Kernel-4.18.0-80.el8_st21nfca

• STMicroelectronics SAS. ST21NFCA NFC Controller

Required properties:

• compatible: Should be “st,st21nfca-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
• enable-gpios: Output GPIO pin used for enabling/disabling the ST21NFCA

Optional SoC Specific Properties:

• pinctrl-names: Contains only one value - “default”.
• pintctrl-0: Specifies the pin control groups used for this controller.
• ese-present: Specifies that an ese is physically connected to the nfc
  controller.
• uicc-present: Specifies that the uicc swp signal can be physically
  connected to the nfc controller.

Example (for ARM-based BeagleBoard xM with ST21NFCA on I2C2):

&i2c2 {

st21nfca: st21nfca@1 {

    compatible = "st,st21nfca-i2c";

    reg = <0x01>;
    clock-frequency = <400000>;

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

    enable-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;

    ese-present;
    uicc-present;
};

};