1* STMicroelectronics SAS. ST21NFCA NFC Controller 2 3Required properties: 4- compatible: Should be "st,st21nfca-i2c". 5- clock-frequency: I²C work frequency. 6- reg: address on the bus 7- enable-gpios: Output GPIO pin used for enabling/disabling the ST21NFCA 8 9Optional SoC Specific Properties: 10- pinctrl-names: Contains only one value - "default". 11- pintctrl-0: Specifies the pin control groups used for this controller. 12- ese-present: Specifies that an ese is physically connected to the nfc 13controller. 14- uicc-present: Specifies that the uicc swp signal can be physically 15connected to the nfc controller. 16 17Example (for ARM-based BeagleBoard xM with ST21NFCA on I2C2): 18 19&i2c2 { 20 21 22 st21nfca: st21nfca@1 { 23 24 compatible = "st,st21nfca-i2c"; 25 26 reg = <0x01>; 27 clock-frequency = <400000>; 28 29 interrupt-parent = <&gpio5>; 30 interrupts = <2 IRQ_TYPE_LEVEL_LOW>; 31 32 enable-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>; 33 34 ese-present; 35 uicc-present; 36 }; 37}; 38