1* Texas Instruments TRF7970A RFID/NFC/15693 Transceiver 2 3Required properties: 4- compatible: Should be "ti,trf7970a". 5- spi-max-frequency: Maximum SPI frequency (<= 2000000). 6- interrupt-parent: phandle of parent interrupt handler. 7- interrupts: A single interrupt specifier. 8- ti,enable-gpios: Two GPIO entries used for 'EN' and 'EN2' pins on the 9 TRF7970A. 10- vin-supply: Regulator for supply voltage to VIN pin 11 12Optional SoC Specific Properties: 13- pinctrl-names: Contains only one value - "default". 14- pintctrl-0: Specifies the pin control groups used for this controller. 15- autosuspend-delay: Specify autosuspend delay in milliseconds. 16- vin-voltage-override: Specify voltage of VIN pin in microvolts. 17- irq-status-read-quirk: Specify that the trf7970a being used has the 18 "IRQ Status Read" erratum. 19- en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF" 20 erratum. 21- t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum 22 where an extra byte is returned by Read Multiple Block commands issued 23 to Type 5 tags. 24 25Example (for ARM-based BeagleBone with TRF7970A on SPI1): 26 27&spi1 { 28 status = "okay"; 29 30 nfc@0 { 31 compatible = "ti,trf7970a"; 32 reg = <0>; 33 pinctrl-names = "default"; 34 pinctrl-0 = <&trf7970a_default>; 35 spi-max-frequency = <2000000>; 36 interrupt-parent = <&gpio2>; 37 interrupts = <14 0>; 38 ti,enable-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>, 39 <&gpio2 5 GPIO_ACTIVE_LOW>; 40 vin-supply = <&ldo3_reg>; 41 vin-voltage-override = <5000000>; 42 autosuspend-delay = <30000>; 43 irq-status-read-quirk; 44 en2-rf-quirk; 45 t5t-rmb-extra-byte-quirk; 46 status = "okay"; 47 }; 48}; 49