PCF8574 I2C configuration for 14.0-CURRENT on a RPi2B

Greetings,

My RPi2B GPIO header connects to a PCF8574 I2C adapter with these pins:

    RPi2B           PCF8574
---------------     -------
Pin  2 - +5VDC  <-> VCC
Pin  3 - GPIO 2 <-> SDA
Pin  5 - GPIO 3 <-> SCL
Pin 39 - Gnd    <-> GND

/boot/loader.conf contains these lines:

root@generic:/boot # cat /boot/loader.conf
# Configure USB OTG; see usb_template(4).
hw.usb.template=3
umodem_load="YES"
# Disable the beastie menu and color
beastie_disable="YES"
loader_color="NO"
gpioiic_load="YES"

and /boot/msdos/config.txt looks like this:

root@generic:/boot # cat /boot/msdos/config.txt
init_uart_clock=3000000
enable_uart=1
kernel=u-boot.bin
kernel7=u-boot.bin
dtoverlay=mmc
/ {
  gpioiic0 {
    compatible = "i2c-gpio";
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_gpioiic0>;
    scl-gpios = <&gpio2  3 GPIO_ACTIVE_HIGH>;
    sda-gpios = <&gpio3  5 GPIO_ACTIVE_HIGH>;
    status = "okay";
  };
};

Nothing happens:

root@generic:/boot # i2c -sv
dev: /dev/iic0, addr: 0x0, r/w: r, offset: 0x00, width: 8, count: 1
Error opening I2C controller (/dev/iic0): No such file or directory

What's missing? Thank you in advance.

Danke,

-- 
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.