dm: core: gracefully handle alias seq without of

Gracefully handle alias seq in the platform data rather than OF case.
Signed-off-by: NMarcel Ziswiler <marcel@ziswiler.com>

drivers/core/read.c

@@ -275,15 +275,17 @@ int dev_read_alias_seq(const struct udevice *dev, int *devnump)
 {
 	ofnode node = dev_ofnode(dev);
 	const char *uc_name = dev->uclass->uc_drv->name;
-	int ret;
+	int ret = -ENOTSUPP;
 
 	if (ofnode_is_np(node)) {
 		ret = of_alias_get_id(ofnode_to_np(node), uc_name);
 		if (ret >= 0)
 			*devnump = ret;
 	} else {
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 		ret = fdtdec_get_alias_seq(gd->fdt_blob, uc_name,
 					   ofnode_to_offset(node), devnump);
+#endif
 	}
 
 	return ret;

include/dm/read.h

@@ -923,8 +923,12 @@ static inline const void *dev_read_prop_by_prop(struct ofprop *prop,
 
 static inline int dev_read_alias_seq(const struct udevice *dev, int *devnump)
 {
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 	return fdtdec_get_alias_seq(gd->fdt_blob, dev->uclass->uc_drv->name,
 				    dev_of_offset(dev), devnump);
+#else
+	return -ENOTSUPP;
+#endif
 }
 
 static inline int dev_read_u32_array(const struct udevice *dev,