Merge tag 'devicetree-for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull DeviceTree changes from Rob Herring:

- DT unittests for I2C probing and overlays from Pantelis Antoniou

- Remove DT unittest dependency on OF_DYNAMIC from Gaurav Minocha

- Add Tegra compatible strings missing for newer parts from Paul
Walmsley

- Various vendor prefix additions

* tag 'devicetree-for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
of: Add vendor prefix for OmniVision Technologies
of: Use ovti for Omnivision
of: Add vendor prefix for Truly Semiconductors Limited
of: Add vendor prefix for Himax Technologies Inc.
of/fdt: fix sparse warning
of: unitest: Add I2C overlay unit tests.
Documentation: DT: document compatible string existence requirement
Documentation: DT bindings: add nvidia, tegra132-denver compatible string
Documentation: DT bindings: add more Tegra chip compatible strings
of: EXPORT_SYMBOL_GPL of_property_read_u64_array
of: Fix brace position for struct of_device_id definition
of/unittest: Remove obsolete code
dt-bindings: use isil prefix for Intersil in vendor-prefixes.txt
Add AD Holdings Plc. to vendor-prefixes.
dt-bindings: Add Silicon Mitus vendor prefix
Removes OF_UNITTEST dependency on OF_DYNAMIC config symbol
pinctrl: fix up device tree bindings
DT: Vendors: Add Everspin
doc: add bindings document for altera fpga manager
drivers: of: Export of_reserved_mem_device_{init,release}

Documentation/devicetree/bindings/arm/cpus.txt

···
 			    "marvell,pj4a"
 			    "marvell,pj4b"
 			    "marvell,sheeva-v5"
+			    "nvidia,tegra132-denver"
 			    "qcom,krait"
 			    "qcom,scorpion"
 	- enable-method

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-ahb.txt

···
 NVIDIA Tegra AHB
 
 Required properties:
-- compatible : "nvidia,tegra20-ahb" or "nvidia,tegra30-ahb"
+- compatible : For Tegra20, must contain "nvidia,tegra20-ahb".  For
+  Tegra30, must contain "nvidia,tegra30-ahb".  Otherwise, must contain
+  '"nvidia,<chip>-ahb", "nvidia,tegra30-ahb"' where <chip> is tegra124,
+  tegra132, or tegra210.
 - reg : Should contain 1 register ranges(address and length)
 
 Example:

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt

···
 
 Required properties:
 - name : Should be pmc
-- compatible : Should contain "nvidia,tegra<chip>-pmc".
+- compatible : For Tegra20, must contain "nvidia,tegra20-pmc".  For Tegra30,
+  must contain "nvidia,tegra30-pmc".  For Tegra114, must contain
+  "nvidia,tegra114-pmc".  For Tegra124, must contain "nvidia,tegra124-pmc".
+  Otherwise, must contain "nvidia,<chip>-pmc", plus at least one of the
+  above, where <chip> is tegra132.
 - reg : Offset and length of the register set for the device
 - clocks : Must contain an entry for each entry in clock-names.
   See ../clocks/clock-bindings.txt for details.

Documentation/devicetree/bindings/ata/tegra-sata.txt

···
 Tegra124 SoC SATA AHCI controller
 
 Required properties :
-- compatible : "nvidia,tegra124-ahci".
+- compatible : For Tegra124, must contain "nvidia,tegra124-ahci".  Otherwise,
+  must contain '"nvidia,<chip>-ahci", "nvidia,tegra124-ahci"', where <chip>
+  is tegra132.
 - reg : Should contain 2 entries:
   - AHCI register set (SATA BAR5)
   - SATA register set

Documentation/devicetree/bindings/fpga/altera-socfpga-fpga-mgr.txt

···
+Altera SOCFPGA FPGA Manager
+
+Required properties:
+- compatible : should contain "altr,socfpga-fpga-mgr"
+- reg        : base address and size for memory mapped io.
+               - The first index is for FPGA manager register access.
+               - The second index is for writing FPGA configuration data.
+- interrupts : interrupt for the FPGA Manager device.
+
+Example:
+
+	hps_0_fpgamgr: fpgamgr@0xff706000 {
+		compatible = "altr,socfpga-fpga-mgr";
+		reg = <0xFF706000 0x1000
+		       0xFFB90000 0x1000>;
+		interrupts = <0 175 4>;
+	};

Documentation/devicetree/bindings/fuse/nvidia,tegra20-fuse.txt

···
 NVIDIA Tegra20/Tegra30/Tegr114/Tegra124 fuse block.
 
 Required properties:
-- compatible : should be:
-	"nvidia,tegra20-efuse"
-	"nvidia,tegra30-efuse"
-	"nvidia,tegra114-efuse"
-	"nvidia,tegra124-efuse"
+- compatible : For Tegra20, must contain "nvidia,tegra20-efuse".  For Tegra30,
+  must contain "nvidia,tegra30-efuse".  For Tegra114, must contain
+  "nvidia,tegra114-efuse".  For Tegra124, must contain "nvidia,tegra124-efuse".
+  Otherwise, must contain "nvidia,<chip>-efuse", plus one of the above, where
+  <chip> is tegra132.
   Details:
   nvidia,tegra20-efuse: Tegra20 requires using APB DMA to read the fuse data
 	due to a hardware bug. Tegra20 also lacks certain information which is

Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt

···
 - sor: serial output resource
 
   Required properties:
-  - compatible: "nvidia,tegra124-sor"
+  - compatible: For Tegra124, must contain "nvidia,tegra124-sor".  Otherwise,
+    must contain '"nvidia,<chip>-sor", "nvidia,tegra124-sor"', where <chip>
+    is tegra132.
   - reg: Physical base address and length of the controller's registers.
   - interrupts: The interrupt outputs from the controller.
   - clocks: Must contain an entry for each entry in clock-names.
···
   - nvidia,dpaux: phandle to a DispayPort AUX interface
 
 - dpaux: DisplayPort AUX interface
-  - compatible: "nvidia,tegra124-dpaux"
+  - compatible: For Tegra124, must contain "nvidia,tegra124-dpaux".  Otherwise,
+    must contain '"nvidia,<chip>-dpaux", "nvidia,tegra124-dpaux"', where
+    <chip> is tegra132.
   - reg: Physical base address and length of the controller's registers.
   - interrupts: The interrupt outputs from the controller.
   - clocks: Must contain an entry for each entry in clock-names.

Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.txt

···
 NVIDIA Tegra20/Tegra30/Tegra114 I2C controller driver.
 
 Required properties:
-- compatible : should be:
-	"nvidia,tegra114-i2c"
-	"nvidia,tegra30-i2c"
-	"nvidia,tegra20-i2c"
-	"nvidia,tegra20-i2c-dvc"
+- compatible : For Tegra20, must be one of "nvidia,tegra20-i2c-dvc" or
+  "nvidia,tegra20-i2c".  For Tegra30, must be "nvidia,tegra30-i2c".
+  For Tegra114, must be "nvidia,tegra114-i2c".  Otherwise, must be
+  "nvidia,<chip>-i2c", plus at least one of the above, where <chip> is
+  tegra124, tegra132, or tegra210.
   Details of compatible are as follows:
   nvidia,tegra20-i2c-dvc: Tegra20 has specific I2C controller called as DVC I2C
 	controller. This only support master mode of I2C communication. Register

Documentation/devicetree/bindings/media/atmel-isi.txt

···
 
 	i2c1: i2c@f0018000 {
 		ov2640: camera@0x30 {
-			compatible = "omnivision,ov2640";
+			compatible = "ovti,ov2640";
 			reg = <0x30>;
 
 			port {

Documentation/devicetree/bindings/media/video-interfaces.txt

···
 	i2c0: i2c@0xfff20000 {
 		...
 		ov772x_1: camera@0x21 {
-			compatible = "omnivision,ov772x";
+			compatible = "ovti,ov772x";
 			reg = <0x21>;
 			vddio-supply = <&regulator1>;
 			vddcore-supply = <&regulator2>;

Documentation/devicetree/bindings/misc/nvidia,tegra20-apbmisc.txt

···
 NVIDIA Tegra20/Tegra30/Tegr114/Tegra124 apbmisc block
 
 Required properties:
-- compatible : should be:
-       "nvidia,tegra20-apbmisc"
-       "nvidia,tegra30-apbmisc"
-       "nvidia,tegra114-apbmisc"
-       "nvidia,tegra124-apbmisc"
+- compatible : For Tegra20, must be "nvidia,tegra20-apbmisc".  For Tegra30,
+  must be "nvidia,tegra30-apbmisc".  Otherwise, must contain
+  "nvidia,<chip>-apbmisc", plus one of the above, where <chip> is tegra114,
+  tegra124, tegra132.
 - reg: Should contain 2 entries: the first entry gives the physical address
        and length of the registers which contain revision and debug features.
        The second entry gives the physical address and length of the

Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt

···
 by mmc.txt and the properties used by the sdhci-tegra driver.
 
 Required properties:
-- compatible : Should be "nvidia,<chip>-sdhci"
+- compatible : For Tegra20, must contain "nvidia,tegra20-sdhci".
+  For Tegra30, must contain "nvidia,tegra30-sdhci".  For Tegra114,
+  must contain "nvidia,tegra114-sdhci".  For Tegra124, must contain
+  "nvidia,tegra124-sdhci".  Otherwise, must contain "nvidia,<chip>-sdhci",
+  plus one of the above, where <chip> is tegra132 or tegra210.
 - clocks : Must contain one entry, for the module clock.
   See ../clocks/clock-bindings.txt for details.
 - resets : Must contain an entry for each entry in reset-names.

Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt

···
 NVIDIA Tegra PCIe controller
 
 Required properties:
-- compatible: Must be one of:
-  - "nvidia,tegra20-pcie"
-  - "nvidia,tegra30-pcie"
-  - "nvidia,tegra124-pcie"
+- compatible: For Tegra20, must contain "nvidia,tegra20-pcie".  For Tegra30,
+  "nvidia,tegra30-pcie".  For Tegra124, must contain "nvidia,tegra124-pcie".
+  Otherwise, must contain "nvidia,<chip>-pcie", plus one of the above, where
+  <chip> is tegra132 or tegra210.
 - device_type: Must be "pci"
 - reg: A list of physical base address and length for each set of controller
   registers. Must contain an entry for each entry in the reg-names property.

Documentation/devicetree/bindings/pinctrl/nvidia,tegra124-pinmux.txt

···
 a baseline, and only documents the differences between the two bindings.
 
 Required properties:
-- compatible: "nvidia,tegra124-pinmux"
+- compatible: For Tegra124, must contain "nvidia,tegra124-pinmux".  For
+  Tegra132, must contain '"nvidia,tegra132-pinmux", "nvidia-tegra124-pinmux"'.
 - reg: Should contain a list of base address and size pairs for:
     -- first entry - the drive strength and pad control registers.
     -- second entry - the pinmux registers

Documentation/devicetree/bindings/pinctrl/nvidia,tegra124-xusb-padctl.txt

···
 
 Required properties:
 --------------------
-- compatible: should be "nvidia,tegra124-xusb-padctl"
+- compatible: For Tegra124, must contain "nvidia,tegra124-xusb-padctl".
+  Otherwise, must contain '"nvidia,<chip>-xusb-padctl",
+  "nvidia-tegra124-xusb-padctl"', where <chip> is tegra132 or tegra210.
 - reg: Physical base address and length of the controller's registers.
 - resets: Must contain an entry for each entry in reset-names.
   See ../reset/reset.txt for details.

Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt

···
 Tegra SoC PWFM controller
 
 Required properties:
-- compatible: should be one of:
-  - "nvidia,tegra20-pwm"
-  - "nvidia,tegra30-pwm"
+- compatible: For Tegra20, must contain "nvidia,tegra20-pwm".  For Tegra30,
+  must contain "nvidia,tegra30-pwm".  Otherwise, must contain
+  "nvidia,<chip>-pwm", plus one of the above, where <chip> is tegra114,
+  tegra124, tegra132, or tegra210.
 - reg: physical base address and length of the controller's registers
 - #pwm-cells: should be 2. See pwm.txt in this directory for a description of
   the cells format.

Documentation/devicetree/bindings/rtc/nvidia,tegra20-rtc.txt

···
 
 Required properties:
 
-- compatible : should be "nvidia,tegra20-rtc".
+- compatible : For Tegra20, must contain "nvidia,tegra20-rtc".  Otherwise,
+  must contain '"nvidia,<chip>-rtc", "nvidia,tegra20-rtc"', where <chip>
+  can be tegra30, tegra114, tegra124, or tegra132.
 - reg : Specifies base physical address and size of the registers.
 - interrupts : A single interrupt specifier.
 - clocks : Must contain one entry, for the module clock.

Documentation/devicetree/bindings/serial/of-serial.txt

···
 	- "ns16550"
 	- "ns16750"
 	- "ns16850"
-	- "nvidia,tegra20-uart"
+	- For Tegra20, must contain "nvidia,tegra20-uart"
+	- For other Tegra, must contain '"nvidia,<chip>-uart",
+	  "nvidia,tegra20-uart"' where <chip> is tegra30, tegra114, tegra124,
+	  tegra132, or tegra210.
 	- "nxp,lpc3220-uart"
 	- "ralink,rt2880-uart"
 	- "ibm,qpace-nwp-serial"

Documentation/devicetree/bindings/sound/nvidia,tegra30-ahub.txt

···
 NVIDIA Tegra30 AHUB (Audio Hub)
 
 Required properties:
-- compatible : "nvidia,tegra30-ahub", "nvidia,tegra114-ahub", etc.
+- compatible : For Tegra30, must contain "nvidia,tegra30-ahub".  For Tegra114,
+  must contain "nvidia,tegra114-ahub".  For Tegra124, must contain
+  "nvidia,tegra124-ahub".  Otherwise, must contain "nvidia,<chip>-ahub",
+  plus at least one of the above, where <chip> is tegra132.
 - reg : Should contain the register physical address and length for each of
   the AHUB's register blocks.
   - Tegra30 requires 2 entries, for the APBIF and AHUB/AUDIO register blocks.

Documentation/devicetree/bindings/sound/nvidia,tegra30-hda.txt

···
 NVIDIA Tegra30 HDA controller
 
 Required properties:
-- compatible : "nvidia,tegra30-hda"
+- compatible : For Tegra30, must contain "nvidia,tegra30-hda".  Otherwise,
+  must contain '"nvidia,<chip>-hda", "nvidia,tegra30-hda"', where <chip> is
+  tegra114, tegra124, or tegra132.
 - reg : Should contain the HDA registers location and length.
 - interrupts : The interrupt from the HDA controller.
 - clocks : Must contain an entry for each required entry in clock-names.

Documentation/devicetree/bindings/sound/nvidia,tegra30-i2s.txt

···
 NVIDIA Tegra30 I2S controller
 
 Required properties:
-- compatible : "nvidia,tegra30-i2s"
+- compatible : For Tegra30, must contain "nvidia,tegra30-i2s".  For Tegra124,
+  must contain "nvidia,tegra124-i2s".  Otherwise, must contain
+  "nvidia,<chip>-i2s" plus at least one of the above, where <chip> is
+  tegra114 or tegra132.
 - reg : Should contain I2S registers location and length
 - clocks : Must contain one entry, for the module clock.
   See ../clocks/clock-bindings.txt for details.

Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt

···
 NVIDIA Tegra114 SPI controller.
 
 Required properties:
-- compatible : should be "nvidia,tegra114-spi".
+- compatible : For Tegra114, must contain "nvidia,tegra114-spi".
+  Otherwise, must contain '"nvidia,<chip>-spi", "nvidia,tegra114-spi"' where
+  <chip> is tegra124, tegra132, or tegra210.
 - reg: Should contain SPI registers location and length.
 - interrupts: Should contain SPI interrupts.
 - clock-names : Must include the following entries:

Documentation/devicetree/bindings/submitting-patches.txt

···
   3) The Documentation/ portion of the patch should come in the series before
      the code implementing the binding.
 
+  4) Any compatible strings used in a chip or board DTS file must be
+     previously documented in the corresponding DT binding text file
+     in Documentation/devicetree/bindings.  This rule applies even if
+     the Linux device driver does not yet match on the compatible
+     string.  [ checkpatch will emit warnings if this step is not
+     followed as of commit bff5da4335256513497cc8c79f9a9d1665e09864
+     ("checkpatch: add DT compatible string documentation checks"). ]
+
+  5) The wildcard "<chip>" may be used in compatible strings, as in
+     the following example:
+
+         - compatible: Must contain '"nvidia,<chip>-pcie",
+           "nvidia,tegra20-pcie"' where <chip> is tegra30, tegra132, ...
+
+     As in the above example, the known values of "<chip>" should be
+     documented if it is used.
+
+  6) If a documented compatible string is not yet matched by the
+     driver, the documentation should also include a compatible
+     string that is matched by the driver (as in the "nvidia,tegra20-pcie"
+     example above).
+
+
 II. For kernel maintainers
 
   1) If you aren't comfortable reviewing a given binding, reply to it and ask

Documentation/devicetree/bindings/thermal/tegra-soctherm.txt

···
 overheating situation.
 
 Required properties :
-- compatible : "nvidia,tegra124-soctherm".
+- compatible : For Tegra124, must contain "nvidia,tegra124-soctherm".
+  For Tegra132, must contain "nvidia,tegra132-soctherm".
+  For Tegra210, must contain "nvidia,tegra210-soctherm".
 - reg : Should contain 1 entry:
   - SOCTHERM register set
 - interrupts : Defines the interrupt used by SOCTHERM

Documentation/devicetree/bindings/timer/nvidia,tegra30-timer.txt

···
 
 Required properties:
 
-- compatible : should be "nvidia,tegra30-timer", "nvidia,tegra20-timer".
+- compatible : For Tegra30, must contain "nvidia,tegra30-timer".  Otherwise,
+  must contain '"nvidia,<chip>-timer", "nvidia,tegra30-timer"' where
+  <chip> is tegra124 or tegra132.
 - reg : Specifies base physical address and size of the registers.
 - interrupts : A list of 6 interrupts; one per each of timer channels 1
     through 5, and one for the shared interrupt for the remaining channels.

Documentation/devicetree/bindings/unittest.txt

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

Documentation/devicetree/bindings/usb/nvidia,tegra20-ehci.txt

···
 and additions :
 
 Required properties :
- - compatible : Should be "nvidia,tegra20-ehci".
+ - compatible : For Tegra20, must contain "nvidia,tegra20-ehci".
+   For Tegra30, must contain "nvidia,tegra30-ehci".  Otherwise, must contain
+   "nvidia,<chip>-ehci" plus at least one of the above, where <chip> is
+   tegra114, tegra124, tegra132, or tegra210.
  - nvidia,phy : phandle of the PHY that the controller is connected to.
  - clocks : Must contain one entry, for the module clock.
    See ../clocks/clock-bindings.txt for details.

Documentation/devicetree/bindings/usb/nvidia,tegra20-usb-phy.txt

···
 The device node for Tegra SOC USB PHY:
 
 Required properties :
- - compatible : Should be "nvidia,tegra<chip>-usb-phy".
+ - compatible : For Tegra20, must contain "nvidia,tegra20-usb-phy".
+   For Tegra30, must contain "nvidia,tegra30-usb-phy".  Otherwise, must contain
+   "nvidia,<chip>-usb-phy" plus at least one of the above, where <chip> is
+   tegra114, tegra124, tegra132, or tegra210.
  - reg : Defines the following set of registers, in the order listed:
    - The PHY's own register set.
      Always present.

Documentation/devicetree/bindings/vendor-prefixes.txt

···
 active-semi	Active-Semi International Inc
 ad	Avionic Design GmbH
 adapteva	Adapteva, Inc.
+adh	AD Holdings Plc.
 adi	Analog Devices, Inc.
 aeroflexgaisler	Aeroflex Gaisler AB
 allwinner	Allwinner Technology Co., Ltd.
···
 ettus	NI Ettus Research
 eukrea  Eukréa Electromatique
 everest	Everest Semiconductor Co. Ltd.
+everspin	Everspin Technologies, Inc.
 excito	Excito
 fcs	Fairchild Semiconductor
 fsl	Freescale Semiconductor
···
 gw	Gateworks Corporation
 hannstar	HannStar Display Corporation
 haoyu	Haoyu Microelectronic Co. Ltd.
+himax	Himax Technologies, Inc.
 hisilicon	Hisilicon Limited.
 hit	Hitachi Ltd.
 honeywell	Honeywell
···
 intel	Intel Corporation
 intercontrol	Inter Control Group
 isee	ISEE 2007 S.L.
-isil    Intersil (deprecated, use isl)
-isl	Intersil
+isil	Intersil
 karo	Ka-Ro electronics GmbH
 keymile	Keymile GmbH
 lacie	LaCie
···
 nxp	NXP Semiconductors
 onnn	ON Semiconductor Corp.
 opencores	OpenCores.org
+ovti	OmniVision Technologies
 panasonic	Panasonic Corporation
 pericom	Pericom Technology Inc.
 phytec	PHYTEC Messtechnik GmbH
···
 semtech	Semtech Corporation
 sil	Silicon Image
 silabs	Silicon Laboratories
+siliconmitus	Silicon Mitus, Inc.
 simtek
 sii	Seiko Instruments, Inc.
 silergy	Silergy Corp.
···
 toradex	Toradex AG
 toshiba	Toshiba Corporation
 toumaz	Toumaz
+truly	Truly Semiconductors Limited
 usi	Universal Scientific Industrial Co., Ltd.
 v3	V3 Semiconductor
 variscite	Variscite Ltd.

drivers/of/Kconfig

···
 config OF_UNITTEST
 	bool "Device Tree runtime unit tests"
 	depends on OF_IRQ && OF_EARLY_FLATTREE
-	select OF_DYNAMIC
 	select OF_RESOLVE
 	help
 	  This option builds in test cases for the device tree infrastructure

drivers/of/base.c

···
 	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(of_property_read_u64_array);
 
 /**
  * of_property_read_string - Find and read a string from a property

drivers/of/fdt.c

···
 #ifdef CONFIG_SERIAL_EARLYCON
 extern struct of_device_id __earlycon_of_table[];
 
-int __init early_init_dt_scan_chosen_serial(void)
+static int __init early_init_dt_scan_chosen_serial(void)
 {
 	int offset;
 	const char *p;

drivers/of/of_reserved_mem.c

···
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
 
 /**
  * of_reserved_mem_device_release() - release reserved memory device structures
···
 
 	rmem->ops->device_release(rmem, dev);
 }
+EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);

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

···
 					status = "disabled";
 					reg = <8>;
 				};
+
+				i2c-test-bus {
+					compatible = "selftest-i2c-bus";
+					status = "okay";
+					reg = <50>;
+
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					test-selftest12 {
+						reg = <8>;
+						compatible = "selftest-i2c-dev";
+						status = "disabled";
+					};
+
+					test-selftest13 {
+						reg = <9>;
+						compatible = "selftest-i2c-dev";
+						status = "okay";
+					};
+
+					test-selftest14 {
+						reg = <10>;
+						compatible = "selftest-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 = "selftest-i2c-dev";
+								status = "okay";
+							};
+						};
+					};
+				};
 			};
 		};
 
···
 				};
 			};
 		};
+
+		/* test enable using absolute target path (i2c) */
+		overlay12 {
+			fragment@0 {
+				target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-selftest12";
+				__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-selftest13";
+				__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-selftest15 {
+						reg = <11>;
+						compatible = "selftest-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 = "selftest-i2c-dev";
+								status = "okay";
+							};
+						};
+					};
+				};
+			};
+		};
+
 	};
 };

drivers/of/unittest.c

···
 #include <linux/platform_device.h>
 #include <linux/of_platform.h>
 
+#include <linux/i2c.h>
+#include <linux/i2c-mux.h>
+
 #include "of_private.h"
 
 static struct selftest_results {
 	int passed;
 	int failed;
 } selftest_results;
-
-#define NO_OF_NODES 3
-static struct device_node *nodes[NO_OF_NODES];
-static int last_node_index;
-static bool selftest_live_tree;
 
 #define selftest(result, fmt, ...) ({ \
 	bool failed = !(result); \
···
 static int attach_node_and_children(struct device_node *np)
 {
 	struct device_node *next, *dup, *child;
+	unsigned long flags;
 
 	dup = of_find_node_by_path(np->full_name);
 	if (dup) {
···
 		return 0;
 	}
 
-	/* Children of the root need to be remembered for removal */
-	if (np->parent == of_root) {
-		if (WARN_ON(last_node_index >= NO_OF_NODES))
-			return -EINVAL;
-		nodes[last_node_index++] = np;
-	}
-
 	child = np->child;
 	np->child = NULL;
-	np->sibling = NULL;
-	of_attach_node(np);
+
+	mutex_lock(&of_mutex);
+	raw_spin_lock_irqsave(&devtree_lock, flags);
+	np->sibling = np->parent->child;
+	np->parent->child = np;
+	of_node_clear_flag(np, OF_DETACHED);
+	raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
+	__of_attach_node_sysfs(np);
+	mutex_unlock(&of_mutex);
+
 	while (child) {
 		next = child->sibling;
 		attach_node_and_children(child);
···
 	}
 
 	if (!of_root) {
-		/* enabling flag for removing nodes */
-		selftest_live_tree = true;
 		of_root = selftest_data_node;
-
 		for_each_of_allnodes(np)
 			__of_attach_node_sysfs(np);
 		of_aliases = of_find_node_by_path("/aliases");
···
 		np = next;
 	}
 	return 0;
-}
-
-/**
- *	detach_node_and_children - detaches node
- *	and its children from live tree
- *
- *	@np:	Node to detach from live tree
- */
-static void detach_node_and_children(struct device_node *np)
-{
-	while (np->child)
-		detach_node_and_children(np->child);
-	of_detach_node(np);
-}
-
-/**
- *	selftest_data_remove - removes the selftest data
- *	nodes from the live tree
- */
-static void selftest_data_remove(void)
-{
-	struct device_node *np;
-	struct property *prop;
-
-	if (selftest_live_tree) {
-		of_node_put(of_aliases);
-		of_node_put(of_chosen);
-		of_aliases = NULL;
-		of_chosen = NULL;
-		for_each_child_of_node(of_root, np)
-			detach_node_and_children(np);
-		__of_detach_node_sysfs(of_root);
-		of_root = NULL;
-		return;
-	}
-
-	while (last_node_index-- > 0) {
-		if (nodes[last_node_index]) {
-			np = of_find_node_by_path(nodes[last_node_index]->full_name);
-			if (np == nodes[last_node_index]) {
-				if (of_aliases == np) {
-					of_node_put(of_aliases);
-					of_aliases = NULL;
-				}
-				detach_node_and_children(np);
-			} else {
-				for_each_property_of_node(np, prop) {
-					if (strcmp(prop->name, "testcase-alias") == 0)
-						of_remove_property(np, prop);
-				}
-			}
-		}
-	}
 }
 
 #ifdef CONFIG_OF_OVERLAY
···
 	return pdev != NULL;
 }
 
-static const char *selftest_path(int nr)
+#if IS_ENABLED(CONFIG_I2C)
+
+/* get the i2c client device instantiated at the path */
+static struct i2c_client *of_path_to_i2c_client(const char *path)
 {
+	struct device_node *np;
+	struct i2c_client *client;
+
+	np = of_find_node_by_path(path);
+	if (np == NULL)
+		return NULL;
+
+	client = of_find_i2c_device_by_node(np);
+	of_node_put(np);
+
+	return client;
+}
+
+/* find out if a i2c client device exists at that path */
+static int of_path_i2c_client_exists(const char *path)
+{
+	struct i2c_client *client;
+
+	client = of_path_to_i2c_client(path);
+	if (client)
+		put_device(&client->dev);
+	return client != NULL;
+}
+#else
+static int of_path_i2c_client_exists(const char *path)
+{
+	return 0;
+}
+#endif
+
+enum overlay_type {
+	PDEV_OVERLAY,
+	I2C_OVERLAY
+};
+
+static int of_path_device_type_exists(const char *path,
+		enum overlay_type ovtype)
+{
+	switch (ovtype) {
+	case PDEV_OVERLAY:
+		return of_path_platform_device_exists(path);
+	case I2C_OVERLAY:
+		return of_path_i2c_client_exists(path);
+	}
+	return 0;
+}
+
+static const char *selftest_path(int nr, enum overlay_type ovtype)
+{
+	const char *base;
 	static char buf[256];
 
-	snprintf(buf, sizeof(buf) - 1,
-		"/testcase-data/overlay-node/test-bus/test-selftest%d", nr);
+	switch (ovtype) {
+	case PDEV_OVERLAY:
+		base = "/testcase-data/overlay-node/test-bus";
+		break;
+	case I2C_OVERLAY:
+		base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
+		break;
+	default:
+		buf[0] = '\0';
+		return buf;
+	}
+	snprintf(buf, sizeof(buf) - 1, "%s/test-selftest%d", base, nr);
 	buf[sizeof(buf) - 1] = '\0';
-
 	return buf;
+}
+
+static int of_selftest_device_exists(int selftest_nr, enum overlay_type ovtype)
+{
+	const char *path;
+
+	path = selftest_path(selftest_nr, ovtype);
+
+	switch (ovtype) {
+	case PDEV_OVERLAY:
+		return of_path_platform_device_exists(path);
+	case I2C_OVERLAY:
+		return of_path_i2c_client_exists(path);
+	}
+	return 0;
 }
 
 static const char *overlay_path(int nr)
···
 
 /* apply an overlay while checking before and after states */
 static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
-		int before, int after)
+		int before, int after, enum overlay_type ovtype)
 {
 	int ret;
 
 	/* selftest device must not be in before state */
-	if (of_path_platform_device_exists(selftest_path(selftest_nr))
-			!= before) {
+	if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
 		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr),
+				selftest_path(selftest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
 	}
···
 	}
 
 	/* selftest device must be to set to after state */
-	if (of_path_platform_device_exists(selftest_path(selftest_nr))
-			!= after) {
+	if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
 		selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr),
+				selftest_path(selftest_nr, ovtype),
 				!after ? "enabled" : "disabled");
 		return -EINVAL;
 	}
···
 
 /* apply an overlay and then revert it while checking before, after states */
 static int of_selftest_apply_revert_overlay_check(int overlay_nr,
-		int selftest_nr, int before, int after)
+		int selftest_nr, int before, int after,
+		enum overlay_type ovtype)
 {
 	int ret, ov_id;
 
 	/* selftest device must be in before state */
-	if (of_path_platform_device_exists(selftest_path(selftest_nr))
-			!= before) {
+	if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
 		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr),
+				selftest_path(selftest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
 	}
···
 	}
 
 	/* selftest device must be in after state */
-	if (of_path_platform_device_exists(selftest_path(selftest_nr))
-			!= after) {
+	if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
 		selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr),
+				selftest_path(selftest_nr, ovtype),
 				!after ? "enabled" : "disabled");
 		return -EINVAL;
 	}
···
 	if (ret != 0) {
 		selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr));
+				selftest_path(selftest_nr, ovtype));
 		return ret;
 	}
 
 	/* selftest device must be again in before state */
-	if (of_path_platform_device_exists(selftest_path(selftest_nr))
-			!= before) {
+	if (of_selftest_device_exists(selftest_nr, PDEV_OVERLAY) != before) {
 		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
 				overlay_path(overlay_nr),
-				selftest_path(selftest_nr),
+				selftest_path(selftest_nr, ovtype),
 				!before ? "enabled" : "disabled");
 		return -EINVAL;
 	}
···
 	int ret;
 
 	/* device should enable */
-	ret = of_selftest_apply_overlay_check(0, 0, 0, 1);
+	ret = of_selftest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 	int ret;
 
 	/* device should disable */
-	ret = of_selftest_apply_overlay_check(1, 1, 1, 0);
+	ret = of_selftest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 	int ret;
 
 	/* device should enable */
-	ret = of_selftest_apply_overlay_check(2, 2, 0, 1);
+	ret = of_selftest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 	int ret;
 
 	/* device should disable */
-	ret = of_selftest_apply_overlay_check(3, 3, 1, 0);
+	ret = of_selftest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 	int ret;
 
 	/* device should disable */
-	ret = of_selftest_apply_overlay_check(4, 4, 0, 1);
+	ret = of_selftest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 	int ret;
 
 	/* device should disable */
-	ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1);
+	ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
 	if (ret != 0)
 		return;
 
···
 
 	/* selftest device must be in before state */
 	for (i = 0; i < 2; i++) {
-		if (of_path_platform_device_exists(
-					selftest_path(selftest_nr + i))
+		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
 				!= before) {
 			selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
 					overlay_path(overlay_nr + i),
-					selftest_path(selftest_nr + i),
+					selftest_path(selftest_nr + i,
+						PDEV_OVERLAY),
 					!before ? "enabled" : "disabled");
 			return;
 		}
···
 
 	for (i = 0; i < 2; i++) {
 		/* selftest device must be in after state */
-		if (of_path_platform_device_exists(
-					selftest_path(selftest_nr + i))
+		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
 				!= after) {
 			selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
 					overlay_path(overlay_nr + i),
-					selftest_path(selftest_nr + i),
+					selftest_path(selftest_nr + i,
+						PDEV_OVERLAY),
 					!after ? "enabled" : "disabled");
 			return;
 		}
···
 		if (ret != 0) {
 			selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
 					overlay_path(overlay_nr + i),
-					selftest_path(selftest_nr + i));
+					selftest_path(selftest_nr + i,
+						PDEV_OVERLAY));
 			return;
 		}
 	}
 
 	for (i = 0; i < 2; i++) {
 		/* selftest device must be again in before state */
-		if (of_path_platform_device_exists(
-					selftest_path(selftest_nr + i))
+		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
 				!= before) {
 			selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
 					overlay_path(overlay_nr + i),
-					selftest_path(selftest_nr + i),
+					selftest_path(selftest_nr + i,
+						PDEV_OVERLAY),
 					!before ? "enabled" : "disabled");
 			return;
 		}
···
 	if (ret == 0) {
 		selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
 				overlay_path(overlay_nr + 0),
-				selftest_path(selftest_nr));
+				selftest_path(selftest_nr,
+					PDEV_OVERLAY));
 		return;
 	}
 
···
 		if (ret != 0) {
 			selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
 					overlay_path(overlay_nr + i),
-					selftest_path(selftest_nr));
+					selftest_path(selftest_nr,
+						PDEV_OVERLAY));
 			return;
 		}
 	}
···
 	char *child_path;
 
 	/* device should disable */
-	ret = of_selftest_apply_overlay_check(10, 10, 0, 1);
-	if (selftest(ret == 0, "overlay test %d failed; overlay application\n", 10))
+	ret = of_selftest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
+	if (selftest(ret == 0,
+			"overlay test %d failed; overlay application\n", 10))
 		return;
 
 	child_path = kasprintf(GFP_KERNEL, "%s/test-selftest101",
-			selftest_path(10));
+			selftest_path(10, PDEV_OVERLAY));
 	if (selftest(child_path, "overlay test %d failed; kasprintf\n", 10))
 		return;
 
-	ret = of_path_platform_device_exists(child_path);
+	ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
 	kfree(child_path);
 	if (selftest(ret, "overlay test %d failed; no child device\n", 10))
 		return;
···
 	int ret;
 
 	/* device should disable */
-	ret = of_selftest_apply_revert_overlay_check(11, 11, 0, 1);
-	if (selftest(ret == 0, "overlay test %d failed; overlay application\n", 11))
+	ret = of_selftest_apply_revert_overlay_check(11, 11, 0, 1,
+			PDEV_OVERLAY);
+	if (selftest(ret == 0,
+			"overlay test %d failed; overlay application\n", 11))
 		return;
 }
+
+#if IS_ENABLED(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
+
+struct selftest_i2c_bus_data {
+	struct platform_device	*pdev;
+	struct i2c_adapter	adap;
+};
+
+static int selftest_i2c_master_xfer(struct i2c_adapter *adap,
+		struct i2c_msg *msgs, int num)
+{
+	struct selftest_i2c_bus_data *std = i2c_get_adapdata(adap);
+
+	(void)std;
+
+	return num;
+}
+
+static u32 selftest_i2c_functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm selftest_i2c_algo = {
+	.master_xfer	= selftest_i2c_master_xfer,
+	.functionality	= selftest_i2c_functionality,
+};
+
+static int selftest_i2c_bus_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct selftest_i2c_bus_data *std;
+	struct i2c_adapter *adap;
+	int ret;
+
+	if (np == NULL) {
+		dev_err(dev, "No OF data for device\n");
+		return -EINVAL;
+
+	}
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+
+	std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
+	if (!std) {
+		dev_err(dev, "Failed to allocate selftest i2c data\n");
+		return -ENOMEM;
+	}
+
+	/* link them together */
+	std->pdev = pdev;
+	platform_set_drvdata(pdev, std);
+
+	adap = &std->adap;
+	i2c_set_adapdata(adap, std);
+	adap->nr = -1;
+	strlcpy(adap->name, pdev->name, sizeof(adap->name));
+	adap->class = I2C_CLASS_DEPRECATED;
+	adap->algo = &selftest_i2c_algo;
+	adap->dev.parent = dev;
+	adap->dev.of_node = dev->of_node;
+	adap->timeout = 5 * HZ;
+	adap->retries = 3;
+
+	ret = i2c_add_numbered_adapter(adap);
+	if (ret != 0) {
+		dev_err(dev, "Failed to add I2C adapter\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int selftest_i2c_bus_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct selftest_i2c_bus_data *std = platform_get_drvdata(pdev);
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+	i2c_del_adapter(&std->adap);
+
+	return 0;
+}
+
+static struct of_device_id selftest_i2c_bus_match[] = {
+	{ .compatible = "selftest-i2c-bus", },
+	{},
+};
+
+static struct platform_driver selftest_i2c_bus_driver = {
+	.probe			= selftest_i2c_bus_probe,
+	.remove			= selftest_i2c_bus_remove,
+	.driver = {
+		.name		= "selftest-i2c-bus",
+		.of_match_table	= of_match_ptr(selftest_i2c_bus_match),
+	},
+};
+
+static int selftest_i2c_dev_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct device_node *np = client->dev.of_node;
+
+	if (!np) {
+		dev_err(dev, "No OF node\n");
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+
+	return 0;
+};
+
+static int selftest_i2c_dev_remove(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device_node *np = client->dev.of_node;
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+	return 0;
+}
+
+static const struct i2c_device_id selftest_i2c_dev_id[] = {
+	{ .name = "selftest-i2c-dev" },
+	{ }
+};
+
+static struct i2c_driver selftest_i2c_dev_driver = {
+	.driver = {
+		.name = "selftest-i2c-dev",
+		.owner = THIS_MODULE,
+	},
+	.probe = selftest_i2c_dev_probe,
+	.remove = selftest_i2c_dev_remove,
+	.id_table = selftest_i2c_dev_id,
+};
+
+#if IS_ENABLED(CONFIG_I2C_MUX)
+
+struct selftest_i2c_mux_data {
+	int nchans;
+	struct i2c_adapter *adap[];
+};
+
+static int selftest_i2c_mux_select_chan(struct i2c_adapter *adap,
+			       void *client, u32 chan)
+{
+	return 0;
+}
+
+static int selftest_i2c_mux_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	int ret, i, nchans, size;
+	struct device *dev = &client->dev;
+	struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
+	struct device_node *np = client->dev.of_node, *child;
+	struct selftest_i2c_mux_data *stm;
+	u32 reg, max_reg;
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+
+	if (!np) {
+		dev_err(dev, "No OF node\n");
+		return -EINVAL;
+	}
+
+	max_reg = (u32)-1;
+	for_each_child_of_node(np, child) {
+		ret = of_property_read_u32(child, "reg", &reg);
+		if (ret)
+			continue;
+		if (max_reg == (u32)-1 || reg > max_reg)
+			max_reg = reg;
+	}
+	nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
+	if (nchans == 0) {
+		dev_err(dev, "No channels\n");
+		return -EINVAL;
+	}
+
+	size = offsetof(struct selftest_i2c_mux_data, adap[nchans]);
+	stm = devm_kzalloc(dev, size, GFP_KERNEL);
+	if (!stm) {
+		dev_err(dev, "Out of memory\n");
+		return -ENOMEM;
+	}
+	stm->nchans = nchans;
+	for (i = 0; i < nchans; i++) {
+		stm->adap[i] = i2c_add_mux_adapter(adap, dev, client,
+				0, i, 0, selftest_i2c_mux_select_chan, NULL);
+		if (!stm->adap[i]) {
+			dev_err(dev, "Failed to register mux #%d\n", i);
+			for (i--; i >= 0; i--)
+				i2c_del_mux_adapter(stm->adap[i]);
+			return -ENODEV;
+		}
+	}
+
+	i2c_set_clientdata(client, stm);
+
+	return 0;
+};
+
+static int selftest_i2c_mux_remove(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device_node *np = client->dev.of_node;
+	struct selftest_i2c_mux_data *stm = i2c_get_clientdata(client);
+	int i;
+
+	dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
+	for (i = stm->nchans - 1; i >= 0; i--)
+		i2c_del_mux_adapter(stm->adap[i]);
+	return 0;
+}
+
+static const struct i2c_device_id selftest_i2c_mux_id[] = {
+	{ .name = "selftest-i2c-mux" },
+	{ }
+};
+
+static struct i2c_driver selftest_i2c_mux_driver = {
+	.driver = {
+		.name = "selftest-i2c-mux",
+		.owner = THIS_MODULE,
+	},
+	.probe = selftest_i2c_mux_probe,
+	.remove = selftest_i2c_mux_remove,
+	.id_table = selftest_i2c_mux_id,
+};
+
+#endif
+
+static int of_selftest_overlay_i2c_init(void)
+{
+	int ret;
+
+	ret = i2c_add_driver(&selftest_i2c_dev_driver);
+	if (selftest(ret == 0,
+			"could not register selftest i2c device driver\n"))
+		return ret;
+
+	ret = platform_driver_register(&selftest_i2c_bus_driver);
+	if (selftest(ret == 0,
+			"could not register selftest i2c bus driver\n"))
+		return ret;
+
+#if IS_ENABLED(CONFIG_I2C_MUX)
+	ret = i2c_add_driver(&selftest_i2c_mux_driver);
+	if (selftest(ret == 0,
+			"could not register selftest i2c mux driver\n"))
+		return ret;
+#endif
+
+	return 0;
+}
+
+static void of_selftest_overlay_i2c_cleanup(void)
+{
+#if IS_ENABLED(CONFIG_I2C_MUX)
+	i2c_del_driver(&selftest_i2c_mux_driver);
+#endif
+	platform_driver_unregister(&selftest_i2c_bus_driver);
+	i2c_del_driver(&selftest_i2c_dev_driver);
+}
+
+static void of_selftest_overlay_i2c_12(void)
+{
+	int ret;
+
+	/* device should enable */
+	ret = of_selftest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
+	if (ret != 0)
+		return;
+
+	selftest(1, "overlay test %d passed\n", 12);
+}
+
+/* test deactivation of device */
+static void of_selftest_overlay_i2c_13(void)
+{
+	int ret;
+
+	/* device should disable */
+	ret = of_selftest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
+	if (ret != 0)
+		return;
+
+	selftest(1, "overlay test %d passed\n", 13);
+}
+
+/* just check for i2c mux existence */
+static void of_selftest_overlay_i2c_14(void)
+{
+}
+
+static void of_selftest_overlay_i2c_15(void)
+{
+	int ret;
+
+	/* device should enable */
+	ret = of_selftest_apply_overlay_check(16, 15, 0, 1, I2C_OVERLAY);
+	if (ret != 0)
+		return;
+
+	selftest(1, "overlay test %d passed\n", 15);
+}
+
+#else
+
+static inline void of_selftest_overlay_i2c_14(void) { }
+static inline void of_selftest_overlay_i2c_15(void) { }
+
+#endif
 
 static void __init of_selftest_overlay(void)
 {
···
 		goto out;
 	}
 
-	if (!of_path_platform_device_exists(selftest_path(100))) {
+	if (!of_selftest_device_exists(100, PDEV_OVERLAY)) {
 		selftest(0, "could not find selftest0 @ \"%s\"\n",
-				selftest_path(100));
+				selftest_path(100, PDEV_OVERLAY));
 		goto out;
 	}
 
-	if (of_path_platform_device_exists(selftest_path(101))) {
+	if (of_selftest_device_exists(101, PDEV_OVERLAY)) {
 		selftest(0, "selftest1 @ \"%s\" should not exist\n",
-				selftest_path(101));
+				selftest_path(101, PDEV_OVERLAY));
 		goto out;
 	}
 
···
 
 	of_selftest_overlay_10();
 	of_selftest_overlay_11();
+
+#if IS_ENABLED(CONFIG_I2C)
+	if (selftest(of_selftest_overlay_i2c_init() == 0, "i2c init failed\n"))
+		goto out;
+
+	of_selftest_overlay_i2c_12();
+	of_selftest_overlay_i2c_13();
+	of_selftest_overlay_i2c_14();
+	of_selftest_overlay_i2c_15();
+
+	of_selftest_overlay_i2c_cleanup();
+#endif
 
 out:
 	of_node_put(bus_np);
···
 	of_selftest_match_node();
 	of_selftest_platform_populate();
 	of_selftest_overlay();
-
-	/* removing selftest data from live tree */
-	selftest_data_remove();
 
 	/* Double check linkage after removing testcase data */
 	of_selftest_check_tree_linkage();

include/linux/mod_devicetable.h

···
 /*
  * Struct used for matching a device
  */
-struct of_device_id
-{
+struct of_device_id {
 	char	name[32];
 	char	type[32];
 	char	compatible[128];