dt-bindings: i2c: migrate mt7621 text bindings to YAML

SoC MT7621 I2C bindings used text format, so migrate them to YAML.
There are some additions to the binding that were not in the original
txt file. This binding is used in MT7621 and MT7628a Ralink SoCs. To
properly match both dts nodes in tree we need to add to the schema
'clocks', 'clock-names' and 'reset-names'. Both 'clock-names' and
'reset-names' use 'i2c' as string so maintain that as const in
the schema. Also, Properly update MAINTAINERS file to align the
changes.

Signed-off-by: Sergio Paracuellos <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/i2c/i2c-mt7621.txt

···
-MediaTek MT7621/MT7628 I2C master controller
-
-Required properties:
-
-- compatible: Should be one of the following:
-  - "mediatek,mt7621-i2c": for MT7621/MT7628/MT7688 platforms
-- #address-cells: should be 1.
-- #size-cells: should be 0.
-- reg: Address and length of the register set for the device
-- resets: phandle to the reset controller asserting this device in
-          reset
-  See ../reset/reset.txt for details.
-
-Optional properties :
-
-Example:
-
-i2c: i2c@900 {
-	compatible = "mediatek,mt7621-i2c";
-	reg = <0x900 0x100>;
-	#address-cells = <1>;
-	#size-cells = <0>;
-	resets = <&rstctrl 16>;
-	reset-names = "i2c";
-};

Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/mediatek,mt7621-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+maintainers:
+  - Stefan Roese <[e-mail]>
+
+title: Mediatek MT7621/MT7628 I2C master controller
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    const: mediatek,mt7621-i2c
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: i2c
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: i2c
+
+required:
+  - compatible
+  - reg
+  - resets
+  - "#address-cells"
+  - "#size-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt7621-clk.h>
+    #include <dt-bindings/reset/mt7621-reset.h>
+
+    i2c: i2c@900 {
+      compatible = "mediatek,mt7621-i2c";
+      reg = <0x900 0x100>;
+      clocks = <&sysc MT7621_CLK_I2C>;
+      clock-names = "i2c";
+      resets = <&sysc MT7621_RST_I2C>;
+      reset-names = "i2c";
+
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      pinctrl-names = "default";
+      pinctrl-0 = <&i2c_pins>;
+    };

MAINTAINERS

···
 M:	Stefan Roese <[e-mail]>
 L:	[e-mail]
 S:	Maintained
-F:	Documentation/devicetree/bindings/i2c/i2c-mt7621.txt
+F:	Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml
 F:	drivers/i2c/busses/i2c-mt7621.c
 
 MEDIATEK MT7621 PCIE CONTROLLER DRIVER