wifi: mt76: split get_of_eeprom in subfunction

In preparation for NVMEM support, split get_of_eeprom() in subfunction
to tidy the code and facilitate the addition of alternative method to
get eeprom data. No behaviour change intended.

While at it also drop OF ifdef checks as OF have stubs and calling
of_get_property would result in the same error returned.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/eeprom.c

@@ -9,31 +9,35 @@
 #include <linux/etherdevice.h>
 #include "mt76.h"
 
-int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
+static int mt76_get_of_eeprom_data(struct mt76_dev *dev, void *eep, int len)
 {
-#if defined(CONFIG_OF) && defined(CONFIG_MTD)
 	struct device_node *np = dev->dev->of_node;
-	struct mtd_info *mtd;
-	const __be32 *list;
 	const void *data;
-	const char *part;
-	phandle phandle;
 	int size;
-	size_t retlen;
-	int ret;
 
-	if (!np)
+	data = of_get_property(np, "mediatek,eeprom-data", &size);
+	if (!data)
 		return -ENOENT;
 
-	data = of_get_property(np, "mediatek,eeprom-data", &size);
-	if (data) {
-		if (size > len)
-			return -EINVAL;
+	if (size > len)
+		return -EINVAL;
 
-		memcpy(eep, data, size);
+	memcpy(eep, data, size);
 
-		return 0;
-	}
+	return 0;
+}
+
+static int mt76_get_of_epprom_from_mtd(struct mt76_dev *dev, void *eep, int offset, int len)
+{
+#ifdef CONFIG_MTD
+	struct device_node *np = dev->dev->of_node;
+	struct mtd_info *mtd;
+	const __be32 *list;
+	const char *part;
+	phandle phandle;
+	size_t retlen;
+	int size;
+	int ret;
 
 	list = of_get_property(np, "mediatek,mtd-eeprom", &size);
 	if (!list)
@@ -100,6 +104,21 @@ int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
 	return -ENOENT;
 #endif
 }
+
+int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
+{
+	struct device_node *np = dev->dev->of_node;
+	int ret;
+
+	if (!np)
+		return -ENOENT;
+
+	ret = mt76_get_of_eeprom_data(dev, eep, len);
+	if (!ret)
+		return 0;
+
+	return mt76_get_of_epprom_from_mtd(dev, eep, offset, len);
+}
 EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
 
 void