[PATCH 0/2] of: change overlay apply input data from EDT to FDT

[PATCH 0/2] of: change overlay apply input data from EDT to FDT

[frowand.list-Re5JQEeQqe8AvxtiuMwx3w]

From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

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().

The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
code, which is thus responsible for freeing the duplicate FDT.  The
caller of of_overlay_fdt_apply() remains responsible for freeing the
original FDT.

The unflattened device tree (aka expanded device tree, EDT) now
belongs to devicetree code, which is thus responsible for freeing
the EDT.

These ownership changes prevent early freeing of the duplicated FDT
or the EDT, which could result in use after free errors.

These changes led to migrating some unittest overlay data into
their own devicetree source files, and then converting most of
them to use sugar syntax instead of hand coding fragments.

Frank Rowand (2):
  of: change overlay apply input data from EDT to FDT
  of: convert unittest overlay devicetree source to sugar syntax

 drivers/of/of_private.h                          |   1 +
 drivers/of/overlay.c                             | 124 +++++++++-
 drivers/of/resolver.c                            |   6 -
 drivers/of/unittest-data/Makefile                |  16 ++
 drivers/of/unittest-data/overlay.dts             | 101 ++++----
 drivers/of/unittest-data/overlay_0.dts           |  14 ++
 drivers/of/unittest-data/overlay_1.dts           |  14 ++
 drivers/of/unittest-data/overlay_10.dts          |  27 +++
 drivers/of/unittest-data/overlay_11.dts          |  28 +++
 drivers/of/unittest-data/overlay_12.dts          |  14 ++
 drivers/of/unittest-data/overlay_13.dts          |  14 ++
 drivers/of/unittest-data/overlay_15.dts          |  30 +++
 drivers/of/unittest-data/overlay_2.dts           |   9 +
 drivers/of/unittest-data/overlay_3.dts           |   9 +
 drivers/of/unittest-data/overlay_4.dts           |  18 ++
 drivers/of/unittest-data/overlay_5.dts           |   9 +
 drivers/of/unittest-data/overlay_6.dts           |  10 +
 drivers/of/unittest-data/overlay_7.dts           |  10 +
 drivers/of/unittest-data/overlay_8.dts           |  10 +
 drivers/of/unittest-data/overlay_9.dts           |  10 +
 drivers/of/unittest-data/overlay_bad_phandle.dts |  23 +-
 drivers/of/unittest-data/overlay_bad_symbol.dts  |  27 +--
 drivers/of/unittest-data/tests-overlay.dtsi      | 217 +----------------
 drivers/of/unittest.c                            | 296 +++++++++++------------
 include/linux/of.h                               |   7 -
 25 files changed, 564 insertions(+), 480 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_0.dts
 create mode 100644 drivers/of/unittest-data/overlay_1.dts
 create mode 100644 drivers/of/unittest-data/overlay_10.dts
 create mode 100644 drivers/of/unittest-data/overlay_11.dts
 create mode 100644 drivers/of/unittest-data/overlay_12.dts
 create mode 100644 drivers/of/unittest-data/overlay_13.dts
 create mode 100644 drivers/of/unittest-data/overlay_15.dts
 create mode 100644 drivers/of/unittest-data/overlay_2.dts
 create mode 100644 drivers/of/unittest-data/overlay_3.dts
 create mode 100644 drivers/of/unittest-data/overlay_4.dts
 create mode 100644 drivers/of/unittest-data/overlay_5.dts
 create mode 100644 drivers/of/unittest-data/overlay_6.dts
 create mode 100644 drivers/of/unittest-data/overlay_7.dts
 create mode 100644 drivers/of/unittest-data/overlay_8.dts
 create mode 100644 drivers/of/unittest-data/overlay_9.dts

-- 
Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

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[PATCH 1/2] of: change overlay apply input data from EDT to FDT

[frowand.list-Re5JQEeQqe8AvxtiuMwx3w]

From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

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().

The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
code, which is thus responsible for freeing the duplicate FDT.  The
caller of of_overlay_fdt_apply() remains responsible for freeing the
original FDT.

The unflattened device tree (aka expanded device tree, EDT) now
belongs to devicetree code, which is thus responsible for freeing
the EDT.

These ownership changes prevent early freeing of the duplicated FDT
or the EDT, which could result in use after free errors.

of_overlay_fdt_apply() is a private function for the anticipated
overlay loader.

Update unittest.c to use of_overlay_fdt_apply() instead of
of_overlay_apply().

Move overlay fragments from artificial locations in
drivers/of/unittest-data/tests-overlay.dtsi into one devicetree
source file per overlay.  This led to changes in
drivers/of/unitest-data/Makefile and drivers/of/unitest.c.

  - Add overlay directives to the overlay devicetree source files so
    that dtc will compile them as true overlays into one FDT data
    chunk per overlay.

  - Set CFLAGS for drivers/of/unittest-data/testcases.dts so that
    symbols will be generated for overlay resolution of overlays
    that are no longer artificially contained in testcases.dts

  - Unflatten and apply each unittest overlay FDT using
    of_overlay_fdt_apply().

  - Enable the of_resolve_phandles() check for whether the overlay
    EDT is detached.  This check was previously disabled because the
    overlays from tests-overlay.dtsi were not unflattened into detached
    trees.

  - Other changes to unittest.c infrastructure to manage multiple test
    FDTs built into the kernel image (access by name instead of
    arbitrary number).

  - of_unittest_overlay_high_level(): previously unused code to add
    properties from the overlay_base devicetree to the live tree
    was triggered by the restructuring of tests-overlay.dtsi and thus
    testcases.dts.  This exposed two bugs: (1) the need to dup a
    property before adding it, and (2) property 'name' is
    auto-generated in the unflatten code and thus will be a duplicate
    in the __symbols__ node - do not treat this duplicate as an error.

Errors while developing the patch exposed inadequate error messages
to debug problems when overlay devicetree fragment nodes contain
an invalid target path.  Improved the messages in find_target_node().

Signed-off-by: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
---

Dependency, a patch already applied by robh for next:

  From: Masahiro Yamada <yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>
  Subject: [PATCH] of: unittest: refactor Makefile
  https://lkml.kernel.org/r/<1515153330-11810-1-git-send-email-yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>

Created on 4.15.

I will respin this patch on top of 4.15-rc1.

There are checkpatch warnings.  I have reviewed them and feel they
can be ignored.  They are "line over 80 characters" for either
pre-existing long lines, or lines in devicetree source files.


 drivers/of/of_private.h                     |   1 +
 drivers/of/overlay.c                        | 124 ++++++++++--
 drivers/of/resolver.c                       |   6 -
 drivers/of/unittest-data/Makefile           |  16 ++
 drivers/of/unittest-data/overlay_0.dts      |  14 ++
 drivers/of/unittest-data/overlay_1.dts      |  14 ++
 drivers/of/unittest-data/overlay_10.dts     |  34 ++++
 drivers/of/unittest-data/overlay_11.dts     |  34 ++++
 drivers/of/unittest-data/overlay_12.dts     |  14 ++
 drivers/of/unittest-data/overlay_13.dts     |  14 ++
 drivers/of/unittest-data/overlay_15.dts     |  35 ++++
 drivers/of/unittest-data/overlay_2.dts      |  14 ++
 drivers/of/unittest-data/overlay_3.dts      |  14 ++
 drivers/of/unittest-data/overlay_4.dts      |  23 +++
 drivers/of/unittest-data/overlay_5.dts      |  14 ++
 drivers/of/unittest-data/overlay_6.dts      |  15 ++
 drivers/of/unittest-data/overlay_7.dts      |  15 ++
 drivers/of/unittest-data/overlay_8.dts      |  15 ++
 drivers/of/unittest-data/overlay_9.dts      |  15 ++
 drivers/of/unittest-data/tests-overlay.dtsi | 213 --------------------
 drivers/of/unittest.c                       | 296 ++++++++++++++--------------
 include/linux/of.h                          |   7 -
 22 files changed, 558 insertions(+), 389 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_0.dts
 create mode 100644 drivers/of/unittest-data/overlay_1.dts
 create mode 100644 drivers/of/unittest-data/overlay_10.dts
 create mode 100644 drivers/of/unittest-data/overlay_11.dts
 create mode 100644 drivers/of/unittest-data/overlay_12.dts
 create mode 100644 drivers/of/unittest-data/overlay_13.dts
 create mode 100644 drivers/of/unittest-data/overlay_15.dts
 create mode 100644 drivers/of/unittest-data/overlay_2.dts
 create mode 100644 drivers/of/unittest-data/overlay_3.dts
 create mode 100644 drivers/of/unittest-data/overlay_4.dts
 create mode 100644 drivers/of/unittest-data/overlay_5.dts
 create mode 100644 drivers/of/unittest-data/overlay_6.dts
 create mode 100644 drivers/of/unittest-data/overlay_7.dts
 create mode 100644 drivers/of/unittest-data/overlay_8.dts
 create mode 100644 drivers/of/unittest-data/overlay_9.dts

diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 92a9a3687446..4328662e9d8d 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -81,6 +81,7 @@ static inline void __of_detach_node_sysfs(struct device_node *np) {}
 #endif
 
 #if defined(CONFIG_OF_OVERLAY)
+int of_overlay_fdt_apply(void *overlay_fdt, int *ovcs_id);
 void of_overlay_mutex_lock(void);
 void of_overlay_mutex_unlock(void);
 #else
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 3981b7da4fa9..7f26ff47c012 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -15,10 +15,12 @@
 #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>
 
@@ -36,7 +38,9 @@ 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
@@ -46,6 +50,7 @@ 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;
@@ -486,17 +491,26 @@ 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("target node find by phandle failed\n");
+		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("target node find by path failed\n");
+		return node;
+	}
 
 	pr_err("Failed to find target for node %p (%s)\n",
 		info_node, info_node->name);
@@ -506,7 +520,8 @@ static struct device_node *find_target_node(struct device_node *info_node)
 
 /**
  * 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
@@ -517,7 +532,7 @@ 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;
@@ -538,6 +553,7 @@ 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);
 
@@ -609,6 +625,7 @@ 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;
 	}
@@ -645,11 +662,24 @@ 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
  *
@@ -688,21 +718,29 @@ 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;
 	}
@@ -712,12 +750,17 @@ 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);
@@ -757,6 +800,9 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
 
 	goto out_unlock;
 
+err_free_tree:
+	kfree(tree);
+
 err_free_overlay_changeset:
 	free_overlay_changeset(ovcs);
 
@@ -769,7 +815,59 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(of_overlay_apply);
+
+int of_overlay_fdt_apply(void *overlay_fdt, int *ovcs_id)
+{
+	const void *new_fdt;
+	int ret;
+	u32 size;
+	struct device_node *overlay_root;
+
+	*ovcs_id = 0;
+	ret = 0;
+
+	if (fdt_check_header(overlay_fdt)) {
+		pr_err("Invalid overlay_fdt header\n");
+		return -EINVAL;
+	}
+
+	size = fdt_totalsize(overlay_fdt);
+
+	/*
+	 * Must create permanent copy of FDT because of_fdt_unflatten_tree()
+	 * will create pointers to the passed in FDT in the EDT.
+	 */
+	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.
diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index cfaeef5f6cb1..dcf34853c536 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -272,17 +272,11 @@ 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);
diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
index df697976740a..2b7ee68c908e 100644
--- a/drivers/of/unittest-data/Makefile
+++ b/drivers/of/unittest-data/Makefile
@@ -3,6 +3,21 @@ 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
@@ -14,6 +29,7 @@ DTC_FLAGS_overlay := -@
 DTC_FLAGS_overlay_bad_phandle := -@
 DTC_FLAGS_overlay_bad_symbol := -@
 DTC_FLAGS_overlay_base := -@
+DTC_FLAGS_testcases := -@
 
 .PRECIOUS: \
 	$(obj)/%.dtb.S \
diff --git a/drivers/of/unittest-data/overlay_0.dts b/drivers/of/unittest-data/overlay_0.dts
new file mode 100644
index 000000000000..ac0f9e0fe65f
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_0.dts
@@ -0,0 +1,14 @@
+// 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";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_1.dts b/drivers/of/unittest-data/overlay_1.dts
new file mode 100644
index 000000000000..e92a626e2948
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_1.dts
@@ -0,0 +1,14 @@
+// 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";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_10.dts b/drivers/of/unittest-data/overlay_10.dts
new file mode 100644
index 000000000000..445925a10cd3
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_10.dts
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_10 */
+	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+	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>;
+				};
+
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_11.dts b/drivers/of/unittest-data/overlay_11.dts
new file mode 100644
index 000000000000..c1d14f34359e
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_11.dts
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_11 */
+	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+	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>;
+				};
+
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_12.dts b/drivers/of/unittest-data/overlay_12.dts
new file mode 100644
index 000000000000..ca3441e2cbec
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_12.dts
@@ -0,0 +1,14 @@
+// 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";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_13.dts b/drivers/of/unittest-data/overlay_13.dts
new file mode 100644
index 000000000000..3c30dec63894
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_13.dts
@@ -0,0 +1,14 @@
+// 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";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_15.dts b/drivers/of/unittest-data/overlay_15.dts
new file mode 100644
index 000000000000..44e44c62b739
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_15.dts
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_15 - mux overlay */
+
+	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";
+					};
+				};
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_2.dts b/drivers/of/unittest-data/overlay_2.dts
new file mode 100644
index 000000000000..cf1e4245b7ce
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_2.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_2 -  enable using label */
+
+	fragment@0 {
+		target = <&unittest2>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_3.dts b/drivers/of/unittest-data/overlay_3.dts
new file mode 100644
index 000000000000..158dc44fc20a
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_3.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_3 - disable using label */
+
+	fragment@0 {
+		target = <&unittest3>;
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_4.dts b/drivers/of/unittest-data/overlay_4.dts
new file mode 100644
index 000000000000..b4a2e6c6b016
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_4.dts
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_4 - test insertion of a full node */
+
+	fragment@0 {
+		target = <&unittestbus>;
+		__overlay__ {
+
+			/* suppress DTC warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			test-unittest4 {
+				compatible = "unittest";
+				status = "okay";
+				reg = <4>;
+			};
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_5.dts b/drivers/of/unittest-data/overlay_5.dts
new file mode 100644
index 000000000000..02ad25c1f19c
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_5.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_5 - test overlay apply revert */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest5";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_6.dts b/drivers/of/unittest-data/overlay_6.dts
new file mode 100644
index 000000000000..a14e965f5497
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_6.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_6 */
+	/* overlays 6, 7 application and removal in sequence */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest6";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_7.dts b/drivers/of/unittest-data/overlay_7.dts
new file mode 100644
index 000000000000..4bd7e423209c
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_7.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_7 */
+	/* overlays 6, 7 application and removal in sequence */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest7";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_8.dts b/drivers/of/unittest-data/overlay_8.dts
new file mode 100644
index 000000000000..5b21c53945a9
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_8.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_8 */
+	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_9.dts b/drivers/of/unittest-data/overlay_9.dts
new file mode 100644
index 000000000000..20ff055a5349
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_9.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+/ {
+	/* overlay_9 */
+	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+
+	fragment@0 {
+		target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
+		__overlay__ {
+			property-foo = "bar";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/tests-overlay.dtsi b/drivers/of/unittest-data/tests-overlay.dtsi
index 7b8001ab9f3a..fa2fb43bccac 100644
--- a/drivers/of/unittest-data/tests-overlay.dtsi
+++ b/drivers/of/unittest-data/tests-overlay.dtsi
@@ -113,218 +113,5 @@
 				};
 			};
 		};
-
-		/* 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";
-							};
-						};
-					};
-				};
-			};
-		};
-
 	};
 };
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 0f8052f1355c..e220d27e53bb 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -44,6 +44,8 @@
 	failed; \
 })
 
+static int __init overlay_data_apply(const char *overlay_name, int *overlay_id);
+
 static void __init of_unittest_find_node_by_name(void)
 {
 	struct device_node *np;
@@ -996,8 +998,7 @@ static int __init unittest_data_add(void)
 	}
 
 	/*
-	 * This lock normally encloses of_overlay_apply() as well as
-	 * of_resolve_phandles().
+	 * This lock normally encloses of_resolve_phandles()
 	 */
 	of_overlay_mutex_lock();
 
@@ -1190,12 +1191,12 @@ static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
 	return 0;
 }
 
-static const char *overlay_path(int nr)
+static const char *overlay_name_from_nr(int nr)
 {
 	static char buf[256];
 
 	snprintf(buf, sizeof(buf) - 1,
-		"/testcase-data/overlay%d", nr);
+		"overlay_%d", nr);
 	buf[sizeof(buf) - 1] = '\0';
 
 	return buf;
@@ -1262,25 +1263,19 @@ static void of_unittest_destroy_tracked_overlays(void)
 	} while (defers > 0);
 }
 
-static int of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
+static int __init of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
 		int *overlay_id)
 {
 	struct device_node *np = NULL;
+	const char *overlay_name;
 	int ret;
 
-	np = of_find_node_by_path(overlay_path(overlay_nr));
-	if (np == NULL) {
-		unittest(0, "could not find overlay node @\"%s\"\n",
-				overlay_path(overlay_nr));
-		ret = -EINVAL;
-		goto out;
-	}
+	overlay_name = overlay_name_from_nr(overlay_nr);
 
-	*overlay_id = 0;
-	ret = of_overlay_apply(np, overlay_id);
-	if (ret < 0) {
-		unittest(0, "could not create overlay from \"%s\"\n",
-				overlay_path(overlay_nr));
+	ret = overlay_data_apply(overlay_name, overlay_id);
+	if (!ret) {
+		unittest(0, "could not apply overlay \"%s\"\n",
+				overlay_name);
 		goto out;
 	}
 	of_unittest_track_overlay(*overlay_id);
@@ -1294,15 +1289,16 @@ static int of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
 }
 
 /* apply an overlay while checking before and after states */
-static int of_unittest_apply_overlay_check(int overlay_nr, int unittest_nr,
-		int before, int after, enum overlay_type ovtype)
+static int __init of_unittest_apply_overlay_check(int overlay_nr,
+		int unittest_nr, int before, int after,
+		enum overlay_type ovtype)
 {
 	int ret, ovcs_id;
 
 	/* unittest device must not be in before state */
 	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
-		unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s with device @\"%s\" %s\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
@@ -1317,8 +1313,8 @@ static int of_unittest_apply_overlay_check(int overlay_nr, int unittest_nr,
 
 	/* unittest device must be to set to after state */
 	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
-		unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s failed to create @\"%s\" %s\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype),
 				!after ? "enabled" : "disabled");
 		return -EINVAL;
@@ -1336,8 +1332,8 @@ static int of_unittest_apply_revert_overlay_check(int overlay_nr,
 
 	/* unittest device must be in before state */
 	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
-		unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s with device @\"%s\" %s\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
@@ -1353,8 +1349,8 @@ static int of_unittest_apply_revert_overlay_check(int overlay_nr,
 
 	/* unittest device must be in after state */
 	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
-		unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s failed to create @\"%s\" %s\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype),
 				!after ? "enabled" : "disabled");
 		return -EINVAL;
@@ -1362,16 +1358,16 @@ static int of_unittest_apply_revert_overlay_check(int overlay_nr,
 
 	ret = of_overlay_remove(&ovcs_id);
 	if (ret != 0) {
-		unittest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s failed to be destroyed @\"%s\"\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype));
 		return ret;
 	}
 
 	/* unittest device must be again in before state */
 	if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
-		unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
-				overlay_path(overlay_nr),
+		unittest(0, "%s with device @\"%s\" %s\n",
+				overlay_name_from_nr(overlay_nr),
 				unittest_path(unittest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
@@ -1381,7 +1377,7 @@ static int of_unittest_apply_revert_overlay_check(int overlay_nr,
 }
 
 /* test activation of device */
-static void of_unittest_overlay_0(void)
+static void __init of_unittest_overlay_0(void)
 {
 	int ret;
 
@@ -1394,7 +1390,7 @@ static void of_unittest_overlay_0(void)
 }
 
 /* test deactivation of device */
-static void of_unittest_overlay_1(void)
+static void __init of_unittest_overlay_1(void)
 {
 	int ret;
 
@@ -1407,7 +1403,7 @@ static void of_unittest_overlay_1(void)
 }
 
 /* test activation of device */
-static void of_unittest_overlay_2(void)
+static void __init of_unittest_overlay_2(void)
 {
 	int ret;
 
@@ -1420,7 +1416,7 @@ static void of_unittest_overlay_2(void)
 }
 
 /* test deactivation of device */
-static void of_unittest_overlay_3(void)
+static void __init of_unittest_overlay_3(void)
 {
 	int ret;
 
@@ -1433,7 +1429,7 @@ static void of_unittest_overlay_3(void)
 }
 
 /* test activation of a full device node */
-static void of_unittest_overlay_4(void)
+static void __init of_unittest_overlay_4(void)
 {
 	int ret;
 
@@ -1459,19 +1455,19 @@ static void of_unittest_overlay_5(void)
 }
 
 /* test overlay application in sequence */
-static void of_unittest_overlay_6(void)
+static void __init of_unittest_overlay_6(void)
 {
-	struct device_node *np;
 	int ret, i, ov_id[2], ovcs_id;
 	int overlay_nr = 6, unittest_nr = 6;
 	int before = 0, after = 1;
+	const char *overlay_name;
 
 	/* unittest device must be in before state */
 	for (i = 0; i < 2; i++) {
 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
 				!= before) {
-			unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
-					overlay_path(overlay_nr + i),
+			unittest(0, "%s with device @\"%s\" %s\n",
+					overlay_name_from_nr(overlay_nr + i),
 					unittest_path(unittest_nr + i,
 						PDEV_OVERLAY),
 					!before ? "enabled" : "disabled");
@@ -1482,18 +1478,12 @@ static void of_unittest_overlay_6(void)
 	/* apply the overlays */
 	for (i = 0; i < 2; i++) {
 
-		np = of_find_node_by_path(overlay_path(overlay_nr + i));
-		if (np == NULL) {
-			unittest(0, "could not find overlay node @\"%s\"\n",
-					overlay_path(overlay_nr + i));
-			return;
-		}
+		overlay_name = overlay_name_from_nr(overlay_nr + i);
 
-		ovcs_id = 0;
-		ret = of_overlay_apply(np, &ovcs_id);
-		if (ret < 0)  {
-			unittest(0, "could not create overlay from \"%s\"\n",
-					overlay_path(overlay_nr + i));
+		ret = overlay_data_apply(overlay_name, &ovcs_id);
+		if (!ret)  {
+			unittest(0, "could not apply overlay \"%s\"\n",
+					overlay_name);
 			return;
 		}
 		ov_id[i] = ovcs_id;
@@ -1505,7 +1495,7 @@ static void of_unittest_overlay_6(void)
 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
 				!= after) {
 			unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
-					overlay_path(overlay_nr + i),
+					overlay_name_from_nr(overlay_nr + i),
 					unittest_path(unittest_nr + i,
 						PDEV_OVERLAY),
 					!after ? "enabled" : "disabled");
@@ -1517,8 +1507,8 @@ static void of_unittest_overlay_6(void)
 		ovcs_id = ov_id[i];
 		ret = of_overlay_remove(&ovcs_id);
 		if (ret != 0) {
-			unittest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
-					overlay_path(overlay_nr + i),
+			unittest(0, "%s failed destroy @\"%s\"\n",
+					overlay_name_from_nr(overlay_nr + i),
 					unittest_path(unittest_nr + i,
 						PDEV_OVERLAY));
 			return;
@@ -1530,8 +1520,8 @@ static void of_unittest_overlay_6(void)
 		/* unittest device must be again in before state */
 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
 				!= before) {
-			unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
-					overlay_path(overlay_nr + i),
+			unittest(0, "%s with device @\"%s\" %s\n",
+					overlay_name_from_nr(overlay_nr + i),
 					unittest_path(unittest_nr + i,
 						PDEV_OVERLAY),
 					!before ? "enabled" : "disabled");
@@ -1543,29 +1533,23 @@ static void of_unittest_overlay_6(void)
 }
 
 /* test overlay application in sequence */
-static void of_unittest_overlay_8(void)
+static void __init of_unittest_overlay_8(void)
 {
-	struct device_node *np;
 	int ret, i, ov_id[2], ovcs_id;
 	int overlay_nr = 8, unittest_nr = 8;
+	const char *overlay_name;
 
 	/* we don't care about device state in this test */
 
 	/* apply the overlays */
 	for (i = 0; i < 2; i++) {
 
-		np = of_find_node_by_path(overlay_path(overlay_nr + i));
-		if (np == NULL) {
-			unittest(0, "could not find overlay node @\"%s\"\n",
-					overlay_path(overlay_nr + i));
-			return;
-		}
+		overlay_name = overlay_name_from_nr(overlay_nr + i);
 
-		ovcs_id = 0;
-		ret = of_overlay_apply(np, &ovcs_id);
+		ret = overlay_data_apply(overlay_name, &ovcs_id);
 		if (ret < 0)  {
-			unittest(0, "could not create overlay from \"%s\"\n",
-					overlay_path(overlay_nr + i));
+			unittest(0, "could not apply overlay \"%s\"\n",
+					overlay_name);
 			return;
 		}
 		ov_id[i] = ovcs_id;
@@ -1576,8 +1560,8 @@ static void of_unittest_overlay_8(void)
 	ovcs_id = ov_id[0];
 	ret = of_overlay_remove(&ovcs_id);
 	if (ret == 0) {
-		unittest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
-				overlay_path(overlay_nr + 0),
+		unittest(0, "%s was destroyed @\"%s\"\n",
+				overlay_name_from_nr(overlay_nr + 0),
 				unittest_path(unittest_nr,
 					PDEV_OVERLAY));
 		return;
@@ -1588,8 +1572,8 @@ static void of_unittest_overlay_8(void)
 		ovcs_id = ov_id[i];
 		ret = of_overlay_remove(&ovcs_id);
 		if (ret != 0) {
-			unittest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
-					overlay_path(overlay_nr + i),
+			unittest(0, "%s not destroyed @\"%s\"\n",
+					overlay_name_from_nr(overlay_nr + i),
 					unittest_path(unittest_nr,
 						PDEV_OVERLAY));
 			return;
@@ -1601,7 +1585,7 @@ static void of_unittest_overlay_8(void)
 }
 
 /* test insertion of a bus with parent devices */
-static void of_unittest_overlay_10(void)
+static void __init of_unittest_overlay_10(void)
 {
 	int ret;
 	char *child_path;
@@ -1890,7 +1874,7 @@ static void of_unittest_overlay_i2c_cleanup(void)
 	i2c_del_driver(&unittest_i2c_dev_driver);
 }
 
-static void of_unittest_overlay_i2c_12(void)
+static void __init of_unittest_overlay_i2c_12(void)
 {
 	int ret;
 
@@ -1903,7 +1887,7 @@ static void of_unittest_overlay_i2c_12(void)
 }
 
 /* test deactivation of device */
-static void of_unittest_overlay_i2c_13(void)
+static void __init of_unittest_overlay_i2c_13(void)
 {
 	int ret;
 
@@ -1920,7 +1904,7 @@ static void of_unittest_overlay_i2c_14(void)
 {
 }
 
-static void of_unittest_overlay_i2c_15(void)
+static void __init of_unittest_overlay_i2c_15(void)
 {
 	int ret;
 
@@ -2022,23 +2006,38 @@ static inline void __init of_unittest_overlay(void) { }
 	extern uint8_t __dtb_##name##_begin[]; \
 	extern uint8_t __dtb_##name##_end[]
 
-#define OVERLAY_INFO(name, expected) \
-{	.dtb_begin	 = __dtb_##name##_begin, \
-	.dtb_end	 = __dtb_##name##_end, \
-	.expected_result = expected, \
+#define OVERLAY_INFO(overlay_name, expected)             \
+{	.dtb_begin       = __dtb_##overlay_name##_begin, \
+	.dtb_end         = __dtb_##overlay_name##_end,   \
+	.expected_result = expected,                     \
+	.name            = #overlay_name,                \
 }
 
 struct overlay_info {
-	uint8_t		   *dtb_begin;
-	uint8_t		   *dtb_end;
-	void		   *data;
-	struct device_node *np_overlay;
-	int		   expected_result;
-	int		   overlay_id;
+	uint8_t		*dtb_begin;
+	uint8_t		*dtb_end;
+	int		expected_result;
+	int		overlay_id;
+	char		*name;
 };
 
 OVERLAY_INFO_EXTERN(overlay_base);
 OVERLAY_INFO_EXTERN(overlay);
+OVERLAY_INFO_EXTERN(overlay_0);
+OVERLAY_INFO_EXTERN(overlay_1);
+OVERLAY_INFO_EXTERN(overlay_2);
+OVERLAY_INFO_EXTERN(overlay_3);
+OVERLAY_INFO_EXTERN(overlay_4);
+OVERLAY_INFO_EXTERN(overlay_5);
+OVERLAY_INFO_EXTERN(overlay_6);
+OVERLAY_INFO_EXTERN(overlay_7);
+OVERLAY_INFO_EXTERN(overlay_8);
+OVERLAY_INFO_EXTERN(overlay_9);
+OVERLAY_INFO_EXTERN(overlay_10);
+OVERLAY_INFO_EXTERN(overlay_11);
+OVERLAY_INFO_EXTERN(overlay_12);
+OVERLAY_INFO_EXTERN(overlay_13);
+OVERLAY_INFO_EXTERN(overlay_15);
 OVERLAY_INFO_EXTERN(overlay_bad_phandle);
 OVERLAY_INFO_EXTERN(overlay_bad_symbol);
 
@@ -2046,6 +2045,21 @@ struct overlay_info {
 static struct overlay_info overlays[] = {
 	OVERLAY_INFO(overlay_base, -9999),
 	OVERLAY_INFO(overlay, 0),
+	OVERLAY_INFO(overlay_0, 0),
+	OVERLAY_INFO(overlay_1, 0),
+	OVERLAY_INFO(overlay_2, 0),
+	OVERLAY_INFO(overlay_3, 0),
+	OVERLAY_INFO(overlay_4, 0),
+	OVERLAY_INFO(overlay_5, 0),
+	OVERLAY_INFO(overlay_6, 0),
+	OVERLAY_INFO(overlay_7, 0),
+	OVERLAY_INFO(overlay_8, 0),
+	OVERLAY_INFO(overlay_9, 0),
+	OVERLAY_INFO(overlay_10, 0),
+	OVERLAY_INFO(overlay_11, 0),
+	OVERLAY_INFO(overlay_12, 0),
+	OVERLAY_INFO(overlay_13, 0),
+	OVERLAY_INFO(overlay_15, 0),
 	OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
 	OVERLAY_INFO(overlay_bad_symbol, -EINVAL),
 	{}
@@ -2071,6 +2085,7 @@ void __init unittest_unflatten_overlay_base(void)
 {
 	struct overlay_info *info;
 	u32 data_size;
+	void *new_fdt;
 	u32 size;
 
 	info = &overlays[0];
@@ -2092,22 +2107,21 @@ void __init unittest_unflatten_overlay_base(void)
 		return;
 	}
 
-	info->data = early_init_dt_alloc_memory_arch(size,
+	new_fdt = early_init_dt_alloc_memory_arch(size,
 					     roundup_pow_of_two(FDT_V17_SIZE));
-	if (!info->data) {
+	if (!new_fdt) {
 		pr_err("alloc for dtb 'overlay_base' failed");
 		return;
 	}
 
-	memcpy(info->data, info->dtb_begin, size);
+	memcpy(new_fdt, info->dtb_begin, size);
 
-	__unflatten_device_tree(info->data, NULL, &info->np_overlay,
+	__unflatten_device_tree(new_fdt, NULL, &overlay_base_root,
 				early_init_dt_alloc_memory_arch, true);
-	overlay_base_root = info->np_overlay;
 }
 
 /*
- * The purpose of of_unittest_overlay_data_add is to add an
+ * The purpose of of_unittest overlay_data_apply() is to add an
  * overlay in the normal fashion.  This is a test of the whole
  * picture, instead of testing individual elements.
  *
@@ -2117,73 +2131,44 @@ void __init unittest_unflatten_overlay_base(void)
  *
  * Return 0 on unexpected error.
  */
-static int __init overlay_data_add(int onum)
+static int __init overlay_data_apply(const char *overlay_name, int *overlay_id)
 {
 	struct overlay_info *info;
+	int found = 0;
 	int k;
 	int ret;
 	u32 size;
-	u32 size_from_header;
 
-	for (k = 0, info = overlays; info; info++, k++) {
-		if (k == onum)
+	for (k = 0, info = overlays; info && info->name; info++, k++) {
+		if (!strcmp(overlay_name, info->name)) {
+			found = 1;
 			break;
+		}
 	}
-	if (onum > k)
+	if (!found) {
+		pr_err("no overlay data for %s\n", overlay_name);
 		return 0;
+	}
 
 	size = info->dtb_end - info->dtb_begin;
 	if (!size) {
-		pr_err("no overlay to attach, %d\n", onum);
+		pr_err("no overlay data for %s\n", overlay_name);
 		ret = 0;
 	}
 
-	size_from_header = fdt_totalsize(info->dtb_begin);
-	if (size_from_header != size) {
-		pr_err("overlay header totalsize != actual size, %d", onum);
-		return 0;
-	}
-
-	/*
-	 * Must create permanent copy of FDT because of_fdt_unflatten_tree()
-	 * will create pointers to the passed in FDT in the EDT.
-	 */
-	info->data = kmemdup(info->dtb_begin, size, GFP_KERNEL);
-	if (!info->data) {
-		pr_err("unable to allocate memory for data, %d\n", onum);
-		return 0;
-	}
-
-	of_fdt_unflatten_tree(info->data, NULL, &info->np_overlay);
-	if (!info->np_overlay) {
-		pr_err("unable to unflatten overlay, %d\n", onum);
-		ret = 0;
-		goto out_free_data;
-	}
-
-	info->overlay_id = 0;
-	ret = of_overlay_apply(info->np_overlay, &info->overlay_id);
-	if (ret < 0) {
-		pr_err("of_overlay_apply() (ret=%d), %d\n", ret, onum);
-		goto out_free_np_overlay;
-	}
-
-	pr_debug("__dtb_overlay_begin applied, overlay id %d\n", ret);
-
-	goto out;
-
-out_free_np_overlay:
-	/*
-	 * info->np_overlay is the unflattened device tree
-	 * It has not been spliced into the live tree.
-	 */
-
-	/* todo: function to free unflattened device tree */
+	ret = of_overlay_fdt_apply(info->dtb_begin, &info->overlay_id);
+	if (overlay_id)
+		*overlay_id = info->overlay_id;
+	if (ret < 0)
+		goto out;
 
-out_free_data:
-	kfree(info->data);
+	pr_debug("%s applied\n", overlay_name);
 
 out:
+	if (ret != info->expected_result)
+		pr_err("of_overlay_fdt_apply() expected %d, ret=%d, %s\n",
+		       info->expected_result, ret, overlay_name);
+
 	return (ret == info->expected_result);
 }
 
@@ -2285,18 +2270,29 @@ static __init void of_unittest_overlay_high_level(void)
 		__of_attach_node_sysfs(np);
 
 	if (of_symbols) {
+		struct property *new_prop;
 		for_each_property_of_node(overlay_base_symbols, prop) {
-			ret = __of_add_property(of_symbols, prop);
+
+			new_prop = __of_prop_dup(prop, GFP_KERNEL);
+			if (!new_prop) {
+				unittest(0, "__of_prop_dup() of '%s' from overlay_base node __symbols__",
+					 prop->name);
+				goto err_unlock;
+			}
+			ret = __of_add_property(of_symbols, new_prop);
 			if (ret) {
-				unittest(0,
-					 "duplicate property '%s' in overlay_base node __symbols__",
+				if (!strcmp(new_prop->name, "name")) {
+					/* auto-generated by unflatten */
+					ret = 0;
+					continue;
+				}
+				unittest(0, "duplicate property '%s' in overlay_base node __symbols__",
 					 prop->name);
 				goto err_unlock;
 			}
-			ret = __of_add_property_sysfs(of_symbols, prop);
+			ret = __of_add_property_sysfs(of_symbols, new_prop);
 			if (ret) {
-				unittest(0,
-					 "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
+				unittest(0, "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
 					 prop->name);
 				goto err_unlock;
 			}
@@ -2308,13 +2304,13 @@ static __init void of_unittest_overlay_high_level(void)
 
 	/* now do the normal overlay usage test */
 
-	unittest(overlay_data_add(1),
+	unittest(overlay_data_apply("overlay", NULL),
 		 "Adding overlay 'overlay' failed\n");
 
-	unittest(overlay_data_add(2),
+	unittest(overlay_data_apply("overlay_bad_phandle", NULL),
 		 "Adding overlay 'overlay_bad_phandle' failed\n");
 
-	unittest(overlay_data_add(3),
+	unittest(overlay_data_apply("overlay_bad_symbol", NULL),
 		 "Adding overlay 'overlay_bad_symbol' failed\n");
 
 	return;
diff --git a/include/linux/of.h b/include/linux/of.h
index d3dea1d1e3a9..1ce26c65b50b 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1356,8 +1356,6 @@ 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_remove(int *ovcs_id);
 int of_overlay_remove_all(void);
 
@@ -1366,11 +1364,6 @@ struct of_overlay_notify_data {
 
 #else
 
-static inline int of_overlay_apply(struct device_node *tree, int *ovcs_id)
-{
-	return -ENOTSUPP;
-}
-
 static inline int of_overlay_remove(int *ovcs_id)
 {
 	return -ENOTSUPP;
-- 
Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

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[PATCH 2/2] of: convert unittest overlay devicetree source to sugar syntax

[frowand.list-Re5JQEeQqe8AvxtiuMwx3w]

From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

The unittest-data overlays have been pulled into proper overlay
devicetree source files without changing their format.  The
next step is to convert them to use sugar syntax instead of
hand coding overlay fragments structure.

A few of the overlays can not be converted because they test
absolute target paths in the overlay fragment.  dtc does not
generate this type of target:
  overlay_0.dts
  overlay_1.dts
  overlay_12.dts
  overlay_13.dts

Two pre-existing unittest overlay devicetree source files are
also converted:
  overlay_bad_phandle.dts
  overlay_bad_symbol.dts

Signed-off-by: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
---
There are checkpatch warnings.  I have reviewed them and feel they
can be ignored.  They are pre-existing warnings of un-documented
bindings of made up (fake) compatibles in devicetree source for
test overlays.

 drivers/of/unittest-data/overlay.dts             | 101 ++++++++++-------------
 drivers/of/unittest-data/overlay_10.dts          |  39 ++++-----
 drivers/of/unittest-data/overlay_11.dts          |  40 ++++-----
 drivers/of/unittest-data/overlay_15.dts          |  41 ++++-----
 drivers/of/unittest-data/overlay_2.dts           |  11 +--
 drivers/of/unittest-data/overlay_3.dts           |  11 +--
 drivers/of/unittest-data/overlay_4.dts           |  23 ++----
 drivers/of/unittest-data/overlay_5.dts           |  11 +--
 drivers/of/unittest-data/overlay_6.dts           |  13 +--
 drivers/of/unittest-data/overlay_7.dts           |  13 +--
 drivers/of/unittest-data/overlay_8.dts           |  13 +--
 drivers/of/unittest-data/overlay_9.dts           |  13 +--
 drivers/of/unittest-data/overlay_bad_phandle.dts |  23 ++----
 drivers/of/unittest-data/overlay_bad_symbol.dts  |  27 +++---
 drivers/of/unittest-data/tests-overlay.dtsi      |   4 +-
 15 files changed, 149 insertions(+), 234 deletions(-)

diff --git a/drivers/of/unittest-data/overlay.dts b/drivers/of/unittest-data/overlay.dts
index ab5e89b5e27e..3bbc59e922fe 100644
--- a/drivers/of/unittest-data/overlay.dts
+++ b/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 >;
 };
diff --git a/drivers/of/unittest-data/overlay_10.dts b/drivers/of/unittest-data/overlay_10.dts
index 445925a10cd3..73993bf23bf8 100644
--- a/drivers/of/unittest-data/overlay_10.dts
+++ b/drivers/of/unittest-data/overlay_10.dts
@@ -2,33 +2,26 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_10 */
-	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+/* overlay_10 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus";
-		__overlay__ {
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
 
-			/* suppress DTC warning */
-			#address-cells = <1>;
-			#size-cells = <0>;
+	test-unittest10 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <10>;
 
-			test-unittest10 {
-				compatible = "unittest";
-				status = "okay";
-				reg = <10>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				test-unittest101 {
-					compatible = "unittest";
-					status = "okay";
-					reg = <1>;
-				};
-
-			};
+		test-unittest101 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
 		};
 	};
 };
diff --git a/drivers/of/unittest-data/overlay_11.dts b/drivers/of/unittest-data/overlay_11.dts
index c1d14f34359e..9a79b253a809 100644
--- a/drivers/of/unittest-data/overlay_11.dts
+++ b/drivers/of/unittest-data/overlay_11.dts
@@ -2,33 +2,27 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_11 */
-	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+/* overlay_11 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus";
-		__overlay__ {
+&unittest_test_bus {
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
 
-			/* suppress DTC warning */
-			#address-cells = <1>;
-			#size-cells = <0>;
+	test-unittest11 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <11>;
 
-			test-unittest11 {
-				compatible = "unittest";
-				status = "okay";
-				reg = <11>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
-				#address-cells = <1>;
-				#size-cells = <0>;
-
-				test-unittest111 {
-					compatible = "unittest";
-					status = "okay";
-					reg = <1>;
-				};
-
-			};
+		test-unittest111 {
+			compatible = "unittest";
+			status = "okay";
+			reg = <1>;
 		};
+
 	};
 };
diff --git a/drivers/of/unittest-data/overlay_15.dts b/drivers/of/unittest-data/overlay_15.dts
index 44e44c62b739..b98f2514df4b 100644
--- a/drivers/of/unittest-data/overlay_15.dts
+++ b/drivers/of/unittest-data/overlay_15.dts
@@ -2,33 +2,28 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_15 - mux overlay */
+/* overlay_15 - mux overlay */
 
-	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";
+&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>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 
-				i2c@0 {
-					#address-cells = <1>;
-					#size-cells = <0>;
-					reg = <0>;
+		i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
 
-					test-mux-dev {
-						reg = <32>;
-						compatible = "unittest-i2c-dev";
-						status = "okay";
-					};
-				};
+			test-mux-dev {
+				reg = <32>;
+				compatible = "unittest-i2c-dev";
+				status = "okay";
 			};
 		};
 	};
diff --git a/drivers/of/unittest-data/overlay_2.dts b/drivers/of/unittest-data/overlay_2.dts
index cf1e4245b7ce..db8684ba89d9 100644
--- a/drivers/of/unittest-data/overlay_2.dts
+++ b/drivers/of/unittest-data/overlay_2.dts
@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_2 -  enable using label */
+/* overlay_2 -  enable using label */
 
-	fragment@0 {
-		target = <&unittest2>;
-		__overlay__ {
-			status = "okay";
-		};
-	};
+&unittest2 {
+	status = "okay";
 };
diff --git a/drivers/of/unittest-data/overlay_3.dts b/drivers/of/unittest-data/overlay_3.dts
index 158dc44fc20a..40f289e7c237 100644
--- a/drivers/of/unittest-data/overlay_3.dts
+++ b/drivers/of/unittest-data/overlay_3.dts
@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_3 - disable using label */
+/* overlay_3 - disable using label */
 
-	fragment@0 {
-		target = <&unittest3>;
-		__overlay__ {
-			status = "disabled";
-		};
-	};
+&unittest3 {
+	status = "disabled";
 };
diff --git a/drivers/of/unittest-data/overlay_4.dts b/drivers/of/unittest-data/overlay_4.dts
index b4a2e6c6b016..a8a77ddf9abe 100644
--- a/drivers/of/unittest-data/overlay_4.dts
+++ b/drivers/of/unittest-data/overlay_4.dts
@@ -2,22 +2,17 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_4 - test insertion of a full node */
+/* overlay_4 - test insertion of a full node */
 
-	fragment@0 {
-		target = <&unittestbus>;
-		__overlay__ {
+&unittest_test_bus {
 
-			/* suppress DTC warning */
-			#address-cells = <1>;
-			#size-cells = <0>;
+	/* suppress DTC warning */
+	#address-cells = <1>;
+	#size-cells = <0>;
 
-			test-unittest4 {
-				compatible = "unittest";
-				status = "okay";
-				reg = <4>;
-			};
-		};
+	test-unittest4 {
+		compatible = "unittest";
+		status = "okay";
+		reg = <4>;
 	};
 };
diff --git a/drivers/of/unittest-data/overlay_5.dts b/drivers/of/unittest-data/overlay_5.dts
index 02ad25c1f19c..706f5f1b737c 100644
--- a/drivers/of/unittest-data/overlay_5.dts
+++ b/drivers/of/unittest-data/overlay_5.dts
@@ -2,13 +2,8 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_5 - test overlay apply revert */
+/* overlay_5 - test overlay apply revert */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest5";
-		__overlay__ {
-			status = "okay";
-		};
-	};
+&unittest5 {
+	status = "okay";
 };
diff --git a/drivers/of/unittest-data/overlay_6.dts b/drivers/of/unittest-data/overlay_6.dts
index a14e965f5497..21a7fa4ca45e 100644
--- a/drivers/of/unittest-data/overlay_6.dts
+++ b/drivers/of/unittest-data/overlay_6.dts
@@ -2,14 +2,9 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_6 */
-	/* overlays 6, 7 application and removal in sequence */
+/* overlay_6 */
+/* overlays 6, 7 application and removal in sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest6";
-		__overlay__ {
-			status = "okay";
-		};
-	};
+&unittest6 {
+	status = "okay";
 };
diff --git a/drivers/of/unittest-data/overlay_7.dts b/drivers/of/unittest-data/overlay_7.dts
index 4bd7e423209c..58ba1bb51b50 100644
--- a/drivers/of/unittest-data/overlay_7.dts
+++ b/drivers/of/unittest-data/overlay_7.dts
@@ -2,14 +2,9 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_7 */
-	/* overlays 6, 7 application and removal in sequence */
+/* overlay_7 */
+/* overlays 6, 7 application and removal in sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest7";
-		__overlay__ {
-			status = "okay";
-		};
-	};
+&unittest7 {
+	status = "okay";
 };
diff --git a/drivers/of/unittest-data/overlay_8.dts b/drivers/of/unittest-data/overlay_8.dts
index 5b21c53945a9..e9718d118e38 100644
--- a/drivers/of/unittest-data/overlay_8.dts
+++ b/drivers/of/unittest-data/overlay_8.dts
@@ -2,14 +2,9 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_8 */
-	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+/* overlay_8 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
-		__overlay__ {
-			status = "okay";
-		};
-	};
+&unittest8 {
+	status = "okay";
 };
diff --git a/drivers/of/unittest-data/overlay_9.dts b/drivers/of/unittest-data/overlay_9.dts
index 20ff055a5349..b35e23edae50 100644
--- a/drivers/of/unittest-data/overlay_9.dts
+++ b/drivers/of/unittest-data/overlay_9.dts
@@ -2,14 +2,9 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-	/* overlay_9 */
-	/* overlays 8, 9, 10, 11 application and removal in bad sequence */
+/* overlay_9 */
+/* overlays 8, 9, 10, 11 application and removal in bad sequence */
 
-	fragment@0 {
-		target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
-		__overlay__ {
-			property-foo = "bar";
-		};
-	};
+&unittest8 {
+	property-foo = "bar";
 };
diff --git a/drivers/of/unittest-data/overlay_bad_phandle.dts b/drivers/of/unittest-data/overlay_bad_phandle.dts
index 4d5b99723bad..83b797360318 100644
--- a/drivers/of/unittest-data/overlay_bad_phandle.dts
+++ b/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 >;
 	};
 };
diff --git a/drivers/of/unittest-data/overlay_bad_symbol.dts b/drivers/of/unittest-data/overlay_bad_symbol.dts
index 09261cb9a67e..3b3a2c08edd7 100644
--- a/drivers/of/unittest-data/overlay_bad_symbol.dts
+++ b/drivers/of/unittest-data/overlay_bad_symbol.dts
@@ -1,22 +1,15 @@
 /dts-v1/;
 /plugin/;
 
-/ {
-
-	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 >;
-			};
-
-		};
+&electric_1 {
+
+	// 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 >;
 	};
+
 };
diff --git a/drivers/of/unittest-data/tests-overlay.dtsi b/drivers/of/unittest-data/tests-overlay.dtsi
index fa2fb43bccac..25cf397b8f6b 100644
--- a/drivers/of/unittest-data/tests-overlay.dtsi
+++ b/drivers/of/unittest-data/tests-overlay.dtsi
@@ -5,7 +5,7 @@
 		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 @@
 					reg = <8>;
 				};
 
-				i2c-test-bus {
+				unittest_i2c_test_bus: i2c-test-bus {
 					compatible = "unittest-i2c-bus";
 					status = "okay";
 					reg = <50>;
-- 
Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>

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Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Masahiro Yamada]

Hi Frank,

2018-01-29 11:53 GMT+09:00  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
> diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
> index df697976740a..2b7ee68c908e 100644
> --- a/drivers/of/unittest-data/Makefile
> +++ b/drivers/of/unittest-data/Makefile
> @@ -3,6 +3,21 @@ 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
> @@ -14,6 +29,7 @@ DTC_FLAGS_overlay := -@
>  DTC_FLAGS_overlay_bad_phandle := -@
>  DTC_FLAGS_overlay_bad_symbol := -@
>  DTC_FLAGS_overlay_base := -@
> +DTC_FLAGS_testcases := -@
>

This overwrites '-Wno-interrupts_property' a few lines above.

Perhaps, do you want to do like this?

     DTC_FLAGS_testcases += -@

or

     DTC_FLAGS_testcases := -Wno-interrupts_property -@





-- 
Best Regards
Masahiro Yamada
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Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Frank Rowand]

On 01/28/18 19:21, Masahiro Yamada wrote:
> Hi Frank,
> 
> 2018-01-29 11:53 GMT+09:00  <frowand.list@gmail.com>:
>> From: Frank Rowand <frank.rowand@sony.com>
>> diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
>> index df697976740a..2b7ee68c908e 100644
>> --- a/drivers/of/unittest-data/Makefile
>> +++ b/drivers/of/unittest-data/Makefile
>> @@ -3,6 +3,21 @@ 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
>> @@ -14,6 +29,7 @@ DTC_FLAGS_overlay := -@
>>  DTC_FLAGS_overlay_bad_phandle := -@
>>  DTC_FLAGS_overlay_bad_symbol := -@
>>  DTC_FLAGS_overlay_base := -@
>> +DTC_FLAGS_testcases := -@
>>
> 
> This overwrites '-Wno-interrupts_property' a few lines above.
> 
> Perhaps, do you want to do like this?
> 
>      DTC_FLAGS_testcases += -@
> 
> or
> 
>      DTC_FLAGS_testcases := -Wno-interrupts_property -@

Yes, thanks for catching that!  I'll fix it.

-Frank

Re: [PATCH 2/2] of: convert unittest overlay devicetree source to sugar syntax

[Geert Uytterhoeven]

Hi Frank,

On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list@gmail.com> wrote:
> From: Frank Rowand <frank.rowand@sony.com>
>
> The unittest-data overlays have been pulled into proper overlay
> devicetree source files without changing their format.  The
> next step is to convert them to use sugar syntax instead of
> hand coding overlay fragments structure.

Cool! I had heard about the new syntax, but hadn't realized it was merged in
v4.15-rc1.

Have you used your overlay_convert_old_to_new script to convert them?

> A few of the overlays can not be converted because they test
> absolute target paths in the overlay fragment.  dtc does not
> generate this type of target:
>   overlay_0.dts
>   overlay_1.dts
>   overlay_12.dts
>   overlay_13.dts

And I guess you want to keep at least a few tests using the non-sugar syntax
anyway?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

[Geert Uytterhoeven]

Hi Frank,

On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list@gmail.com> wrote:
> From: Frank Rowand <frank.rowand@sony.com>
>
> 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().
>
> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
> code, which is thus responsible for freeing the duplicate FDT.  The
> caller of of_overlay_fdt_apply() remains responsible for freeing the
> original FDT.
>
> The unflattened device tree (aka expanded device tree, EDT) now
> belongs to devicetree code, which is thus responsible for freeing
> the EDT.
>
> These ownership changes prevent early freeing of the duplicated FDT
> or the EDT, which could result in use after free errors.
>
> These changes led to migrating some unittest overlay data into
> their own devicetree source files, and then converting most of
> them to use sugar syntax instead of hand coding fragments.

Thanks for your series!

> Frank Rowand (2):
>   of: change overlay apply input data from EDT to FDT
>   of: convert unittest overlay devicetree source to sugar syntax

Do you plan to update Documentation/devicetree/overlay-notes.txt
and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Rob Herring]

On Sun, Jan 28, 2018 at 8:53 PM,  <frowand.list@gmail.com> wrote:
> From: Frank Rowand <frank.rowand@sony.com>
>
> 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().
>
> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
> code, which is thus responsible for freeing the duplicate FDT.  The
> caller of of_overlay_fdt_apply() remains responsible for freeing the
> original FDT.
>
> The unflattened device tree (aka expanded device tree, EDT) now

Not really a fan of a new acronym.

> belongs to devicetree code, which is thus responsible for freeing
> the EDT.
>
> These ownership changes prevent early freeing of the duplicated FDT
> or the EDT, which could result in use after free errors.
>
> of_overlay_fdt_apply() is a private function for the anticipated
> overlay loader.
>
> Update unittest.c to use of_overlay_fdt_apply() instead of
> of_overlay_apply().
>
> Move overlay fragments from artificial locations in
> drivers/of/unittest-data/tests-overlay.dtsi into one devicetree
> source file per overlay.  This led to changes in
> drivers/of/unitest-data/Makefile and drivers/of/unitest.c.

Why the rearranging? That should be a separate patch.

>
>   - Add overlay directives to the overlay devicetree source files so
>     that dtc will compile them as true overlays into one FDT data
>     chunk per overlay.

For this?

>   - Set CFLAGS for drivers/of/unittest-data/testcases.dts so that
>     symbols will be generated for overlay resolution of overlays
>     that are no longer artificially contained in testcases.dts
>
>   - Unflatten and apply each unittest overlay FDT using
>     of_overlay_fdt_apply().
>
>   - Enable the of_resolve_phandles() check for whether the overlay
>     EDT is detached.  This check was previously disabled because the
>     overlays from tests-overlay.dtsi were not unflattened into detached
>     trees.
>
>   - Other changes to unittest.c infrastructure to manage multiple test
>     FDTs built into the kernel image (access by name instead of
>     arbitrary number).
>
>   - of_unittest_overlay_high_level(): previously unused code to add
>     properties from the overlay_base devicetree to the live tree
>     was triggered by the restructuring of tests-overlay.dtsi and thus
>     testcases.dts.  This exposed two bugs: (1) the need to dup a
>     property before adding it, and (2) property 'name' is
>     auto-generated in the unflatten code and thus will be a duplicate
>     in the __symbols__ node - do not treat this duplicate as an error.
>
> Errors while developing the patch exposed inadequate error messages
> to debug problems when overlay devicetree fragment nodes contain
> an invalid target path.  Improved the messages in find_target_node().

Sounds like another separate patch.

Rob

Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Geert Uytterhoeven]

On Mon, Jan 29, 2018 at 3:42 PM, Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> On Sun, Jan 28, 2018 at 8:53 PM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
>>
>> 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().
>>
>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>> code, which is thus responsible for freeing the duplicate FDT.  The
>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>> original FDT.
>>
>> The unflattened device tree (aka expanded device tree, EDT) now
>
> Not really a fan of a new acronym.

FWIW, it has already sneaked in:

$ git grep -w EDT -- drivers/of
drivers/of/unittest.c:   * will create pointers to the passed in FDT in the EDT.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Frank Rowand]

On 01/29/18 06:42, Rob Herring wrote:
> On Sun, Jan 28, 2018 at 8:53 PM,  <frowand.list@gmail.com> wrote:
>> From: Frank Rowand <frank.rowand@sony.com>
>>
>> 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().
>>
>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>> code, which is thus responsible for freeing the duplicate FDT.  The
>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>> original FDT.
>>
>> The unflattened device tree (aka expanded device tree, EDT) now
> 
> Not really a fan of a new acronym.
> 
>> belongs to devicetree code, which is thus responsible for freeing
>> the EDT.
>>
>> These ownership changes prevent early freeing of the duplicated FDT
>> or the EDT, which could result in use after free errors.
>>
>> of_overlay_fdt_apply() is a private function for the anticipated
>> overlay loader.
>>
>> Update unittest.c to use of_overlay_fdt_apply() instead of
>> of_overlay_apply().
>>
>> Move overlay fragments from artificial locations in
>> drivers/of/unittest-data/tests-overlay.dtsi into one devicetree
>> source file per overlay.  This led to changes in
>> drivers/of/unitest-data/Makefile and drivers/of/unitest.c.

I should have reversed the cause and effect in that sentence to
instead be:

  The changes to drivers/of/unittest.c require the test overlays
  to be in FDT form instead of unflattened devicetree form.  Move
  overlay fragments from artificial locations in
  drivers/of/unittest-data/tests-overlay.dtsi into one
  devicetree source file per overlay and thus create
  one FDT per overlay.


> Why the rearranging? That should be a separate patch.
Bisectability.

I can make the changes to the devicetree files in a second patch.
After the first patch, there will be 29 self test fails.

I will make the change unless you respond back to this saying not to.


>>   - Add overlay directives to the overlay devicetree source files so
>>     that dtc will compile them as true overlays into one FDT data
>>     chunk per overlay.
> 
> For this?
> 
>>   - Set CFLAGS for drivers/of/unittest-data/testcases.dts so that
>>     symbols will be generated for overlay resolution of overlays
>>     that are no longer artificially contained in testcases.dts
>>
>>   - Unflatten and apply each unittest overlay FDT using
>>     of_overlay_fdt_apply().
>>
>>   - Enable the of_resolve_phandles() check for whether the overlay
>>     EDT is detached.  This check was previously disabled because the
>>     overlays from tests-overlay.dtsi were not unflattened into detached
>>     trees.
>>
>>   - Other changes to unittest.c infrastructure to manage multiple test
>>     FDTs built into the kernel image (access by name instead of
>>     arbitrary number).
>>
>>   - of_unittest_overlay_high_level(): previously unused code to add
>>     properties from the overlay_base devicetree to the live tree
>>     was triggered by the restructuring of tests-overlay.dtsi and thus
>>     testcases.dts.  This exposed two bugs: (1) the need to dup a
>>     property before adding it, and (2) property 'name' is
>>     auto-generated in the unflatten code and thus will be a duplicate
>>     in the __symbols__ node - do not treat this duplicate as an error.
>>
>> Errors while developing the patch exposed inadequate error messages
>> to debug problems when overlay devicetree fragment nodes contain
>> an invalid target path.  Improved the messages in find_target_node().
> 
> Sounds like another separate patch.

Will do.


> 
> Rob
> 

Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Frank Rowand]

On 01/29/18 07:05, Geert Uytterhoeven wrote:
> On Mon, Jan 29, 2018 at 3:42 PM, Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>> On Sun, Jan 28, 2018 at 8:53 PM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
>>>
>>> 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().
>>>
>>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>>> code, which is thus responsible for freeing the duplicate FDT.  The
>>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>>> original FDT.
>>>
>>> The unflattened device tree (aka expanded device tree, EDT) now
>>
>> Not really a fan of a new acronym.
> 
> FWIW, it has already sneaked in:
> 
> $ git grep -w EDT -- drivers/of
> drivers/of/unittest.c:   * will create pointers to the passed in FDT in the EDT.

Rob will be glad to know that this comment is removed by this patch series.

:-)


> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 

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Re: [PATCH 2/2] of: convert unittest overlay devicetree source to sugar syntax

[Frank Rowand]

On 01/29/18 02:37, Geert Uytterhoeven wrote:
> Hi Frank,
> 
> On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
>>
>> The unittest-data overlays have been pulled into proper overlay
>> devicetree source files without changing their format.  The
>> next step is to convert them to use sugar syntax instead of
>> hand coding overlay fragments structure.
> 
> Cool! I had heard about the new syntax, but hadn't realized it was merged in
> v4.15-rc1.
> 
> Have you used your overlay_convert_old_to_new script to convert them?
> 
>> A few of the overlays can not be converted because they test
>> absolute target paths in the overlay fragment.  dtc does not
>> generate this type of target:
>>   overlay_0.dts
>>   overlay_1.dts
>>   overlay_12.dts
>>   overlay_13.dts
> 
> And I guess you want to keep at least a few tests using the non-sugar syntax
> anyway?

Not really.  But not something I care about at the moment.


> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 

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Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

[Frank Rowand]

On 01/29/18 06:08, Geert Uytterhoeven wrote:
> Hi Frank,
> 
> On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list@gmail.com> wrote:
>> From: Frank Rowand <frank.rowand@sony.com>
>>
>> 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().
>>
>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>> code, which is thus responsible for freeing the duplicate FDT.  The
>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>> original FDT.
>>
>> The unflattened device tree (aka expanded device tree, EDT) now
>> belongs to devicetree code, which is thus responsible for freeing
>> the EDT.
>>
>> These ownership changes prevent early freeing of the duplicated FDT
>> or the EDT, which could result in use after free errors.
>>
>> These changes led to migrating some unittest overlay data into
>> their own devicetree source files, and then converting most of
>> them to use sugar syntax instead of hand coding fragments.
> 
> Thanks for your series!
> 
>> Frank Rowand (2):
>>   of: change overlay apply input data from EDT to FDT
>>   of: convert unittest overlay devicetree source to sugar syntax
> 
> Do you plan to update Documentation/devicetree/overlay-notes.txt
> and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?

Thanks for the pointers.

I will add updates to Documentation/devicetree/overlay-notes.txt in
this series.

The changes to Documentation/devicetree/bindings/fpga/fpga-region.txt
are related to the relatively new sugar syntax in dtc, not to the
changes introduced by this patch series.  I'll create a patch outside
this series to update this documentation.


> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 

Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

[Frank Rowand]

Hi Alan,

In this patch series one of the changes was to change some
devicetree unittest overlay source to use the new sugar syntax to
specify overlay nodes instead of hand coding the fragment nodes.

One reviewer reminded me to update Documentation/ files that
show the hand coding of overlay fragment nodes.  One of those
files is Documentation/devicetree/bindings/fpga/fpga-region.txt.
I plan to submit a patch to update the example devicetree source
to use the sugar syntax.  There is one place where I can not
make that change, which is the "Overlay DTS Format" section.
In this section, the use of 'target-path="/path" is shown as
one of two ways to specify the target of the fragment.  The
sugar syntax creates a fragment using the 'target=<phandle>'
form instead of 'target-path="/path"' form.  With sugar
syntax, there is no way to specify target-path.  Is the
target-path form needed by the fpga subsystem, or can this
be removed?

-Frank

On 01/29/18 16:22, Frank Rowand wrote:
> On 01/29/18 06:08, Geert Uytterhoeven wrote:
>> Hi Frank,
>>
>> On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
>>>
>>> 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().
>>>
>>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>>> code, which is thus responsible for freeing the duplicate FDT.  The
>>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>>> original FDT.
>>>
>>> The unflattened device tree (aka expanded device tree, EDT) now
>>> belongs to devicetree code, which is thus responsible for freeing
>>> the EDT.
>>>
>>> These ownership changes prevent early freeing of the duplicated FDT
>>> or the EDT, which could result in use after free errors.
>>>
>>> These changes led to migrating some unittest overlay data into
>>> their own devicetree source files, and then converting most of
>>> them to use sugar syntax instead of hand coding fragments.
>>
>> Thanks for your series!
>>
>>> Frank Rowand (2):
>>>   of: change overlay apply input data from EDT to FDT
>>>   of: convert unittest overlay devicetree source to sugar syntax
>>
>> Do you plan to update Documentation/devicetree/overlay-notes.txt
>> and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?
> 
> Thanks for the pointers.
> 
> I will add updates to Documentation/devicetree/overlay-notes.txt in
> this series.
> 
> The changes to Documentation/devicetree/bindings/fpga/fpga-region.txt
> are related to the relatively new sugar syntax in dtc, not to the
> changes introduced by this patch series.  I'll create a patch outside
> this series to update this documentation.
> 
> 
>> Gr{oetje,eeting}s,
>>
>>                         Geert
>>
>> --
>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
>>
>> In personal conversations with technical people, I call myself a hacker. But
>> when I'm talking to journalists I just say "programmer" or something like that.
>>                                 -- Linus Torvalds
>>
> 
> 

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Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

[Alan Tull]

On Mon, Jan 29, 2018 at 6:35 PM, Frank Rowand <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

Hi Frank,

> Hi Alan,
>
> In this patch series one of the changes was to change some
> devicetree unittest overlay source to use the new sugar syntax to
> specify overlay nodes instead of hand coding the fragment nodes.
>
> One reviewer reminded me to update Documentation/ files that
> show the hand coding of overlay fragment nodes.  One of those
> files is Documentation/devicetree/bindings/fpga/fpga-region.txt.
> I plan to submit a patch to update the example devicetree source
> to use the sugar syntax.  There is one place where I can not
> make that change, which is the "Overlay DTS Format" section.
> In this section, the use of 'target-path="/path" is shown as
> one of two ways to specify the target of the fragment.  The
> sugar syntax creates a fragment using the 'target=<phandle>'
> form instead of 'target-path="/path"' form.  With sugar
> syntax, there is no way to specify target-path.  Is the
> target-path form needed by the fpga subsystem, or can this
> be removed?

Removing target-path won't be a loss of functionality as far as I can see.

Currently the examples in
Documentation/devicetree/bindings/fpga/fpga-region.txt all specify
'target = <phandle> while the descriptive text says that target and
target-path are both options (3 line edits are needed to remove
target-path from this file plus other edits to change it to sugar
format without __overlay__ and 'fragment@0').

Thanks for asking!

Alan

>
> -Frank
>
> On 01/29/18 16:22, Frank Rowand wrote:
>> On 01/29/18 06:08, Geert Uytterhoeven wrote:
>>> Hi Frank,
>>>
>>> On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>>> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
>>>>
>>>> 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().
>>>>
>>>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>>>> code, which is thus responsible for freeing the duplicate FDT.  The
>>>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>>>> original FDT.
>>>>
>>>> The unflattened device tree (aka expanded device tree, EDT) now
>>>> belongs to devicetree code, which is thus responsible for freeing
>>>> the EDT.
>>>>
>>>> These ownership changes prevent early freeing of the duplicated FDT
>>>> or the EDT, which could result in use after free errors.
>>>>
>>>> These changes led to migrating some unittest overlay data into
>>>> their own devicetree source files, and then converting most of
>>>> them to use sugar syntax instead of hand coding fragments.
>>>
>>> Thanks for your series!
>>>
>>>> Frank Rowand (2):
>>>>   of: change overlay apply input data from EDT to FDT
>>>>   of: convert unittest overlay devicetree source to sugar syntax
>>>
>>> Do you plan to update Documentation/devicetree/overlay-notes.txt
>>> and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?
>>
>> Thanks for the pointers.
>>
>> I will add updates to Documentation/devicetree/overlay-notes.txt in
>> this series.
>>
>> The changes to Documentation/devicetree/bindings/fpga/fpga-region.txt
>> are related to the relatively new sugar syntax in dtc, not to the
>> changes introduced by this patch series.  I'll create a patch outside
>> this series to update this documentation.
>>
>>
>>> Gr{oetje,eeting}s,
>>>
>>>                         Geert
>>>
>>> --
>>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org
>>>
>>> In personal conversations with technical people, I call myself a hacker. But
>>> when I'm talking to journalists I just say "programmer" or something like that.
>>>                                 -- Linus Torvalds
>>>
>>
>>
>
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Re: [PATCH 1/2] of: change overlay apply input data from EDT to FDT

[Rob Herring]

On Mon, Jan 29, 2018 at 04:01:38PM -0800, Frank Rowand wrote:
> On 01/29/18 06:42, Rob Herring wrote:
> > On Sun, Jan 28, 2018 at 8:53 PM,  <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >> From: Frank Rowand <frank.rowand-7U/KSKJipcs@public.gmane.org>
> >>
> >> 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().
> >>
> >> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
> >> code, which is thus responsible for freeing the duplicate FDT.  The
> >> caller of of_overlay_fdt_apply() remains responsible for freeing the
> >> original FDT.
> >>
> >> The unflattened device tree (aka expanded device tree, EDT) now
> > 
> > Not really a fan of a new acronym.
> > 
> >> belongs to devicetree code, which is thus responsible for freeing
> >> the EDT.
> >>
> >> These ownership changes prevent early freeing of the duplicated FDT
> >> or the EDT, which could result in use after free errors.
> >>
> >> of_overlay_fdt_apply() is a private function for the anticipated
> >> overlay loader.
> >>
> >> Update unittest.c to use of_overlay_fdt_apply() instead of
> >> of_overlay_apply().
> >>
> >> Move overlay fragments from artificial locations in
> >> drivers/of/unittest-data/tests-overlay.dtsi into one devicetree
> >> source file per overlay.  This led to changes in
> >> drivers/of/unitest-data/Makefile and drivers/of/unitest.c.
> 
> I should have reversed the cause and effect in that sentence to
> instead be:
> 
>   The changes to drivers/of/unittest.c require the test overlays
>   to be in FDT form instead of unflattened devicetree form.  Move
>   overlay fragments from artificial locations in
>   drivers/of/unittest-data/tests-overlay.dtsi into one
>   devicetree source file per overlay and thus create
>   one FDT per overlay.
> 
> 
> > Why the rearranging? That should be a separate patch.
> Bisectability.
> 
> I can make the changes to the devicetree files in a second patch.
> After the first patch, there will be 29 self test fails.
> 
> I will make the change unless you respond back to this saying not to.

One patch is fine for me. Unit test is special.

Rob
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