* NXP Semiconductors PN544 NFC Controller

Required properties:
- compatible: Should be "nxp,pn544-i2c".
- clock-frequency: I²C work frequency.
- reg: address on the bus
- interrupt-parent: phandle for the interrupt gpio controller
- 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 {

	status = "okay";

	pn544: pn544@28 {

		compatible = "nxp,pn544-i2c";

		reg = <0x28>;
		clock-frequency = <400000>;

		interrupt-parent = <&gpio1>;
		interrupts = <17 GPIO_ACTIVE_HIGH>;

		enable-gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
		firmware-gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>;
	};
};