dt: Refactor of_platform_bus_probe()

The current implementation uses three copies of of basically identical
code.  This patch consolidates them to make the code simpler.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 18 insertions, 37 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 1ce4c45c4ab2..f489e36af892 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -210,13 +210,16 @@ struct platform_device *of_platform_device_create(struct device_node *np,
 EXPORT_SYMBOL(of_platform_device_create);
 
 /**
- * of_platform_bus_create - Create an OF device for a bus node and all its
- * children. Optionally recursively instantiate matching busses.
+ * of_platform_bus_create() - Create a device for a node and its children.
  * @bus: device node of the bus to instantiate
  * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
- * disallow recursive creation of child busses
+ * disallow recursive creation of child buses
+ * @parent: parent for new device, or NULL for top level.
+ *
+ * Creates a platform_device for the provided device_node, and optionally
+ * recursively create devices for all the child nodes.
  */
-static int of_platform_bus_create(const struct device_node *bus,
+static int of_platform_bus_create(struct device_node *bus,
                                   const struct of_device_id *matches,
                                   struct device *parent)
 {
@@ -224,18 +227,13 @@ static int of_platform_bus_create(const struct device_node *bus,
         struct platform_device *dev;
         int rc = 0;
 
+        dev = of_platform_device_create(bus, NULL, parent);
+        if (!dev || !of_match_node(matches, bus))
+                return 0;
+
         for_each_child_of_node(bus, child) {
                 pr_debug("   create child: %s\n", child->full_name);
-                dev = of_platform_device_create(child, NULL, parent);
-                if (dev == NULL)
-                        continue;
-
-                if (!of_match_node(matches, child))
-                        continue;
-                if (rc == 0) {
-                        pr_debug("   and sub busses\n");
-                        rc = of_platform_bus_create(child, matches, &dev->dev);
-                }
+                rc = of_platform_bus_create(child, matches, &dev->dev);
                 if (rc) {
                         of_node_put(child);
                         break;
@@ -245,7 +243,7 @@ static int of_platform_bus_create(const struct device_node *bus,
 }
 
 /**
- * of_platform_bus_probe - Probe the device-tree for platform busses
+ * of_platform_bus_probe() - Probe the device-tree for platform buses
  * @root: parent of the first level to probe or NULL for the root of the tree
  * @matches: match table, NULL to use the default
  * @parent: parent to hook devices from, NULL for toplevel
@@ -258,7 +256,6 @@ int of_platform_bus_probe(struct device_node *root,
                           struct device *parent)
 {
         struct device_node *child;
-        struct platform_device *dev;
         int rc = 0;
 
         if (WARN_ON(!matches || matches == OF_NO_DEEP_PROBE))
@@ -277,31 +274,15 @@ int of_platform_bus_probe(struct device_node *root,
          * children
          */
         if (of_match_node(matches, root)) {
-                pr_debug(" root match, create all sub devices\n");
-                dev = of_platform_device_create(root, NULL, parent);
-                if (dev == NULL)
-                        goto bail;
-
-                pr_debug(" create all sub busses\n");
-                rc = of_platform_bus_create(root, matches, &dev->dev);
-                goto bail;
-        }
-        for_each_child_of_node(root, child) {
+                rc = of_platform_bus_create(root, matches, parent);
+        } else for_each_child_of_node(root, child) {
                 if (!of_match_node(matches, child))
                         continue;
-
-                pr_debug("  match: %s\n", child->full_name);
-                dev = of_platform_device_create(child, NULL, parent);
-                if (dev == NULL)
-                        continue;
-
-                rc = of_platform_bus_create(child, matches, &dev->dev);
-                if (rc) {
-                        of_node_put(child);
+                rc = of_platform_bus_create(child, matches, parent);
+                if (rc)
                         break;
-                }
         }
- bail:
+
         of_node_put(root);
         return rc;
 }