mtd: spi-nor: Introduce spi_nor_set_addr_width()

Parsing of flash parameters were interleaved with setting of the
nor addr width. Dedicate a function for setting nor addr width.
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: NBoris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: NVignesh Raghavendra <vigneshr@ti.com>

drivers/mtd/spi-nor/spi-nor.c

@@ -4740,6 +4740,33 @@ static const struct flash_info *spi_nor_match_id(const char *name)
 	return NULL;
 }
 
+static int spi_nor_set_addr_width(struct spi_nor *nor)
+{
+	if (nor->addr_width) {
+		/* already configured from SFDP */
+	} else if (nor->info->addr_width) {
+		nor->addr_width = nor->info->addr_width;
+	} else if (nor->mtd.size > 0x1000000) {
+		/* enable 4-byte addressing if the device exceeds 16MiB */
+		nor->addr_width = 4;
+	} else {
+		nor->addr_width = 3;
+	}
+
+	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
+		dev_err(nor->dev, "address width is too large: %u\n",
+			nor->addr_width);
+		return -EINVAL;
+	}
+
+	/* Set 4byte opcodes when possible. */
+	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
+	    !(nor->flags & SNOR_F_HAS_4BAIT))
+		spi_nor_set_4byte_opcodes(nor);
+
+	return 0;
+}
+
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps)
 {
@@ -4886,29 +4913,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (ret)
 		return ret;
 
-	if (nor->addr_width) {
-		/* already configured from SFDP */
-	} else if (info->addr_width) {
-		nor->addr_width = info->addr_width;
-	} else if (mtd->size > 0x1000000) {
-		/* enable 4-byte addressing if the device exceeds 16MiB */
-		nor->addr_width = 4;
-	} else {
-		nor->addr_width = 3;
-	}
-
 	if (info->flags & SPI_NOR_4B_OPCODES)
 		nor->flags |= SNOR_F_4B_OPCODES;
 
-	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
-	    !(nor->flags & SNOR_F_HAS_4BAIT))
-		spi_nor_set_4byte_opcodes(nor);
-
-	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
-		dev_err(dev, "address width is too large: %u\n",
-			nor->addr_width);
-		return -EINVAL;
-	}
+	ret = spi_nor_set_addr_width(nor);
+	if (ret)
+		return ret;
 
 	/* Send all the required SPI flash commands to initialize device */
 	ret = spi_nor_init(nor);