enable i2c3 adding device tree definition: create dts file add add to boot
sun50i-h616-i2c3.dts
/dts-v1/; /plugin/; / { compatible = "allwinner,sun50i-h6"; fragment@0 { target-path = "/aliases"; __overlay__ { i2c3 = "/soc/i2c@5002c00"; }; }; fragment@1 { target = <&i2c3>; __overlay__ { pinctrl-names = "default"; pinctrl-0 = <&i2c3_ph_pins>; status = "okay"; }; }; };
armbian-add-overlay sun50i-h616-i2c3.dts