Merge tag 'overlay_apply_fdt_v7-for-4.17' of...

Merge tag 'overlay_apply_fdt_v7-for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/frowand/linux into drm/next/du

- DT overlay applying rework (Frank Rowand)

Move duplicating and unflattening of an overlay flattened devicetree
(FDT) into the overlay application code.  To accomplish this,
of_overlay_apply() is replaced by of_overlay_fdt_apply().

Documentation/devicetree/overlay-notes.txt

@@ -87,8 +87,8 @@ Overlay in-kernel API
 
 The API is quite easy to use.
 
-1. Call of_overlay_apply() to create and apply an overlay changeset. The return
-value is an error or a cookie identifying this overlay.
+1. Call of_overlay_fdt_apply() to create and apply an overlay changeset. The
+return value is an error or a cookie identifying this overlay.
 
 2. Call of_overlay_remove() to remove and cleanup the overlay changeset
 previously created via the call to of_overlay_apply(). Removal of an overlay

arch/x86/kernel/devicetree.c

@@ -259,7 +259,7 @@ static void __init dtb_apic_setup(void)
 	dtb_ioapic_setup();
 }
 
-#ifdef CONFIG_OF_FLATTREE
+#ifdef CONFIG_OF_EARLY_FLATTREE
 static void __init x86_flattree_get_config(void)
 {
 	u32 size, map_len;

drivers/of/Kconfig

@@ -92,6 +92,7 @@ config OF_RESOLVE
 config OF_OVERLAY
 	bool "Device Tree overlays"
 	select OF_DYNAMIC
+	select OF_FLATTREE
 	select OF_RESOLVE
 	help
 	  Overlays are a method to dynamically modify part of the kernel's

drivers/of/overlay.c

@@ -12,10 +12,12 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_fdt.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/libfdt.h>
 #include <linux/err.h>
 #include <linux/idr.h>
 
@@ -33,7 +35,9 @@ struct fragment {
 
 /**
  * struct overlay_changeset
+ * @id:			changeset identifier
  * @ovcs_list:		list on which we are located
+ * @fdt:		FDT that was unflattened to create @overlay_tree
  * @overlay_tree:	expanded device tree that contains the fragment nodes
  * @count:		count of fragment structures
  * @fragments:		fragment nodes in the overlay expanded device tree
@@ -43,6 +47,7 @@ struct fragment {
 struct overlay_changeset {
 	int id;
 	struct list_head ovcs_list;
+	const void *fdt;
 	struct device_node *overlay_tree;
 	int count;
 	struct fragment *fragments;
@@ -483,27 +488,38 @@ static int build_changeset(struct overlay_changeset *ovcs)
  */
 static struct device_node *find_target_node(struct device_node *info_node)
 {
+	struct device_node *node;
 	const char *path;
 	u32 val;
 	int ret;
 
 	ret = of_property_read_u32(info_node, "target", &val);
-	if (!ret)
-		return of_find_node_by_phandle(val);
+	if (!ret) {
+		node = of_find_node_by_phandle(val);
+		if (!node)
+			pr_err("find target, node: %pOF, phandle 0x%x not found\n",
+			       info_node, val);
+		return node;
+	}
 
 	ret = of_property_read_string(info_node, "target-path", &path);
-	if (!ret)
-		return of_find_node_by_path(path);
+	if (!ret) {
+		node =  of_find_node_by_path(path);
+		if (!node)
+			pr_err("find target, node: %pOF, path '%s' not found\n",
+			       info_node, path);
+		return node;
+	}
 
-	pr_err("Failed to find target for node %p (%s)\n",
-		info_node, info_node->name);
+	pr_err("find target, node: %pOF, no target property\n", info_node);
 
 	return NULL;
 }
 
 /**
  * init_overlay_changeset() - initialize overlay changeset from overlay tree
- * @ovcs	Overlay changeset to build
+ * @ovcs:	Overlay changeset to build
+ * @fdt:	the FDT that was unflattened to create @tree
  * @tree:	Contains all the overlay fragments and overlay fixup nodes
  *
  * Initialize @ovcs.  Populate @ovcs->fragments with node information from
@@ -514,7 +530,7 @@ static struct device_node *find_target_node(struct device_node *info_node)
  * detected in @tree, or -ENOSPC if idr_alloc() error.
  */
 static int init_overlay_changeset(struct overlay_changeset *ovcs,
-		struct device_node *tree)
+		const void *fdt, struct device_node *tree)
 {
 	struct device_node *node, *overlay_node;
 	struct fragment *fragment;
@@ -535,6 +551,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
 		pr_debug("%s() tree is not root\n", __func__);
 
 	ovcs->overlay_tree = tree;
+	ovcs->fdt = fdt;
 
 	INIT_LIST_HEAD(&ovcs->ovcs_list);
 
@@ -606,6 +623,7 @@ static int init_overlay_changeset(struct overlay_changeset *ovcs,
 	}
 
 	if (!cnt) {
+		pr_err("no fragments or symbols in overlay\n");
 		ret = -EINVAL;
 		goto err_free_fragments;
 	}
@@ -642,11 +660,24 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
 	}
 	kfree(ovcs->fragments);
 
+	/*
+	 * TODO
+	 *
+	 * would like to: kfree(ovcs->overlay_tree);
+	 * but can not since drivers may have pointers into this data
+	 *
+	 * would like to: kfree(ovcs->fdt);
+	 * but can not since drivers may have pointers into this data
+	 */
+
 	kfree(ovcs);
 }
 
-/**
+/*
+ * internal documentation
+ *
  * of_overlay_apply() - Create and apply an overlay changeset
+ * @fdt:	the FDT that was unflattened to create @tree
  * @tree:	Expanded overlay device tree
  * @ovcs_id:	Pointer to overlay changeset id
  *
@@ -685,21 +716,29 @@ static void free_overlay_changeset(struct overlay_changeset *ovcs)
  * id is returned to *ovcs_id.
  */
 
-int of_overlay_apply(struct device_node *tree, int *ovcs_id)
+static int of_overlay_apply(const void *fdt, struct device_node *tree,
+		int *ovcs_id)
 {
 	struct overlay_changeset *ovcs;
 	int ret = 0, ret_revert, ret_tmp;
 
-	*ovcs_id = 0;
+	/*
+	 * As of this point, fdt and tree belong to the overlay changeset.
+	 * overlay changeset code is responsible for freeing them.
+	 */
 
 	if (devicetree_corrupt()) {
 		pr_err("devicetree state suspect, refuse to apply overlay\n");
+		kfree(fdt);
+		kfree(tree);
 		ret = -EBUSY;
 		goto out;
 	}
 
 	ovcs = kzalloc(sizeof(*ovcs), GFP_KERNEL);
 	if (!ovcs) {
+		kfree(fdt);
+		kfree(tree);
 		ret = -ENOMEM;
 		goto out;
 	}
@@ -709,12 +748,17 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
 
 	ret = of_resolve_phandles(tree);
 	if (ret)
-		goto err_free_overlay_changeset;
+		goto err_free_tree;
 
-	ret = init_overlay_changeset(ovcs, tree);
+	ret = init_overlay_changeset(ovcs, fdt, tree);
 	if (ret)
-		goto err_free_overlay_changeset;
+		goto err_free_tree;
 
+	/*
+	 * after overlay_notify(), ovcs->overlay_tree related pointers may have
+	 * leaked to drivers, so can not kfree() tree, aka ovcs->overlay_tree;
+	 * and can not free fdt, aka ovcs->fdt
+	 */
 	ret = overlay_notify(ovcs, OF_OVERLAY_PRE_APPLY);
 	if (ret) {
 		pr_err("overlay changeset pre-apply notify error %d\n", ret);
@@ -754,6 +798,10 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
 
 	goto out_unlock;
 
+err_free_tree:
+	kfree(fdt);
+	kfree(tree);
+
 err_free_overlay_changeset:
 	free_overlay_changeset(ovcs);
 
@@ -766,7 +814,63 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(of_overlay_apply);
+
+int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
+			 int *ovcs_id)
+{
+	const void *new_fdt;
+	int ret;
+	u32 size;
+	struct device_node *overlay_root;
+
+	*ovcs_id = 0;
+	ret = 0;
+
+	if (overlay_fdt_size < sizeof(struct fdt_header) ||
+	    fdt_check_header(overlay_fdt)) {
+		pr_err("Invalid overlay_fdt header\n");
+		return -EINVAL;
+	}
+
+	size = fdt_totalsize(overlay_fdt);
+	if (overlay_fdt_size < size)
+		return -EINVAL;
+
+	/*
+	 * Must create permanent copy of FDT because of_fdt_unflatten_tree()
+	 * will create pointers to the passed in FDT in the unflattened tree.
+	 */
+	new_fdt = kmemdup(overlay_fdt, size, GFP_KERNEL);
+	if (!new_fdt)
+		return -ENOMEM;
+
+	of_fdt_unflatten_tree(new_fdt, NULL, &overlay_root);
+	if (!overlay_root) {
+		pr_err("unable to unflatten overlay_fdt\n");
+		ret = -EINVAL;
+		goto out_free_new_fdt;
+	}
+
+	ret = of_overlay_apply(new_fdt, overlay_root, ovcs_id);
+	if (ret < 0) {
+		/*
+		 * new_fdt and overlay_root now belong to the overlay
+		 * changeset.
+		 * overlay changeset code is responsible for freeing them.
+		 */
+		goto out;
+	}
+
+	return 0;
+
+
+out_free_new_fdt:
+	kfree(new_fdt);
+
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(of_overlay_fdt_apply);
 
 /*
  * Find @np in @tree.

drivers/of/resolver.c

@@ -269,17 +269,11 @@ int of_resolve_phandles(struct device_node *overlay)
 		goto out;
 	}
 
-#if 0
-	Temporarily disable check so that old style overlay unittests
-	do not fail when of_resolve_phandles() is moved into
-	of_overlay_apply().
-
 	if (!of_node_check_flag(overlay, OF_DETACHED)) {
 		pr_err("overlay not detached\n");
 		err = -EINVAL;
 		goto out;
 	}
-#endif
 
 	phandle_delta = live_tree_max_phandle() + 1;
 	adjust_overlay_phandles(overlay, phandle_delta);

drivers/of/unittest-data/Makefile

 # SPDX-License-Identifier: GPL-2.0
-DTC_FLAGS_testcases := -Wno-interrupts_property
 obj-y += testcases.dtb.o
 
 obj-$(CONFIG_OF_OVERLAY) += overlay.dtb.o \
+			    overlay_0.dtb.o \
+			    overlay_1.dtb.o \
+			    overlay_2.dtb.o \
+			    overlay_3.dtb.o \
+			    overlay_4.dtb.o \
+			    overlay_5.dtb.o \
+			    overlay_6.dtb.o \
+			    overlay_7.dtb.o \
+			    overlay_8.dtb.o \
+			    overlay_9.dtb.o \
+			    overlay_10.dtb.o \
+			    overlay_11.dtb.o \
+			    overlay_12.dtb.o \
+			    overlay_13.dtb.o \
+			    overlay_15.dtb.o \
 			    overlay_bad_phandle.dtb.o \
 			    overlay_bad_symbol.dtb.o \
 			    overlay_base.dtb.o
@@ -10,10 +24,14 @@ obj-$(CONFIG_OF_OVERLAY) += overlay.dtb.o \
 targets += $(foreach suffix, dtb dtb.S, $(patsubst %.dtb.o,%.$(suffix),$(obj-y)))
 
 # enable creation of __symbols__ node
-DTC_FLAGS_overlay := -@
-DTC_FLAGS_overlay_bad_phandle := -@
-DTC_FLAGS_overlay_bad_symbol := -@
-DTC_FLAGS_overlay_base := -@
+DTC_FLAGS_overlay += -@
+DTC_FLAGS_overlay_bad_phandle += -@
+DTC_FLAGS_overlay_bad_symbol += -@
+DTC_FLAGS_overlay_base += -@
+DTC_FLAGS_testcases += -@
+
+# suppress warnings about intentional errors
+DTC_FLAGS_testcases += -Wno-interrupts_property
 
 .PRECIOUS: \
 	$(obj)/%.dtb.S \

drivers/of/unittest-data/overlay.dts

@@ -2,76 +2,63 @@
 /dts-v1/;
 /plugin/;
 
-/ {
+&electric_1 {
 
-	fragment@0 {
-		target = <&electric_1>;
+	status = "okay";
 
-		__overlay__ {
-			status = "okay";
-
-			hvac_2: hvac-large-1 {
-				compatible = "ot,hvac-large";
-				heat-range = < 40 75 >;
-				cool-range = < 65 80 >;
-			};
-		};
+	hvac_2: hvac-large-1 {
+		compatible = "ot,hvac-large";
+		heat-range = < 40 75 >;
+		cool-range = < 65 80 >;
 	};
+};
 
-	fragment@1 {
-		target = <&rides_1>;
-
-		__overlay__ {
-			#address-cells = <1>;
-			#size-cells = <1>;
-			status = "okay";
-
-			ride@100 {
-				#address-cells = <1>;
-				#size-cells = <1>;
-
-				track@30 {
-					incline-up = < 48 32 16 >;
-				};
+&rides_1 {
 
-				track@40 {
-					incline-up = < 47 31 15 >;
-				};
-			};
+	#address-cells = <1>;
+	#size-cells = <1>;
+	status = "okay";
 
-			ride_200: ride@200 {
-				#address-cells = <1>;
-				#size-cells = <1>;
-				compatible = "ot,ferris-wheel";
-				reg = < 0x00000200 0x100 >;
-				hvac-provider = < &hvac_2 >;
-				hvac-thermostat = < 27 32 > ;
-				hvac-zones = < 12 5 >;
-				hvac-zone-names = "operator", "snack-bar";
-				spin-controller = < &spin_ctrl_1 3 >;
-				spin-rph = < 30 >;
-				gondolas = < 16 >;
-				gondola-capacity = < 6 >;
+	ride@100 {
+		#address-cells = <1>;
+		#size-cells = <1>;
 
-				ride_200_left: track@10 {
-					reg = < 0x00000010 0x10 >;
-				};
+		track@30 {
+			incline-up = < 48 32 16 >;
+		};
 
-				ride_200_right: track@20 {
-					reg = < 0x00000020 0x10 >;
-				};
-			};
+		track@40 {
+			incline-up = < 47 31 15 >;
 		};
 	};
 
-	fragment@2 {
-		target = <&lights_2>;
+	ride_200: ride@200 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "ot,ferris-wheel";
+		reg = < 0x00000200 0x100 >;
+		hvac-provider = < &hvac_2 >;
+		hvac-thermostat = < 27 32 > ;
+		hvac-zones = < 12 5 >;
+		hvac-zone-names = "operator", "snack-bar";
+		spin-controller = < &spin_ctrl_1 3 >;
+		spin-rph = < 30 >;
+		gondolas = < 16 >;
+		gondola-capacity = < 6 >;
+
+		ride_200_left: track@10 {
+			reg = < 0x00000010 0x10 >;
+		};
 
-		__overlay__ {
-			status = "okay";
-			color = "purple", "white", "red", "green";
-			rate = < 3 256 >;
+		ride_200_right: track@20 {
+			reg = < 0x00000020 0x10 >;
 		};
 	};
+};
+
+&lights_2 {
 
+	status = "okay";
+	color = "purple", "white", "red", "green";
+	rate = < 3 256 >;
 };

drivers/of/unittest-data/overlay_0.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_0 - enable using absolute target path */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest0";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};

drivers/of/unittest-data/overlay_1.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_1 - disable using absolute target path */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest1";
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+};

drivers/of/unittest-data/overlay_10.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_10 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest10 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <10>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		test-unittest101 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
+		};
+	};
+};

drivers/of/unittest-data/overlay_11.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_11 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest11 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <11>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		test-unittest111 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
+		};
+
+	};
+};

drivers/of/unittest-data/overlay_12.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_12 - enable using absolute target path (i2c) */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};

drivers/of/unittest-data/overlay_13.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_13 - disable using absolute target path (i2c) */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13";
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+};

drivers/of/unittest-data/overlay_15.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_15 - mux overlay */
+
+&unittest_i2c_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	test-unittest15 {
+		reg = <11>;
+		compatible = "unittest-i2c-mux";
+		status = "okay";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+
+			test-mux-dev {
+				reg = <32>;
+				compatible = "unittest-i2c-dev";
+				status = "okay";
+			};
+		};
+	};
+};

drivers/of/unittest-data/overlay_2.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_2 -  enable using label */
+
+&unittest2 {
+	status = "okay";
+};

drivers/of/unittest-data/overlay_3.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_3 - disable using label */
+
+&unittest3 {
+	status = "disabled";
+};

drivers/of/unittest-data/overlay_4.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_4 - test insertion of a full node */
+
+&unittest_test_bus {
+
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	test-unittest4 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <4>;
+	};
+};

drivers/of/unittest-data/overlay_5.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_5 - test overlay apply revert */
+
+&unittest5 {
+	status = "okay";
+};

drivers/of/unittest-data/overlay_6.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_6 */
+/* overlays 6, 7 application and removal in sequence */
+
+&unittest6 {
+	status = "okay";
+};

drivers/of/unittest-data/overlay_7.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_7 */
+/* overlays 6, 7 application and removal in sequence */
+
+&unittest7 {
+	status = "okay";
+};

drivers/of/unittest-data/overlay_8.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_8 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest8 {
+	status = "okay";
+};

drivers/of/unittest-data/overlay_9.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/* overlay_9 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+&unittest8 {
+	property-foo = "bar";
+};

drivers/of/unittest-data/overlay_bad_phandle.dts

@@ -2,20 +2,13 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-
-	fragment@0 {
-		target = <&electric_1>;
-
-		__overlay__ {
-
-			// This label should cause an error when the overlay
-			// is applied.  There is already a phandle value
-			// in the base tree for motor-1.
-			spin_ctrl_1_conflict: motor-1 {
-				accelerate = < 3 >;
-				decelerate = < 5 >;
-			};
-		};
+&electric_1 {
+
+	// This label should cause an error when the overlay
+	// is applied.  There is already a phandle value
+	// in the base tree for motor-1.
+	spin_ctrl_1_conflict: motor-1 {
+		accelerate = < 3 >;
+		decelerate = < 5 >;
 	};
 };

drivers/of/unittest-data/overlay_bad_symbol.dts

@@ -2,22 +2,15 @@
 /dts-v1/;
 /plugin/;
 
-/ {
+&electric_1 {
 
-	fragment@0 {
-		target = <&electric_1>;
-
-		__overlay__ {
-
-			// This label should cause an error when the overlay
-			// is applied.  There is already a symbol hvac_1
-			// in the base tree
-			hvac_1: hvac-medium-2 {
-				compatible = "ot,hvac-medium";
-				heat-range = < 50 75 >;
-				cool-range = < 60 80 >;
-			};
-
-		};
+	// This label should cause an error when the overlay
+	// is applied.  There is already a symbol hvac_1
+	// in the base tree
+	hvac_1: hvac-medium-2 {
+		compatible = "ot,hvac-medium";
+		heat-range = < 50 75 >;
+		cool-range = < 60 80 >;
 	};
+
 };

drivers/of/unittest-data/tests-overlay.dtsi

@@ -5,7 +5,7 @@ testcase-data {
 		overlay-node {
 
 			/* test bus */
-			unittestbus: test-bus {
+			unittest_test_bus: test-bus {
 				compatible = "simple-bus";
 				#address-cells = <1>;
 				#size-cells = <0>;
@@ -70,7 +70,7 @@ unittest8: test-unittest8 {
 					reg = <8>;
 				};
 
-				i2c-test-bus {
+				unittest_i2c_test_bus: i2c-test-bus {
 					compatible = "unittest-i2c-bus";
 					status = "okay";
 					reg = <50>;
@@ -113,218 +113,5 @@ test-mux-dev {
 				};
 			};
 		};
-
-		/* test enable using absolute target path */
-		overlay0 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest0";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-
-		/* test disable using absolute target path */
-		overlay1 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest1";
-				__overlay__ {
-					status = "disabled";
-				};
-			};
-		};
-
-		/* test enable using label */
-		overlay2 {
-			fragment@0 {
-				target = <&unittest2>;
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-
-		/* test disable using label */
-		overlay3 {
-			fragment@0 {
-				target = <&unittest3>;
-				__overlay__ {
-					status = "disabled";
-				};
-			};
-		};
-
-		/* test insertion of a full node */
-		overlay4 {
-			fragment@0 {
-				target = <&unittestbus>;
-				__overlay__ {
-
-					/* suppress DTC warning */
-					#address-cells = <1>;
-					#size-cells = <0>;
-
-					test-unittest4 {
-						compatible = "unittest";
-						status = "okay";
-						reg = <4>;
-					};
-				};
-			};
-		};
-
-		/* test overlay apply revert */
-		overlay5 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest5";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-
-		/* test overlays application and removal in sequence */
-		overlay6 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest6";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-		overlay7 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest7";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-
-		/* test overlays application and removal in bad sequence */
-		overlay8 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-		overlay9 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
-				__overlay__ {
-					property-foo = "bar";
-				};
-			};
-		};
-
-		overlay10 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus";
-				__overlay__ {
-
-					/* suppress DTC warning */
-					#address-cells = <1>;
-					#size-cells = <0>;
-
-					test-unittest10 {
-						compatible = "unittest";
-						status = "okay";
-						reg = <10>;
-
-						#address-cells = <1>;
-						#size-cells = <0>;
-
-						test-unittest101 {
-							compatible = "unittest";
-							status = "okay";
-							reg = <1>;
-						};
-
-					};
-				};
-			};
-		};
-
-		overlay11 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus";
-				__overlay__ {
-
-					/* suppress DTC warning */
-					#address-cells = <1>;
-					#size-cells = <0>;
-
-					test-unittest11 {
-						compatible = "unittest";
-						status = "okay";
-						reg = <11>;
-
-						#address-cells = <1>;
-						#size-cells = <0>;
-
-						test-unittest111 {
-							compatible = "unittest";
-							status = "okay";
-							reg = <1>;
-						};
-
-					};
-				};
-			};
-		};
-
-		/* test enable using absolute target path (i2c) */
-		overlay12 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12";
-				__overlay__ {
-					status = "okay";
-				};
-			};
-		};
-
-		/* test disable using absolute target path (i2c) */
-		overlay13 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13";
-				__overlay__ {
-					status = "disabled";
-				};
-			};
-		};
-
-		/* test mux overlay */
-		overlay15 {
-			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
-				__overlay__ {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					test-unittest15 {
-						reg = <11>;
-						compatible = "unittest-i2c-mux";
-						status = "okay";
-
-						#address-cells = <1>;
-						#size-cells = <0>;
-
-						i2c@0 {
-							#address-cells = <1>;
-							#size-cells = <0>;
-							reg = <0>;
-
-							test-mux-dev {
-								reg = <32>;
-								compatible = "unittest-i2c-dev";
-								status = "okay";
-							};
-						};
-					};
-				};
-			};
-		};
-
 	};
 };

include/linux/of.h

@@ -1359,8 +1359,8 @@ struct of_overlay_notify_data {
 
 #ifdef CONFIG_OF_OVERLAY
 
-/* ID based overlays; the API for external users */
-int of_overlay_apply(struct device_node *tree, int *ovcs_id);
+int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
+			 int *ovcs_id);
 int of_overlay_remove(int *ovcs_id);
 int of_overlay_remove_all(void);
 
@@ -1369,7 +1369,7 @@ int of_overlay_notifier_unregister(struct notifier_block *nb);
 
 #else
 
-static inline int of_overlay_apply(struct device_node *tree, int *ovcs_id)
+static inline int of_overlay_fdt_apply(void *overlay_fdt, int *ovcs_id)
 {
 	return -ENOTSUPP;
 }