* STMicroelectronics SAS. ST NCI NFC Controller

Required properties:
- compatible: Should be "st,st21nfcb-spi"
- spi-max-frequency: Maximum SPI frequency (<= 10000000).
- interrupt-parent: phandle for the interrupt gpio controller
- interrupts: GPIO interrupt to which the chip is connected
- reset-gpios: Output GPIO pin used to reset the ST21NFCB

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 BeagleBoard xM with ST21NFCB on SPI4):

&mcspi4 {

	status = "okay";

	st21nfcb: st21nfcb@0 {

		compatible = "st,st21nfcb-spi";

		clock-frequency = <4000000>;

		interrupt-parent = <&gpio5>;
		interrupts = <2 IRQ_TYPE_EDGE_RISING>;

		reset-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;
	};
};