of/flattree: merge of_get_flat_dt_root

Merge common code between PowerPC and MicroBlaze
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Tested-by: NMichal Simek <monstr@monstr.eu>

arch/microblaze/kernel/prom.c

@@ -50,18 +50,6 @@ typedef u32 cell_t;
 /* export that to outside world */
 struct device_node *of_chosen;
 
-unsigned long __init of_get_flat_dt_root(void)
-{
-	unsigned long p = ((unsigned long)initial_boot_params) +
-		initial_boot_params->off_dt_struct;
-
-	while (*((u32 *)p) == OF_DT_NOP)
-		p += 4;
-	BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
-	p += 4;
-	return _ALIGN(p + strlen((char *)p) + 1, 4);
-}
-
 /**
  * This function can be used within scan_flattened_dt callback to get
  * access to properties

arch/powerpc/kernel/prom.c

@@ -80,18 +80,6 @@ extern rwlock_t devtree_lock;	/* temporary while merging */
 /* export that to outside world */
 struct device_node *of_chosen;
 
-unsigned long __init of_get_flat_dt_root(void)
-{
-	unsigned long p = ((unsigned long)initial_boot_params) +
-		initial_boot_params->off_dt_struct;
-
-	while(*((u32 *)p) == OF_DT_NOP)
-		p += 4;
-	BUG_ON (*((u32 *)p) != OF_DT_BEGIN_NODE);
-	p += 4;
-	return _ALIGN(p + strlen((char *)p) + 1, 4);
-}
-
 /**
  * This  function can be used within scan_flattened_dt callback to get
  * access to properties

drivers/of/fdt.c

@@ -83,3 +83,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 
 	return rc;
 }
+
+/**
+ * of_get_flat_dt_root - find the root node in the flat blob
+ */
+unsigned long __init of_get_flat_dt_root(void)
+{
+	unsigned long p = ((unsigned long)initial_boot_params) +
+		initial_boot_params->off_dt_struct;
+
+	while (*((u32 *)p) == OF_DT_NOP)
+		p += 4;
+	BUG_ON(*((u32 *)p) != OF_DT_BEGIN_NODE);
+	p += 4;
+	return _ALIGN(p + strlen((char *)p) + 1, 4);
+}
+