
-		chip->ecc.size	    = 256;
-		chip->ecc.bytes	    = 3;
-	} else {
-		chip->ecc.size	    = 512;
-		chip->ecc.bytes	    = 3;
-		mtd_set_ooblayout(nand_to_mtd(chip), &s3c2410_ooblayout_ops);
+		dev_info(info->device, "hardware ECC\n");
+		break;
+
+	default:
+		dev_err(info->device, "invalid ECC mode!\n");
+		return -EINVAL;
 	}
+
+	if (chip->bbt_options & NAND_BBT_USE_FLASH)
+		chip->options |= NAND_SKIP_BBTSCAN;
+
+	return 0;
+}
+
+static const struct of_device_id s3c24xx_nand_dt_ids[] = {
+	{
+		.compatible = "samsung,s3c2410-nand",
+		.data = &s3c2410_nand_devtype_data,
+	}, {
+		/* also compatible with s3c6400 */
+		.compatible = "samsung,s3c2412-nand",
+		.data = &s3c2412_nand_devtype_data,
+	}, {
+		.compatible = "samsung,s3c2440-nand",
+		.data = &s3c2440_nand_devtype_data,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, s3c24xx_nand_dt_ids);
+
+static int s3c24xx_nand_probe_dt(struct platform_device *pdev)
+{
+	const struct s3c24XX_nand_devtype_data *devtype_data;
+	struct s3c2410_platform_nand *pdata;
+	struct s3c2410_nand_info *info = platform_get_drvdata(pdev);
+	struct device_node *np = pdev->dev.of_node, *child;
+	struct s3c2410_nand_set *sets;
+
+	devtype_data = of_device_get_match_data(&pdev->dev);
+	if (!devtype_data)
+		return -ENODEV;
+
+	info->cpu_type = devtype_data->type;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdev->dev.platform_data = pdata;
+
+	pdata->nr_sets = of_get_child_count(np);
+	if (!pdata->nr_sets)
+		return 0;
+
+	sets = devm_kzalloc(&pdev->dev, sizeof(*sets) * pdata->nr_sets,
+			    GFP_KERNEL);
+	if (!sets)
+		return -ENOMEM;
+
+	pdata->sets = sets;
+
+	for_each_available_child_of_node(np, child) {
+		sets->name = (char *)child->name;
+		sets->of_node = child;
+		sets->nr_chips = 1;
+
+		of_node_get(child);
+
+		sets++;
+	}
+
+	return 0;
+}
+
+static int s3c24xx_nand_probe_pdata(struct platform_device *pdev)
+{
+	struct s3c2410_nand_info *info = platform_get_drvdata(pdev);
+
+	info->cpu_type = platform_get_device_id(pdev)->driver_data;
+
+	return 0;
 }
 
 /* s3c24xx_nand_probe
@@ -956,8 +1080,7 @@ static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
 */
 static int s3c24xx_nand_probe(struct platform_device *pdev)
 {
-	struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
-	enum s3c_cpu_type cpu_type;
+	struct s3c2410_platform_nand *plat;
 	struct s3c2410_nand_info *info;
 	struct s3c2410_nand_mtd *nmtd;
 	struct s3c2410_nand_set *sets;
@@ -967,8 +1090,6 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 	int nr_sets;
 	int setno;
 
-	cpu_type = platform_get_device_id(pdev)->driver_data;
-
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 	if (info == NULL) {
 		err = -ENOMEM;
@@ -990,6 +1111,16 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 
 	s3c2410_nand_clk_set_state(info, CLOCK_ENABLE);
 
+	if (pdev->dev.of_node)
+		err = s3c24xx_nand_probe_dt(pdev);
+	else
+		err = s3c24xx_nand_probe_pdata(pdev);
+
+	if (err)
+		goto exit_error;
+
+	plat = to_nand_plat(pdev);
+
 	/* allocate and map the resource */
 
 	/* currently we assume we have the one resource */
@@ -998,7 +1129,6 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 
 	info->device	= &pdev->dev;
 	info->platform	= plat;
-	info->cpu_type	= cpu_type;
 
 	info->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(info->regs)) {
@@ -1008,12 +1138,6 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 
 	dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs);
 
-	/* initialise the hardware */
-
-	err = s3c2410_nand_inithw(info);
-	if (err != 0)
-		goto exit_error;
-
 	sets = (plat != NULL) ? plat->sets : NULL;
 	nr_sets = (plat != NULL) ? plat->nr_sets : 1;
 
@@ -1046,7 +1170,9 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 						 NULL);
 
 		if (nmtd->scan_res == 0) {
-			s3c2410_nand_update_chip(info, nmtd);
+			err = s3c2410_nand_update_chip(info, nmtd);
+			if (err < 0)
+				goto exit_error;
 			nand_scan_tail(mtd);
 			s3c2410_nand_add_partition(info, nmtd, sets);
 		}
@@ -1055,6 +1181,11 @@ static int s3c24xx_nand_probe(struct platform_device *pdev)
 			sets++;
 	}
 
+	/* initialise the hardware */
+	err = s3c2410_nand_inithw(info);
+	if (err != 0)
+		goto exit_error;
+
 	err = s3c2410_nand_cpufreq_register(info);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to init cpufreq support\n");
@@ -1155,6 +1286,7 @@ static struct platform_driver s3c24xx_nand_driver = {
 	.id_table	= s3c24xx_driver_ids,
 	.driver		= {
 		.name	= "s3c24xx-nand",
+		.of_match_table = s3c24xx_nand_dt_ids,
 	},
 };
 
diff --git a/drivers/mtd/nand/socrates_nand.c b/drivers/mtd/nand/socrates_nand.c
index 888fd314c62a..72369bd079af 100644
--- a/drivers/mtd/nand/socrates_nand.c
+++ b/drivers/mtd/nand/socrates_nand.c
@@ -187,17 +187,9 @@ static int socrates_nand_probe(struct platform_device *ofdev)
 
 	dev_set_drvdata(&ofdev->dev, host);
 
-	/* first scan to find the device and get the page size */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		res = -ENXIO;
+	res = nand_scan(mtd, 1);
+	if (res)
 		goto out;
-	}
-
-	/* second phase scan */
-	if (nand_scan_tail(mtd)) {
-		res = -ENXIO;
-		goto out;
-	}
 
 	res = mtd_device_register(mtd, NULL, 0);
 	if (!res)
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index 8b8470c4e6d0..e40482a65de6 100644
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -145,6 +145,7 @@
 #define NFC_ECC_PIPELINE	BIT(3)
 #define NFC_ECC_EXCEPTION	BIT(4)
 #define NFC_ECC_BLOCK_SIZE_MSK	BIT(5)
+#define NFC_ECC_BLOCK_512	BIT(5)
 #define NFC_RANDOM_EN		BIT(9)
 #define NFC_RANDOM_DIRECTION	BIT(10)
 #define NFC_ECC_MODE_MSK	GENMASK(15, 12)
@@ -817,6 +818,9 @@ static void sunxi_nfc_hw_ecc_enable(struct mtd_info *mtd)
 	ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(data->mode) | NFC_ECC_EXCEPTION |
 		   NFC_ECC_PIPELINE;
 
+	if (nand->ecc.size == 512)
+		ecc_ctl |= NFC_ECC_BLOCK_512;
+
 	writel(ecc_ctl, nfc->regs + NFC_REG_ECC_CTL);
 }
 
diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c
new file mode 100644
index 000000000000..ec87516b87f5
--- /dev/null
+++ b/drivers/mtd/nand/tango_nand.c
@@ -0,0 +1,668 @@
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+
+/* Offsets relative to chip->base */
+#define PBUS_CMD	0
+#define PBUS_ADDR	4
+#define PBUS_DATA	8
+
+/* Offsets relative to reg_base */
+#define NFC_STATUS	0x00
+#define NFC_FLASH_CMD	0x04
+#define NFC_DEVICE_CFG	0x08
+#define NFC_TIMING1	0x0c
+#define NFC_TIMING2	0x10
+#define NFC_XFER_CFG	0x14
+#define NFC_PKT_0_CFG	0x18
+#define NFC_PKT_N_CFG	0x1c
+#define NFC_BB_CFG	0x20
+#define NFC_ADDR_PAGE	0x24
+#define NFC_ADDR_OFFSET	0x28
+#define NFC_XFER_STATUS	0x2c
+
+/* NFC_STATUS values */
+#define CMD_READY	BIT(31)
+
+/* NFC_FLASH_CMD values */
+#define NFC_READ	1
+#define NFC_WRITE	2
+
+/* NFC_XFER_STATUS values */
+#define PAGE_IS_EMPTY	BIT(16)
+
+/* Offsets relative to mem_base */
+#define METADATA	0x000
+#define ERROR_REPORT	0x1c0
+
+/*
+ * Error reports are split in two bytes:
+ * byte 0 for the first packet in the page (PKT_0)
+ * byte 1 for other packets in the page (PKT_N, for N > 0)
+ * ERR_COUNT_PKT_N is the max error count over all but the first packet.
+ */
+#define DECODE_OK_PKT_0(v)	((v) & BIT(7))
+#define DECODE_OK_PKT_N(v)	((v) & BIT(15))
+#define ERR_COUNT_PKT_0(v)	(((v) >> 0) & 0x3f)
+#define ERR_COUNT_PKT_N(v)	(((v) >> 8) & 0x3f)
+
+/* Offsets relative to pbus_base */
+#define PBUS_CS_CTRL	0x83c
+#define PBUS_PAD_MODE	0x8f0
+
+/* PBUS_CS_CTRL values */
+#define PBUS_IORDY	BIT(31)
+
+/*
+ * PBUS_PAD_MODE values
+ * In raw mode, the driver communicates directly with the NAND chips.
+ * In NFC mode, the NAND Flash controller manages the communication.
+ * We use NFC mode for read and write; raw mode for everything else.
+ */
+#define MODE_RAW	0
+#define MODE_NFC	BIT(31)
+
+#define METADATA_SIZE	4
+#define BBM_SIZE	6
+#define FIELD_ORDER	15
+
+#define MAX_CS		4
+
+struct tango_nfc {
+	struct nand_hw_control hw;
+	void __iomem *reg_base;
+	void __iomem *mem_base;
+	void __iomem *pbus_base;
+	struct tango_chip *chips[MAX_CS];
+	struct dma_chan *chan;
+	int freq_kHz;
+};
+
+#define to_tango_nfc(ptr) container_of(ptr, struct tango_nfc, hw)
+
+struct tango_chip {
+	struct nand_chip nand_chip;
+	void __iomem *base;
+	u32 timing1;
+	u32 timing2;
+	u32 xfer_cfg;
+	u32 pkt_0_cfg;
+	u32 pkt_n_cfg;
+	u32 bb_cfg;
+};
+
+#define to_tango_chip(ptr) container_of(ptr, struct tango_chip, nand_chip)
+
+#define XFER_CFG(cs, page_count, steps, metadata_size)	\
+	((cs) << 24 | (page_count) << 16 | (steps) << 8 | (metadata_size))
+
+#define PKT_CFG(size, strength) ((size) << 16 | (strength))
+
+#define BB_CFG(bb_offset, bb_size) ((bb_offset) << 16 | (bb_size))
+
+#define TIMING(t0, t1, t2, t3) ((t0) << 24 | (t1) << 16 | (t2) << 8 | (t3))
+
+static void tango_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
+{
+	struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
+
+	if (ctrl & NAND_CLE)
+		writeb_relaxed(dat, tchip->base + PBUS_CMD);
+
+	if (ctrl & NAND_ALE)
+		writeb_relaxed(dat, tchip->base + PBUS_ADDR);
+}
+
+static int tango_dev_ready(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct tango_nfc *nfc = to_tango_nfc(chip->controller);
+
+	return readl_relaxed(nfc->pbus_base + PBUS_CS_CTRL) & PBUS_IORDY;
+}
+
+static u8 tango_read_byte(struct mtd_info *mtd)
+{
+	struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
+
+	return readb_relaxed(tchip->base + PBUS_DATA);
+}
+
+static void tango_read_buf(struct mtd_info *mtd, u8 *buf, int len)
+{
+	struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
+
+	ioread8_rep(tchip->base + PBUS_DATA, buf, len);
+}
+
+static void tango_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
+{
+	struct tango_chip *tchip = to_tango_chip(mtd_to_nand(mtd));
+
+	iowrite8_rep(tchip->base + PBUS_DATA, buf, len);
+}
+
+static void tango_select_chip(struct mtd_info *mtd, int idx)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct tango_nfc *nfc = to_tango_nfc(chip->controller);
+	struct tango_chip *tchip = to_tango_chip(chip);
+
+	if (idx < 0)
+		return; /* No "chip unselect" function */
+
+	writel_relaxed(tchip->timing1, nfc->reg_base + NFC_TIMING1);
+	writel_relaxed(tchip->timing2, nfc->reg_base + NFC_TIMING2);
+	writel_relaxed(tchip->xfer_cfg, nfc->reg_base + NFC_XFER_CFG);
+	writel_relaxed(tchip->pkt_0_cfg, nfc->reg_base + NFC_PKT_0_CFG);
+	writel_relaxed(tchip->pkt_n_cfg, nfc->reg_base + NFC_PKT_N_CFG);
+	writel_relaxed(tchip->bb_cfg, nfc->reg_base + NFC_BB_CFG);
+}
+
+/*
+ * The controller does not check for bitflips in erased pages,
+ * therefore software must check instead.
+ */
+static int check_erased_page(struct nand_chip *chip, u8 *buf)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	u8 *meta = chip->oob_poi + BBM_SIZE;
+	u8 *ecc = chip->oob_poi + BBM_SIZE + METADATA_SIZE;
+	const int ecc_size = chip->ecc.bytes;
+	const int pkt_size = chip->ecc.size;
+	int i, res, meta_len, bitflips = 0;
+
+	for (i = 0; i < chip->ecc.steps; ++i) {
+		meta_len = i ? 0 : METADATA_SIZE;
+		res = nand_check_erased_ecc_chunk(buf, pkt_size, ecc, ecc_size,
+						  meta, meta_len,
+						  chip->ecc.strength);
+		if (res < 0)
+			mtd->ecc_stats.failed++;
+
+		bitflips = max(res, bitflips);
+		buf += pkt_size;
+		ecc += ecc_size;
+	}
+
+	return bitflips;
+}
+
+static int decode_error_report(struct tango_nfc *nfc)
+{
+	u32 status, res;
+
+	status = readl_relaxed(nfc->reg_base + NFC_XFER_STATUS);
+	if (status & PAGE_IS_EMPTY)
+		return 0;
+
+	res = readl_relaxed(nfc->mem_base + ERROR_REPORT);
+
+	if (DECODE_OK_PKT_0(res) && DECODE_OK_PKT_N(res))
+		return max(ERR_COUNT_PKT_0(res), ERR_COUNT_PKT_N(res));
+
+	return -EBADMSG;
+}
+
+static void tango_dma_callback(void *arg)
+{
+	complete(arg);
+}
+
+static int do_dma(struct tango_nfc *nfc, int dir, int cmd, const void *buf,
+		  int len, int page)
+{
+	void __iomem *addr = nfc->reg_base + NFC_STATUS;
+	struct dma_chan *chan = nfc->chan;
+	struct dma_async_tx_descriptor *desc;
+	struct scatterlist sg;
+	struct completion tx_done;
+	int err = -EIO;
+	u32 res, val;
+
+	sg_init_one(&sg, buf, len);
+	if (dma_map_sg(chan->device->dev, &sg, 1, dir) != 1)
+		return -EIO;
+
+	desc = dmaengine_prep_slave_sg(chan, &sg, 1, dir, DMA_PREP_INTERRUPT);
+	if (!desc)
+		goto dma_unmap;
+
+	desc->callback = tango_dma_callback;
+	desc->callback_param = &tx_done;
+	init_completion(&tx_done);
+
+	writel_relaxed(MODE_NFC, nfc->pbus_base + PBUS_PAD_MODE);
+
+	writel_relaxed(page, nfc->reg_base + NFC_ADDR_PAGE);
+	writel_relaxed(0, nfc->reg_base + NFC_ADDR_OFFSET);
+	writel_relaxed(cmd, nfc->reg_base + NFC_FLASH_CMD);
+
+	dmaengine_submit(desc);
+	dma_async_issue_pending(chan);
+
+	res = wait_for_completion_timeout(&tx_done, HZ);
+	if (res > 0)
+		err = readl_poll_timeout(addr, val, val & CMD_READY, 0, 1000);
+
+	writel_relaxed(MODE_RAW, nfc->pbus_base + PBUS_PAD_MODE);
+
+dma_unmap:
+	dma_unmap_sg(chan->device->dev, &sg, 1, dir);
+
+	return err;
+}
+
+static int tango_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+			   u8 *buf, int oob_required, int page)
+{
+	struct tango_nfc *nfc = to_tango_nfc(chip->controller);
+	int err, res, len = mtd->writesize;
+
+	if (oob_required)
+		chip->ecc.read_oob(mtd, chip, page);
+
+	err = do_dma(nfc, DMA_FROM_DEVICE, NFC_READ, buf, len, page);
+	if (err)
+		return err;
+
+	res = decode_error_report(nfc);
+	if (res < 0) {
+		chip->ecc.read_oob_raw(mtd, chip, page);
+		res = check_erased_page(chip, buf);
+	}
+
+	return res;
+}
+
+static int tango_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+			    const u8 *buf, int oob_required, int page)
+{
+	struct tango_nfc *nfc = to_tango_nfc(chip->controller);
+	int err, len = mtd->writesize;
+
+	/* Calling tango_write_oob() would send PAGEPROG twice */
+	if (oob_required)
+		return -ENOTSUPP;
+
+	writel_relaxed(0xffffffff, nfc->mem_base + METADATA);
+	err = do_dma(nfc, DMA_TO_DEVICE, NFC_WRITE, buf, len, page);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static void aux_read(struct nand_chip *chip, u8 **buf, int len, int *pos)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	*pos += len;
+
+	if (!*buf) {
+		/* skip over "len" bytes */
+		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, *pos, -1);
+	} else {
+		tango_read_buf(mtd, *buf, len);
+		*buf += len;
+	}
+}
+
+static void aux_write(struct nand_chip *chip, const u8 **buf, int len, int *pos)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	*pos += len;
+
+	if (!*buf) {
+		/* skip over "len" bytes */
+		chip->cmdfunc(mtd, NAND_CMD_SEQIN, *pos, -1);
+	} else {
+		tango_write_buf(mtd, *buf, len);
+		*buf += len;
+	}
+}
+
+/*
+ * Physical page layout (not drawn to scale)
+ *
+ * NB: Bad Block Marker area splits PKT_N in two (N1, N2).
+ *
+ * +---+-----------------+-------+-----+-----------+-----+----+-------+
+ * | M |      PKT_0      | ECC_0 | ... |     N1    | BBM | N2 | ECC_N |
+ * +---+-----------------+-------+-----+-----------+-----+----+-------+
+ *
+ * Logical page layout:
+ *
+ *       +-----+---+-------+-----+-------+
+ * oob = | BBM | M | ECC_0 | ... | ECC_N |
+ *       +-----+---+-------+-----+-------+
+ *
+ *       +-----------------+-----+-----------------+
+ * buf = |      PKT_0      | ... |      PKT_N      |
+ *       +-----------------+-----+-----------------+
+ */
+static void raw_read(struct nand_chip *chip, u8 *buf, u8 *oob)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	u8 *oob_orig = oob;
+	const int page_size = mtd->writesize;
+	const int ecc_size = chip->ecc.bytes;
+	const int pkt_size = chip->ecc.size;
+	int pos = 0; /* position within physical page */
+	int rem = page_size; /* bytes remaining until BBM area */
+
+	if (oob)
+		oob += BBM_SIZE;
+
+	aux_read(chip, &oob, METADATA_SIZE, &pos);
+
+	while (rem > pkt_size) {
+		aux_read(chip, &buf, pkt_size, &pos);
+		aux_read(chip, &oob, ecc_size, &pos);
+		rem = page_size - pos;
+	}
+
+	aux_read(chip, &buf, rem, &pos);
+	aux_read(chip, &oob_orig, BBM_SIZE, &pos);
+	aux_read(chip, &buf, pkt_size - rem, &pos);
+	aux_read(chip, &oob, ecc_size, &pos);
+}
+
+static void raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	const u8 *oob_orig = oob;
+	const int page_size = mtd->writesize;
+	const int ecc_size = chip->ecc.bytes;
+	const int pkt_size = chip->ecc.size;
+	int pos = 0; /* position within physical page */
+	int rem = page_size; /* bytes remaining until BBM area */
+
+	if (oob)
+		oob += BBM_SIZE;
+
+	aux_write(chip, &oob, METADATA_SIZE, &pos);
+
+	while (rem > pkt_size) {
+		aux_write(chip, &buf, pkt_size, &pos);
+		aux_write(chip, &oob, ecc_size, &pos);
+		rem = page_size - pos;
+	}
+
+	aux_write(chip, &buf, rem, &pos);
+	aux_write(chip, &oob_orig, BBM_SIZE, &pos);
+	aux_write(chip, &buf, pkt_size - rem, &pos);
+	aux_write(chip, &oob, ecc_size, &pos);
+}
+
+static int tango_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+			       u8 *buf, int oob_required, int page)
+{
+	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+	raw_read(chip, buf, chip->oob_poi);
+	return 0;
+}
+
+static int tango_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+				const u8 *buf, int oob_required, int page)
+{
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0, page);
+	raw_write(chip, buf, chip->oob_poi);
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+	return 0;
+}
+
+static int tango_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+			  int page)
+{
+	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+	raw_read(chip, NULL, chip->oob_poi);
+	return 0;
+}
+
+static int tango_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+			   int page)
+{
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0, page);
+	raw_write(chip, NULL, chip->oob_poi);
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+	chip->waitfunc(mtd, chip);
+	return 0;
+}
+
+static int oob_ecc(struct mtd_info *mtd, int idx, struct mtd_oob_region *res)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+
+	if (idx >= ecc->steps)
+		return -ERANGE;
+
+	res->offset = BBM_SIZE + METADATA_SIZE + ecc->bytes * idx;
+	res->length = ecc->bytes;
+
+	return 0;
+}
+
+static int oob_free(struct mtd_info *mtd, int idx, struct mtd_oob_region *res)
+{
+	return -ERANGE; /* no free space in spare area */
+}
+
+static const struct mtd_ooblayout_ops tango_nand_ooblayout_ops = {
+	.ecc	= oob_ecc,
+	.free	= oob_free,
+};
+
+static u32 to_ticks(int kHz, int ps)
+{
+	return DIV_ROUND_UP_ULL((u64)kHz * ps, NSEC_PER_SEC);
+}
+
+static int tango_set_timings(struct mtd_info *mtd,
+			     const struct nand_data_interface *conf,
+			     bool check_only)
+{
+	const struct nand_sdr_timings *sdr = nand_get_sdr_timings(conf);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct tango_nfc *nfc = to_tango_nfc(chip->controller);
+	struct tango_chip *tchip = to_tango_chip(chip);
+	u32 Trdy, Textw, Twc, Twpw, Tacc, Thold, Trpw, Textr;
+	int kHz = nfc->freq_kHz;
+
+	if (IS_ERR(sdr))
+		return PTR_ERR(sdr);
+
+	if (check_only)
+		return 0;
+
+	Trdy = to_ticks(kHz, sdr->tCEA_max - sdr->tREA_max);
+	Textw = to_ticks(kHz, sdr->tWB_max);
+	Twc = to_ticks(kHz, sdr->tWC_min);
+	Twpw = to_ticks(kHz, sdr->tWC_min - sdr->tWP_min);
+
+	Tacc = to_ticks(kHz, sdr->tREA_max);
+	Thold = to_ticks(kHz, sdr->tREH_min);
+	Trpw = to_ticks(kHz, sdr->tRC_min - sdr->tREH_min);
+	Textr = to_ticks(kHz, sdr->tRHZ_max);
+
+	tchip->timing1 = TIMING(Trdy, Textw, Twc, Twpw);
+	tchip->timing2 = TIMING(Tacc, Thold, Trpw, Textr);
+
+	return 0;
+}
+
+static int chip_init(struct device *dev, struct device_node *np)
+{
+	u32 cs;
+	int err, res;
+	struct mtd_info *mtd;
+	struct nand_chip *chip;
+	struct tango_chip *tchip;
+	struct nand_ecc_ctrl *ecc;
+	struct tango_nfc *nfc = dev_get_drvdata(dev);
+
+	tchip = devm_kzalloc(dev, sizeof(*tchip), GFP_KERNEL);
+	if (!tchip)
+		return -ENOMEM;
+
+	res = of_property_count_u32_elems(np, "reg");
+	if (res < 0)
+		return res;
+
+	if (res != 1)
+		return -ENOTSUPP; /* Multi-CS chips are not supported */
+
+	err = of_property_read_u32_index(np, "reg", 0, &cs);
+	if (err)
+		return err;
+
+	if (cs >= MAX_CS)
+		return -EINVAL;
+
+	chip = &tchip->nand_chip;
+	ecc = &chip->ecc;
+	mtd = nand_to_mtd(chip);
+
+	chip->read_byte = tango_read_byte;
+	chip->write_buf = tango_write_buf;
+	chip->read_buf = tango_read_buf;
+	chip->select_chip = tango_select_chip;
+	chip->cmd_ctrl = tango_cmd_ctrl;
+	chip->dev_ready = tango_dev_ready;
+	chip->setup_data_interface = tango_set_timings;
+	chip->options = NAND_USE_BOUNCE_BUFFER |
+			NAND_NO_SUBPAGE_WRITE |
+			NAND_WAIT_TCCS;
+	chip->controller = &nfc->hw;
+	tchip->base = nfc->pbus_base + (cs * 256);
+
+	nand_set_flash_node(chip, np);
+	mtd_set_ooblayout(mtd, &tango_nand_ooblayout_ops);
+	mtd->dev.parent = dev;
+
+	err = nand_scan_ident(mtd, 1, NULL);
+	if (err)
+		return err;
+
+	ecc->mode = NAND_ECC_HW;
+	ecc->algo = NAND_ECC_BCH;
+	ecc->bytes = DIV_ROUND_UP(ecc->strength * FIELD_ORDER, BITS_PER_BYTE);
+
+	ecc->read_page_raw = tango_read_page_raw;
+	ecc->write_page_raw = tango_write_page_raw;
+	ecc->read_page = tango_read_page;
+	ecc->write_page = tango_write_page;
+	ecc->read_oob = tango_read_oob;
+	ecc->write_oob = tango_write_oob;
+	ecc->options = NAND_ECC_CUSTOM_PAGE_ACCESS;
+
+	err = nand_scan_tail(mtd);
+	if (err)
+		return err;
+
+	tchip->xfer_cfg = XFER_CFG(cs, 1, ecc->steps, METADATA_SIZE);
+	tchip->pkt_0_cfg = PKT_CFG(ecc->size + METADATA_SIZE, ecc->strength);
+	tchip->pkt_n_cfg = PKT_CFG(ecc->size, ecc->strength);
+	tchip->bb_cfg = BB_CFG(mtd->writesize, BBM_SIZE);
+
+	err = mtd_device_register(mtd, NULL, 0);
+	if (err)
+		return err;
+
+	nfc->chips[cs] = tchip;
+
+	return 0;
+}
+
+static int tango_nand_remove(struct platform_device *pdev)
+{
+	int cs;
+	struct tango_nfc *nfc = platform_get_drvdata(pdev);
+
+	dma_release_channel(nfc->chan);
+
+	for (cs = 0; cs < MAX_CS; ++cs) {
+		if (nfc->chips[cs])
+			nand_release(nand_to_mtd(&nfc->chips[cs]->nand_chip));
+	}
+
+	return 0;
+}
+
+static int tango_nand_probe(struct platform_device *pdev)
+{
+	int err;
+	struct clk *clk;
+	struct resource *res;
+	struct tango_nfc *nfc;
+	struct device_node *np;
+
+	nfc = devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL);
+	if (!nfc)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	nfc->reg_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(nfc->reg_base))
+		return PTR_ERR(nfc->reg_base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	nfc->mem_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(nfc->mem_base))
+		return PTR_ERR(nfc->mem_base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	nfc->pbus_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(nfc->pbus_base))
+		return PTR_ERR(nfc->pbus_base);
+
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	nfc->chan = dma_request_chan(&pdev->dev, "nfc_sbox");
+	if (IS_ERR(nfc->chan))
+		return PTR_ERR(nfc->chan);
+
+	platform_set_drvdata(pdev, nfc);
+	nand_hw_control_init(&nfc->hw);
+	nfc->freq_kHz = clk_get_rate(clk) / 1000;
+
+	for_each_child_of_node(pdev->dev.of_node, np) {
+		err = chip_init(&pdev->dev, np);
+		if (err) {
+			tango_nand_remove(pdev);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static const struct of_device_id tango_nand_ids[] = {
+	{ .compatible = "sigma,smp8758-nand" },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver tango_nand_driver = {
+	.probe	= tango_nand_probe,
+	.remove	= tango_nand_remove,
+	.driver	= {
+		.name		= "tango-nand",
+		.of_match_table	= tango_nand_ids,
+	},
+};
+
+module_platform_driver(tango_nand_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sigma Designs");
+MODULE_DESCRIPTION("Tango4 NAND Flash controller driver");
diff --git a/drivers/mtd/nand/tmio_nand.c b/drivers/mtd/nand/tmio_nand.c
index 08b30549ec0a..fc5e773f8b60 100644
--- a/drivers/mtd/nand/tmio_nand.c
+++ b/drivers/mtd/nand/tmio_nand.c
@@ -435,10 +435,10 @@ static int tmio_probe(struct platform_device *dev)
 	nand_chip->waitfunc = tmio_nand_wait;
 
 	/* Scan to find existence of the device */
-	if (nand_scan(mtd, 1)) {
-		retval = -ENODEV;
+	retval = nand_scan(mtd, 1);
+	if (retval)
 		goto err_irq;
-	}
+
 	/* Register the partitions */
 	retval = mtd_device_parse_register(mtd, NULL, NULL,
 					   data ? data->partition : NULL,
diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 3ad514c44dcb..3ea4bb19e12d 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -717,10 +717,9 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 	vf610_nfc_preinit_controller(nfc);
 
 	/* first scan to find the device and get the page size */
-	if (nand_scan_ident(mtd, 1, NULL)) {
-		err = -ENXIO;
+	err = nand_scan_ident(mtd, 1, NULL);
+	if (err)
 		goto error;
-	}
 
 	vf610_nfc_init_controller(nfc);
 
@@ -775,10 +774,9 @@ static int vf610_nfc_probe(struct platform_device *pdev)
 	}
 
 	/* second phase scan */
-	if (nand_scan_tail(mtd)) {
-		err = -ENXIO;
+	err = nand_scan_tail(mtd);
+	if (err)
 		goto error;
-	}
 
 	platform_set_drvdata(pdev, mtd);