If you would go deeper inside the source code you must see in the source file and search around i2s0, sound ,snd, sunxi, codec
have a look at the source code for H6
Good luck 
Hi again
now set armbian and got -
no soundcards found…
used your old script -
/dts-v1/;
/plugin/;
/ {
compatible = “allwinner,sun50i-h616”;
fragment@0 {
target = <&pio>;
overlay {
ahub_daudio0_pins_a: ahub_daudio0@0 {
pins = “PI0”, “PI1”, “PI2”;
function = “i2s0”;
drive-strength = <0x14>;
bias-disable;
};
ahub_daudio0_pins_b: ahub_daudio0@1 {
pins = “PI3”;
function = “i2s0_dout0”;
drive-strength = <0x14>;
bias-disable;
};
ahub_daudio0_pins_c: ahub_daudio0@2 {
pins = “PI4”;
function = “i2s0_din0”;
drive-strength = <0x14>;
bias-disable;
};
ahub_daudio0_pins_d: ahub_daudio0_sleep {
pins = “PI0”, “PI1”, “PI2”, “PI3”, “PI4”;
function = “gpio_in”;
drive-strength = <0x14>;
bias-disable;
};
};
};
fragment@1 {
target-path = “/soc”;
overlay {
ahub0_plat: ahub0_plat {
#sound-dai-cells = <0>;
compatible = “allwinner,sunxi-snd-plat-ahub”;
apb_num = <0>; /* for dma port 3 */
dmas = <&dma 3>, <&dma 3>;
dma-names = “tx”, “rx”;
playback_cma = <128>;
capture_cma = <128>;
tx_fifo_size = <128>;
rx_fifo_size = <128>;
pinctrl-names = "default", "sleep";
pinctrl_used;
pinctrl-0 = <&ahub_daudio0_pins_a>, <&ahub_daudio0_pins_b>, <&ahub_daudio0_pins_c>;
pinctrl-1 = <&ahub_daudio0_pins_d>;
status = "okay";
};
ahub0_mach: ahub0_mach {
compatible = "allwinner,sunxi-snd-mach";
soundcard-mach,name = "ahubi2s0";
soundcard-mach,format = "i2s";
status = "okay";
soundcard-mach,cpu {
sound-dai = <&ahub0_plat>;
};
soundcard-mach,codec {
};
};
};
};
};
Hello rx9cim
My script is here for the whole version with the command to create it and applied
in fact i don’t know if it works with armbian