Devicetree changes for v4.1

devicetree changes queued up for v4.1. Here are the highlights:
 - Lots of unittest cleanup from Frank Rowand
 - Bugfixes and updates to the of_graph code
 - Tighten up of_get_mac_address() code
 - Documentation updates
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJVMYiQAAoJEMWQL496c2LNyrcP/2acOKeyHk7zBVWxaYe6nO52
 iwpDb+UDEdW+1Cx5e+OpF1gqoY7lJ2Q+Uvm65+z00a46Fnl0cWuSYFIV7e0wjE5/
 3EAB4cQgiCzToDnbtCu4U6XlpNlQz/q85tV9X/EpYApHNb+BKN6RMzyIDm48lzJY
 L6SG4fxFJVpeDxweZFGaWE9/Ildr4vOS+4GZpE0Az3iX2WDrQPioKjuOw8TeUHRO
 xwvfv1TpyQFa2qHZLI4AmZSN8VJBw82OuAyZHAGsE4bekfafeqVFt0ZtYYoiAbIM
 rw+dUCnWARc7gm8z2PaYnZGs8O++Flb03clDeFrdrvfZIewXWEkZ1TxrKIb9bLyP
 A8tlSnbnCdXYSzyaFYH2TgUtc7gQosssfImuJjUq1qQkeEitLP6VzEsekN1h6sx7
 axFiBdiCXPvn8ti+AlK9tYfSM0ZhAzvfpuLM0hpTAk3De3NfbJQiyp6eyXAInLne
 cs9RGPXNPuKX0tISZ29vA8tmOSrDInfeEEW/Lqu4l+HedcLssWjReY0xVsZS3pbi
 xGiD5/Ztdha9keTIQdW+7R0SE1YsZTpwZbQt0HeHcE+pzFPF/3TLIIIYhYRVSPsm
 D+g5W+bVxht8NC380UEC8vpAyP1CYSnq/aVrDfJiXZVOS7b/dyZDk6Y6LSBOm9Em
 9qLaPASncxVinaNcGlyj
 =u6Zy
 -----END PGP SIGNATURE-----

Merge tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux

Pull devicetree changes from Grant Likely:
 "Here are the devicetree changes queued up for v4.1.  Nothing really
  exciting here.  Rob has another few commits for big-endian attached
  UARTs, but those will be sent in a separate merge request since they
  haven't been as thoroughly tested as this batch.

  Here are the highlights:

   - lots of unittest cleanup from Frank Rowand

   - bugfixes and updates to the of_graph code

   - tighten up of_get_mac_address() code

   - documentation updates"

* tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux:
  of/unittest: Fix of_platform_depopulate test case
  of/unittest: early return from test skips tests
  of/unittest: breadcrumbs to reduce pain of future maintainers
  of/unittest: reduce checkpatch noise - line after declarations
  of/unittest: typo in error string
  of/unittest: add const where needed
  of_net: factor out repetitive code from of_get_mac_address()
  drivers/of: Add empty ranges quirk for PA-Semi
  of: Allow selection of OF_DYNAMIC and OF_OVERLAY if OF_UNITTEST
  of: Empty node & property flag accessors when !OF
  of: Explicitly include linux/types.h in of_graph.h
  dt-bindings: brcm: rationalize Broadcom documentation naming
  of/unittest: replace 'selftest' with 'unittest'
  Documentation: rename of_selftest.txt to of_unittest.txt
  Documentation: update the of_selftest.txt
  dt: OF_UNITTEST make dependency broken
  MAINTAINERS: Pantelis Antoniou device tree overlay maintainer
  of: Add of_graph_get_port_by_id function
  of: Add for_each_endpoint_of_node helper macro
  of: Decrement refcount of previous endpoint in of_graph_get_next_endpoint

Documentation/devicetree/bindings/unittest.txt

@@ -1,60 +1,60 @@
-1) OF selftest platform device
+1) OF unittest platform device
 
-** selftest
+** unittest
 
 Required properties:
-- compatible: must be "selftest"
+- compatible: must be "unittest"
 
 All other properties are optional.
 
 Example:
-	selftest {
-		compatible = "selftest";
+	unittest {
+		compatible = "unittest";
 		status = "okay";
 	};
 
-2) OF selftest i2c adapter platform device
+2) OF unittest i2c adapter platform device
 
 ** platform device unittest adapter
 
 Required properties:
-- compatible: must be selftest-i2c-bus
+- compatible: must be unittest-i2c-bus
 
-Children nodes contain selftest i2c devices.
+Children nodes contain unittest i2c devices.
 
 Example:
-	selftest-i2c-bus {
-		compatible = "selftest-i2c-bus";
+	unittest-i2c-bus {
+		compatible = "unittest-i2c-bus";
 		status = "okay";
 	};
 
-3) OF selftest i2c device
+3) OF unittest i2c device
 
-** I2C selftest device
+** I2C unittest device
 
 Required properties:
-- compatible: must be selftest-i2c-dev
+- compatible: must be unittest-i2c-dev
 
 All other properties are optional
 
 Example:
-	selftest-i2c-dev {
-		compatible = "selftest-i2c-dev";
+	unittest-i2c-dev {
+		compatible = "unittest-i2c-dev";
 		status = "okay";
 	};
 
-4) OF selftest i2c mux device
+4) OF unittest i2c mux device
 
-** I2C selftest mux
+** I2C unittest mux
 
 Required properties:
-- compatible: must be selftest-i2c-mux
+- compatible: must be unittest-i2c-mux
 
-Children nodes contain selftest i2c bus nodes per channel.
+Children nodes contain unittest i2c bus nodes per channel.
 
 Example:
-	selftest-i2c-mux {
-		compatible = "selftest-i2c-mux";
+	unittest-i2c-mux {
+		compatible = "unittest-i2c-mux";
 		status = "okay";
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -64,7 +64,7 @@ Example:
 			#size-cells = <0>;
 			i2c-dev {
 				reg = <8>;
-				compatible = "selftest-i2c-dev";
+				compatible = "unittest-i2c-dev";
 				status = "okay";
 			};
 		};

Documentation/devicetree/of_unittest.txt

@@ -1,11 +1,11 @@
-Open Firmware Device Tree Selftest
+Open Firmware Device Tree Unittest
 ----------------------------------
 
 Author: Gaurav Minocha <gaurav.minocha.os@gmail.com>
 
 1. Introduction
 
-This document explains how the test data required for executing OF selftest
+This document explains how the test data required for executing OF unittest
 is attached to the live tree dynamically, independent of the machine's
 architecture.
 
@@ -22,31 +22,31 @@ most of the device drivers in various use cases.
 
 2. Test-data
 
-The Device Tree Source file (drivers/of/testcase-data/testcases.dts) contains
+The Device Tree Source file (drivers/of/unittest-data/testcases.dts) contains
 the test data required for executing the unit tests automated in
-drivers/of/selftests.c. Currently, following Device Tree Source Include files
-(.dtsi) are included in testcase.dts:
+drivers/of/unittest.c. Currently, following Device Tree Source Include files
+(.dtsi) are included in testcases.dts:
 
-drivers/of/testcase-data/tests-interrupts.dtsi
-drivers/of/testcase-data/tests-platform.dtsi
-drivers/of/testcase-data/tests-phandle.dtsi
-drivers/of/testcase-data/tests-match.dtsi
+drivers/of/unittest-data/tests-interrupts.dtsi
+drivers/of/unittest-data/tests-platform.dtsi
+drivers/of/unittest-data/tests-phandle.dtsi
+drivers/of/unittest-data/tests-match.dtsi
 
 When the kernel is build with OF_SELFTEST enabled, then the following make rule
 
 $(obj)/%.dtb: $(src)/%.dts FORCE
 	$(call if_changed_dep, dtc)
 
-is used to compile the DT source file (testcase.dts) into a binary blob
-(testcase.dtb), also referred as flattened DT.
+is used to compile the DT source file (testcases.dts) into a binary blob
+(testcases.dtb), also referred as flattened DT.
 
 After that, using the following rule the binary blob above is wrapped as an
-assembly file (testcase.dtb.S).
+assembly file (testcases.dtb.S).
 
 $(obj)/%.dtb.S: $(obj)/%.dtb
 	$(call cmd, dt_S_dtb)
 
-The assembly file is compiled into an object file (testcase.dtb.o), and is
+The assembly file is compiled into an object file (testcases.dtb.o), and is
 linked into the kernel image.
 
 
@@ -98,7 +98,7 @@ child11 -> sibling12 -> sibling13 -> sibling14 -> null
 Figure 1: Generic structure of un-flattened device tree
 
 
-Before executing OF selftest, it is required to attach the test data to
+Before executing OF unittest, it is required to attach the test data to
 machine's device tree (if present). So, when selftest_data_add() is called,
 at first it reads the flattened device tree data linked into the kernel image
 via the following kernel symbols:

MAINTAINERS

@@ -7243,6 +7243,15 @@ F:	Documentation/devicetree/
 F:	arch/*/boot/dts/
 F:	include/dt-bindings/
 
+OPEN FIRMWARE AND DEVICE TREE OVERLAYS
+M:	Pantelis Antoniou <pantelis.antoniou@konsulko.com>
+L:	devicetree@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/dynamic-resolution-notes.txt
+F:	Documentation/devicetree/overlay-notes.txt
+F:	drivers/of/overlay.c
+F:	drivers/of/resolver.c
+
 OPENRISC ARCHITECTURE
 M:	Jonas Bonn <jonas@southpole.se>
 W:	http://openrisc.net

drivers/coresight/of_coresight.c

@@ -52,15 +52,6 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
 			       endpoint, of_dev_node_match);
 }
 
-static struct device_node *of_get_coresight_endpoint(
-		const struct device_node *parent, struct device_node *prev)
-{
-	struct device_node *node = of_graph_get_next_endpoint(parent, prev);
-
-	of_node_put(prev);
-	return node;
-}
-
 static void of_coresight_get_ports(struct device_node *node,
 				   int *nr_inport, int *nr_outport)
 {
@@ -68,7 +59,7 @@ static void of_coresight_get_ports(struct device_node *node,
 	int in = 0, out = 0;
 
 	do {
-		ep = of_get_coresight_endpoint(node, ep);
+		ep = of_graph_get_next_endpoint(node, ep);
 		if (!ep)
 			break;
 
@@ -140,7 +131,7 @@ struct coresight_platform_data *of_get_coresight_platform_data(
 		/* Iterate through each port to discover topology */
 		do {
 			/* Get a handle on a port */
-			ep = of_get_coresight_endpoint(node, ep);
+			ep = of_graph_get_next_endpoint(node, ep);
 			if (!ep)
 				break;
 

drivers/gpu/drm/imx/imx-drm-core.c

@@ -431,15 +431,6 @@ int imx_drm_encoder_parse_of(struct drm_device *drm,
 }
 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 
-static struct device_node *imx_drm_of_get_next_endpoint(
-		const struct device_node *parent, struct device_node *prev)
-{
-	struct device_node *node = of_graph_get_next_endpoint(parent, prev);
-
-	of_node_put(prev);
-	return node;
-}
-
 /*
  * @node: device tree node containing encoder input ports
  * @encoder: drm_encoder
@@ -457,7 +448,7 @@ int imx_drm_encoder_get_mux_id(struct device_node *node,
 		return -EINVAL;
 
 	do {
-		ep = imx_drm_of_get_next_endpoint(node, ep);
+		ep = of_graph_get_next_endpoint(node, ep);
 		if (!ep)
 			break;
 

drivers/gpu/drm/rcar-du/rcar_du_kms.c

@@ -206,7 +206,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 	enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 	struct device_node *connector = NULL;
 	struct device_node *encoder = NULL;
-	struct device_node *prev = NULL;
+	struct device_node *ep_node = NULL;
 	struct device_node *entity_ep_node;
 	struct device_node *entity;
 	int ret;
@@ -225,11 +225,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 	entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 
 	while (1) {
-		struct device_node *ep_node;
-
-		ep_node = of_graph_get_next_endpoint(entity, prev);
-		of_node_put(prev);
-		prev = ep_node;
+		ep_node = of_graph_get_next_endpoint(entity, ep_node);
 
 		if (!ep_node)
 			break;
@@ -300,7 +296,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 {
 	struct device_node *np = rcdu->dev->of_node;
-	struct device_node *prev = NULL;
+	struct device_node *ep_node = NULL;
 	unsigned int num_encoders = 0;
 
 	/*
@@ -308,15 +304,12 @@ static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 	 * pipeline.
 	 */
 	while (1) {
-		struct device_node *ep_node;
 		enum rcar_du_output output;
 		struct of_endpoint ep;
 		unsigned int i;
 		int ret;
 
-		ep_node = of_graph_get_next_endpoint(np, prev);
-		of_node_put(prev);
-		prev = ep_node;
+		ep_node = of_graph_get_next_endpoint(np, ep_node);
 
 		if (ep_node == NULL)
 			break;

drivers/media/platform/am437x/am437x-vpfe.c

@@ -2504,7 +2504,6 @@ vpfe_get_pdata(struct platform_device *pdev)
 					     GFP_KERNEL);
 		pdata->asd[i]->match_type = V4L2_ASYNC_MATCH_OF;
 		pdata->asd[i]->match.of.node = rem;
-		of_node_put(endpoint);
 		of_node_put(rem);
 	}
 

drivers/media/platform/soc_camera/soc_camera.c

@@ -1694,7 +1694,6 @@ static void scan_of_host(struct soc_camera_host *ici)
 		if (!i)
 			soc_of_bind(ici, epn, ren->parent);
 
-		of_node_put(epn);
 		of_node_put(ren);
 
 		if (i) {
@@ -1702,6 +1701,8 @@ static void scan_of_host(struct soc_camera_host *ici)
 			break;
 		}
 	}
+
+	of_node_put(epn);
 }
 
 #else

drivers/of/Kconfig

@@ -34,7 +34,11 @@ config OF_PROMTREE
 # Hardly any platforms need this.  It is safe to select, but only do so if you
 # need it.
 config OF_DYNAMIC
-	bool
+	bool "Support for dynamic device trees" if OF_UNITTEST
+	help
+	  On some platforms, the device tree can be manipulated at runtime.
+	  While this option is selected automatically on such platforms, you
+	  can enable it manually to improve device tree unit test coverage.
 
 config OF_ADDRESS
 	def_bool y
@@ -87,5 +91,10 @@ config OF_OVERLAY
 	bool "Device Tree overlays"
 	select OF_DYNAMIC
 	select OF_RESOLVE
+	help
+	  Overlays are a method to dynamically modify part of the kernel's
+	  device tree with dynamically loaded data.
+	  While this option is selected automatically when needed, you can
+	  enable it manually to improve device tree unit test coverage.
 
 endmenu # OF

drivers/of/Makefile

@@ -6,8 +6,7 @@ obj-$(CONFIG_OF_PROMTREE) += pdt.o
 obj-$(CONFIG_OF_ADDRESS)  += address.o
 obj-$(CONFIG_OF_IRQ)    += irq.o
 obj-$(CONFIG_OF_NET)	+= of_net.o
-obj-$(CONFIG_OF_UNITTEST) += of_unittest.o
-of_unittest-objs := unittest.o unittest-data/testcases.dtb.o
+obj-$(CONFIG_OF_UNITTEST) += unittest.o
 obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
 obj-$(CONFIG_OF_PCI)	+= of_pci.o
 obj-$(CONFIG_OF_PCI_IRQ)  += of_pci_irq.o
@@ -16,5 +15,7 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 
+obj-$(CONFIG_OF_UNITTEST) += unittest-data/
+
 CFLAGS_fdt.o = -I$(src)/../../scripts/dtc/libfdt
 CFLAGS_fdt_address.o = -I$(src)/../../scripts/dtc/libfdt

drivers/of/base.c

@@ -2108,14 +2108,45 @@ int of_graph_parse_endpoint(const struct device_node *node,
 }
 EXPORT_SYMBOL(of_graph_parse_endpoint);
 
+/**
+ * of_graph_get_port_by_id() - get the port matching a given id
+ * @parent: pointer to the parent device node
+ * @id: id of the port
+ *
+ * Return: A 'port' node pointer with refcount incremented. The caller
+ * has to use of_node_put() on it when done.
+ */
+struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
+{
+	struct device_node *node, *port;
+
+	node = of_get_child_by_name(parent, "ports");
+	if (node)
+		parent = node;
+
+	for_each_child_of_node(parent, port) {
+		u32 port_id = 0;
+
+		if (of_node_cmp(port->name, "port") != 0)
+			continue;
+		of_property_read_u32(port, "reg", &port_id);
+		if (id == port_id)
+			break;
+	}
+
+	of_node_put(node);
+
+	return port;
+}
+EXPORT_SYMBOL(of_graph_get_port_by_id);
+
 /**
  * of_graph_get_next_endpoint() - get next endpoint node
  * @parent: pointer to the parent device node
  * @prev: previous endpoint node, or NULL to get first
  *
  * Return: An 'endpoint' node pointer with refcount incremented. Refcount
- * of the passed @prev node is not decremented, the caller have to use
- * of_node_put() on it when done.
+ * of the passed @prev node is decremented.
  */
 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 					struct device_node *prev)
@@ -2151,12 +2182,6 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 		if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
 			      __func__, prev->full_name))
 			return NULL;
-
-		/*
-		 * Avoid dropping prev node refcount to 0 when getting the next
-		 * child below.
-		 */
-		of_node_get(prev);
 	}
 
 	while (1) {

drivers/of/of_net.c

@@ -38,6 +38,15 @@ int of_get_phy_mode(struct device_node *np)
 }
 EXPORT_SYMBOL_GPL(of_get_phy_mode);
 
+static const void *of_get_mac_addr(struct device_node *np, const char *name)
+{
+	struct property *pp = of_find_property(np, name, NULL);
+
+	if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value))
+		return pp->value;
+	return NULL;
+}
+
 /**
  * Search the device tree for the best MAC address to use.  'mac-address' is
  * checked first, because that is supposed to contain to "most recent" MAC
@@ -58,20 +67,16 @@ EXPORT_SYMBOL_GPL(of_get_phy_mode);
 */
 const void *of_get_mac_address(struct device_node *np)
 {
-	struct property *pp;
+	const void *addr;
 
-	pp = of_find_property(np, "mac-address", NULL);
-	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
-		return pp->value;
+	addr = of_get_mac_addr(np, "mac-address");
+	if (addr)
+		return addr;
 
-	pp = of_find_property(np, "local-mac-address", NULL);
-	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
-		return pp->value;
+	addr = of_get_mac_addr(np, "local-mac-address");
+	if (addr)
+		return addr;
 
-	pp = of_find_property(np, "address", NULL);
-	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
-		return pp->value;
-
-	return NULL;
+	return of_get_mac_addr(np, "address");
 }
 EXPORT_SYMBOL(of_get_mac_address);

drivers/of/unittest-data/.gitignore

@@ -0,0 +1,2 @@
+testcases.dtb
+testcases.dtb.S

drivers/of/unittest-data/Makefile

@@ -0,0 +1,7 @@
+obj-y += testcases.dtb.o
+
+targets += testcases.dtb testcases.dtb.S
+
+.SECONDARY: \
+	$(obj)/testcases.dtb.S \
+	$(obj)/testcases.dtb

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

@@ -4,94 +4,94 @@
 		overlay-node {
 
 			/* test bus */
-			selftestbus: test-bus {
+			unittestbus: test-bus {
 				compatible = "simple-bus";
 				#address-cells = <1>;
 				#size-cells = <0>;
 
-				selftest100: test-selftest100 {
-					compatible = "selftest";
+				unittest100: test-unittest100 {
+					compatible = "unittest";
 					status = "okay";
 					reg = <100>;
 				};
 
-				selftest101: test-selftest101 {
-					compatible = "selftest";
+				unittest101: test-unittest101 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <101>;
 				};
 
-				selftest0: test-selftest0 {
-					compatible = "selftest";
+				unittest0: test-unittest0 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <0>;
 				};
 
-				selftest1: test-selftest1 {
-					compatible = "selftest";
+				unittest1: test-unittest1 {
+					compatible = "unittest";
 					status = "okay";
 					reg = <1>;
 				};
 
-				selftest2: test-selftest2 {
-					compatible = "selftest";
+				unittest2: test-unittest2 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <2>;
 				};
 
-				selftest3: test-selftest3 {
-					compatible = "selftest";
+				unittest3: test-unittest3 {
+					compatible = "unittest";
 					status = "okay";
 					reg = <3>;
 				};
 
-				selftest5: test-selftest5 {
-					compatible = "selftest";
+				unittest5: test-unittest5 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <5>;
 				};
 
-				selftest6: test-selftest6 {
-					compatible = "selftest";
+				unittest6: test-unittest6 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <6>;
 				};
 
-				selftest7: test-selftest7 {
-					compatible = "selftest";
+				unittest7: test-unittest7 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <7>;
 				};
 
-				selftest8: test-selftest8 {
-					compatible = "selftest";
+				unittest8: test-unittest8 {
+					compatible = "unittest";
 					status = "disabled";
 					reg = <8>;
 				};
 
 				i2c-test-bus {
-					compatible = "selftest-i2c-bus";
+					compatible = "unittest-i2c-bus";
 					status = "okay";
 					reg = <50>;
 
 					#address-cells = <1>;
 					#size-cells = <0>;
 
-					test-selftest12 {
+					test-unittest12 {
 						reg = <8>;
-						compatible = "selftest-i2c-dev";
+						compatible = "unittest-i2c-dev";
 						status = "disabled";
 					};
 
-					test-selftest13 {
+					test-unittest13 {
 						reg = <9>;
-						compatible = "selftest-i2c-dev";
+						compatible = "unittest-i2c-dev";
 						status = "okay";
 					};
 
-					test-selftest14 {
+					test-unittest14 {
 						reg = <10>;
-						compatible = "selftest-i2c-mux";
+						compatible = "unittest-i2c-mux";
 						status = "okay";
 
 						#address-cells = <1>;
@@ -104,7 +104,7 @@
 
 							test-mux-dev {
 								reg = <32>;
-								compatible = "selftest-i2c-dev";
+								compatible = "unittest-i2c-dev";
 								status = "okay";
 							};
 						};
@@ -116,7 +116,7 @@
 		/* test enable using absolute target path */
 		overlay0 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest0";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest0";
 				__overlay__ {
 					status = "okay";
 				};
@@ -126,7 +126,7 @@
 		/* test disable using absolute target path */
 		overlay1 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest1";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest1";
 				__overlay__ {
 					status = "disabled";
 				};
@@ -136,7 +136,7 @@
 		/* test enable using label */
 		overlay2 {
 			fragment@0 {
-				target = <&selftest2>;
+				target = <&unittest2>;
 				__overlay__ {
 					status = "okay";
 				};
@@ -146,7 +146,7 @@
 		/* test disable using label */
 		overlay3 {
 			fragment@0 {
-				target = <&selftest3>;
+				target = <&unittest3>;
 				__overlay__ {
 					status = "disabled";
 				};
@@ -156,15 +156,15 @@
 		/* test insertion of a full node */
 		overlay4 {
 			fragment@0 {
-				target = <&selftestbus>;
+				target = <&unittestbus>;
 				__overlay__ {
 
 					/* suppress DTC warning */
 					#address-cells = <1>;
 					#size-cells = <0>;
 
-					test-selftest4 {
-						compatible = "selftest";
+					test-unittest4 {
+						compatible = "unittest";
 						status = "okay";
 						reg = <4>;
 					};
@@ -175,7 +175,7 @@
 		/* test overlay apply revert */
 		overlay5 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest5";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest5";
 				__overlay__ {
 					status = "okay";
 				};
@@ -185,7 +185,7 @@
 		/* test overlays application and removal in sequence */
 		overlay6 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest6";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest6";
 				__overlay__ {
 					status = "okay";
 				};
@@ -193,7 +193,7 @@
 		};
 		overlay7 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest7";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest7";
 				__overlay__ {
 					status = "okay";
 				};
@@ -203,7 +203,7 @@
 		/* test overlays application and removal in bad sequence */
 		overlay8 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest8";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
 				__overlay__ {
 					status = "okay";
 				};
@@ -211,7 +211,7 @@
 		};
 		overlay9 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/test-selftest8";
+				target-path = "/testcase-data/overlay-node/test-bus/test-unittest8";
 				__overlay__ {
 					property-foo = "bar";
 				};
@@ -227,16 +227,16 @@
 					#address-cells = <1>;
 					#size-cells = <0>;
 
-					test-selftest10 {
-						compatible = "selftest";
+					test-unittest10 {
+						compatible = "unittest";
 						status = "okay";
 						reg = <10>;
 
 						#address-cells = <1>;
 						#size-cells = <0>;
 
-						test-selftest101 {
-							compatible = "selftest";
+						test-unittest101 {
+							compatible = "unittest";
 							status = "okay";
 							reg = <1>;
 						};
@@ -255,16 +255,16 @@
 					#address-cells = <1>;
 					#size-cells = <0>;
 
-					test-selftest11 {
-						compatible = "selftest";
+					test-unittest11 {
+						compatible = "unittest";
 						status = "okay";
 						reg = <11>;
 
 						#address-cells = <1>;
 						#size-cells = <0>;
 
-						test-selftest111 {
-							compatible = "selftest";
+						test-unittest111 {
+							compatible = "unittest";
 							status = "okay";
 							reg = <1>;
 						};
@@ -277,7 +277,7 @@
 		/* test enable using absolute target path (i2c) */
 		overlay12 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-selftest12";
+				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12";
 				__overlay__ {
 					status = "okay";
 				};
@@ -287,7 +287,7 @@
 		/* test disable using absolute target path (i2c) */
 		overlay13 {
 			fragment@0 {
-				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-selftest13";
+				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13";
 				__overlay__ {
 					status = "disabled";
 				};
@@ -301,9 +301,9 @@
 				__overlay__ {
 					#address-cells = <1>;
 					#size-cells = <0>;
-					test-selftest15 {
+					test-unittest15 {
 						reg = <11>;
-						compatible = "selftest-i2c-mux";
+						compatible = "unittest-i2c-mux";
 						status = "okay";
 
 						#address-cells = <1>;
@@ -316,7 +316,7 @@
 
 							test-mux-dev {
 								reg = <32>;
-								compatible = "selftest-i2c-dev";
+								compatible = "unittest-i2c-dev";
 								status = "okay";
 							};
 						};

drivers/video/fbdev/omap2/dss/omapdss-boot-init.c

@@ -164,20 +164,15 @@ static void __init omapdss_walk_device(struct device_node *node, bool root)
 
 		pn = of_graph_get_remote_port_parent(n);
 
-		if (!pn) {
-			of_node_put(n);
+		if (!pn)
 			continue;
-		}
 
 		if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
 			of_node_put(pn);
-			of_node_put(n);
 			continue;
 		}
 
 		omapdss_walk_device(pn, false);
-
-		of_node_put(n);
 	}
 }
 

include/linux/of.h

@@ -622,6 +622,38 @@ static inline const char *of_prop_next_string(struct property *prop,
 	return NULL;
 }
 
+static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
+{
+	return 0;
+}
+
+static inline int of_node_test_and_set_flag(struct device_node *n,
+					    unsigned long flag)
+{
+	return 0;
+}
+
+static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
+{
+}
+
+static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
+{
+}
+
+static inline int of_property_check_flag(struct property *p, unsigned long flag)
+{
+	return 0;
+}
+
+static inline void of_property_set_flag(struct property *p, unsigned long flag)
+{
+}
+
+static inline void of_property_clear_flag(struct property *p, unsigned long flag)
+{
+}
+
 #define of_match_ptr(_ptr)	NULL
 #define of_match_node(_matches, _node)	NULL
 #endif /* CONFIG_OF */

include/linux/of_graph.h

@@ -14,6 +14,8 @@
 #ifndef __LINUX_OF_GRAPH_H
 #define __LINUX_OF_GRAPH_H
 
+#include <linux/types.h>
+
 /**
  * struct of_endpoint - the OF graph endpoint data structure
  * @port: identifier (value of reg property) of a port this endpoint belongs to
@@ -26,9 +28,21 @@ struct of_endpoint {
 	const struct device_node *local_node;
 };
 
+/**
+ * for_each_endpoint_of_node - iterate over every endpoint in a device node
+ * @parent: parent device node containing ports and endpoints
+ * @child: loop variable pointing to the current endpoint node
+ *
+ * When breaking out of the loop, of_node_put(child) has to be called manually.
+ */
+#define for_each_endpoint_of_node(parent, child) \
+	for (child = of_graph_get_next_endpoint(parent, NULL); child != NULL; \
+	     child = of_graph_get_next_endpoint(parent, child))
+
 #ifdef CONFIG_OF
 int of_graph_parse_endpoint(const struct device_node *node,
 				struct of_endpoint *endpoint);
+struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id);
 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 					struct device_node *previous);
 struct device_node *of_graph_get_remote_port_parent(
@@ -42,6 +56,12 @@ static inline int of_graph_parse_endpoint(const struct device_node *node,
 	return -ENOSYS;
 }
 
+static inline struct device_node *of_graph_get_port_by_id(
+					struct device_node *node, u32 id)
+{
+	return NULL;
+}
+
 static inline struct device_node *of_graph_get_next_endpoint(
 					const struct device_node *parent,
 					struct device_node *previous)