of: unitest: Add I2C overlay unit tests.

Introduce I2C device tree overlay tests.
Tests insertion and removal of i2c adapters, i2c devices, and muxes.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 58 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/unittest.txt b/Documentation/devicetree/bindings/unittest.txt
index 0f92a22fddfa..8933211f32f9 100644
--- a/Documentation/devicetree/bindings/unittest.txt
+++ b/Documentation/devicetree/bindings/unittest.txt
@@ -1,4 +1,4 @@
-* OF selftest platform device
+1) OF selftest platform device
 
 ** selftest
 
@@ -12,3 +12,60 @@ Example:
 		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";
+			};
+		};
+	};