mtd: spinand: add spinand_read_cfg() helper

Put REG_CFG reading code in spinand_read_cfg().
This function will be needed by the future SPI-NAND resume ops.

Signed-off-by: Patrice Chotard <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/nand/spi/core.c

···
 	return 0;
 }
 
-static int spinand_init_cfg_cache(struct spinand_device *spinand)
+static int spinand_read_cfg(struct spinand_device *spinand)
 {
 	struct nand_device *nand = spinand_to_nand(spinand);
-	struct device *dev = &spinand->spimem->spi->dev;
 	unsigned int target;
 	int ret;
-
-	spinand->cfg_cache = devm_kcalloc(dev,
-					  nand->memorg.ntargets,
-					  sizeof(*spinand->cfg_cache),
-					  GFP_KERNEL);
-	if (!spinand->cfg_cache)
-		return -ENOMEM;
 
 	for (target = 0; target < nand->memorg.ntargets; target++) {
 		ret = spinand_select_target(spinand, target);
···
 		if (ret)
 			return ret;
 	}
+
+	return 0;
+}
+
+static int spinand_init_cfg_cache(struct spinand_device *spinand)
+{
+	struct nand_device *nand = spinand_to_nand(spinand);
+	struct device *dev = &spinand->spimem->spi->dev;
+
+	spinand->cfg_cache = devm_kcalloc(dev,
+					  nand->memorg.ntargets,
+					  sizeof(*spinand->cfg_cache),
+					  GFP_KERNEL);
+	if (!spinand->cfg_cache)
+		return -ENOMEM;
 
 	return 0;
 }
···
 	spinand->oobbuf = spinand->databuf + nanddev_page_size(nand);
 
 	ret = spinand_init_cfg_cache(spinand);
+	if (ret)
+		goto err_free_bufs;
+
+	ret = spinand_read_cfg(spinand);
 	if (ret)
 		goto err_free_bufs;