dt-bindings: i2c: meson: convert to yaml

Now that we have the DT validation in place, let's convert the device tree
bindings for the Amlogic I2C Controller over to YAML schemas.

Signed-off-by: Neil Armstrong <[e-mail]>
Acked-by: Beniamino Galvani <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

Documentation/devicetree/bindings/i2c/amlogic,meson6-i2c.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019 BayLibre, SAS
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/i2c/amlogic,meson6-i2c.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Amlogic Meson I2C Controller
+
+maintainers:
+  - Neil Armstrong <[e-mail]>
+  - Beniamino Galvani <[e-mail]>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - amlogic,meson6-i2c # Meson6, Meson8 and compatible SoCs
+      - amlogic,meson-gxbb-i2c # GXBB and compatible SoCs
+      - amlogic,meson-axg-i2c # AXG and compatible SoCs
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+examples:
+  - |
+    i2c@c8100500 {
+        compatible = "amlogic,meson6-i2c";
+        reg = <0xc8100500 0x20>;
+        interrupts = <92>;
+        clocks = <&clk81>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        eeprom@52 {
+            compatible = "atmel,24c32";
+            reg = <0x52>;
+        };
+    };

Documentation/devicetree/bindings/i2c/i2c-meson.txt

···
-Amlogic Meson I2C controller
-
-Required properties:
- - compatible: must be:
-	"amlogic,meson6-i2c" for Meson8 and compatible SoCs
-	"amlogic,meson-gxbb-i2c" for GXBB and compatible SoCs
-	"amlogic,meson-axg-i2c"for AXG and compatible SoCs
-
- - reg: physical address and length of the device registers
- - interrupts: a single interrupt specifier
- - clocks: clock for the device
- - #address-cells: should be <1>
- - #size-cells: should be <0>
-
-For details regarding the following core I2C bindings see also i2c.txt.
-
-Optional properties:
-- clock-frequency: the desired I2C bus clock frequency in Hz; in
-  absence of this property the default value is used (100 kHz).
-
-Examples:
-
-	i2c@c8100500 {
-		compatible = "amlogic,meson6-i2c";
-		reg = <0xc8100500 0x20>;
-		interrupts = <0 92 1>;
-		clocks = <&clk81>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-	};