dt-bindings: i2c: owl: Convert Actions Semi Owl binding to a schema

Convert the Actions Semi Owl I2C DT binding to a YAML schema for
enabling DT validation.

Additionally, add a new compatible string corresponding to the I2C
controller found in the S500 variant of the Actions Semi Owl SoCs
family.
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

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

-Actions Semiconductor Owl I2C controller
-
-Required properties:
-
-- compatible        : Should be one of the following:
-		      - "actions,s700-i2c" for S700 SoC
-		      - "actions,s900-i2c" for S900 SoC
-- reg               : Offset and length of the register set for the device.
-- #address-cells    : Should be 1.
-- #size-cells       : Should be 0.
-- interrupts        : A single interrupt specifier.
-- clocks            : Phandle of the clock feeding the I2C controller.
-
-Optional properties:
-
-- clock-frequency   : Desired I2C bus clock frequency in Hz. As only Normal and
-                      Fast modes are supported, possible values are 100000 and
-                      400000.
-Examples:
-
-        i2c0: i2c@e0170000 {
-                compatible = "actions,s900-i2c";
-                reg = <0 0xe0170000 0 0x1000>;
-                #address-cells = <1>;
-                #size-cells = <0>;
-                interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
-                clocks = <&clock CLK_I2C0>;
-                clock-frequency = <100000>;
-        };

Documentation/devicetree/bindings/i2c/i2c-owl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-owl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Actions Semi Owl I2C Controller
+
+maintainers:
+  - Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+description: |
+  This I2C controller is found in the Actions Semi Owl SoCs:
+  S500, S700 and S900.
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - actions,s500-i2c # Actions Semi S500 compatible SoCs
+      - actions,s700-i2c # Actions Semi S700 compatible SoCs
+      - actions,s900-i2c # Actions Semi S900 compatible SoCs
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: Phandle of the clock feeding the I2C controller.
+    minItems: 1
+
+  clock-frequency:
+    description: |
+      Desired I2C bus clock frequency in Hz. As only Standard and Fast
+      modes are supported, possible values are 100000 and 400000.
+    enum: [100000, 400000]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/actions,s900-cmu.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    i2c@e0170000 {
+        compatible = "actions,s900-i2c";
+        reg = <0xe0170000 0x1000>;
+        interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&cmu CLK_I2C0>;
+        clock-frequency = <100000>;
+    };
+
+...

MAINTAINERS

@@ -1501,7 +1501,7 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/arm/actions.yaml
 F:	Documentation/devicetree/bindings/clock/actions,owl-cmu.txt
 F:	Documentation/devicetree/bindings/dma/owl-dma.yaml
-F:	Documentation/devicetree/bindings/i2c/i2c-owl.txt
+F:	Documentation/devicetree/bindings/i2c/i2c-owl.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.yaml
 F:	Documentation/devicetree/bindings/mmc/owl-mmc.yaml
 F:	Documentation/devicetree/bindings/pinctrl/actions,*