Unable to setup on mt7621

[eMKa94]

I'm trying to set it up on the evb with mt7621 som.

My basic setup is:

OpenWRT 23.05.2 (kernel 5.17.137)

Target System :: MediaTek Ralink MIPS
Subtarget :: MT7621 based boards
Target Profile :: HiLink HLK-7621A evaluation board

Using WM8960 Aduio module from WaveShare connected to the MT7621 as follows:

On the left : WM8960, On the right : MT7621
I2C_SDA <----> (97) I2C SDA
I2C SCL <---> (96) I2C SCLK
I2S CLK <---> (9) CTS3_N
I2S LRCLK <---> (12) TXD3
I2S DAC <---> (16) RTS3N
I2S ADC <---> (13) RXD3

Not sure if the connections are ok... I've got a preconfigured HW...

The issues:

1. Simply cloning the repo to the package/kernel doesn't make the sound module visible under kernel_modules -> sound support

I had to cut out those two lines from the Makefile
+(TARGET_ramips_mt7621||TARGET_ramips_mt76x8):kmod-i2c-mt7628
+!(TARGET_ramips_mt7621||TARGET_ramips_mt76x8):kmod-i2c-ralink \

Modified the dts file as in example:
&i2c {
status = "okay";

codec: wm8960@1a {
	compatible = "wlf,wm8960";
	reg = <0x1a>;
	wlf,shared-lrclk;
	wlf,hp-cfg = <0 0 0>;
	wlf,gpio-cfg = <0 0>;
};

};

&i2s {
status = "okay";
};

/ {
sound {
compatible = "mediatek,mt762x-wm8960-machine";
mediatek,platform = <&i2s>;
mediatek,audio-codec = <&codec>;
audio-routing =
"Headphone", "HP_L",
"Headphone", "HP_R",
"Speaker", "SPK_LN",
"Speaker", "SPK_LP",
"Speaker", "SPK_RN",
"Speaker", "SPK_RP",
"Microphone", "MICB",
"LINPUT1", "Microphone",
"LINPUT2", "Line In",
"RINPUT2", "Line In";
};
};

I also enabled the WM8960 codec and Alsa support through kernel_menuconfig...

The codec is correctly loaded (probing on I2C is OK) but the alsa is not able to detect any sound card....

What am I doing wrong? I'm quite newby to openWRT ;)