dt-bindings: net: nfc: nxp,pn544: Convert txt bindings to yaml

Convert bindings for NXP PN544 NFC driver to YAML syntax.
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211017160210.85543-1-david@ixit.czSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/net/nfc/nxp,pn544.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/nfc/nxp,pn544.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP Semiconductors PN544 NFC Controller
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+properties:
+  compatible:
+    const: nxp,pn544-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  enable-gpios:
+    description: Output GPIO pin used for enabling/disabling the PN544
+    maxItems: 1
+
+  firmware-gpios:
+    description: Output GPIO pin used to enter firmware download mode
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - enable-gpios
+  - firmware-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        nfc@28 {
+            compatible = "nxp,pn544-i2c";
+            reg = <0x28>;
+
+            interrupt-parent = <&gpio1>;
+            interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
+
+            enable-gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
+            firmware-gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>;
+        };
+    };

Documentation/devicetree/bindings/net/nfc/pn544.txt

-* NXP Semiconductors PN544 NFC Controller
-
-Required properties:
-- compatible: Should be "nxp,pn544-i2c".
-- clock-frequency: I²C work frequency.
-- reg: address on the bus
-- interrupts: GPIO interrupt to which the chip is connected
-- enable-gpios: Output GPIO pin used for enabling/disabling the PN544
-- firmware-gpios: Output GPIO pin used to enter firmware download mode
-
-Optional SoC Specific Properties:
-- pinctrl-names: Contains only one value - "default".
-- pintctrl-0: Specifies the pin control groups used for this controller.
-
-Example (for ARM-based BeagleBone with PN544 on I2C2):
-
-&i2c2 {
-
-
-	pn544: pn544@28 {
-
-		compatible = "nxp,pn544-i2c";
-
-		reg = <0x28>;
-		clock-frequency = <400000>;
-
-		interrupt-parent = <&gpio1>;
-		interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
-
-		enable-gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
-		firmware-gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>;
-	};
-};