--- zzzz-none-000/linux-3.10.107/drivers/mtd/devices/mtd_dataflash.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/mtd/devices/mtd_dataflash.c	2021-02-04 17:41:59.000000000 +0000
@@ -10,7 +10,6 @@
  * 2 of the License, or (at your option) any later version.
 */
 #include <linux/module.h>
-#include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -88,8 +87,6 @@
 	uint8_t			command[4];
 	char			name[24];
 
-	unsigned		partitioned:1;
-
 	unsigned short		page_offset;	/* offset in flash address */
 	unsigned int		page_size;	/* of bytes per page */
 
@@ -105,6 +102,7 @@
 	{ .compatible = "atmel,dataflash", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, dataflash_dt_ids);
 #endif
 
 /* ......................................................................... */
@@ -152,7 +150,7 @@
 {
 	struct dataflash	*priv = mtd->priv;
 	struct spi_device	*spi = priv->spi;
-	struct spi_transfer	x = { .tx_dma = 0, };
+	struct spi_transfer	x = { };
 	struct spi_message	msg;
 	unsigned		blocksize = priv->page_size << 3;
 	uint8_t			*command;
@@ -238,7 +236,7 @@
 			       size_t *retlen, u_char *buf)
 {
 	struct dataflash	*priv = mtd->priv;
-	struct spi_transfer	x[2] = { { .tx_dma = 0, }, };
+	struct spi_transfer	x[2] = { };
 	struct spi_message	msg;
 	unsigned int		addr;
 	uint8_t			*command;
@@ -304,7 +302,7 @@
 {
 	struct dataflash	*priv = mtd->priv;
 	struct spi_device	*spi = priv->spi;
-	struct spi_transfer	x[2] = { { .tx_dma = 0, }, };
+	struct spi_transfer	x[2] = { };
 	struct spi_message	msg;
 	unsigned int		pageaddr, addr, offset, writelen;
 	size_t			remaining = len;
@@ -442,8 +440,8 @@
 
 #ifdef CONFIG_MTD_DATAFLASH_OTP
 
-static int dataflash_get_otp_info(struct mtd_info *mtd,
-		struct otp_info *info, size_t len)
+static int dataflash_get_otp_info(struct mtd_info *mtd, size_t len,
+				  size_t *retlen, struct otp_info *info)
 {
 	/* Report both blocks as identical:  bytes 0..64, locked.
 	 * Unless the user block changed from all-ones, we can't
@@ -452,7 +450,8 @@
 	info->start = 0;
 	info->length = 64;
 	info->locked = 1;
-	return sizeof(*info);
+	*retlen = sizeof(*info);
+	return 0;
 }
 
 static ssize_t otp_read(struct spi_device *spi, unsigned base,
@@ -544,14 +543,18 @@
 	struct dataflash	*priv = mtd->priv;
 	int			status;
 
-	if (len > 64)
-		return -EINVAL;
+	if (from >= 64) {
+		/*
+		 * Attempting to write beyond the end of OTP memory,
+		 * no data can be written.
+		 */
+		*retlen = 0;
+		return 0;
+	}
 
-	/* Strictly speaking, we *could* truncate the write ... but
-	 * let's not do that for the only write that's ever possible.
-	 */
+	/* Truncate the write to fit into OTP memory. */
 	if ((from + len) > 64)
-		return -EINVAL;
+		len = 64 - from;
 
 	/* OUT: OP_WRITE_SECURITY, 3 zeroes, 64 data-or-zero bytes
 	 * IN:  ignore all
@@ -622,7 +625,7 @@
 	struct dataflash		*priv;
 	struct mtd_info			*device;
 	struct mtd_part_parser_data	ppdata;
-	struct flash_platform_data	*pdata = spi->dev.platform_data;
+	struct flash_platform_data	*pdata = dev_get_platdata(&spi->dev);
 	char				*otp_tag = "";
 	int				err = 0;
 
@@ -645,7 +648,6 @@
 	device->size = nr_pages * pagesize;
 	device->erasesize = pagesize;
 	device->writesize = pagesize;
-	device->owner = THIS_MODULE;
 	device->type = MTD_DATAFLASH;
 	device->flags = MTD_WRITEABLE;
 	device->_erase = dataflash_erase;
@@ -661,7 +663,7 @@
 	dev_info(&spi->dev, "%s (%lld KBytes) pagesize %d bytes%s\n",
 			name, (long long)((device->size + 1023) >> 10),
 			pagesize, otp_tag);
-	dev_set_drvdata(&spi->dev, priv);
+	spi_set_drvdata(spi, priv);
 
 	ppdata.of_node = spi->dev.of_node;
 	err = mtd_device_parse_register(device, NULL, &ppdata,
@@ -671,7 +673,6 @@
 	if (!err)
 		return 0;
 
-	dev_set_drvdata(&spi->dev, NULL);
 	kfree(priv);
 	return err;
 }
@@ -881,7 +882,7 @@
 		break;
 	/* obsolete AT45DB1282 not (yet?) supported */
 	default:
-		pr_debug("%s: unsupported device (%x)\n", dev_name(&spi->dev),
+		dev_info(&spi->dev, "unsupported device (%x)\n",
 				status & 0x3c);
 		status = -ENODEV;
 	}
@@ -895,23 +896,20 @@
 
 static int dataflash_remove(struct spi_device *spi)
 {
-	struct dataflash	*flash = dev_get_drvdata(&spi->dev);
+	struct dataflash	*flash = spi_get_drvdata(spi);
 	int			status;
 
 	pr_debug("%s: remove\n", dev_name(&spi->dev));
 
 	status = mtd_device_unregister(&flash->mtd);
-	if (status == 0) {
-		dev_set_drvdata(&spi->dev, NULL);
+	if (status == 0)
 		kfree(flash);
-	}
 	return status;
 }
 
 static struct spi_driver dataflash_driver = {
 	.driver = {
 		.name		= "mtd_dataflash",
-		.owner		= THIS_MODULE,
 		.of_match_table = of_match_ptr(dataflash_dt_ids),
 	},