dt-bindings: gpio: zynq: convert bindings to YAML

Convert gpio for Xilinx Zynq SoC bindings documentation to YAML.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Documentation/devicetree/bindings/gpio/gpio-zynq.txt

-Xilinx Zynq GPIO controller Device Tree Bindings
--------------------------------------------
-
-Required properties:
-- #gpio-cells 		: Should be two
-			  - First cell is the GPIO line number
-			  - Second cell is used to specify optional
-			    parameters (unused)
-- compatible		: Should be "xlnx,zynq-gpio-1.0" or
-			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
-			  or "xlnx,pmc-gpio-1.0
-- clocks		: Clock specifier (see clock bindings for details)
-- gpio-controller	: Marks the device node as a GPIO controller.
-- interrupts		: Interrupt specifier (see interrupt bindings for
-			  details)
-- interrupt-controller	: Marks the device node as an interrupt controller.
-- #interrupt-cells 	: Should be 2.  The first cell is the GPIO number.
-			  The second cell bits[3:0] is used to specify trigger type and level flags:
-			      1 = low-to-high edge triggered.
-			      2 = high-to-low edge triggered.
-			      4 = active high level-sensitive.
-			      8 = active low level-sensitive.
-- reg			: Address and length of the register set for the device
-
-Example:
-	gpio@e000a000 {
-		#gpio-cells = <2>;
-		compatible = "xlnx,zynq-gpio-1.0";
-		clocks = <&clkc 42>;
-		gpio-controller;
-		interrupt-parent = <&intc>;
-		interrupts = <0 20 4>;
-		interrupt-controller;
-		#interrupt-cells = <2>;
-		reg = <0xe000a000 0x1000>;
-	};

Documentation/devicetree/bindings/gpio/gpio-zynq.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/gpio-zynq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx Zynq GPIO controller Device Tree Bindings
+
+maintainers:
+  - Michal Simek <michal.simek@xilinx.com>
+
+properties:
+  compatible:
+    const: xlnx,zynq-gpio-1.0
+
+  reg:
+    maxItems: 1
+
+  "#gpio-cells":
+    const: 2
+
+  interrupts:
+    maxItems: 1
+
+  gpio-controller: true
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 2
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#gpio-cells"
+  - interrupts
+  - gpio-controller
+  - interrupt-controller
+  - "#interrupt-cells"
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    gpio@e000a000 {
+      #gpio-cells = <2>;
+      compatible = "xlnx,zynq-gpio-1.0";
+      clocks = <&clkc 42>;
+      gpio-controller;
+      interrupt-parent = <&intc>;
+      interrupts = <0 20 4>;
+      interrupt-controller;
+      #interrupt-cells = <2>;
+      reg = <0xe000a000 0x1000>;
+    };