trf7970a.txt

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    1 * Texas Instruments TRF7970A RFID/NFC/15693 Transceiver
    2 
    3 Required properties:
    4 - compatible: Should be "ti,trf7970a".
    5 - spi-max-frequency: Maximum SPI frequency (<= 2000000).
    6 - interrupts: A single interrupt specifier.
    7 - ti,enable-gpios: One or two GPIO entries used for 'EN' and 'EN2' pins on the
    8   TRF7970A. EN2 is optional.
    9 - vin-supply: Regulator for supply voltage to VIN pin
   10 
   11 Optional SoC Specific Properties:
   12 - pinctrl-names: Contains only one value - "default".
   13 - pintctrl-0: Specifies the pin control groups used for this controller.
   14 - autosuspend-delay: Specify autosuspend delay in milliseconds.
   15 - irq-status-read-quirk: Specify that the trf7970a being used has the
   16   "IRQ Status Read" erratum.
   17 - en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF"
   18   erratum.
   19 - vdd-io-supply: Regulator specifying voltage for vdd-io
   20 - clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz
   21 
   22 Example (for ARM-based BeagleBone with TRF7970A on SPI1):
   23 
   24 &spi1 {
   25 
   26         nfc@0 {
   27                 compatible = "ti,trf7970a";
   28                 reg = <0>;
   29                 pinctrl-names = "default";
   30                 pinctrl-0 = <&trf7970a_default>;
   31                 spi-max-frequency = <2000000>;
   32                 interrupt-parent = <&gpio2>;
   33                 interrupts = <14 0>;
   34                 ti,enable-gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>,
   35                                   <&gpio2 5 GPIO_ACTIVE_HIGH>;
   36                 vin-supply = <&ldo3_reg>;
   37                 vdd-io-supply = <&ldo2_reg>;
   38                 autosuspend-delay = <30000>;
   39                 irq-status-read-quirk;
   40                 en2-rf-quirk;
   41                 clock-frequency = <27120000>;
   42         };
   43 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/net/nfc/trf7970a.txt

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sys/contrib/device-tree/Bindings/net/nfc/trf7970a.txt