PCMD3140: How to configure Voice Activity Detection (VAD) on PCMD3140IRTER in Linux

I have a four-channel PDM-input codec, the PCMD3140IRTER, and I would like to enable Voice Activity Detection (VAD). I noticed that in the driver section of your website, the driver doesn’t seem to support it: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/sound/soc/codecs/tlv320adcx140.c

Reading through the datasheet, it references this document:
www.ti.com/.../sbaa490a.pdf
From which I tried to take inspiration to add VAD functionality to the driver, starting from Example 2 on page 10:

w 9C 00 00 # Go to Page 0
w 9C 02 81 # Wake-up device by I2C write into P0_R2, exit Sleep mode
d 10 # Wait 16 ms
w 9c 00 00 # go to page 9
w 9c 50 00 72 59 dc # -7dB threshold
w 9C 00 00 # Go to Page 0
w 9c 3c 40 # Ch1 configured as Digital microphone PDM input
w 9c 41 40 # Ch2 configured as Digital microphone PDM input
w 9c 73 C0 # Input channels 1 and 2 enabled
w 9c 74 C0 # ASI output channels 1 and 2 enabled
w 9c 21 21 # GPIO1 as IRQ
w 9c 22 41 # GPO1 as PDM CLK
w 9c 2b 45 # GPI1 as Ch1/2 DMIC data
w 9c 20 00 # GPI1 negative edge as Ch1
w 9c 00 01 # go to page 1
w 9c 1e 00 # Channel 1 as VAD input, user mode, internal clock
w 9c 1f 00 # VAD disabled in recording mode
w 9c 00 00 # go to page 0
w 9c 75 21 # Enable VAD

However, I noticed an inconsistency: the script says to go to page 9, but in the datasheet I cannot find any user-accessible registers on page 9, and there is an error in the command w 9c 00 00 # go to page 9 (00 != 09). I tried on both pages 9 and 0, but in both cases I don’t get the desired result.

Even after using an oscilloscope and adding these commands to the driver, I don’t see any interrupt activity on GPIO1, even though I’ve included the following in the device tree:

pcmd3140_codec: pcmd3140_codec@4e {
    compatible = "ti,tlv320adc3140";
    reg = <0x4e>;
    ti,pdm-edge-select = <1 1 1 1>;
    ti,gpi-config = <4 5 0 0>;
    ti,gpio-config = <2 1>;
    ti,gpo-config-1 = <4 1>;
    
    pcmd3140_port: port {
        #address-cells = <1>;
        #size-cells = <0>;

        pcmd3140_tx_endpoint: endpoint@0 {
            reg = <0>;
            remote-endpoint = <&sai1a_endpoint>;
        };
    };
};

Even when bypassing the driver and manually issuing the commands using the i2cset tool, I get the same result:

i2cset -y 0 0x4e 0x00 0x00 # Go to Page 0
i2cset -y 0 0x4e 0x02 0x81 # Wake-up device
sleep 0.016 # Wait 16 ms
i2cset -y 0 0x4e 0x00 0x09 # Go to Page 9 (corrected from 0x00) 
i2cset -y 0 0x4e 0x50 0x00 0x72 0x59 0xDC i # -7dB threshold
i2cset -y 0 0x4e 0x00 0x00 # Go to Page 0
i2cset -y 0 0x4e 0x3C 0x40 # Ch1 configured as Digital microphone PDM input
i2cset -y 0 0x4e 0x41 0x40 # Ch2 configured as Digital microphone PDM input
i2cset -y 0 0x4e 0x73 0xC0 # Input channels 1 and 2 enabled
i2cset -y 0 0x4e 0x74 0xC0 # ASI output channels 1 and 2 enabled
i2cset -y 0 0x4e 0x21 0x21 # GPIO1 as IRQ
i2cset -y 0 0x4e 0x22 0x41 # GPO1 as PDM CLK
i2cset -y 0 0x4e 0x2B 0x45 # GPI1 as Ch1/2 DMIC data
i2cset -y 0 0x4e 0x20 0x00 # GPI1 negative edge as Ch1
i2cset -y 0 0x4e 0x00 0x01 # Go to Page 1
i2cset -y 0 0x4e 0x1E 0x00 # Channel 1 as VAD input, user mode, internal clock
i2cset -y 0 0x4e 0x1F 0x00 # VAD disabled in recording mode
i2cset -y 0 0x4e 0x00 0x00 # Go to Page 0
i2cset -y 0 0x4e 0x75 0x21 # Enable VAD

Could you please provide any guidance or share a driver implementation that already includes VAD support?

Thanks in advance.