CHIP-linux-libre/Documentation/devicetree/bindings/net/nfc/st-nci.txt

* STMicroelectronics SAS. ST NCI NFC Controller

Required properties:
- compatible: Should be "st,st21nfcb-i2c" or "st,st21nfcc-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
- 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 I2C2):

&i2c2 {

	status = "okay";

	st21nfcb: st21nfcb@8 {

		compatible = "st,st21nfcb-i2c";

		reg = <0x08>;
		clock-frequency = <400000>;

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

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