DeviceTree fixes for 4.8:

- Couple of DT node ref counting fixes
 
 - Fix __unflatten_device_tree for PPC PCI hotplug case
 
 - Rework marking irq controllers as OF_POPULATED in cases where real
 driver is used.
 
 - Disable of_platform_default_populate_init on PPC. The change in
 initcall order causes problems which need to be sorted out later.
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Merge tag 'devicetree-fixes-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull DeviceTree fixes from Rob Herring:

 - a couple of DT node ref counting fixes

 - fix __unflatten_device_tree for PPC PCI hotplug case

 - rework marking irq controllers as OF_POPULATED in cases where real
   driver is used.

 - disable of_platform_default_populate_init on PPC.  The change in
   initcall order causes problems which need to be sorted out later.

* tag 'devicetree-fixes-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: fix reference counting in of_graph_get_endpoint_by_regs
  of/platform: disable the of_platform_default_populate_init() for all the ppc boards
  ARM: imx6: mark GPC node as not populated after irq init to probe pm domain driver
  of/irq: Mark interrupt controllers as populated before initialisation
  drivers/of: Validate device node in __unflatten_device_tree()
  of: Delete an unnecessary check before the function call "of_node_put"

arch/arm/mach-imx/gpc.c

@@ -271,6 +271,12 @@ static int __init imx_gpc_init(struct device_node *node,
 	for (i = 0; i < IMR_NUM; i++)
 		writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
 
+	/*
+	 * Clear the OF_POPULATED flag set in of_irq_init so that
+	 * later the GPC power domain driver will not be skipped.
+	 */
+	of_node_clear_flag(node, OF_POPULATED);
+
 	return 0;
 }
 IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);

drivers/of/base.c

@@ -1631,8 +1631,7 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
 	 */
 
  err:
-	if (it.node)
-		of_node_put(it.node);
+	of_node_put(it.node);
 	return rc;
 }
 
@@ -2343,20 +2342,13 @@ struct device_node *of_graph_get_endpoint_by_regs(
 	const struct device_node *parent, int port_reg, int reg)
 {
 	struct of_endpoint endpoint;
-	struct device_node *node, *prev_node = NULL;
-
-	while (1) {
-		node = of_graph_get_next_endpoint(parent, prev_node);
-		of_node_put(prev_node);
-		if (!node)
-			break;
+	struct device_node *node = NULL;
 
+	for_each_endpoint_of_node(parent, node) {
 		of_graph_parse_endpoint(node, &endpoint);
 		if (((port_reg == -1) || (endpoint.port == port_reg)) &&
 			((reg == -1) || (endpoint.id == reg)))
 			return node;
-
-		prev_node = node;
 	}
 
 	return NULL;

drivers/of/fdt.c

@@ -517,7 +517,7 @@ static void *__unflatten_device_tree(const void *blob,
 		pr_warning("End of tree marker overwritten: %08x\n",
 			   be32_to_cpup(mem + size));
 
-	if (detached) {
+	if (detached && mynodes) {
 		of_node_set_flag(*mynodes, OF_DETACHED);
 		pr_debug("unflattened tree is detached\n");
 	}

drivers/of/irq.c

@@ -544,12 +544,15 @@ void __init of_irq_init(const struct of_device_id *matches)
 
 			list_del(&desc->list);
 
+			of_node_set_flag(desc->dev, OF_POPULATED);
+
 			pr_debug("of_irq_init: init %s (%p), parent %p\n",
 				 desc->dev->full_name,
 				 desc->dev, desc->interrupt_parent);
 			ret = desc->irq_init_cb(desc->dev,
 						desc->interrupt_parent);
 			if (ret) {
+				of_node_clear_flag(desc->dev, OF_POPULATED);
 				kfree(desc);
 				continue;
 			}
@@ -559,8 +562,6 @@ void __init of_irq_init(const struct of_device_id *matches)
 			 * its children can get processed in a subsequent pass.
 			 */
 			list_add_tail(&desc->list, &intc_parent_list);
-
-			of_node_set_flag(desc->dev, OF_POPULATED);
 		}
 
 		/* Get the next pending parent that might have children */

drivers/of/platform.c

@@ -497,6 +497,7 @@ int of_platform_default_populate(struct device_node *root,
 }
 EXPORT_SYMBOL_GPL(of_platform_default_populate);
 
+#ifndef CONFIG_PPC
 static int __init of_platform_default_populate_init(void)
 {
 	struct device_node *node;
@@ -521,6 +522,7 @@ static int __init of_platform_default_populate_init(void)
 	return 0;
 }
 arch_initcall_sync(of_platform_default_populate_init);
+#endif
 
 static int of_platform_device_destroy(struct device *dev, void *data)
 {