dm: core: Access device ofnode through functions

At present ofnode is present in the device even if it is never used. With
of-platdata this field is not used, so can be removed. In preparation for
this, change the access to go through inline functions.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/dm/device.h

@@ -200,7 +200,11 @@ static inline void dev_bic_flags(struct udevice *dev, u32 bic)
  */
 static inline ofnode dev_ofnode(const struct udevice *dev)
 {
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
 	return dev->node;
+#else
+	return ofnode_null();
+#endif
 }
 
 /* Returns non-zero if the device is active (probed and not removed) */
@@ -208,12 +212,27 @@ static inline ofnode dev_ofnode(const struct udevice *dev)
 
 static inline int dev_of_offset(const struct udevice *dev)
 {
-	return ofnode_to_offset(dev->node);
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+	return ofnode_to_offset(dev_ofnode(dev));
+#else
+	return -1;
+#endif
 }
 
 static inline bool dev_has_ofnode(const struct udevice *dev)
 {
-	return ofnode_valid(dev->node);
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+	return ofnode_valid(dev_ofnode(dev));
+#else
+	return false;
+#endif
+}
+
+static inline void dev_set_ofnode(struct udevice *dev, ofnode node)
+{
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+	dev->node = node;
+#endif
 }
 
 static inline int dev_seq(const struct udevice *dev)

include/dm/read.h

@@ -21,7 +21,7 @@ struct resource;
 #if CONFIG_IS_ENABLED(OF_LIVE)
 static inline const struct device_node *dev_np(const struct udevice *dev)
 {
-	return ofnode_to_np(dev->node);
+	return ofnode_to_np(dev_ofnode(dev));
 }
 #else
 static inline const struct device_node *dev_np(const struct udevice *dev)

include/linux/mtd/mtd.h

@@ -334,12 +334,12 @@ struct mtd_info {
 #if IS_ENABLED(CONFIG_DM)
 static inline void mtd_set_ofnode(struct mtd_info *mtd, ofnode node)
 {
-	mtd->dev->node = node;
+	dev_set_ofnode(mtd->dev, node);
 }
 
 static inline const ofnode mtd_get_ofnode(struct mtd_info *mtd)
 {
-	return mtd->dev->node;
+	return dev_ofnode(mtd->dev);
 }
 #else
 struct device_node;