mtd: rawnand: brcmnand: Move OF operations out of brcmnand_init_cs()

In order to initialize a given chip select object for use by the
brcmnand driver, move all of the Device Tree specific routines outside
of brcmnand_init_cs() in order to make it usable in a platform data
configuration which will be necessary for supporting BCMA chips.

No functional changes introduced.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220107184614.2670254-5-f.fainelli@gmail.com

drivers/mtd/nand/raw/brcmnand/brcmnand.c

@@ -2768,7 +2768,7 @@ static const struct nand_controller_ops brcmnand_controller_ops = {
 	.attach_chip = brcmnand_attach_chip,
 };
 
-static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
+static int brcmnand_init_cs(struct brcmnand_host *host)
 {
 	struct brcmnand_controller *ctrl = host->ctrl;
 	struct device *dev = ctrl->dev;
@@ -2777,16 +2777,9 @@ static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
 	int ret;
 	u16 cfg_offs;
 
-	ret = of_property_read_u32(dn, "reg", &host->cs);
-	if (ret) {
-		dev_err(dev, "can't get chip-select\n");
-		return -ENXIO;
-	}
-
 	mtd = nand_to_mtd(&host->chip);
 	chip = &host->chip;
 
-	nand_set_flash_node(chip, dn);
 	nand_set_controller_data(chip, host);
 	mtd->name = devm_kasprintf(dev, GFP_KERNEL, "brcmnand.%d",
 				   host->cs);
@@ -3193,7 +3186,16 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
 			host->pdev = pdev;
 			host->ctrl = ctrl;
 
-			ret = brcmnand_init_cs(host, child);
+			ret = of_property_read_u32(child, "reg", &host->cs);
+			if (ret) {
+				dev_err(dev, "can't get chip-select\n");
+				devm_kfree(dev, host);
+				continue;
+			}
+
+			nand_set_flash_node(&host->chip, child);
+
+			ret = brcmnand_init_cs(host);
 			if (ret) {
 				devm_kfree(dev, host);
 				continue; /* Try all chip-selects */